Hi Tom,
Ed R. seems like a nice guy, but his posts perpetuate a rather common
misconception, namely that acceleration is maximized by shifting to keep the
engine close to its torque peak. In fact, you want to maximize torque at
the rear wheel, after the multiplying effect of the transmission. I don't
have the gear ratios or an S4 torque curve in front of me, but the seat of
my pants tells me I'd do better shifting closer to redline. The difference
isn't great, I think upshifting from 3rd to 4th at 6300 will leave the
engine at about 4500. Maybe I'll do the arithmetic when I get home.
Regards,
Phil
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-----Original Message-----
From: midlman@... [mailto:midlman@...]
Sent: Wednesday, May 24, 2000 3:28 PM
To: PacNW928@...
Subject: [PacNW928] Re: Drag Starts
Hi Phil,
--- In PacNW928@..., "Phil Wilson" <pwilson@a...> wrote:
Anybody have any tips for a 5-spd without limited-slip? Simply
dumping the
clutch high in the power band will really smoke the passenger-side
rear
tire, but probably won't move the car very fast....
By the book, my '87 S4 *ought* to be good for about 14 seconds at
100 MPH.
If true, that should pose the question of whether it's better to
over-rev in
3rd at the end, or risk a shift into 4th. Anybody tried this
before?
Just a thought, the S4 should be making max torque (ft/lbs is what
really counts right!?) at around 3500 rpm. Depending on how close
3rd
and 4th are (ratio?) you may want to shift a little early to keep 4th
at around 3500 to 4000 rpm. How quick can you shift without grinding
;-)??
Anyone with further thoughts on this as I am totally unqualified to
answer this ( but did anyway). Didn't Ed R. describe something
similar on the Rennlist a while back (about shift points and RPM
drops during a DE)?????
Later
Tom
midlman@... 87S4 Auto
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