low boost d1sc

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Dec 30, 2014 | 12:55 PM

crispytoast

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low boost d1sc

I currently have a 3.4 head unit pulley and a 7.5 crank pulley which should put my blower spinning about 66000 rpm at 6700 engine rpm. I have verified that I have no leaks and no belt slip but I am only making 11# of boost. Right now I have a big red valve is it possible that the valve needs adjustment? I am at about 5000 ft elevation right now and I know that will have some effect but there are other d1 cars here that make 18 #. Another thing that might have something to do with it is the 6 degrees of overlap on my cam?
Background: ls1 with ls6 heads, 102 intake, 228/232 on 112

Dec 30, 2014 | 12:58 PM

2002kirk

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The red valve probably needs to be adjusted. That was an issue on my friends corvette with his set up. And the elevation is against you. And the cam, I can't give you any help on that. Idk but that much over lap isn't much

Dec 30, 2014 | 01:00 PM

crispytoast

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Which way should the valve be adjusted and how much?

Dec 30, 2014 | 01:02 PM

2002kirk

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How to adjust it I'm insure of. The only reason I could help him figure it out. Is because I heard it blowing off boost. So I would say it needed to be tightened.

Jan 1, 2015 | 07:32 AM

Bob@BruteSpeed

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Quote:

Originally Posted by crispytoast

Between your elevation and your overlap, I'd say you don't have any boost leaks. At 5000 ft you're not going to make a lot of boost with a D-1SC. The only way someone there is making 18 psi with a D-1SC is with clogged cats, or on a very small displacement engine. A D-1SC at 900 ft on an LS1 with a cam and headers is doing well to make 16 psi. Bob

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Jan 1, 2015 | 10:12 AM

crispytoast

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Quote:

Originally Posted by Bob@BruteSpeed

Guess i need to start saving my pennies for an f1

Jan 1, 2015 | 10:15 AM

Bob@BruteSpeed

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Quote:

Originally Posted by crispytoast

Guess i need to start saving my pennies for an f1

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