power adder advice

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Feb 27, 2013 | 03:42 PM

#21

T76s10

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From: superior, wi

Quote:

Originally Posted by Jc803

Not trying to cut in, but why is it that everyone is telling me to keep comp ratio around 9.5 for my turbo build? I'll be running e85 also.

Nitto 99, if you want a turbo kit with the hot and cold piping, downpipe, and intercooler with brackets and alt relocate bracket check out Hurron Speed.

People boost ls1's all the time on pump gas and that's 10.5:1. Since his block is forged its more tolerant of detonation and if he does e85 that will cool down combustion. If you are building a motor i would do 10-11:1 on e85 because that will help spool the turbo and will take less boost to make same power as if it were lower comp ratio. If the motor is already put together i wouldn't bother. Only down fall with higher comp is heat and detonation both in which e85 will help aid that.

Feb 28, 2013 | 12:06 AM

#22

Jc803

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From: Lexington, SC

awesome to know. so now I can look around for different heads, because altough everyone says the stock LQ4 heads are nice, i know theres more than flows better, i just didnt consider them because of the high comp ratio

Feb 28, 2013 | 08:02 AM

#23

nitto99

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I have a buddy that has a similar set up, same block different heads and a 12.1 compression. Can he do a turbo with his set up?

Feb 28, 2013 | 08:25 AM

#24

willizm

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From: Joliet,IL and Las Vegas 50/50

OP I'd lean toward a turbo setup over a supercharger just to give you some options in running different fuel at different boost pressures. Since your car sees alot of street duty you could have a c16 or e85 tune and then also a 93 tune and control the boost pressure so that when on 93 you run say 6-8psi safely, but then on the better fuel you flash or swap the pcm and bump the controller up to 12-whatever psi. You can wastegate a centri, but turbo would suit your uses better IMO as it gives you a wider range of options.