Quote:
Originally Posted by Eldi Z
OK King. That makes sense too, but you analyzed 1 car out of many. Does not mean that the concept is not clear, but I guess there are a few successful examples here and there where KR has not been an issue - not even on 93 (not even talking about 91) and possibly other measures were taken in order to mitigate these adverse effects. Boosting lower than 9 PSI peak and using enough fuel supply might make a successful (Real-World 560-570 WHP) tune possible. Again, I am far from being an expert. I continue learning every day - Including on my new setup. If I will have to "live with" 520 WHP to drive safely in 90+ Ambient, then so be it.
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King is absolutely right. Boosted LT1's live on pump gas when the boost pressure is lower than 9psi and a bunch of timing is pulled to be safe. The number one danger on a boosted LT1 is detonation. It will break the weak LT1 pistons real fast. Second is the heat the top rings are exposed to. Too hot and you break a ring quickly. To mitigate this, boosted stock piston LT1's are usually run rich and low on timing. They make good torque but lay over up top. Pushing past this on pump gas, and your risks greatly increase.
As the blower heats up, the ECU pulls more timing, keeping things safe but also lowering the power. So a dyno pull might show 570 rwhp, but then on the street the car gets slower when things are heat soaked or the blower is hot. You can mitigate this with meth or flex fuel and make more consistent power. But on pump gas, you're stuck with this timing logic.
You can push an LT1 harder if you're spraying meth or using Flex Fuel extract more heat from the combustion chamber, reducing detonation chances and keeping the rings cooler. What King has been saying is not "1 car example". It's be proven time and time again on the LT platform.