Hey all, what will i need to replace to run about 15psi boost on my b18b1 Ls motor?? I've heard of some ppl running 10psi stcok with an excellent tune.. I'm planning on going forged but i dont know if i just need to build the bottom end or what? Thanks guys

 

I would recommend sleeves, rods, and preferably pistons.

 

Do it right and replace your bottom end,shouldnt be more than 1000 or so if ya do it yourself.Also i would look into some turbo cams if ya want a little more pull.Just make sure your tuned good,i know a local who had his 2000 ITR make 410 hp then blew it up and it sits there in his drive way.

 

Don't shoot for a particular boost level, shoot for a power level. 15 psi out of one turbo is a totally different amount of actual air than 15 psi out of another turbo.

So...

How much power do you want to make, how much do you want to spend to get there, and how much do you want to prevent it from blowing up?

 

Exactly what I was thinking. But, if you are going to build your motor, sleave the block.

 

Definitely shoot for a target power. 15PSI is all relative.

Just for shits n giggles, I have seen 15+PSI on completely stock B18B's make great power. Some pretty decent gains can be seen by some headwork as well.

If I were you, Id boost the stock motor. Run 8-10+PSI daily, see how you like it. Thats a good amount of power, and with a solid tune, can be done reliably.

If you want more, or the motor gives, then go ahead and build it. I would at least boost the stock motor though before just going ahead and building it.