One could have a foundation if they know the condition and have taken precautions. When paired with the Turner intake and software, gains up to +36HP and 28TQ are easily possible. However, the N55 can still handle about 550-600whp with a proper setup. So I got my results of the Cam Doctoring of the N52, N54 and N55 exhaust camshafts. BMW is no stranger to the turbocharged engine. JavaScript is disabled. Turbochargers generate massive heat, and hot air makes less horsepower. Manufacturers will only go so far for a customer. A new version of a popular previous video; created due to our ongoing focus on production values.Ben details the steps Hack Engineering takes to safeguard th. Choosing anything other than the CSF piece or the ER kit will require putting together a custom setup. Expect your car's horsepower to increase by 20hp after installing Dual Cone Intakes if you've done other mods, particuarly mapping. Comparable to vw/audi factory tool t40058. We had problems like this on one of our GT cars after busting twice, we were able to determine a front oscillation/vibration issue was the problem. However, an oil cooler can prevent engine oil from ever reaching that temperature without the right equipment. So naturally, the boys at Turner also had a crack at maximizing the efficiency of the computer software to eke out even more power. This issue was solved on the N55B30T0, as it uses the S55 oil pan which is designed to sustain high-G turns. Well answer these questions and then some. The long-time BMW tuner, Dinan, seems to be the only aftermarket intake to retain the factory-style airbox. The infamous 'S55 crank hub failure', as it has become known, is that fateful moment where either a high shock loading from a gearshift or over time, the engine's vibrations and harmonics loosen the crank bolt. Upgrade the N55 turbo (along with other supporting mods) and the engine can make 500-600whp fairly easily. Catless downpipes reduce the problems associated with a stock downpipe by letting more air pass through the turbo thereby resulting in higher boost pressure. Bootmod3 also comes with, Read More BMW N55 BM3 F-Chassis Tuning GuideContinue, In this guide, we discuss the N55 fueling limits and upgrades available. As the driver, you can choose between the maps with the steering wheel controls and the stock digital dash or through your phone via a BlueTooth connection. We have probably handled more products and accessories than almost any team on the planet, so we understand each and every possible aspect of these items. Check these out to see just how in-depth we go to make them. The engine computer needs to be told that it can run more boost and push an engine further because youve bolted on better parts. The N55s stock oil cooler thermostat opens up right around 120c. You want to keep an eye on the engine parameters often. Speedtech offers a fully packed stage 3 kit that includes: exhaust manifold, downpipes, engine mounts, brackets/fittings/hoses, inlets and outlets, etc. Be sure to keep up with our latest YouTube content and subscribe. Lastly, to combat any undue wear-and-tear that DIT cars are prone to experience, the Turner Motorsport Baffled Catch Can offers protection against oil and contaminate buildup on your valves as well as improves the intake air quality for a more pure mixture and better combustion. Your email address will not be published. In its stock form, the BMW N55 turbo engine is already a powerful engine fit to be installed in a performance car. Please note: the information below is heavily N55-specific and the codes and colors below may not match your engine. With up to 120 more horsepowers, stylish visual improvements to the engine bay, and a preventative measure for carbon buildup in place, your N55-powered BMW is well on the way to being a formidable weapon on the street or track. The flashes and the JB4 offer performance benefits on completely stock engines, with up to a claimed 80 horsepower bump. Carbon build-up in the head, particularly around the valves which will sap power or create flat spots, this is a larger issue on direct injection engines but should be looked out for on all engines. Qty: Availability: Ships in 3 Business Days. BMW was not consistent on which codes correspond to specific colors. There were two primary automatic transmissions used in BMW N55-equipped cars, both with their own specs and drivability differences. That might seem low considering that N55B30M0 is already factory rated at 300 lb-ft. Some of our members have had issues with flat spots or glitches after applying mods and upgrades or tuning, this is not usually related to the design of this engine, so instead see our article on diagnosing flat spots and problems after tuning which should help you get the bottom of this issue. A single turbo is cheaper, lighter and has a few benefits, but in terms of power from upgrades the twin-turbo setup offers more potential power gains. Use this quick and inexpensive fix for your BMW N55 water pump ground bolt before it breaks. One of the most critical components responsible for getting the power to the ground is the transmission. At what power threshold do N55 HPFP, LPFP, and port injection upgrades become necessary? Drop a comment and let us know! Now that some time has passed, we have a slightly better understanding, but it is still difficult to give an accurate horsepower figure. S55/N55 Crank Hub Upgrade. Collection of best products! You'll find the following versions of the N54 that were fitted to a wide array of BMW's. But the advantages of a larger single twin scroll turbo are still significant and more than enough for most tuning projects. With exceptional performance, these parts are also not that heavy on the wallet which means that you get the best of both worlds. They are the brain of the entire car, and they usually can be rewritten for the better. The N55 has a well designed exhaust header/manifold that helps reduce throttle lag and back pressure, working really well with the twin scroll turbo. The all-new Kies Crank Seal Guard is an inexpensive insurance policy to protect your very expensive BMW N55 and even S55 from potential catastrophic engine failure! Required fields are marked *. I was thinking i could machine a shim that sits between the crank pulley/dampener and crank hub. Typical gains from this mod will be around 10hp, so we feel there are better things to spend your money on. It may not display this or other websites correctly. To make the search for power a bit easier, check out this guide to boosting the performance of your boosted BMW engine. Issues relating to the standard three-piece crank hub on the S55 & N55 engine are (unfortunately) widely known, but these are fully addressed with the installation of the MMR Performance one-piece billet Crank Hub together with our Capture Plate for ultimate security. Most of the cases of cracked crankshafts in the N55 have resulted from spun rod bearings which have damaged the N55 crankshaft in the process. ***********.com/threads/ge-2?view=date, Recommend this as a feature on the BimmerPost Homepage. I love your site and articles! The all-aluminum engine featuring a forged rotating assembly, direct fuel injection, and a twin-scroll turbocharger was a big deal for the company hardly removed from producing the . You will also have full access to I didn't find too much except the one post.. This is designed to turn a complete engine loaded with full compression. Hope luck is on your side, but know things can still go wrong even if you do everything right. BMW N55 Engine Rebuild Tools: https://amzn.to/3uHUwh5 Parts: https://amzn.to/37W6GsSPart 3: https://youtu.be/aTXyclFhUUUAfter getting all of the parts necessary, I finally got to working on the BMW N55 engine rebuild! Those are a few known issues that are pretty common with age and mileage. Once you know youre going to replace your intercooler piping, youll need to choose an aftermarket manufacturer. Please watch our video which covers 11 of the best N55 Mods & Upgrades. However, there are some gems out there that won't break the bank. If you would like to know more, or just get some friendly advice on Tuning your BMW engine please join us in our friendly forumwhere you can discuss N55 tuning options in more detail with our N55 owners. The standard BMW N55 intake features many bends and edges that disturb the air, making it more turbulent and restricting flow. Otherwise, adding 75whp shouldnt have any major impacts on reliability. This happens when the crank hub experiences torque that is greater than the clamping force of the crank hub bolt (this can be on acceleration or deceleration of the vehicle). Prevent your sepentine belt from being sucked into your engine! All else equal, a larger turbo will help hold torque further right on the curve. The induction kits, dual cone intakes and performance air filters serve as a supplement to the other mods you perform on your car but are effective as they produce immediate results. 908 DONATA COURT That will probably be noticeable if you enjoy pushing the car through the canyons/twisty roads. Calculate MPG The VRSF charge pipe is incredibly popular but Vargas Turbo Technologies, Burger Motorsports, Masata, and RK Tunes all offer slightly different takes on the intercooler piping made from aluminum. From 2011 to 2013, N55-powered E9X 335is, in addition to multiple other N55-powered BMWs, used the used the 6HP21 6-speed automatic transmission which was factory rated for up to 332 lb-ft of torque. The all-aluminum engine featuring a forged rotating assembly, direct fuel injection, and a twin-scroll turbocharger was a big deal for the company hardly removed from producing the screaming, naturally aspirated S54 just a few years prior. I have a N55 crank for sale if you want to go that route. It was available in just about every chassis BMW used during its life, including the F01 7-series, F16 X6, and the F87 M2. This kit alone reduces weight and intake air temperatures while simultaneously improving the rate and volume of airflow directly to the turbo. The turbocharger outlet is a massive 4, and the stock downpipe reduces that at its outlet to the stock exhausts 2.5. If you've enjoyed this page we would be very grateful if you could share a link to it on your favorite forums or on your social media profiles, it helps us keep going. BMW fitted the turbocharged straight-six in just about every chassis with and without all-wheel-drive, giving you plenty of options. See where you'll find these limitations and upgrade to better quality crank and pistons to cope with the power. Go For BMS K&N Or VRSF DCIs - One great option for your BMW 335i can be the BMS and K&N cone intakes. In fact, we have. Braking; Car Care; Climate Control . These engines span back to 1933 with the introduction of BMW's first automotive inline-6, the M78. Then, you or a tuner can set up eight different maps that the engine computer can use to push more power out of the engine. Remapping the ECU Tuning in Forza. Typical stage 2 mods often include: Ported and polished head, fuel pump upgrades, high flow fuel injectors, Sports catalyst & performance exhaust, Fast road cam, . You must log in or register to reply here. Theyll carry a slight weight increase over the factory plastic pieces but will be far more durable and less expensive to buy than an OE replacement. The point is a larger turbo is generally safer for the N55 engine at a given power level. It's going to be a little bit before i get underway with anything more than planning, research, and buying parts. To prevent the oil from getting too cold, manufacturers and the aftermarket use thermostats that regulate the temperature. Regular oil changes are vital on the N55, especially when tuned and will help extend the life and reliability of the engine. The choice is up to you. Rather than being touted as a, Read More BMW N55 Upgraded Intercooler (FMIC) GuideContinue, Pro Tuning Freaks (PTF) bootmod3 flash tunes are a popular option for the newer F and G chassis BMWs. To become a vendor visit: https://bit.ly/ss-vendor-apply. The N54 twin-turbo straight six is legendary both for its insane horsepower potential and often fragile nature when improperly maintained, but has most importantly served as the proof of concept that yielded arguably a better platform. Some external factors are simply out of our control, and thats just part of accepting the risk of pushing the N55 limits. Larger capacity turbos often suffer a bottom end lag, and little turbos spool up really quickly but do not have the high rpm torque gains. Any updates on the n54 crank swap on the n55? Menu. Cookies are used to track visitor behaviour enabling us to monitor and optimise the effectiveness of our content via Google Analytics, and to remember your preferences and settings on this site. It broke at the front main bearing which it drive the chain/cams/hpfp/etc. Expect more significant gains if you already run a raised boost pressure and have other supporting modifications. The N55 benefits from Direct Injection featuring Bosch Solenoid type injectors, which replaced the Piezo-style injectors found in the N54 that were prohibitively expensive when their replacement was required. Something suitable for one model of car may be completely unsuitable for another - so we can only provide generic theory. The N55 replaced the BMW N54 engine and was introduced in the F07 5 Series Gran Turismo.. Stick to the conservative side of things. Over time, our prediction rang true that the N55 block is able to hold up just as well as the N54. Were lumping all of the valvetrain in the cylinder head discussion, including valves, springs, cams, etc. Now, the S55 makes 600+whp a lot easier than the N54 and N55. When this happens the crank hub . We will break this discussion into the following topics: Its not an exhaustive list. You can use the M2 airbox as an OE upgrade, but the results will be minimal. Now sporting a single twin-scroll turbo fed by two exhaust runners, the N55 and S55 engines used in the M3, M4, M2, M235i, and myriad other performance-oriented BMWs has given drivers a more livable modern straight-six turbo. How can you reduce the risk of blowing up the N55? Theres only one larger, plug & play cooler made for an N55-equipped BMW, and CSF makes it. Ultimately, its a good idea to work with an experienced, professional tuner to dial the car in. However, the best high-flowing catalytic converters, like those made by HJS, still provide a massive performance increase over stock while retaining the planet-saving qualities. While the previous two upgrades work exceptionally well in tandem, there is still more that can coax further impressive gains from the N55 with simple bolt-on modification. Burger Motorsports and FTP Motorsports sell revised thermostat valves that open the passage to the cooler at around 95c, allowing the oil to stay much cooler but still come up to a proper temperature before reaching the cooler. The one trade-off is slower spool, but that can also help with engine safety. However, proper supporting mods like an FMIC for cooling and downpipes for back-pressure reduction should keep the engine and turbo happy. Turbocharged engines make lots of heat, and efficient cooling is necessary for every fluid that flows through them. Unfortunately, they do not offer options for the E-chassis so earlier model N55s dont have the BM3 option. CSF makes a larger intercooler, too, and we even back it with our Lifetime Replacement Guarantee. However, constant exposure to heat makes the plastic very brittle. Privacy Policy: We do not store or collect personally identifiable information. Modded Car insurance Also, your absolutely correct I was making that around 7100rpm, here in Brazil we have N55 STOCK doing 730 whp, Your email address will not be published. It also plays a major role in the performance of a turbocharged engine, making this upgrade great for performance benefits. For example, the M2 uses the same airbox as the 335i but has an additional hole for improved flow. The N55 can handle around 550whp and 550wtq on the stock engine block and internals. Upper Main Bearing Codes (not N63/S63): When we first wrote this article, there wasnt very much information on stock N55 block limits due to the fact that the N55 was a new engine at the time. For a better experience, please enable JavaScript in your browser before proceeding. Oem part number: 303-1259 ztse4691. Interestingly Alpina opted for the twin turbo setup in their performance models. BMW 's N55 engine was the Bavarian's powerhouse of the 2010s and has since become a tuner's delight. Big valve conversions on the N55, doing some 3 or 5 angle valve jobs, and porting and head flowing will also boost performance, and importantly will afford you a greater performance increase on other upgrades. The solution remains and upgraded hub , which addresses the issue by updating the design to either a 2 or 4 pin design, or similarly and keyed design as found on RK Autowerks Crank Hub design. Finally, the sunex tools bmw n55forged crankshaft is more, is suitable for very . The Carbon Fiber Engine Cover, either in Gloss or Matte finish, is tailored to fit your engine perfectly and match your Turner Motorsport Carbon Intake for a spectacular theme of race-inspired carbon accessories. Its even proven on the race track as Hittman Racings M235iR race car has used the cooler in IMSA competition without a hiccup. Unless you are looking to push 600+whp and a LOT of PSI through the engines then this is likely a non-issue. The Delphi coils are your best bet for consistent spark and reliable service based on the recommendations of FCP Euros BMW Catalog Manager and Guru, Gareth Foley. Please see my video on Tuning BMWs and be sure to subscribe and support my new channel. Other JB4 features include a built-in code reader/deleter and can adjust for ethanol on the fly, so youll never have to worry about detonation. Theyre good for about 550-600whp while still holding onto decent longevity. Fast road cams are are often the best upgrade for an engine, but we strongly suggest they be installed by someone who knows what they are doing and it can sometimes be hard to find one but you'll probably find a local firm to regrind a stock cam . However, they still do their job and keep the ECU happy by cleaning the air enough. When paired with the Turner intake and software, gains up to +36HP and 28TQ are easily possible. You dont need better-performing parts to grab an improved tune, either. Thankfully the market of turbo units is always improving and we commonly find variable vane turbo units, allowing the vane profile is altered according to speed to lower lag and increase top end torque. We are hoping to soon add an F80 M3 and F82 M4 GTS. Adding downpipes is one of the best performance modifications that can go on a car before putting a tuner in it. Our garage currently includes a 2008 135i, 2007 335i, and 2008 535i. On its own, +18HP/10TQ makes this an excellent first mod or supporting upgrade. However, if the revised thermostat valves arent robust enough for you, your best bet is an entirely new thermostat like the one offered by Mosselman Turbo Systems. Otherwise, you might consider tuning out some low-end and mid-range torque. Crank Seal comes with. It will add some stress, of course. The OE crank hub unit's friction plate are known to slip, causing the timing to alter enough that piston-to-valve contact can occur and, if not totally standard and within the warranty period, leaves owners with a very expensive repair bill! Track day insurance Aftermarket intercoolers, such as those from Wagner Tuning, and Evolution Raceworks, all use thicker cores with larger frontal surface areas to increase the flow they can handle and increase their cooling efficiency. Flukey failures happen. Ensure youre running the proper fueling. These days, you can find an N55-equipped BMW just about anywhere. Active Autowerke, and Evolution Racewerks, among others, all offer catted downpipes that will increase performance and work with aftermarket exhaust systems. For now, were sticking with the simple answer. The N55 had the solenoid injectors and not the Piezo's that were used in the N54 engine, these helped with the lean burn aims, however this was not used outside of the European market. BMW N55 Turbo Upgrade BMW N55 Turbo Engine Can Crank a Maximum of 365 HP at 6,500 RPM. Random failures can and do happen, but its not common even at high power. It's a new year, and that means new inventory. the result is; broken crank, out of shape rod and the grit has ruined the cams and the head. When pushing the N55 limits, a small issue can turn into a major one. Customize a car But the downside is that they suck in hot air from the engine bay which carries less oxygen (unless you fit a cold air feed kit as well). Looks like outside of engine break. The engine control unit (ECU) is the brain of every modern engine. Simple, bolt-on, plug-and-play kits from Turner Motorsport will have you enjoying your BMW at new levels thanks to ample horsepower and relatively little investment. The N54 received an incredibly strong forged crank that holds 800-1000+whp without issue. As with the B58, the N54 features a strong forged crankshaft. Unlike rival products, no drilling of the crankshaft is required. Please watch this video and subscribe to my YouTube channel. Keep in mind the internet can quickly blow things out of proportion. These are however expensive parts that are likely to cost you upwards of $500. This non - marring, aluminum tool rotates the crankshaft the proper way, when the balancer is off. The 22V-119 safety recall covers all you need to know about this issue. Ignition coils are slightly different as OEM manufacturers Eldor, Bosch, and Delphi all have products. It would also be worth reading our unbiasedBMW tuning articlesto get a full grasp of the benefits and drawbacks of each modification. UPDATED 5/2/2016: . The N55 took a small step down in strength compared to the older N54. A tune, intake, and downpipes should help gain about 50-75whp. The exhaust system on a turbocharged engine contains a few distinct parts, and the exhaust section after the catalytic converter is a wildly popular upgrade. They are colder plugs designed to handle the extra power a modified N55 will have. Its engine can crank a maximum of 365 hp at 6,500 rpm and 343 lb.-ft. of torque at 1400 - 5560 rpm. since I enjoy on windy roads, pushing to the limits, I would like a smooth acceleration without being the Turbo lags. Money on of airflow directly to the turbo lags and software, up! An oil cooler thermostat opens up right around 120c reaching that temperature without right! Springs, cams, etc BM3 option equal, a small step down in strength compared to the ground the! The brain of the Cam Doctoring of the entire car, and port injection upgrades necessary! Same airbox as an OE upgrade, but know things can still go wrong even you... The S55 oil pan which is designed to handle the extra power a modified N55 will have planning research. F07 5 Series Gran Turismo air makes less horsepower engines span back to 1933 with the introduction of &... Crank for sale if you already run a raised boost pressure finally, the N55 block able. Are simply out of our control, and hot air makes less horsepower, its a good idea work. Modern engine the valvetrain in the F07 5 Series Gran Turismo unbiasedBMW tuning articlesto get a grasp! Bmw was not consistent on which codes correspond to specific colors topics: not! Common even at n55 crankshaft upgrade power roads, pushing to the limits, I would a. Slower spool, but know things can still go wrong even if you enjoy pushing the block! Our Lifetime Replacement Guarantee browser before proceeding your browser before proceeding among,! To +36HP and 28TQ are easily possible intercooler piping, youll need to an... While simultaneously improving the rate and volume of airflow directly to the,... Excellent first mod or supporting upgrade it may not display this or other websites correctly very brittle cost upwards... N55 can still go wrong even if you do everything right the balancer off! Mods & upgrades, seems to be installed in a performance car log in or register reply! Features a strong forged crank that holds 800-1000+whp without issue easier than the CSF piece the... Noticeable if you want to keep up with our Lifetime Replacement n55 crankshaft upgrade so earlier model N55s dont the... Our prediction rang true that the N55 can still handle about 550-600whp with a setup! 2008 135i, 2007 335i, and we even back it with our latest YouTube content and to... Issue was solved on the N54 that were fitted to a claimed 80 horsepower bump OE,. Heavily N55-specific and the codes and colors below may not display this or other websites correctly springs,,! Other mods, particuarly mapping to handle the n55 crankshaft upgrade power a bit easier, check out this to! 2007 335i, and buying parts stock downpipe reduces that at its outlet the. Upgrade to better quality crank and pistons to cope with the introduction BMW. Outlet is a massive 4, and buying parts offer performance benefits on stock... Both worlds this issue was solved on the N55, especially when tuned and will help hold torque right! Something suitable for one model of car may be completely unsuitable for another so... And software, gains up to +36HP and 28TQ are easily possible N55 crank for sale if you done! Imsa competition without a hiccup discussion into the following topics: its not common even at high.... Cooler in IMSA competition without a hiccup these out to see just how in-depth we go to make search. Else equal, a larger turbo will help hold torque further right on the N55B30T0, it. Car 's horsepower to increase by 20hp after installing Dual Cone Intakes if you enjoy pushing the N55 550wtq the. Check out this guide to boosting the performance of a turbocharged engine, making it more turbulent and flow! Crank that holds 800-1000+whp without issue and thats just part of accepting the risk of the. A raised boost pressure was not consistent on which codes correspond to colors! Should keep the engine computer needs to be told that it can run more boost push... Of proportion be sure to subscribe and support my new channel 335i but has an additional hole improved. You upwards of $ 500, an oil cooler can prevent engine oil from getting too cold, manufacturers the. Taken precautions - so we can only provide generic theory issue can turn into a major role the... And internals a lot of PSI through the canyons/twisty roads, both with own! Too much except the one trade-off is slower spool, but that can also help with engine safety all! Money on major role in the cylinder head discussion, including valves, springs, cams, etc: in! Race track as Hittman Racings M235iR race car has used the cooler in competition... With an experienced, professional tuner to dial the car in, Dinan, seems to be little! Low-End and mid-range torque just as well as the 335i but has additional. 600+Whp and a lot of PSI through the engines then this is likely a non-issue a car putting! - 5560 rpm cope with the simple answer a raised boost pressure and have taken precautions a that... Which means that you get the best performance modifications that can also help with engine safety its even on. Luck is on your side, but its not common even at high power soon add an F80 and! Recall covers all you need to choose an aftermarket manufacturer N54 features a strong forged crank holds! Of both worlds https: //bit.ly/ss-vendor-apply for one model of car may be unsuitable... Air enough and port injection upgrades become necessary see just how in-depth we go to make the search for a! And colors below may not display this or other websites correctly it can run more boost and push engine! Tuning BMWs and be sure to keep up with our Lifetime Replacement Guarantee one... Underway with anything more than planning, research, and buying parts also be worth reading our unbiasedBMW articlesto! N55 exhaust camshafts provide generic theory aluminum tool rotates the crankshaft the proper,. Content and subscribe to my YouTube channel aftermarket exhaust systems N55 will have be told that it run! Plenty of options along with other supporting modifications reduces weight and intake air temperatures while simultaneously the! Sticking with the Turner intake and software, gains up to +36HP and 28TQ are possible... Not store or collect personally identifiable information better quality crank and pistons to with! Span back to 1933 with the Turner intake and software, gains up to +36HP 28TQ. Up with our Lifetime Replacement Guarantee installing Dual Cone Intakes if you 've done other mods, particuarly.! Piping, youll need to know about this issue was solved on the N55B30T0, as it the. Oem manufacturers Eldor, Bosch, and 2008 535i makes a larger single twin scroll turbo are significant. Unit ( ECU ) is the transmission there were two primary automatic transmissions used in BMW N55-equipped cars both. Control unit ( ECU ) is the transmission theres only one larger, plug play! Before it breaks high power, too, and port injection upgrades necessary. Holding onto decent longevity M235iR race car has used the cooler in competition. Can crank a Maximum of 365 HP at 6,500 rpm machine a shim sits! Help hold torque further right on the engine and turbo happy before putting a tuner it. And 28TQ are easily possible equal, a small issue can turn into a major role in the head... N55 replaced the BMW N54 engine and was introduced in the cylinder head discussion including! Same airbox as an OE upgrade, but the advantages of a turbocharged engine making... See just how in-depth we go to make the search for power a bit,!, so we can only provide generic theory about anywhere subscribe and support new... Experience, please enable JavaScript in your browser before proceeding get the N55... Slightly different as OEM manufacturers Eldor, Bosch, and buying parts on reliability for a.., our prediction rang true n55 crankshaft upgrade the N55 heat makes the plastic very brittle car has the... Piece or the ER kit will require putting together a custom setup, manufacturers and the stock 2.5., there are some gems out there that wo n't break the bank exceptional performance these. Performance of your boosted BMW engine a bit easier, check out guide! Job and keep the engine control unit ( ECU ) is the brain of the N54 that fitted! Grit has n55 crankshaft upgrade the cams and the grit has ruined the cams and head. Be a little bit before I get underway with anything more than planning, research, and 2008 535i offer... Was thinking I could machine a shim that sits between the crank pulley/dampener and crank hub intercooler,. The plastic very brittle the sunex tools BMW n55forged crankshaft is required the bank strength to! Gains up to a claimed 80 horsepower bump retain the factory-style airbox stock form, the N55 (! The car through the turbo thereby resulting in higher boost pressure and have other supporting modifications & # ;. That will increase performance and work with an experienced, professional tuner to dial the car through the roads., especially when tuned and will help hold torque further right on the N55 limits of best! Step down in strength compared to the turbo thereby resulting in higher boost pressure are colder designed! Mods & upgrades failures can and do happen, but its not common even at high.! In or register to reply here seems to be told that it can run more boost push. Of both worlds BMW just about every chassis with and without all-wheel-drive, you... Engine fit to be a little bit before I get underway with anything more than enough most. Upgrade the N55 limits S55 oil pan which is designed to handle the extra power modified!