Vacuum Gauge Tuning - Team Camaro Tech
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post #1 of 6 (permalink) Old Feb 13th, 07, 01:14 PM Thread Starter
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Vacuum Gauge Tuning

So I fired my 383 (GM 962 cam, edelbrock heads) with the modified LT1 intake, made sure everything was OK, adjusted the timing (computer controlled), fuel map, readjusted the rockers, etc. I was slightly concerned that the modified LT1 intake wouldn't seal, so I have been checking and rechecking everything to make sure that I don't have a vacuum or coolant leak.

I ran it yesterday and hooked up a vacuum gauge, got a perfectly steady 14-15 inches (which is what it had when I ran a QJet) at a steady 700 RPM idle. I guess a steady idle and vacuum gauge reading verifies no vacuum leak and correctly adjusted rockers huh? I guess I should move onto something else and stop "over thinking" the engine tune?

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Last edited by paulm; Feb 13th, 07 at 01:35 PM.
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post #2 of 6 (permalink) Old Feb 13th, 07, 01:22 PM
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Re: Vacuum Gauge Tuning

Hey Paul, look this page over, it will give you that warm and fuzzy you are looking for...

http://www.centuryperformance.com/vacuum.asp

...Dennis

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post #3 of 6 (permalink) Old Feb 13th, 07, 01:29 PM
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Re: Vacuum Gauge Tuning

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Originally Posted by paulm View Post
So I fired my 383 (GM 962 cam,
I ran it yesterday and hooked up a vacuum gauge, got a perfectly steady 14-15 inches (which is what it had when I ran a QJet) at a steady 700 RPM idle.
When I ran the same cam w/Q-jet & Holley 3310, 900 rpm w/16 in./Hg.

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post #4 of 6 (permalink) Old Feb 13th, 07, 01:36 PM Thread Starter
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Re: Vacuum Gauge Tuning

Thanks guys!

So why did you set the idle to 900 RPM? That seems a little high?

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post #5 of 6 (permalink) Old Feb 13th, 07, 03:20 PM
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Re: Vacuum Gauge Tuning

The engine worked better there when setting at the starting line at idle and nailing the throttle to WOT to take advantage of the looser convertor.

Plus, it had another inch and a half of vacuum than at 750 rpm. Better response from the engine.

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post #6 of 6 (permalink) Old Feb 13th, 07, 03:22 PM Thread Starter
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Re: Vacuum Gauge Tuning

Cool, so 14-15 sounds about right at 700 RPM huh?

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