Here is the deal. I got my car dyno tuned and i have a nice new supership. Car is runing good i'll find out my ET tomorrow night but all im puttin to the ground is 270 ponies! Not good enough for me. Ive got a 306 with forged TWR pistons (domed of course for that nice high compression, havnt done a compression check yet but i know its up there) E303 Cam, FRPP 1.6 roller rockers, GT40 heads, Trick flow upper and lower inake. Thats the basic engine mods i have. Is it out of the question to blow it? I understand it is possible as long as i run low boost like 6-9psi. Anybody have any idea? Any advice will be greatly appreciated!!
High Compression and Blower?
- Thread starter 87witeTtop
- Start date
gcwh02
New Member
bluevenom867
I will have images of molesting stuffed animals in
gcwh02 said:
Yup.
Also,if race gas is a possablity then most likely you can run more than enough boost on your "high compression" (unless its like 14.5:1,witch I doubt).
Actually, that's not true. You can run a blower and a lot of boost with race gas. I would ask the same question on turbomustangs.com, and in particular I would ask it in the LS1 section. I've seen LS1s running around with blowers and turbos claiming to run stock shortblocks. They come from the factory pushing near 11:1 CR. If they can do it, you probably can too. The thing is, you'd really have retard the timing and keep the boost low to get it to work on pump gas.
But, why go through all the hassle? Just spray it down with nitrous, which isn't affected by compression ratio as much. You can run a 150 shot of nitrous without any problems if you tune for it. If I had your car, this would be my power adder of choice.
Chris
But, why go through all the hassle? Just spray it down with nitrous, which isn't affected by compression ratio as much. You can run a 150 shot of nitrous without any problems if you tune for it. If I had your car, this would be my power adder of choice.
Chris
88Stang331
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- Mar 30, 2006
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QUIKSVT said:
the only thing i have done is heads and intake and i'm putting down 270, with low compression.
Is anything done to those GT40 heads? Any port or valve work? If you are putting 270 with stock gt40 heads I would bet you'd get over 300 with some different heads. Of course you'd want to stay with a 64 or 65cc head because any smaller your CR is going to go up even more. As far as the blower is concerned, if it was me I would not run a blower with a 11:1 CR. Although 6lbs boost may be ok with the right tune. With a 11:1 CR and 6 lbs boost your new CR will be around 15.5:1. At 8lbs boost it will be around 17:1. If you want a blower and some more boost get some head with a BIG combustion chamber...70cc 72cc...to try to get that CR down some. Or you could get some flat top or dished pistons. I know the piston part is a pain but you'd be happy with the end result and some 400+rwhp.
WELL I WAS THINKING THAT THE GUY AIGHT GOING TO RUN RACE GAS.. AS MOST OF US JUST RUN PUMP GAS.. BUT YES EVERYTHING IS POSSIBLE.. BUT I WOULDN'T DO IT.. I WOULD OF RAN 9:1 THEN THE BLOWER.. 11:1CR ON RACE GAS AND 6-9 POUNDS STILL AIGHT SMART.. BUT OH WAIT.. I'M SURE YOU GUYS GOT A "FRIEND" OR "READ" ABOUT A GUY DOING IT..
TELL ME THIS THEN.. IF 11:1CR AND A BLOWER WORKS SO WELL.. THEN WHY IN THE WORLD DOES EVERYONE THAT BUILDS A BLOWER MOTOR RUN LOW COMPRESSION?
TELL ME THIS THEN.. IF 11:1CR AND A BLOWER WORKS SO WELL.. THEN WHY IN THE WORLD DOES EVERYONE THAT BUILDS A BLOWER MOTOR RUN LOW COMPRESSION?
STANGateURlilSS
Founding Member
QUIKSVT said:
wow what a smart guy.. thats probably why he makes 977whp @8000+ rpm on a stock short block lmao
88Stang331
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High compression & boost means you need water/alcohol injection or the order of a Snow unit. See http://www.snowperformance.net/ for more information.
The mid 60's Olds Cutlass had an aluminum block/aluminum head 215 cu in V8 that ran 10.25:1 compression ratio and a small turbo. It used a water/alcohol injection system as standard equipment from the factory to run boost using 100 octane pump gas.
The mid 60's Olds Cutlass had an aluminum block/aluminum head 215 cu in V8 that ran 10.25:1 compression ratio and a small turbo. It used a water/alcohol injection system as standard equipment from the factory to run boost using 100 octane pump gas.
Thanks guys for the advice, i still need to look into this a bit more. As for QuikSVT and luchythirteen13, im sorry that i didnt have you tune my car, i didnt post this thread to ask what you thought my rwhp is nor do i give a crap what you may think. Before you post stupid replies you should check the topic of discussion. Thanks though.
ninety15.0
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- Mar 10, 2004
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Those Hp numbers seem a little low...but they arent that bad. It all depends on the supporting mods. I think that 11:1 is high but its not like that compression alone is going to be worth 50 hp. Tuning has a lot to do with it sure...but with an E-303 and unported gt-40's you cant expect crazy numbers. 87whiteTtop, i would take the advice of some of the others...get some big chambered heads to drop the compression a bit and then run low boost...at that point you will be makin serious power! good luck
87witeTtop said:
your rwhp is right where it should be with those heads im sure of it , but if I were you I would drop the SC idea and get some nitrous , thats what I am going to do with my 306 with 11.5 to one compression , and your compression is probably more like 10.5 to one if anything if the heads are not milled and your engine block was not decked so you might wanna try to check it out to actually see what it is before you make your mind up , if its anywhere close to 10 then a blowers not going to hurt it at all
ninety15.0
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2002BLGT said:
I would also be interested in the Actual CR. I would like to know what kind of pistons are in there to get 11:1 on a stock block/stock gt-40 heads. My CR in my 306 right now is just at 10:1 and im not thinking twice to put a blower on it next spring. Run 6-9 psi and a safe tune with the tweecer...
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