12a carbureted turbo question

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04-13-2006, 01:20 PM

m1cah

Junior Member

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Join Date: Mar 2006

Posts: 11

I was wondering what size CFM Holley 4bbl carb would be appropiate to run on a stock 12a with 7-10 psi?

Thanks,

Micah

okarei@hotmail.com

04-13-2006, 05:53 PM

Racer X

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Join Date: Sep 2002

Location: Vanderhoof,BC(Canada)

Posts: 5,542

Depending on turbo size I would say a 650 and RB manifold should do the trick.I you plan on a big *** turbo the just swap out the jets later on.

04-14-2006, 11:25 AM

BeaterRX7

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Join Date: May 2005

Location: Choctaw, OK

Posts: 178

Quote:

Originally Posted by Racer X' post='813757' date='Apr 13 2006, 05:53 PM

Depending on turbo size I would say a 650 and RB manifold should do the trick.I you plan on a big *** turbo the just swap out the jets later on.

I've never built a turbo setup, but I'm thinking you'd only use a carb that big on a draw-through setup. On a blow-through you'd go with the same size carburetor as stock, right?

04-14-2006, 11:27 AM

12arotaryboy23

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Join Date: Jun 2005

Posts: 69

Atkins sells a 390cfm with their supercharger kits. The smallest there is 6 lbs boost. So it's probably enough. I've got a 390 on mine (no boost) and it sure bogs a hell of a lot less than the 600 I drove a while ago. I've barely tuned mine, either.

To be sure, if you want to go bigger try a 450cfm...

To me, the 650 is overkill, and you may never get it running perfect.

Just an opinion.