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403 and D1SC Pulley combo for 12 psi.....

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Old Aug 21, 2008 | 07:53 PM
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Default 403 and D1SC Pulley combo for 12 psi.....

I have a D1SC and was looking for a pulley combo with the SDCE set-up that would get me in the 12 psi mark, erroring on the high side, as I don't want to change it if not necessary in the immediate future and want to hit my goals right out of the gate.

I know there are lots of variables but surely someone has run similar parts as this is a fairly common build.

403, AFR 225, 9.5:1, 232/240 @ .050 115 lsa in at 0, 1 7/8 tubes, catted Y and Magnaflow rear cat back. I am also using the twin 4.5"s coolers and the FAST 90/90 set-up with the BIG air filter and stock plastic ATI hat.

I have a 7.250" crank and a 3.55 and 3.70 supercharger pulley to play with. Engine RPM will be 6300-6500 tops.

thanks
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Old Aug 22, 2008 | 04:45 AM
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Originally Posted by helicoil
I have a D1SC and was looking for a pulley combo with the SDCE set-up that would get me in the 12 psi mark, erroring on the high side, as I don't want to change it if not necessary in the immediate future and want to hit my goals right out of the gate.

I know there are lots of variables but surely someone has run similar parts as this is a fairly common build.

403, AFR 225, 9.5:1, 232/240 @ .050 115 lsa in at 0, 1 7/8 tubes, catted Y and Magnaflow rear cat back. I am also using the twin 4.5"s coolers and the FAST 90/90 set-up with the BIG air filter and stock plastic ATI hat.

I have a 7.250" crank and a 3.55 and 3.70 supercharger pulley to play with. Engine RPM will be 6300-6500 tops.

thanks
KP might be able to nail this one down for you, as he has used the SDCE bracket assembly for many years. I would say it will take the 3.55 with your mods. Bob
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Old Aug 22, 2008 | 06:48 AM
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Thanks Bob, I thought that might be the one.
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Old Dec 9, 2008 | 03:50 AM
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I'm running 3.45 blower pulley and saw a max of 10.5 with some belt slip at the higher rpm's.

Running almost same setup as you except LS6 intake.
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Old Dec 9, 2008 | 01:06 PM
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Yeah with my set-up and the 3.55 (heads, cam, exhaust, etc.) and no slip, I seem to be making 9#
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Old Dec 9, 2008 | 01:41 PM
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the SDCE has a smaller crank pully though so you will have to go even smaller on the blower pulley.
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Old Dec 9, 2008 | 08:56 PM
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by the calculations, assuming the graph of flow vs rpm is linear, you should see 8.75 psi but that is very dependant on your particular setup
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Old Dec 9, 2008 | 08:57 PM
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that was with the 3.55 pully
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Old Dec 10, 2008 | 08:59 PM
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Well, I got 9 with the 3.55, so that is pretty darn close. How did you figure it?
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Old Dec 10, 2008 | 09:22 PM
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Listen to Bob he knows what he's talking about........
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