Blowing thru the converter ?

[434nova]

What is signs of this ? Will it cause the motor not to rev or will it rev fast and not have any mph ? Thanks

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[Chuck Leeper]

One good sign is .... The rpm drop on the shift will be low. IE: Shift @ 5000, and the rpm drops 200.
Another is to compare the mph, vs gear ratios, tire size, engine rpm.
If the mph does not come to the calculated speed, then there's a couple things that could be causing it.
A. The converter is the cause.
B. The trans is slipping.
C. You are spinning the tires.

http://www.tciauto.com/tc/racing-calculators/

 

[Bescurred]

Chuck what's a "normal" rpm drop?

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[bison]

Rpm drop doesn't indicate a problem with a converter. I've raced with 200-300rpm drop and still not driven through the converter. Use ds speed vs engine speed to determine converter slip. If all is good it will be down in the 5-7% range at the end of a pass at 1:1 typically


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[Dusty Bradford]

The rpm will go up and just sorta hang there. Use the calculator to figure slip and see what it is.

In most cases rpm drop is a good way to tell what a converter does but the Buick isn't one of those cases. Some shift at a very low rpm which creates a very low rpm drop. Shift at 5200 and it drops to 4900 but slip is not much worse than shifting at 5800 rpm and drops to 4900.


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