#Bmw itrash full#

Ultimately, you are pushing the turbo a lot harder for a smaller amount of performance gain. Running above the 20psi mark will create a flattened benefit curve, as turbo efficiency will decrease. Just because one individual has made it 50k miles, doesn't mean yours won't die at 5,000 miles. With that being said, there is obviously a significantly elevated risk of blowing a turbo at these boost levels. We've heard reports from people running 20-21psi for 20,000+ miles without any issues, with one report from a forum member saying he has been running 20psi for 50,00 miles.įrom what we've been able to gather, it appears the turbocharger on the B58 is very strong. The one thing that is certain is that the engine internals are certainly capable of holding these boost levels.

It's hard to say exactly how long the stock turbo will last at 20psi or more. Given the engine is a few years younger, there might be a few more psi to come in the future once the fueling piece gets figured out. While the max boost on an N55 is in the 24-26psi range, the B58 seems to be capped due to fueling. 20psi or more of boost is usually hit around the 500-1,000rpm range, and then tapers off until redline, with max redline boost around 11-13psi.

#Bmw itrash full#

To break the 20+psi mark, you're going to want full supporting mods (intake, intercooler, chargepipe, DP's, etc) and should be running meth/PI and an ethanol fuel mix. 20-21 psi is what we consider the safe max boost, but have heard of a few folks running 21-22psi reliably.23-24 psi is the max boost we have seen so far.Running the turbos at max boost for a prolonged period of time will have significant wear on the turbos and overall engine, and therefore reduce longevity and reliability. With that being said, there is a fine line between maximum boost, and maximum reliable boost. However, as with most BMW engines, the B58 is significantly underrated from the factory, and the engine is built to hold significantly more power and more boost than you'll find on the stock tune. 8-11psi, which is slightly up from the 7-10psi found in the N54 and N55. On the stock ECU tune, the B58 will produce a maximum boost of approx. How much boost can the stock B58 turbocharger handle? How much boost (psi) can I run without hurting reliability? B58 Stock Turbo Max Boost We're here to answer some frequently asked questions on B58 boost levels: Turbochargers, engine internals, and ancillarily engine support systems can only hold so much boost before they give in. While the phrase that something is 'an art, not science' is used frequently, it does not hold true with turbo boost and tuning.