how much psi would it take...??
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Teching In
Joined: Jan 2010
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how much psi would it take...?? well i want to built a 408 with 30 over pistons and the 4" crank .... the s/c is a D1 procharger that i just bought .... the intercooler is twice as big as a stock procharger factory intercooler and the piping is aluminuim .... i wanted to put some l92 heads and a spec'd out cam for my set up on this motor that i have in mind..... how psi is the max on the D1 ...?? what CR should be good for this motor for the psi that can the D1 take...?? and i will be running meth
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Joined: Nov 2009
Posts: 620
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From: Brownsville, texas
dd? or just the track?
correct me if im wrong guys,
but anything higher than 15 psi, you should be running race gas or snow kit?
and the CR should be from 8.5 to 9.5?
Im some what new to this... so any one thats willing to correct me please do,
And from what i know a D1 procharger can only go up to 20 psi?
i would say the best psi you can get is 18-20
Then again! im new to this !
hope i helped?
correct me if im wrong guys,
but anything higher than 15 psi, you should be running race gas or snow kit?
and the CR should be from 8.5 to 9.5?
Im some what new to this... so any one thats willing to correct me please do,
And from what i know a D1 procharger can only go up to 20 psi?
i would say the best psi you can get is 18-20
Then again! im new to this !
hope i helped?
TECH Fanatic
Joined: Apr 2008
Posts: 1,775
Likes: 0
From: Shillington PA
dd? or just the track?
correct me if im wrong guys,
but anything higher than 15 psi, you should be running race gas or snow kit?
and the CR should be from 8.5 to 9.5?
Im some what new to this... so any one thats willing to correct me please do,
And from what i know a D1 procharger can only go up to 20 psi?
i would say the best psi you can get is 18-20
Then again! im new to this !
hope i helped?
correct me if im wrong guys,
but anything higher than 15 psi, you should be running race gas or snow kit?
and the CR should be from 8.5 to 9.5?
Im some what new to this... so any one thats willing to correct me please do,
And from what i know a D1 procharger can only go up to 20 psi?
i would say the best psi you can get is 18-20
Then again! im new to this !
hope i helped?
2) 8.5 CR is gonna be a dog before boost comes in. how low of a CR depends on how high you want to turn up the boost, and how you plan on using the car. If its a street car, i'd want to keep at least 9.0:1-9.8:1
3) the better the motor breathes/bigger CI, the lower the maximum psi that the D1 is going to put out. Just like when you see a little honda pushing 30 PSI, that same turbo setup/blower would only put out 8-10 psi on our larger motors. PSI is related to resistance, think of blowing through a straw and a hose pipe... you will get more pressure with a straw, but blow more air through a hose pipe.
hope this makes some sense.
I would say you can get away with a little higher CR like 9.50-10 if you are running meth. You can run pump gas w/o meth if you get the CR low enough but just like the next post up says, if you get it to like 8.5 its going to run like ***
Last edited by XtremeDime; Jan 20, 2010 at 12:33 PM.
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Joined: Nov 2009
Posts: 620
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From: Brownsville, texas
a lot of this is wrong. 1) there's not a certain PSI that you need to use race gas, or a meth/alchy kit, its got to do with compression ratio, timing, IAT's, etc. Its all an individual set up basis
2) 8.5 CR is gonna be a dog before boost comes in. how low of a CR depends on how high you want to turn up the boost, and how you plan on using the car. If its a street car, i'd want to keep at least 9.0:1-9.8:1
3) the better the motor breathes/bigger CI, the lower the maximum psi that the D1 is going to put out. Just like when you see a little honda pushing 30 PSI, that same turbo setup/blower would only put out 8-10 psi on our larger motors. PSI is related to resistance, think of blowing through a straw and a hose pipe... you will get more pressure with a straw, but blow more air through a hose pipe.
hope this makes some sense.
2) 8.5 CR is gonna be a dog before boost comes in. how low of a CR depends on how high you want to turn up the boost, and how you plan on using the car. If its a street car, i'd want to keep at least 9.0:1-9.8:1
3) the better the motor breathes/bigger CI, the lower the maximum psi that the D1 is going to put out. Just like when you see a little honda pushing 30 PSI, that same turbo setup/blower would only put out 8-10 psi on our larger motors. PSI is related to resistance, think of blowing through a straw and a hose pipe... you will get more pressure with a straw, but blow more air through a hose pipe.
hope this makes some sense.
i know the psi is not directly related, but from what ive seen around ls1 tech most people going higher than 15 have a meth kit in handy.
Thread Starter
Teching In
Joined: Jan 2010
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well this is a daily driver but it dont matter on the street manners .... its a ECSB silverado ..... and i am gonna run meth no matter how low my compression is ... i just want it to be safe ....... so can i run 15 + psi yes or no...??
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i would say with that big of a cube motor 15 to 18psi without over spinning the supercharger. Trust is a member here and had a 396 with a d1 and i believe his max psi without overspinning the blower was right around 18.
Im not sure what your wanting exactly but if you go with a smaller cube motor and the d1 procharger with a good set of heads and a speced cam could make better power then doing a big cube motor with the d1, now if you upgrade to a f series procharger down the road then the motor you have in mind would be good.
It all depends on what your wanting
Im not sure what your wanting exactly but if you go with a smaller cube motor and the d1 procharger with a good set of heads and a speced cam could make better power then doing a big cube motor with the d1, now if you upgrade to a f series procharger down the road then the motor you have in mind would be good.
It all depends on what your wanting
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8:1 compression on my old motor, 25 psi on 93 pump gas and meth. dont recommend it and wont do it again. motor was way to laggy until the turbo spooled.
id go 9:5 and run 15psi with meth, the D1sc will run out of steam
id go 9:5 and run 15psi with meth, the D1sc will run out of steam
Thread Starter
Teching In
Joined: Jan 2010
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well i been researching and ppl say that if i go 408 something down the road can happen to the walls and i will have to hooned it and it wont be safe on a 30 over then hooned ...... so they said go 402 (6 ci wont hurt)..... how much is the most psi i could run on the d1 w/o it running out of steem..??
Check out this build, which is pretty much in line with what you're doing.
http://www.exoticperformanceplus.com...Car.php?car=42 Bob
http://www.exoticperformanceplus.com...Car.php?car=42 Bob
