How much boost on 8.5:1 compression
Thread Starter
TECH Apprentice
Joined: Aug 2002
Posts: 335
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From: northern cali.
How much boost on 8.5:1 compression I want to build the lunati forged 347ci kit and put an ATI P1SC on it stage 2 heads and a tr220-224 on a 114 how much can I boost it and do you think a dry 200 shot on top would be overkill Oh and how much Hp do you guys think I'll get .I'm barely pulling the engine and will be bulding it up over a 3 year span thanx in advance 
TECH Senior Member
Joined: Nov 2001
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From: Chi-Town, IL
go with an F1 blower, setup your pulleys for 15 psi, get a front mount intercooler, a big fuel system to support it, and yes the 200 shot is probably a bad idea, you are better off with a boosted motor.........you should be able to get away with a good pump gas tune.....
TECH Addict
Joined: Jun 2002
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I am at 9.2-1 and PSJ is at 9.1-1 and we run 1550 cfm blowers. at 14-18 psi. YOU are going to want to raise that CR a bit. With your CR that high you will need about 20 psi to make what we are making I think. so I would raise the CR and run 15 psi with a F1 or YS
Thread Starter
TECH Apprentice
Joined: Aug 2002
Posts: 335
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From: northern cali.
so you guys think the N2O is a bad Idea? I'm pretty new with the whole F/I thing.I've been Using nitrous for a while and finally grenade the motor.N-E ways I also gotta pass smog is it gonna be harder with the bigger blowers? Oh and the reason I wanna go with the 8.5 comp is cuz I see the 03 Cobra's run that kind of compression and are very streetable
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How much boost you can run is dictated by:
-what fuel you use
-your fuel system
-whether you mess with alchohol injection
So with a bone stock fuel system you can boost like 4psi.
With a bigger intank and a voltage booster you can run maybe 12psi.
With dual intank or a big external like me you can run 17psi no problem. I think I could probably boost to about 22psi.
-what fuel you use
-your fuel system
-whether you mess with alchohol injection
So with a bone stock fuel system you can boost like 4psi.
With a bigger intank and a voltage booster you can run maybe 12psi.
With dual intank or a big external like me you can run 17psi no problem. I think I could probably boost to about 22psi.
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Originally Posted by Evil Turbo SS
I have 8.8:1 CR and am looking to run over 20 psi with a COG Driven F1.
Same here.... 8.5:1 comp but on a 383
. I will Cog my D1-SC and shoot for 15-16 psi like Frcefed and BigBos....... Ill be using dual Walbro intanks and -8an line and bigger rails and 59# injecters also.Kyle
