Larry,
It's interesting that this kind of mis-information is so pervasive. The
torque curve is definitely not what you want to use to pick the shift
points, although there seems to be a fair number of people out there that
seem to believe it. There are computer programs that will compute quarter
mile times based on your dyno data, car weight, gears, etc. They all use the
right physics as far as I know. However, a lot of "seat of the pants" racers
seem to have lost the rabbit.
Bob
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net]On
Behalf Of Fraser, Ron
Sent: Wednesday, February 21, 2001 8:18 AM
To: tigers@autox.team.net
Subject: RE: E-Mail me off the list
Larry
I'm not sure about the 80% part but I did see an explanation about
shift points.
You need to look at your engine's Torque Curve and you need to know
what the RPM change is for each of your transmission gears. The idea was to
shift at an RPM after peak torque that would bring you to that same torque
value before peak torque. This uses the Max Torque of the engine to propel
the car. This seems to make sense but I do not know if will get you down
the track any faster. I have never drag raced, only short bursts on the
street, so I'm no expert.
Ron Fraser
-----Original Message-----
From: Larry Paulick [mailto:larry.p@erols.com]
Sent: Wednesday, February 21, 2001 8:58 AM
To: Bob Palmer
Cc: cvaught@hawaii.rr.com; tigers@autox.team.net
Subject: Re: E-Mail me off the list
Bob, interesting point on the shift points. I understand having the
revs in the sweet spot, but how did the 80% come about.
If I have the stock motor and cam from the 90 5.0L, and its max hp is at
5200 rpm, the the shift point is 6500 rpm. That is quit a jump, and
with stock valve train, mainly springs, I am sure that valve float would
become a problem.
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