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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 04-19-2009, 08:42 AM   #1
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Car: 1991 vert camaro
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Loss of power after header install?
I have a 91 vert with a 305 auto. Just installed headers (old slp) Y-pipe and Cat back with not cat. Also removed the A.I.R. system, I have a motor in the works that will take advantage of this this system, but for now I thought this would help the car, but it feels gutless now? Is this just to much of a free flowing exhaust for a 305 TBI system?
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Old 04-19-2009, 12:11 PM   #2
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Re: Loss of power after header install?
I remember there was a noticebly nice power increase when I swapped headers on the stock LO3 (including stock air cleaner).

Best is to check if everithing is set up correctly. Timing, ingnition, vacuum ports and hoses, header gaskets, pullys?, ...
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Old 04-19-2009, 11:33 PM   #3
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Re: Loss of power after header install?
what size pipes?
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Old 04-20-2009, 10:46 PM   #4
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Re: Loss of power after header install?
They are 1 5/8, headers with a four into one type y pipe then 3 in ch cat back, no cat, muffler has 2 2 1/2 tail pipes.
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Old 04-20-2009, 10:54 PM   #5
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Re: Loss of power after header install?
good size. did you remove the smog pulley? I'm trying to think what else that was involved in doing headers.
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