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Old 10-07-2010, 11:12 AM   #1
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how do i turn up my boost?

okay i have a jackson racing supercharger in my 02 svt and the guy before me had it at 11 and now it running 6 after he gave it to me.....how do i turn it up? i have the computer but i dont think that helps....sorry im new to this im only 17 so dont hate


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Old 10-07-2010, 11:29 AM   #2
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Superchargers make a set amount of boost based upon the pulley size on their snout. Now, since your boost has decreased by 5psi, that indicates a problem, perhaps. I see you live in the hiiiigh up city of Colorado Springs. Did you pick up the car in a much lower altitude? High altitude prevents a supercharger from making full boost because of how thin the air is. If you got the car IN C Springs and it went down 5psi and you haven't added a bigger exhaust or anything, then you have a problem. ECU tuning doesn't affect how much boost you make, for the most part.
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Old 10-07-2010, 03:28 PM   #3
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maybe the previous owner had a different pulley on it but removed it prior to selling?
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Old 10-07-2010, 03:58 PM   #4
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well i bought it from a guy in the springs, and he had a 10lb pully and he didnt take it off....so there is problem?
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Old 10-07-2010, 05:25 PM   #5
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Well...did you ever actually see his boost gauge go to 10psi or did he tell you it was supposed to? Granted, even at that altitude, it shouldn't drop 4psi. Does the car run rough? Only thing I can think of is something either wrong with your valves or a boost leak at the intake manifold.
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Old 10-07-2010, 06:36 PM   #6
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How are you driving the car? You will not reach full boost untill 7,000 RPMS which would be around 9-10 PSI for a jackson racing + pulley.

Just driving it around and driving semi hard you will only see an instant 5psi +... your psi will rise the further your RPMs go UP.
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Old 10-07-2010, 07:12 PM   #7
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bouncing off what they said, the jrsc i have on mine is set up for 6lbs, which i believe is the stock(jrsc) boost level. the 10 is alot for a stock engine. but it sounds like its just the factory pulley
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Old 10-07-2010, 07:35 PM   #8
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Quote:
Originally Posted by horsePOOGAS View Post
How are you driving the car? You will not reach full boost untill 7,000 RPMS which would be around 9-10 PSI for a jackson racing + pulley.

Just driving it around and driving semi hard you will only see an instant 5psi +... your psi will rise the further your RPMs go UP.
Nope. Roots style blowers are meant to make full boost right off idle. That's why they're called positive displacement...they make your motor "act bigger" all the time. Centrifugal blowers build boost the closer you get to red line, though.
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Old 10-07-2010, 09:23 PM   #9
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cant you tell the difference in the pullies by the color. arent the bbk pulleys blue. it has been years since i had a jrsc so i dont remember. but i do know you can measure the pulley diameter and that will tell you for sure. also check to see if you have any dust on the pulleys from belt slippage.
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Old 10-08-2010, 04:38 AM   #10
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Quote:
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Nope. Roots style blowers are meant to make full boost right off idle. That's why they're called positive displacement...they make your motor "act bigger" all the time. Centrifugal blowers build boost the closer you get to red line, though.


yes with the JRSC you do make 5 psi off idle (running hard). But I'm pretty sure with the BBK you will not make 9-10 psi until redline....mine didn't at least
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