Classic Mustangs List Archive

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Mail From: ckelly (Chris Kelly)

I'd agree with all that. Auto transmissions will last longer if keep below
200F, which is easy to do with an external cooler. My racing trans hits
maybe 200~220 at the end of a run and that's with a few hundred RPM of slip
on the top end. Makes a lot of heat. At the same time, I like to have it
over 160 before going to staging. Controlling the temp makes the car more
consistent and reduces the tendency for the first time trial to be more of a
warm up than a calibrating pass. If the trans is cold, it makes about .02
difference in ET.



Side note - most of the trans' that run the "exotic" fluids have some kind
of Kevlar in them and Kevlar apparently has more slip that other friction
materials. That generates heat and the heavy fluids like tractor fluid and
Mobil 1 handle that better. I use normal performance clutch material (Alto
red), stock rear band and a carbon, welded front band. I use normal Type F
fluid and have to visit the inside of the trans maybe every 300~400 passes.
It's the direct clutch (high) that gets the beating,



=====================================
Chris Kelly - ckelly at raceabilene.com
raceabilene.net/kelly/hotrod
Merkel, Texas
Member:
International Hot Rod Association
Abilene Performance Car Association
Falcon Club of America
=====================================

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