408 roots blower build
#122
Launching!
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Join Date: Jan 2008
Location: MN
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Well I'd like thank everyone for all the advice. We had a successful night on the dyno. Dropping the boost to 9 psi and putting the Holley coils on. I tried to gap the plugs at .020 but kept blowing out cylinders. Talked with Holley and they said to gap at .030. First pull I made like 820hp @ 6,500 and 709ftlbs tq @ 5,100 rpm. So about 100 hp gain by plug gap and coils. I guess someone was correct that stock ls coils don't work with Holley system. At the end of the day with richening the engine and raising the timing I made a peak of 843hp @ 6,500 and still climbing but we stopped there and 749tq @5,200 rpm on 9 lbs of boost. The engine was still making tq with each timing change but just ran out of time. Overall I'm happy now. Thanks again for the help and advice.
#130
11 Second Hall Moniter
iTrader: (22)
And now all the hard work & hard earned cash is starting to pay off!! Those are good numbers, and I'd bet there's quite a good bit more in it at 9 psi. I can't wait to find out what happens when you decide to turn up the boost.
Looking forward to reading more about this project.
Looking forward to reading more about this project.