low CR and high boost, or high CR low boost?
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Supreme Member
Joined: Aug 2005
Posts: 3,004
Likes: 4
From: Yellowknife, NWT, Canada
Car: 84 Z28
Engine: 357
Transmission: TH-350C
Axle/Gears: 3.43
low CR and high boost, or high CR low boost?
Just wondering what would be better, to have a very low compression ratio and run an insane ammount of boost or run a fairly high CR and a low boost.
I guess it would all have to do with the flow of the heads and cam specs but in general anyone know which would be better?
I guess it would all have to do with the flow of the heads and cam specs but in general anyone know which would be better?
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Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
For a motor that has to run on street pump gas you'll make more power with a motor that has a low compression ratio and more boost than a high compression ratio motor that willl not allow as much boost without detonation.
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Joined: Jan 2002
Posts: 1,322
Likes: 1
From: Bloomingdale,IL
Car: 91 RS
Engine: 305 Tbi (L03)
Transmission: 700r4
Youll get more peak power out of a motor with high boost and a lower compression ratio. Youll get a flatter torque curve out of a motor with high compression ratio and low boost.
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Joined: Feb 2005
Posts: 1,034
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From: Fort Lauderdale, FL
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 2.73 Posi w/Disc
Agreed with dankhound: If it's a strip-only car, run ~7:1 compression and 20+ psi boost. If it's street-only or street/strip, run 8:1+ and ~10 psi boost. When I get the money for my TT 383, I'd like to run 8:1 and 15 PSI boost.
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