ls bottom end 81.50mm with 9.9 forged pistons and h beam forged rods turbo...stock sleeves...350whp is the goal..just want some opinions of if this should be safe or not...any info appreciated....hopefully first hand info..

 

Yeah it will be ok with a vtec head as long as the tune is good. Use a 57 trim or 60 trim t3/t04e.

 

well i already have a t3t4 turbonetics turbo..i dont know the exact trim...but i also might be wrong about the piston comp ratio...im tryin to figure it out...but they are 9.8:1 in a gsr...so .i have a ls bottom end..ls crank/rods and b16a head..what comp would be too high for turbo and 350whp..cuz obviously with higher compression itll take less boost to make 350whp..i think with t3t4 10psi should b close..over 300whp..but one site said about 9.9:1 while another said 10.34:1....so im not positive yet..?

 

Don't get caught up over .3 in compression, it won't make much difference. Stay close to 10:1. If it ill make you feel better buy a thicker cometic but I wouldn't worry about it. Personally I try to get around 8.5-9:1 on turbo motors.

 

but kj wouldnt the 8.5-9 produce less hp per lb of boost compared to 10:1..?..cuz i have a stock head and im thinkin if it takes more boost lets say...i have 8.5:1 and have to run 18lbs to make 350whp...where i could go 10:1 and 10lbs and have close or around the same??...or would i be better off doing the 8.5-9:1 .... u see what im gettin at...thx for ur professional opinion though..i might go ahead and get 9:1...cuz the guy who i was thinkin of buyin pistons off of wants 450 which is pretty much brand new pricing...so..ill see what happens..thx..

 

sleeve it and be safe. dont drive a ticking time bomb. some get lucky and hit that 300whp mark but how long will it last?

 

well im going to stick with 9.0:1..and ill def keep the sleeves in mind..i just need to know what kind of money im workin with..since we all know i just got fawked over again...

 

10,000 miles on my stock sleeve motor. Over 300whp Do I recommend stock sleeves to everyone? No. Do I recommend sleeving to everyone? No

If you're worried about hp per psi your turbo is too small