Compression and parts to add more psi

[jlmotor1]

I know people ask this allot but I'm thinking of rebuilding my vg30dett engine.Because I want to push more psi than stock but I don't want to damage my engine or invest money into it just because I did not have enough compression. Can some one tell me
what is the best compression to kick your psi a little bit up and the necessary parts to get any info would be very helpfull thanks for your help guy's

[vulcanrush]

i'm not sure i understand your question, but let me see if i got it right ---

you have low compression on your engine, right now? have you compression-tested it? what are the numbers?

i wouldn't run more or higher psi than stock with a low-compression engine, that's what the rebuild is for.

a healthy compression for a vg30dett engine is 150+.

[itsa300zx]

Stick with stock comp numbers 8.5 to 1. Rebuild with stronger parts and run higher boost for power. High comp and boost do not mix well. Check out what Kyle has to offer at Import Parts Pro (IPP.com)

[car nut]

I'm pretty sure he's asking about bumping up his compression ratio as opposed to pushing more psi through his turbos.

It's easier to install bigger turbos than it is to pull apart your whole motor and install higher compression pistons.

[itsa300zx]

I'm pretty sure he's asking about bumping up his compression ratio as opposed to pushing more psi through his turbos.

It's easier to install bigger turbos than it is to pull apart your whole motor and install higher compression pistons.

I realize that. I'm just saying that boosting hi comp engine is not good and that higher boost is a better/safe way to get more power.

[vulcanrush]

I'm pretty sure he's asking about bumping up his compression ratio as opposed to pushing more psi through his turbos.

It's easier to install bigger turbos than it is to pull apart your whole motor and install higher compression pistons.

i think he might be talking about the compression of his engine (i.e., 150+ is a decent compression) as opposed to the compression ratio...he does mention "rebuilding" his engine and not having enough compression, which causes me to think he has a low-compression engine, piston rings, valves, etc. just a guess.

[jlmotor1]

I'm pretty sure he's asking about bumping up his compression ratio as opposed to pushing more psi through his turbos.

It's easier to install bigger turbos than it is to pull apart your whole motor and install higher compression pistons.

i think he might be talking about the compression of his engine (i.e., 150+ is a decent compression) as opposed to the compression ratio...he does mention "rebuilding" his engine and not having enough compression, which causes me to think he has a low-compression engine, piston rings, valves, etc. just a guess.

No I was trying to say that whats the best compression ratios to run some high psi??

[vulcanrush]

No I was trying to say that whats the best compression ratios to run some high psi??

typically, on pump gas such as 93 octane, i've seen people run up to 18psi.
8.5:1 is stock, the lower the compression ratio, the more boost you can run, but there are a lot of other factors such as the fuel you can run/get, the intercoolers, etc. you can run racing fuel or use methanol/water injection to run higher boost. but it's not just the compression ratio you have to think about.