Quote:
Originally Posted by M4XS55
From my understanding, BMW's S55 solution to releasing boost pressure is by managing the throttle plate (by keeping it open on lift-off), and possibly incorporating the valvetrain and wastegates to simultaneously manage the excess pressure in addition to a form of anti-lag.
My question is: when upgrading to larger turbo(s) and upping the boost, is the stock release system sufficient to protect upgraded turbos at higher boost levels? I've spoken to a few people that had their upgraded turbos fail and when looking at their logs, it appeared that the failure came at lift-off so I'm wondering if this could be a result of the stock pressure relief system not adequately releasing the excess boost from the upgraded turbos running higher boost levels.
I see that BMS is coming out with their blow off valve and am potentially interested if it could extend the life of my upgraded turbos. The "cool" sounds don't matter to me.
Any insight would be appreciated.
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I would say on E30 or 91(93) yes. But on E85 you need to at least get port injection to lessen load on HPFP, then also see how stock LPFP does, may need to go stage 3 or 4 for that too