Vortech S-trim Pulleys
07-14-2004, 10:06 AM
#3
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Join Date: Oct 2001
Location: Bay Area, CA, USA
Posts: 311
Boost and the hp depend a lot on your flow and over system setup. A really rough estimate is something like 20rwhp per lb of boost, but don't hold me to that number.
For 9-10#, I would think it will probably need something like a 3.125" sc pulley. WIth the increase in boost you will need to make sure you put in more fuel. If it is a stock motor, I will highly suggest making sure the car is dyno tuned and maybe add in an aftercooler or something in that line.
The new 2.95" pulley for $50 is a good price, but may give you a lot more boost than you are looking for.
For 9-10#, I would think it will probably need something like a 3.125" sc pulley. WIth the increase in boost you will need to make sure you put in more fuel. If it is a stock motor, I will highly suggest making sure the car is dyno tuned and maybe add in an aftercooler or something in that line.
The new 2.95" pulley for $50 is a good price, but may give you a lot more boost than you are looking for.
07-14-2004, 02:07 PM
#4
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Location: utah
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I have a vortech aftercooler, walbro high volume fuel pump. My s-trim only puts out 4 or 5# right now because of 4200 ft elevation. I also have hard intake pipe and headers and exhaust. Does anyone know how much boost the 2.95" pulley makes on the s-trim??
07-17-2004, 09:09 AM
#6
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Join Date: Dec 1969
Location: Calgary, Alberta, Canada
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Originally posted by 96Z28/93TA
I have a vortech aftercooler, walbro high volume fuel pump. My s-trim only puts out 4 or 5# right now because of 4200 ft elevation. I also have hard intake pipe and headers and exhaust. Does anyone know how much boost the 2.95" pulley makes on the s-trim??
I have a vortech aftercooler, walbro high volume fuel pump. My s-trim only puts out 4 or 5# right now because of 4200 ft elevation. I also have hard intake pipe and headers and exhaust. Does anyone know how much boost the 2.95" pulley makes on the s-trim??
Hope that helps
LWM
07-19-2004, 06:30 PM
#8
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Location: Calgary, Alberta, Canada
Posts: 324
Re: Vortech S-trim Pulleys
Originally Posted by 96Z28/93TA
LMW...did you see a big gain in power with the 11psi boost compared to stock s-trim boost?
When you pulley up, the boost comes on sooner and so you notice it more. Lots more torque in the sweet spot of the power band ... 4,000 rpm
Hope this helps
LWM
07-22-2004, 06:25 PM
#10
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Join Date: Dec 1969
Location: Calgary, Alberta, Canada
Posts: 324
Re: Vortech S-trim Pulleys
Originally Posted by 96Z28/93TA
how many miles did your LT1 last before it blew up on 11psi? thanks for the help
I finally rebuilt it after 15,000 miles to increase the displacement to 383.
No visible damage to the engine at all.
Hope this helps
LWM
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