The fact that the Tach couldn't catch it is pretty typical. The needles are
usually heavily damped so vibration doesn't give an erroneous reading.
Motorcycles on pavement normally "short shift" in first gear because the
tach can't keep up with the motor.
Tha fact that the rev limiter can't catch it is scary. It should be able to
stop an engine in neutral, let alone wheel slipping.
Simon-Pierre Smith
-----Original Message-----
From: landspeedracer [mailto:landspeedracer@msn.com]
Sent: Friday, December 07, 2001 3:29 PM
To: land speed list
Subject: Traction & Slipage
For all of you discussing suspension and traction control. Here is a little
tidbit. When running the old Chevette several years ago (200 to 230 MPH
range)
I noticed approximately 200 RPM jumps, on my tach, when hitting a bump or
rough area on the salt. After installing a data recorder and playing it back
at a slower speed the actual RPM jumps were really in the 700 to 800 RPM
range. Sometimes past the rev limiter. I was really surprised as an extra
800
RPM could be extremely hard on the engine and drive line. If its happening
on
my car I'm sure it happens on most.
The standard electronic equipment was unable to pick up these large
fluctuations in engine speed. The driver can't see or feel these events (I
mean RPM, the bump you can feel) much less react to the slippage at that
speed.
Even IF traction control was legal it probably would only be allowed in
Special Construction Category anyway. So the rest of us with coupes and
roadsters better find another way.
John Beckett #79
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