Motorsports Village

Weird Manifold vacuum traces
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Author:  fourtenposi [ Mon Feb 04, 2013 9:24 pm ]
Post subject:  Weird Manifold vacuum traces

Hey All,

When I made my 1/4 mile passes, I noticed some weird manifold vacuum traces. It may be a logger issue, but basically what I am seeing is manifold peaking at the top of first gear at 7000 rpms at 1.67, than on the shift, rpm drops to 6000 and rises to about 1.57 at 7000 and stays there all the way up to 7800.

So I am thinking maybe my airpan is providing a little ram air effect? Any thoughts?

Author:  treyrags [ Tue Feb 05, 2013 4:44 pm ]
Post subject:  Re: Weird Manifold vacuum traces

Yes, my vacuum logs do the same. Slightly less vacuum at top of high gear than top of 2nd at same rpm. I have a sealed scoop as well. My last one was 1.09" @ 6000 in second and .97" @ 6000 in high.

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