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-   -   RPM and MPH variation (http://www.peachparts.com/shopforum/tech-help/136107-rpm-mph-variation.html)

andmoon 11-03-2005 09:32 AM
RPM and MPH variation
 
My 90 350 sdl will run between 71 and 75 mph at a constant 3000rpm. It isn't a rise and fall but differs from am to pm.
Is there that much slip in th TC or are my guages slacking?
The car runs smoothly and MPG has not changed.

t walgamuth 11-03-2005 09:40 AM
i would suspect the
 
speedo. you could check it by the mile markers.

tom w

tvpierce 11-03-2005 10:20 AM
Quote:
Originally Posted by andmoon
My 90 350 sdl will run between 71 and 75 mph at a constant 3000rpm. It isn't a rise and fall but differs from am to pm.
Is there that much slip in th TC or are my guages slacking?
The car runs smoothly and MPG has not changed.
Are you one flat road (not accending or decending a hill) for both readings?

I see a couple hundred RPM change from cruising a constant 60 mph, to accellerating without a down-shift.

Jeff Pierce

Jim H 11-03-2005 01:13 PM
Quote:
Originally Posted by andmoon
My 90 350 sdl will run between 71 and 75 mph at a constant 3000rpm. It isn't a rise and fall but differs from am to pm.
Is there that much slip in th TC or are my guages slacking?
The car runs smoothly and MPG has not changed.
AM = uphill, PM = downhill? :D

The torque converter never 'locks' like some cars, so you can get 100-200 rpm difference at 70mph, before it changes speed much, by playing with the pedal.

Let us know more...


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