ob1eg

I was wondering when your compression ration is too low for boost?I have a 93 d16z1 bottom end with a 94 d16z6 head if I use the z6 head gasket the compression is going to be 7.7:1 or 8.0:1 I got these numbers from the compression caculator link on sohchonda.com is this too low?would my car be a fat turd with this setup?if anyone has some info on this please let me know..thanks

Ravage70

i dont think those number are accurate

jspec89

i didnt think there was a such thing as 2 low compression for a turbo engine. i know that the lower the compression the more boost u can run with less chance of detonation. some professional drag teams run like 11 comp with boost. its all about proper tuning

ob1eg

thanks for the input,I've been trying to get as much feedback as possable.I hope to run 10psi or so hopefuly the engine runs good.please let me know if anyone has more info..thanks...

Ravage70

whats the stock compression on a d15z1

oh nvm u said d16

con

too low equals no power unless your in boost, makes a shitty car to drive with huge lag.

baldur

The professional drag teams also run either methanol or 120 octane leaded race gas plus ice water intercooler, and they only run their engines for a minute or so each time.
Too low compression means you probably won't be able to get the flame speed high enough to make some power, plus the volumetric and thermal efficiency goes to hell. But that's only if your compression is like 4:1.
7:1 compression is great, it's the potential to run over 30psi on street gas and make lots of power without grenading.

Dr.Boost

I think I'd slit my rists if I drove a car with 7:1 compression. Turbo lag would own your ***. You'd be getting smoked by Geo Metros off the line with a 7:1 compression ratio. I wouldn't go below 8:1, and that's even too low.

Tuning is the key and if you're not going to tune it you shouldn't be running high boost with low compression or low boost with high compression.
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