Figuring out my shift rpm by mph?
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From: Skippack, PA
Figuring out my shift rpm by mph? Before my car shiftpoints were around 5600-5700 I figured considering the tach read about 6000 and we know its about 400rpm off at high rpms. Using LT1 Edit you cant change the WOT shift rpm by rpms, you have to do it by mph. Anyways first off I have 3.73's and my car was shifting from 1st to 2nd at 31mph which I think was around 5600-5700rpm. We extended all my shift mph by 10 so now it shifts from 1st to 2nd at 41mph. Anyone know about what rpm my shift points are at now? Its pouring out so I cant take it for a drive and see.
roughly 7500. you increased mph by 33 percent so rpms will be increased 33 percent. these are all rough figures because i dont have a calculator handy and there is always gonna be play with an auto due to the slip in the converter, you can never tell exactly what its gonna do.
Go to the Gears & Axles forum. There is a gear calculator in one of the stickies. You can figure it out by playing with the calculator. Just off the top of my head, I would say you raised it a little too much.
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I just took it out and my rev limiter is set at 6500 and when I got traction I didnt hit the limiter going into 2nd or 3rd but the one time I got on it and spun real hard all the way through first I bounced off of it pretty hard so I suppose Im in the 6300ish area which is where I want to be. I just wish I had a real way to know exactly where Im shifting because I dont want to push the cars limits too much but I need to spin it up pretty high to run the times I want.
If you've got LT1 Edit, I assume you have a way to datalog the car (Datamaster?)- why not just log a WOT run, and see where you're shifting?
Last edited by ecniv; Oct 28, 2007 at 01:55 PM. Reason: 3rd grade grammatical errors.
Thread Starter
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From: Skippack, PA
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11 Second Club
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From: Skippack, PA
