vortech s trim questions
vortech s trim questions i have a lt1 with a vortech v-2 s trim. I am looking into a forged 383 for it. My question is what pulley set up will i need to run 12 psi and can the s trim even do it on a 383, or do i need to upgrade. I also have an aftercooler, plan on runnin 60# injectors or bigger if needed and a mild blower cam. thanks
I could only get a max of about 8.2# on my SBC 383 with the V-2 S-trim, after a big A2A FMIC and the throttle. That was with good E-tec 200 heads, a solid roller 230/236@.050" (.575/.584 net lash, 112LSA, approx equal to a 222/227 in a hydraulic roller but better), and 1 3/4" longtubes. 60# injectors would be OK, but I recommend going straight to 72's (RC Engineering calls them 75's) so you have some headroom.
On the S-trim, to get that boost I was running an 8-rib setup: 7" lower and the 2.95" upper. I could spin the motor to 6900rpm, but the cam really ran out of steam around 6350.
Jim
My Site: http://home.mindspring.com/~jim_fisk/id1.html
On the S-trim, to get that boost I was running an 8-rib setup: 7" lower and the 2.95" upper. I could spin the motor to 6900rpm, but the cam really ran out of steam around 6350.
Jim
My Site: http://home.mindspring.com/~jim_fisk/id1.html
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First of all, the S and T trim blowers share the same compressor curves, which means they make the same boost when spun the same speed. The T does it a little more efficiently, though.
I ran the T-trim through a water/air on a 383 with AFR 210 heads and a 224/236 cam and it made 13 psi consistently. The pulley combo was the steepest offered by Vortech at the time: 6.66/2.75. At full weight, I ran 10.40's at 133 mph.
Also, a few years ago, LJ ran 9.9 at 139 mph using an S trim on a 383 and 7.00/2.75 pullies. I believe he claimed around 12 psi boost.
I ran the T-trim through a water/air on a 383 with AFR 210 heads and a 224/236 cam and it made 13 psi consistently. The pulley combo was the steepest offered by Vortech at the time: 6.66/2.75. At full weight, I ran 10.40's at 133 mph.
Also, a few years ago, LJ ran 9.9 at 139 mph using an S trim on a 383 and 7.00/2.75 pullies. I believe he claimed around 12 psi boost.
I Have a 2.75 pulley for a V-2 Strim its polished aluminum. I ran a 2.95 and a 7" crank pulley on a 306 and seen 12psi. consistently. Ill sell you the 2.75 if you want it pm me a offer
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ok, so i decided to go with the 2.75 upper and 6.66 lower pulleys on the 383, stock lightly ported heads and long tubes. Now i need some advice on a cam. I have 2 in mind.
choice #1- Comp Cams TS233XR Camshaft 233/242 duration @ .050", .569"/.576" lift with 1.6 rockers, 114lsa. Amazing top end pull, extremely lopey idle in stock displacement engine. Nitrous use 200 shot, supercharger 8-16psi.
choice #2 - Comp Cams TS224XL Camshaft 224/236 duration @ .050", .536"/.555" lift with 1.6 rockers, 114lsa. Nitrous/supercharger camshaft, designed for engines running up to 150 shot N2O, 5-12psi supercharger.
any advice?
choice #1- Comp Cams TS233XR Camshaft 233/242 duration @ .050", .569"/.576" lift with 1.6 rockers, 114lsa. Amazing top end pull, extremely lopey idle in stock displacement engine. Nitrous use 200 shot, supercharger 8-16psi.
choice #2 - Comp Cams TS224XL Camshaft 224/236 duration @ .050", .536"/.555" lift with 1.6 rockers, 114lsa. Nitrous/supercharger camshaft, designed for engines running up to 150 shot N2O, 5-12psi supercharger.
any advice?
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FormerVendor
Joined: Mar 2006
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From: Hell AFB
ok, so i decided to go with the 2.75 upper and 6.66 lower pulleys on the 383, stock lightly ported heads and long tubes. Now i need some advice on a cam. I have 2 in mind.
choice #1- Comp Cams TS233XR Camshaft 233/242 duration @ .050", .569"/.576" lift with 1.6 rockers, 114lsa. Amazing top end pull, extremely lopey idle in stock displacement engine. Nitrous use 200 shot, supercharger 8-16psi.
choice #2 - Comp Cams TS224XL Camshaft 224/236 duration @ .050", .536"/.555" lift with 1.6 rockers, 114lsa. Nitrous/supercharger camshaft, designed for engines running up to 150 shot N2O, 5-12psi supercharger.
any advice?
choice #1- Comp Cams TS233XR Camshaft 233/242 duration @ .050", .569"/.576" lift with 1.6 rockers, 114lsa. Amazing top end pull, extremely lopey idle in stock displacement engine. Nitrous use 200 shot, supercharger 8-16psi.
choice #2 - Comp Cams TS224XL Camshaft 224/236 duration @ .050", .536"/.555" lift with 1.6 rockers, 114lsa. Nitrous/supercharger camshaft, designed for engines running up to 150 shot N2O, 5-12psi supercharger.
any advice?
Something like a 226/230 114 .600 would work well in a street car for a daily driver if chosen to. While you can still run those larger cams, most of the time, its not needed.
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Jake speaks the truth. The centri pulls like crazy up top, so keep that in mind when choosing a cam.
I have the 224/236, but I'm using high lift lobes (.605/.6xx) and it works reasonably well. I urge you to consider a 224/230 or maybe 230/236 for top end. The 233/242 would probably require more rpm than your valvetrain can handle.
I have the 224/236, but I'm using high lift lobes (.605/.6xx) and it works reasonably well. I urge you to consider a 224/230 or maybe 230/236 for top end. The 233/242 would probably require more rpm than your valvetrain can handle.
FormerVendor
Joined: Mar 2006
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From: Hell AFB
Ls1 swap it lol.
