Revs at 60 mph?
Drifting
Joined: Nov 2013
Posts: 1,572
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From: Loud, Raw and Dangerous 1968 327 4S in Southern California
Here is a calculator that is fun to play around with.... https://spicerparts.com/calculators/...rpm-calculator
Redvette2
Redvette2
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
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I'm at 3700 at 80 for about an hour most weekends.Most shows or the beach are up the highway. ITs how they were built to run back in the day. Kinda loud, kinda uses more fuel than it should, but REALLY fun. Its not going to blow up but it wears on the motor a bit. If it really bothers you its time for a 5 or 6 speed. Its the only option other than parking it.
Enjoy it while you can
Enjoy it while you can
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Instructor
Joined: Mar 2019
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I'm at 3700 at 80 for about an hour most weekends.Most shows or the beach are up the highway. ITs how they were built to run back in the day. Kinda loud, kinda uses more fuel than it should, but REALLY fun. Its not going to blow up but it wears on the motor a bit. If it really bothers you its time for a 5 or 6 speed. Its the only option other than parking it.
Enjoy it while you can
Enjoy it while you can
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Running at 3000 rpm (or higher) on the highway is not a functional problem....but it does wear the engine more than if it were turning 2000 revs. That's the main reason I installed an overdrive transmission....to save the engine--and to make life more comfortable inside the cockpit during longer highway rides.
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Thread Starter
Instructor
Joined: Mar 2019
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Running at 3000 rpm (or higher) on the highway is not a functional problem....but it does wear the engine more than if it were turning 2000 revs. That's the main reason I installed an overdrive transmission....to save the engine--and to make life more comfortable inside the cockpit during longer highway rides.
Le Mans Master
Joined: Oct 2005
Posts: 6,247
Likes: 471
From: Glen Allen, VA
I'd be willing to bet you're used to only modern vehicles with overdrive transmissions, so you're not used to a vehicle having so many rpms on the highway. On the highway in my 79 im typically between 3500 and 4000 rpms for hours. As others have said, maybe not the most ideal situation, but it is what it is. For the record, you can install and overdrive trans in your car without any permanent modifications, so it's completely reversible to stock if you were so inclined.
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Instructor
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I'd be willing to bet you're used to only modern vehicles with overdrive transmissions, so you're not used to a vehicle having so many rpms on the highway. On the highway in my 79 im typically between 3500 and 4000 rpms for hours. As others have said, maybe not the most ideal situation, but it is what it is. For the record, you can install and overdrive trans in your car without any permanent modifications, so it's completely reversible to stock if you were so inclined.
I baby my Vette as it's almost 50 years old but forget its actually a sports/muscle car at the end of the day.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,221
Likes: 9,356
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
You should go out and give it a good ride above 3000 every shift just to let it knows you care. They actually like it a little rough.....
if you like that try 4000 rpm...you'll be surprised how a middle aged car can still perform
if you like that try 4000 rpm...you'll be surprised how a middle aged car can still perform
Last edited by Rescue Rogers; Jul 23, 2019 at 08:11 PM.
Drifting
Joined: Nov 2013
Posts: 1,572
Likes: 486
From: Loud, Raw and Dangerous 1968 327 4S in Southern California
FYI...70 MPH is 2830 RPM's for my 1968. Has 3.08 ring and pinion, 4S with 1:1 fourth gear ratio and 25.6 inch diameter tires. If it really bothers you change the rear diff gearing to a lower number ratio however taking off smoothly in first will more difficult.
Redvette2
Redvette2
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FYI...70 MPH is 2830 RPM's for my 1968. Has 3.08 ring and pinion, 4S with 1:1 fourth gear ratio and 25.6 inch diameter tires. If it really bothers you change the rear diff gearing to a lower number ratio however taking off smoothly in first will more difficult.
Redvette2
Redvette2
Thread Starter
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I havent taken it over 4000 rpm but it certainly has some power with 375hp. Just very different than modern car power. Cheers
Melting Slicks
Joined: Oct 2008
Posts: 2,154
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From: Regina Sk Canada
With 3.55 gears and a 27" tall tire. 255/60/15. 60 mph = 2900 rpm and 100 mph = 4500 tack is out 200 rpm i need to hang my timing light on there again and see which way its out i forget.
Drifting
Joined: Nov 2013
Posts: 1,572
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From: Loud, Raw and Dangerous 1968 327 4S in Southern California
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Burning Brakes
Joined: Aug 2006
Posts: 793
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From: Grafton MA
I had my '71 LT-1 on the highway this past weekend (which i don't do too often) and was noticing the RPMs. I wish i read this thread first so i could have made specific note of it, but IIRC i was running about 3000 rpm driving between 60 and 70 mpm. The car has a 3.55 rear end so sounds about right.
