Quote:
Originally Posted by Headracer
The 15 psi/560hp numbers came from the youtube description of the first video posted in this thread (last sentence in the description). Though you make a very fair point about total volume of air flow vs. simple boost pressure, it is the same idea I was expressing in my post. A turbo can flow an insane volume of air at insane boost, but if the fuel can't handle the combined pressure of boost+compression, it will still pre-combust or make the engine suffer detonation. The reason for this is that it is very easy to boost such a volume/psi of air that injecting the required amount of fuel to burn with it creates a situation with extremely high compression ratios. Given race fuel that can be compressed to this degree, there is no problem and huge power is surely on tap. My skepticism stems from the fact that 1)I've never seen a 15psi/560hp eclipse before but more importantly 2)I find it hard to believe that a 2.0L engine could have enough fuel and air pumped into it to produce that amount of horsepower without requiring a far higher octane rating than 93. A racing fuel would allow about 1.75 times as much fuel/air to be compressed in the chamber while still avoiding detonation. To put things in perspective, the 2.3 liter race tune engines in the IMSA Lite cars we run only put out 100hp/liter on race gas, although I grant that they are N/A and not turbo.
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Use a Garrett GT4094 and you can flow enough to make 560@15psi.
TurboByGarrett.com - Catalog
I work at a shop that builds EVO/DSMs. 560whp in a 2.0 4G63 is just a daily driver, nothing far out or extreme.
My Miata has a tiny turbo, and it can make 250-270 @15psi, on a 1.6l motor.