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Been a long time since i was on the board! honda 4 cyl are a good example of what level of boost you can run on high compression. these motors have around 10:1 to as high as 11.5:1. you can usually run as much as 12 psi on these motors even with the high compression. but have a rich charge, and an efficient intercooler allow this. retarding the timing 4 degrees or so also helps as does of course 93mon+ron/2 octane fuel at the very least. most of the turbo and sc kits come with some room for error, so a nicely tuned kit can usually run 3-5psi more then stock reliably. i have seen 20psi on a 10:1 cr engine on the race fuel once, but thats very extreme. i think the guy with 3 m3's in the thread "fastest road m3" should saddle down and test the limits!? i think the rest of the croud would agree with me there??
lol :0)
ps. my 2.0L engine died this past week. not to fear, i had a spare engine. 3 years of 20psi finally killed the rings!
shaun
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1991 nissan 240sx
sr20det cp pistons, eagle rods, 740cc inj, k3t turbo, jwt s4 cams, lots of duct tape, GReddy headgasket
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