Voretc Pulley Q
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From: ames ia
Vortec Pulley Q
What boost level should be seen on a V3-Si unit with a 3.6" pulley on a bone stock LS1... I thought 8-9 psi on a 3.6.....However, now I think I am wrong
A short burst run tonight in mexico, I saw 12 psi at the top of 2nd. It was a fairly chilly night 60 degrees. However, I am uncertain if that is the norm, or if I had a bunk gauge, or if it was just a cool night, and boost was the name of the game...
Forgive the ignorance here, I am hacking through a system that was installed on the car before I bought it.... Finding many things that were done wrong...
Logged MAF Hz, seems to suggest I was definitely pushing some air, I saw a max over 12,500 Hz...
Starting to think I need to grab a pulley ~3.8" or something as pushing 12 psi on a stock everything LS1 seems a bit daring (even with zero knock)...
A short burst run tonight in mexico, I saw 12 psi at the top of 2nd. It was a fairly chilly night 60 degrees. However, I am uncertain if that is the norm, or if I had a bunk gauge, or if it was just a cool night, and boost was the name of the game...
Forgive the ignorance here, I am hacking through a system that was installed on the car before I bought it.... Finding many things that were done wrong...
Logged MAF Hz, seems to suggest I was definitely pushing some air, I saw a max over 12,500 Hz...
Starting to think I need to grab a pulley ~3.8" or something as pushing 12 psi on a stock everything LS1 seems a bit daring (even with zero knock)...
Last edited by GoatKart; Sep 23, 2013 at 02:08 AM.
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
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From: Earth, United States
Sometimes it's hard to say hey a car with X blower and x diameter crank pulley on X engine combo at X RPM will make x.xx amount of boost. Log M.A.P. Kph and look at my quick reference chart in the stickys at the top or do the math yourself and try to compare it to your boost gauge.
BTW 12 psi isn't anything a stock LS1 can't handle.
BTW 12 psi isn't anything a stock LS1 can't handle.
Last edited by MVP'S ZO6; Sep 23, 2013 at 10:26 AM.
Thread Starter
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Joined: Mar 2006
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From: ames ia
Sometimes it's hard to say hey a car with X blower and x diameter crank pulley on X engine combo at X RPM will make x.xx amount of boost. Log M.A.P. Kph and look at my quick reference chart in the stickys at the top or do the math yourself and try to compare it to your boost gauge.
BTW 12 psi isn't anything a stock LS1 can't handle.
BTW 12 psi isn't anything a stock LS1 can't handle.
Melting Slicks
Joined: Mar 2005
Posts: 2,225
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From: Okinawa
Might want to think about getting a 2 bar map. You could be close to maxing the maf and the first time that happens you will might poo a little.
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
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From: Earth, United States
I agree with Milan. On another note you should really consider a 2 bar SD OS. It's night and day. Then in your case there won't be any guessing. It's a couple hundred bucks well spent. 
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From: ames ia
The 2bar SD is already in the works... I am just sorting things out still...
I am actually debating a couple different approaches at the moment...
1) Get Meth injection, and setup a 2bar SD tune... Do headers next year
2) Do headers, 2bar SD tune and do meth injection next year...
Both have pros and cons just cant decide the best route to go...
I am actually debating a couple different approaches at the moment...
1) Get Meth injection, and setup a 2bar SD tune... Do headers next year
2) Do headers, 2bar SD tune and do meth injection next year...
Both have pros and cons just cant decide the best route to go...
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From: ames ia
I can't help but be a bit nervous about the 12 lbs though. I was always under the assumption 10lbs was when a person should start getting nervous...
Any input on on meth kits?
Appreciate the input, Sounds like 12 lbs it is.
I actually dropped my shift points down to 6,000 rpm so that I could reduce boost just a tad more. I was shifting 6,200 or so. SO hopefully it pulls it down just a smidgen.
Any input on on meth kits?
I actually dropped my shift points down to 6,000 rpm so that I could reduce boost just a tad more. I was shifting 6,200 or so. SO hopefully it pulls it down just a smidgen.
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
Posts: 8,124
Likes: 53
From: Earth, United States
I can't help but be a bit nervous about the 12 lbs though. I was always under the assumption 10lbs was when a person should start getting nervous...
Any input on on meth kits?
Appreciate the input, Sounds like 12 lbs it is.
I actually dropped my shift points down to 6,000 rpm so that I could reduce boost just a tad more. I was shifting 6,200 or so. SO hopefully it pulls it down just a smidgen.
Any input on on meth kits?
Appreciate the input, Sounds like 12 lbs it is.
I actually dropped my shift points down to 6,000 rpm so that I could reduce boost just a tad more. I was shifting 6,200 or so. SO hopefully it pulls it down just a smidgen.
There are guys running north of 15 psi on stock bottom ends. It's almost all about the tuning. Now my personal opinion on that is while it is and has been proven to be doable, I like the added insurance of a forged engine when going over 15 psi. I mean to build an engine with a Callie's compstar forged crank, rods and some weisco pistons isn't a lot of money when you consider the cost of replacing let's say a stock LS6. It's money well spent IMHO.