How much boost before pump gas will not work?
TECH Enthusiast
Joined: Nov 2003
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Originally Posted by waterbug1999
Maybe PSJ can chime in... 
Ive just heard that the lower the compression the less streetable (with pump gas) it becomes. Just trying to get the right combination (CR/PSI) for max potential..
Ive just heard that the lower the compression the less streetable (with pump gas) it becomes. Just trying to get the right combination (CR/PSI) for max potential..
12 Second Truck Club
Joined: Feb 2002
Posts: 5,574
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From: Sacramento, CA
Originally Posted by parish8
the only problem with lower compresion is he will need a blower that can push some air. i dont know much about blowers, will a D1 push that much air? like 15psi on a 427?
Originally Posted by F8L Z71
The D1 supposedly flows up to 1400cfm, can support about 900HP and spin around 60,000 to 65,000 RPM.
NOGO said it was like 900cfm. Guess ill have to give ATI a call and see what CFM the D1 flows.....
Looked at the web-site and it was 1400 CFM on the D-1SC.... That should be enough for a 427 then right?...
http://www.procharger.com/models.shtml
http://www.procharger.com/models.shtml
Last edited by waterbug1999; Aug 11, 2004 at 02:06 AM.
TECH Enthusiast
Joined: Dec 2001
Posts: 548
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From: Dublin, CA
Originally Posted by waterbug1999
Looking into getting forged block and boosting the hell out of it with a S/C. But when is too much boost gonna make me run race fuel. Someone told me 15psi but was reading another thread and saw were the cobras were around 20psi. So that confused me. Can someone shed some light please. Thanks
From an ATI document:
I've just been reading Eviltwin's comments, I'm with him 100%.
You have to sift through the generalizations when you design an FI setup.
A boosted 427ci could make 800rwhp on pump gas no problem. Keep the compression low. Go 8:1. One point of compression reduces power by 3%. That's not very much. When folks talk about laggy low compression engines they are talking about heavy 4 and 6 cylinder cars.
Tangentially my 746rwhp setup made 600rwhp at 5200 rpms. I was making 550 around 4800 rpms. So I probably make about 450rwhp at 4000 rpms.
Whenever I see folks advocate more than 9:1 compression for an LS1 I don't think they have personal experience with this stuff and are just passing on what JoeBobBuilder told them.
Back on target. Well I think an 8:1 348ci could hit 800rwhp on pump gas with a FMIC and no alky. I think a 427ci could do 900rwhp at 8:1 without aids, maybe a little help. Remember we are modding one of the most effecient and well designed engines that has come out of GM or Japan in the last 20 years.
You have to sift through the generalizations when you design an FI setup.
A boosted 427ci could make 800rwhp on pump gas no problem. Keep the compression low. Go 8:1. One point of compression reduces power by 3%. That's not very much. When folks talk about laggy low compression engines they are talking about heavy 4 and 6 cylinder cars.
Tangentially my 746rwhp setup made 600rwhp at 5200 rpms. I was making 550 around 4800 rpms. So I probably make about 450rwhp at 4000 rpms.
Whenever I see folks advocate more than 9:1 compression for an LS1 I don't think they have personal experience with this stuff and are just passing on what JoeBobBuilder told them.
Back on target. Well I think an 8:1 348ci could hit 800rwhp on pump gas with a FMIC and no alky. I think a 427ci could do 900rwhp at 8:1 without aids, maybe a little help. Remember we are modding one of the most effecient and well designed engines that has come out of GM or Japan in the last 20 years.
Originally Posted by Pro Stock John
I've just been reading Eviltwin's comments, I'm with him 100%.
You have to sift through the generalizations when you design an FI setup.
A boosted 427ci could make 800rwhp on pump gas no problem. Keep the compression low. Go 8:1. One point of compression reduces power by 3%. That's not very much. When folks talk about laggy low compression engines they are talking about heavy 4 and 6 cylinder cars.
Tangentially my 746rwhp setup made 600rwhp at 5200 rpms. I was making 550 around 4800 rpms. So I probably make about 450rwhp at 4000 rpms.
Whenever I see folks advocate more than 9:1 compression for an LS1 I don't think they have personal experience with this stuff and are just passing on what JoeBobBuilder told them.
Back on target. Well I think an 8:1 348ci could hit 800rwhp on pump gas with a FMIC and no alky. I think a 427ci could do 900rwhp at 8:1 without aids, maybe a little help. Remember we are modding one of the most effecient and well designed engines that has come out of GM or Japan in the last 20 years.
You have to sift through the generalizations when you design an FI setup.
A boosted 427ci could make 800rwhp on pump gas no problem. Keep the compression low. Go 8:1. One point of compression reduces power by 3%. That's not very much. When folks talk about laggy low compression engines they are talking about heavy 4 and 6 cylinder cars.
Tangentially my 746rwhp setup made 600rwhp at 5200 rpms. I was making 550 around 4800 rpms. So I probably make about 450rwhp at 4000 rpms.
Whenever I see folks advocate more than 9:1 compression for an LS1 I don't think they have personal experience with this stuff and are just passing on what JoeBobBuilder told them.
Back on target. Well I think an 8:1 348ci could hit 800rwhp on pump gas with a FMIC and no alky. I think a 427ci could do 900rwhp at 8:1 without aids, maybe a little help. Remember we are modding one of the most effecient and well designed engines that has come out of GM or Japan in the last 20 years.
Sounds good. I guess ill go with an 8:1 CR on the motor and buy the F-1.. That should be enough boost.. I think the ATI procharger is the best on the market for boost that i have seen. What do you guys think? FMIC?? What does sthat stand for Pro Stock John?
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Originally Posted by waterbug1999
NOGO said it was like 900cfm. Guess ill have to give ATI a call and see what CFM the D1 flows.....
-Kevin
12 Second Truck Club
Joined: Feb 2002
Posts: 5,574
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From: Sacramento, CA
Originally Posted by NoGo
The D1 flows up to about 1400 CFM. It is the ATI intercoolers and piping that I say chokes at around 900 CFM (despite what ATI says).
-Kevin
-Kevin
Originally Posted by NoGo
The D1 flows up to about 1400 CFM. It is the ATI intercoolers and piping that I say chokes at around 900 CFM (despite what ATI says).
-Kevin
-Kevin
Originally Posted by waterbug1999
Hey NoGo.. Whats your setup on your 383? CR & S/C/Turbo. Nice numbers by the way.
D1 SC Supercharger @ 14-15 psi at peak HP.
There's another thread floating around where I posted all the specs.
