What affects RPMs?

Jul 04, 2005 7 Replies
K

I've been noticing that my RPMs can differ as much as 300RPMs at the same speed... why is that?



And it doesn't seem like T-tops on or off is a factor...



Went on a trip yesterday... 340 miles one way with the t-tops off and the windows down.. made 28.6 MPG... came back the same trip windows up and t-tops on made 27.8 MPG... weird



I noticed going up at 70, RPMs were 2200... but on the way back at 70 it was at 2500+. I thought that was weird. Any thoughts?


-Geno



1985 Blue Camaro 2.8L auto w/T-tops (aka "Tazmaro")
1988 Blue Firebird Formula 5.0L auto w/T-tops
1985 Brown Firebird 5.7L (360) 5-speed NO T-tops (still looking for an '82 Black T/A w/T-tops)
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T

It wasn't uphill coming back was it ?

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D

Sounds like the torque converter isn't always locking up.

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T

LT-1 with a 6-speed - 2500 rpm in 6th will get you about 100. 2000 is

6th is worth a shade less than 80.

Tom

97 Formula Convertible, Red LT-1 w/6 speed
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S

A tail-wind versus a head-wind?

I know thirdgen f-bodies have decent aerodynamics even by today's standards but that's got to make a difference.

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K

Lol.. no.. I was noticing it the whole way... and it was the exact same trip... mostly flat roads...

-Geno

1985 Blue Camaro 2.8L auto w/T-tops (aka "Tazmaro") 1988 Blue Firebird Formula 5.0L auto w/T-tops 1985 Brown Firebird 5.7L (360) 5-speed NO T-tops (still looking for an '82 Black T/A w/T-tops)
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U

I'd say your lock up torque converter isn't always doing it's job.

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