Quote:
Originally Posted by Dragoneye
Even you must take account for Direct Injection, spike.
It cools the charge for one, it also sprays right before the end of compression (so for the most part, all you're compressing is air).
AND, they don't even reccomend premium for this engine, so I think it's safe to assume that there's wiggle room for FI once somebody gets the computer tuning down.
DI is a whole new game.......
fwiw; I'm no expert -- but I've read quite a bit on this, if that means anything -- I think you could run 5psi without breaking anything; but I wouldn't go any higher...
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im not saying that its bad to do it because of the DI/cr. im saying that by putting boost on a motor that already has a static cr of 12:1 is going to be tricky to say the least. there's this little thing called......oh......wait.....ummmmmm....... oh yeah, blown head gaskets/seals/heads in general/valve stems/valves etc. thats why i made the comment about having the ideal cr at 9.5 or so. any higher than that, and you need to watch how much you turn up the boost or you're gonna blow something up...literally, up, up and away