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Wondering how much boost or hp is being made with e-85 fuel on blow through carb application without an intercooler.

What would be the ideal compression ratio to use with a 540 ci bbc turbocharged motor without an intercooler???
 

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I'm in the process of doing this except with EFI. 383ci, GM TPI with 83# injectors, twin 57mm BWs, on E85. I'm figuring around 10# of boost or so for the street on no IC. This is in an '81 Corvette so space is very limited. I hope I can get away with it.
 

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Wondering how much boost or hp is being made with e-85 fuel on blow through carb application without an intercooler.

What would be the ideal compression ratio to use with a 540 ci bbc turbocharged motor without an intercooler???
I know of a few guys running mid to low 20's with boost without an intercooler and no issues. They are around 9-1 compression. 1200-1400 rwhp.



I'm in the process of doing this except with EFI. 383ci, GM TPI with 83# injectors, twin 57mm BWs, on E85. I'm figuring around 10# of boost or so for the street on no IC. This is in an '81 Corvette so space is very limited. I hope I can get away with it.
No problem.
 

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So far we've made 940rwhp/1100rwft/lbs on 20psi with our 350ci SBC. CSU 750 Blo thru e85 non intercooled @ 7.2:1 compression. Twin Garret GT3582s.

Just fired the car up in the shed Monday night with brand new CSU 850 E85 carb. Pushed through the converter real easy and had 20psi @ 4000rpm on the two step - sweet indeed! If the bottom end will hang together long enough we are eventually aiming for around 1200rwhp @ 30 psi. I'll be back on here bragging loudly if we make it.... :smt073
 

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So far we've made 940rwhp/1100rwft/lbs on 20psi with our 350ci SBC. CSU 750 Blo thru e85 non intercooled @ 7.2:1 compression. Twin Garret GT3582s.

Just fired the car up in the shed Monday night with brand new CSU 850 E85 carb. Pushed through the converter real easy and had 20psi @ 4000rpm on the two step - sweet indeed! If the bottom end will hang together long enough we are eventually aiming for around 1200rwhp @ 30 psi. I'll be back on here bragging loudly if we make it.... :smt073
its gotta be a dynojet or a dynocm dyno.
 

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I run a big single, e85, no intercooler, and the car makes 31 lbs of boost, c&s blow thru 1000 cfmm dominator
 

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So far we've made 940rwhp/1100rwft/lbs on 20psi with our 350ci SBC. CSU 750 Blo thru e85 non intercooled @ 7.2:1 compression. Twin Garret GT3582s.

Just fired the car up in the shed Monday night with brand new CSU 850 E85 carb. Pushed through the converter real easy and had 20psi @ 4000rpm on the two step - sweet indeed! If the bottom end will hang together long enough we are eventually aiming for around 1200rwhp @ 30 psi. I'll be back on here bragging loudly if we make it.... :smt073
WHAT HEADS BECAUSE THIS IS VERY HARD TO BELIEVE
 

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I made 1016 rwhp on 12psi with 502". It was 10.8 to 1. Don't be too afraid of compression with E-85 as long as you are building a low boost engine.
 

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Just use an injector calculator and multiply whatever it tells you by 1.4 to account for the extra fuel volume needed.
 
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