In a message dated 6/22/2002 7:05:31 PM Pacific Daylight Time,
saltracer@hotmail.com writes:
> Thanks so much for the accumulated advice on our timing on the flathead. We
> went to a local drag strip today for some test and tune and the car runs
> strong, but we have a problem with the 2-3 upshift on the C4 automatic. It
> doesn't shift right away and will let the engine rev quite a bit before
>
Phil,
What's been done to modify the tranny? I presume that it still has the
stock valve-body? I use manual valve-body (driver makes all shifts) C-4's in
both my LSR and drag cars, so I don't have any hands-on knowledge of the
stock C-4 shift points.
I do believe however that on a stock C-4 the shift points are controlled
by vacuum from the intake manifold, and possibly also from centrifugal input.
In a multiple carb setup or IR injectors the manifold vacuum would be either
low or non- existent, depriving the tranny of it's shift-point sense or
giving it the "low vacuum" signal that full throttle gives, delaying the 2-3
shift.
I'm just guessing. Hopefully someone with experience can enlighten us.
Perhaps Tom Bryant can enlighten us. He deals with stock tranny's in his
everyday business.......Ardun Doug king
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