Double de-clutching allows the gears a little time to equalize speeds and
mesh better, providing a quicker change on straight cut gears and less
stress on components. Others may disagree with me, but synchros slow down
your gear change speed in my opinion. As a classic example, I have machined
oil relief's in synchros (conical) in boxes before and this has made the
shift faster as the oil was allowed to escape the surfaces quicker. I have
rallied with a Datto four speed with a straight cut crash 2nd and 3rd and it
was very reliable and very fast shifting with double declutching. Extremely
noisy though.....
I don't see any need to double declutch on the road or with a std box, but I
certainly would if using a box that you want to look after. Just be careful
you practice and GET IT RIGHT as 0.25 second confusion at the feet can cause
a prang, also dyno your car and take note of the torque curves so that you
can analyse your gear changes and change at optimum revs for smooth torque
delivery.
Regards
Brad HALLETT
Proudly Endorsing:
DATRATS
Datsun Dedicated
For Nissan Motorsport Components
Professional Budget Priced competition equipment
http://203.33.35.34
Contact Errol SMITH
mailto:[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of justin darragh
Sent: Thursday, September 07, 2000 10:59 AM
To: [EMAIL PROTECTED]
Subject: heel/ toe,double shuffle Errol/ List
Ferral/ List,
I have been working on various driving tech. and wanted to know if any of
the racers out there could tell me why I need to de-clutch in the heel- toe
double shuffle/ clutch tech.? Going down the gears, why do I need to
de-clutch in neutral, give a rev, re-clutch then engage the lower gear? Why
not just leave the clutch in if I have synchroses?
Thanx
Justin
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