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Author
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Topic: how much is too much compression for a turbo?
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03SVTPower
CAFords OG
Member # 518
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posted
 
 
Just wondering how much compression is too much to put a turbo on a engine. The engine i have is around 10.5:1. I know thats too high for a supercharger, but what about a turbo. Just wondering/thinking about some options.
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2003 Redfire "AED" Cobra R.I.P
Posts: 3481 | From: Nor-Cal | Registered: Oct 2001
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mtbaughs
Road Racer
Member # 4052
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posted
Nitrous loves compression.
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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wilit
Mustang Messiah
Member # 3367
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posted
10.5 is too high for a super/turbocharger. 9.5 is about as high as you'd want to go. 8.5 would be more desireable.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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mtbaughs
Road Racer
Member # 4052
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posted
Or run some thick ass custom head gaskets and put a blower on it.
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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03SVTPower
CAFords OG
Member # 518
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posted
quote:
Originally posted by mtbaughs:
Nitrous loves compression.
Already have a NX kit! ![[Big Grin]](biggrin.gif)
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2003 Redfire "AED" Cobra R.I.P
Posts: 3481 | From: Nor-Cal | Registered: Oct 2001
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JoeT
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Member # 298
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posted
I doubt you'd be able to run 3 PSI on pump gas.
5-6 PSI might be ok with some 100 octane mixed in.
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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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GradGT
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Member # 3910
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posted
my old car had 10.2:1 compression and people ran turbos on them all the time, on pump gas. Needs an intercooler though, I think. And I dont think anyone went over 9-10psi unless they got race gas, which they then could go to 18psi on. Im not sure this applies to your car, but I'd research it further, as maybe you have a chance.
Posts: 189 | From: Antioch | Registered: Dec 2003
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mtbaughs
Road Racer
Member # 4052
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posted
We ran about five pounds on a 10 3/4 motor at Apex. It was tuned very carefully after the blower went on as you could imagine. Runs with 100 octane fuel only.
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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Bounty Hunter
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Member # 1422
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posted
I wouldn't go any higher than 9:1 on a boosted application.
Posts: 257 | From: All over | Registered: Jun 2002
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Fostang
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Member # 3752
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posted
and to think that I was going to run 10.0:1 compression with 10 psi of boost on a 347 with vic.jr heads. ![[Eek!]](eek.gif)
I was in search of 500 rwhp. ![[Smile]](smile.gif)
But I went with a DOHC instead.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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xchpstang
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Member # 1206
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posted
LS1 motors, LT1 motors, and the pre 03 Cobra motors seem to do OK with boost even though they have moderately high compression. I guess as long as quality fuel is used and it has a good tune it will tolerate boost well.
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04 Cobra, K&N FIPK,
Posts: 239 | From: Turlock | Registered: Apr 2002
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Fostang
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Member # 3752
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posted
Aluminum heads will allow you to get away with a little more boost/timing.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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