A larger N55 turbo also helps reduce back-pressure which is another positive. CP-FPS-N55 . They bolt in and can be easily removed so are favored by many. BMW N55 Engine Rebuild Tools: https://amzn.to/3uHUwh5 Parts: https://amzn.to/37W6GsSPart 3: https://youtu.be/aTXyclFhUUUAfter getting all of the parts necess. Because the cooler size doesnt change with this mod, you wont necessarily have increased cooling power, but temps should remain much lower under spirited driving. 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. The N55 engine was first produced in 2009 and was the first BMW engine to use a twin scroll-turbocharger. Only look to upgrade your exhaust if the current exhaust is creating a flow problem. Sounds like you knocked out some good preventative maintenance. It would also be worth reading our unbiasedBMW tuning articlesto get a full grasp of the benefits and drawbacks of each modification. Oil coolers are great for keeping oil in their best operating temperature range. Automotive Replacement Engine Crankshafts. I had no clue this was even possible. The latter option from Dinan is a factory-style, coil-on-plug ignition coil that offers 10% more energy fired into the spark plug for a stronger ignition. An FMIC is also a great mod that you might find a lot of joy in. In some cases flywheel lightening is not a great mod for all N55 engines. Be sure to keep up with our latest YouTube content and subscribe. Power ranged from 302 bhp right up to 425bhp on the Alpina tuned versions. N55 Tuning Stages. The N55 can handle around 550whp and 550wtq on the stock engine block and internals. Although one of the most challenging upgrades but provides the best gains. Help us improve, leave a suggestion or tip. Beyond the exhaust construction, the brand isnt too important. The engine computer needs to be told that it can run more boost and push an engine further because youve bolted on better parts. Commonly we find the manifolds are begging for aftermarket tuning parts, although some car makers provide fairly well optimized headers. Crank Seal comes with. "Thanks for reading our N55 tuning guide". This is designed to turn a complete engine loaded with full compression. Drop a comment and let us know! Rods, pistons, and bearings are a few areas that will first cause trouble. Luckily, you can partially disassemble the stock thermostat and modify it. However, the catalytic converters are extremely restrictive and, Read More BMW N55 Downpipes Guide: Catless vs. High-FlowContinue, Were finally following up our general MHD post. Thanks. Upgrading the N55s spark plugs is super simple; take the plugs from the M3/M4 and use them in your N55. 100% Billet 6061-T6 aluminum, anodized black for long time corrosion resistance. Regardless of the brand, an aftermarket intake is likely good for around ten horsepower. I think i have an OCZ, some hoses, and a window regulator somewhere. Dual 1/2" square drive & 22mm square drive with 12mm rotating pivot pin. Free shipping for many products! These 5 come in under $10,000. Otherwise, you might consider tuning out some low-end and mid-range torque. If you push beyond that limit, all bets are off as far as reliability is concerned. I have a good n54 crank on hand. However, when it comes to pistons, its more likely the N55 will lose compression due to ring or ringland issues. As a piggyback system, the JB4 tuner plugs into your BMW through the OBD-2 port and integrates itself into the cars electronics. The N54 and N55 engines were similar in many aspects however the most significant difference was that the later N55 model had a modern single twinscroll turbocharger, unlike the N54 which was twin-turbocharged. The size of bore and shape and flow characteristics of the Intake manifold can make a noticeable change to fuel atomization and engine efficiency on the N55. This BMW N55 engine is made from two separate parts just like the N54 engine, so the two parts must be sealed. When pushing the N55 limits, a small issue can turn into a major one. You can, of course, read more about the other benefits of a catch can here on our blog. Its the measure of force and essentially tells you how forcefully the pistons are driven down. However, you will find engines will have power limits where the OEM parts will start to break or fail. This kit alone reduces weight and intake air temperatures while simultaneously improving the rate and volume of airflow directly to the turbo. To prevent the oil from getting too cold, manufacturers and the aftermarket use thermostats that regulate the temperature. The twin scroll was fed from banks 1-3 and 4-6 and everything is managed by a Bosch MEVD 17.2 ECU. Arrow Precision Connecting Rod Set, BMW N55/S55. Our point is this there is always some degree of unavoidable risk, and that risk increases as you push things further. Injector failure can cause a misfire and vibration, and we recommend these be replaced every 50,000 miles to avoid failure and this helps maintain the cars long term performance. What are the limits of the N55 fuel system? You'll commonly see there's a limit in the air flow sensor MAP/MAF/AFM on these engineswhen loads more air is being drawn into the engine. How does E85 affect the N55 fueling limits? you're asking. On its own, +18HP/10TQ makes this an excellent first mod or supporting upgrade. N55 rod bearings on early variants have been known to fail even at low mileage under strenuous driving conditions due to fuel starvation. Do you want a civil 3-series or a sleeper X5 with 400-wheel horsepower? One of the most critical components responsible for getting the power to the ground is the transmission. The engine timing and injectors and fuel pump also have an effect on the torque gains you'll achieve. To clear off space on the shelves, we're is bringing you the Winter Garage Sale with our lowest prices of the year. Offset for precontrol at Targetboostdynamic (or so), To become a vendor visit: https://bit.ly/ss-vendor-apply. I tested the rotational drag on the crankshaft as well as determined crankshaft axial clearance.BMW N55 Engine Rebuild Project Playlist: https://youtube.com/playlist?list=PLfGJyGAcNr7-J2rSmmcNcQIT0QIvi2jCLBMW 335i Playlist: https://youtube.com/playlist?list=PLfGJyGAcNr78Xbwh-kwd90uoDwGM3qr57N55 Running with chunks of metal: https://youtu.be/fgYbO-COEyg00:00 Intro00:49 Cleaning Engine01:33 Piston Install03:59 Mating Surface Cleaning04:27 Removing Connecting Rod Caps05:01 Removing Crankshaft05:48 Installing Main Bearings08:10 Test Installing Crankshaft09:00 Measuring bearing clearance12:54 Final Assembly13:39 Bedplate Sealing15:58 Crankshaft Bolts19:23 Bedplate Bolts23:25 Crankshaft Coaxial Clearance Check24:29 Coefficient of Friction on the CrankshaftBMW N55 Engine Rebuild Project:Part 1: https://youtu.be/YwakFiOahWQPart 2: https://youtu.be/GpFGxolRnFUPart 3: https://youtu.be/aTXyclFhUUUPart 4: https://youtu.be/vZB8ph2pmqMPart 5: https://youtu.be/-apNebfNCMAPart 6: https://youtu.be/5BHBoLIio14Part 7: https://youtu.be/TRsJIoWPzl0Part 8: https://youtu.be/CtXZ7jsuh1gPart 9: https://youtu.be/VR1D8ULcqqY______Support me:https://www.patreon.com/Simplecarguyhttps://www.instagram.com/simplecarguy/http://simplecarguy.com------------------------------Links are affiliated where possible.This means if you click on the link and purchase the product, I will earn a commission. Very good source of info! Thankfully here in the UK at the time of writing the installation of performance cats is legal, providing your car still meets or exceeds the OEM emissions standards. How can you reduce the risk of blowing up the N55? Speedtech N55 Stage 3 Turbo Upgrade. You can purchase the RK Autowerks Billet Crank Hub in our store! Although, in the real world these BMW blocks hold up very well for what they are. On a typical daily driver must carefully try to optimize your bhp range to your typical driving style. I love your site and articles! Well let us know.. At $69.00 it's easy on the budget. Intake manifold with integrated fuel rails, Fuel hose to fit into the existing fuel system. Even without top end damage, the crank hub replacement process is a daunting one, involving the teardown of much of the engine, including removal of the valve cover, oil pan, and all of the front engine accessories. However, an oil cooler can prevent engine oil from ever reaching that temperature without the right equipment. 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. There are tons of companies offering N55 exhausts. Free shipping. Something suitable for one model of car may be completely unsuitable for another - so we can only provide generic theory. Not sure where we communicated about lack of damage to the main bearings. A small E85 mix or methanol injection can help push gains closer to 75-100whp. Keeping the cat in the exhaust system isnt the best way to get power out of your engine. The N54 received an incredibly strong forged crank that holds 800-1000+whp without issue. The engine control unit (ECU) is the brain of every modern engine. Every N55 is equipped with an oil cooler right from the factory. 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. 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). CP-Carrillo Connecting Rod Set, BMW N55. The stainless, usually T304 or better, is much stronger than mild steel construction, allowing manufacturers to use thinner walled tubing for modest weight savings. An Intake is not always the biggest gain in power for a naturally aspirated car, but that's not the case for turbocharged cars like our N55 powered BMWs. 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