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-   -   Perfect shift point? (http://www.jeepgarage.org/f5/perfect-shift-point-29069.html)

dane.p 09-27-2011 09:10 PM

Perfect shift point?
 
What is the perfect shift point?

FlyinRyan 09-27-2011 09:21 PM

Re: Perfect shift point?
 
Assuming youre talking about WOT shift points, the ideal shift point is one that is the best compromise of where power peaks, power at the shift recovery point , and also valvetrain limitations. Shift recovery point will be a function of gearing, converter slip, and what rpm you shift at itself.

You can get a feel for where it needs to be if you know your powercurve and do some mathwork, but in my experience it is best verified at the track.

dane.p 09-27-2011 09:24 PM

Re: Perfect shift point?
 
My jeep over revs so bad, so I was just wondering if I shift before it hits 2500rpm or 3000rpm, will it save gas or will it waste gas?

FlyinRyan 09-27-2011 09:43 PM

Re: Perfect shift point?
 
Quote:

Originally Posted by dane.p (Post 491049)
My jeep over revs so bad, so I was just wondering if I shift before it hits 2500rpm or 3000rpm, will it save gas or will it waste gas?

You have an auto trans. Unless you have major modifications and the stock shift points don't cut it, or are towing, its best to leave it in D.

Gas mileage cannot simply be based on rpm, although rpm plays into it. Its a function of load, rpm, and vacuum.

The 3.7s and 4.7s tend to wind up some before shifting so as to offset their lack of low end torque.

HEMI57 09-28-2011 06:08 AM

Re: Perfect shift point?
 
if you want lower RPM shifts, I'd recommend the HEMI

dane.p 09-28-2011 02:37 PM

Re: Perfect shift point?
 
Dooooood I want one so bad but no cigar


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