i want to boost my car around 15-20psi max since thats all my greddy kit will be able to give me, but heres my real question should i buy forged lower compression pistons or keep the same compression even thought i know its better to go lower compression it will decrease the power and since im not gonna be boosting enough to compensate for the hp loss im thinking about buying forged 10.1cr pistons instead of 9.1 any thoughts.

 

I get knock on pump gas above 19 PSI. My pistons are 9:1. I have a front-mount intercooler. Forget that it's a Mitsubishi for a second and realize that pump gas has it's limitations. You make power by flowing air, not by pressurizing it. All that does is make the intake charge hotter. Raising the compression will add power, sure... but it's more likely to pre-ignite with pump gas unless the whole front of your car is an intercooler or you're running water injection.

If you're not building that rotating assembly like a brick shithouse, don't raise the compression. Forged pistons will give you a little more durability when you get knock from pre-ignition, but that won't save your rods or crank.

 

im replaceing the rods as well, but im keeping the crank the same, i guess ill just put 9.1cr pistons in it, also just curious what type of turbo are you running.

 

go 9.5:1. Less lag, requires less fuel, and easy to tune. That's what I used on both my builds.

 

what pistons and rods did you use/ perfer this is my first honda build up

 

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from https://www.honda-acura.net/forums/s...d.php?t=227364

 

nice, very nice, do you think forged rods, pistons, cometic head gasket and block guard will be sufficeint for 15psi out of my greddy 18g

 

I do not in any way recommend a block guard. Just sleeve it, don't jack up your block with that half assed pos.

 

block guards work if installed properly. must be so deep all around, tigged in place. have the block resurfaced, line honed, bored then they work great. if ones just pounded into place. it could fuck ur shit up. id trust stock sleeves on 400whp, im running a block guard installed how i mentioned, and i plan on making around 400whp

 

ya i know my budget isnt quite big enough for getting my block sleved and since i probably wont make over 300whp at 15 psi with my greddy kit i just wanted to use a block guard. and heck i might not even need a block guard what are your thoughts?