Do my RPMs seem right?
Thread Starter
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Tuned
Joined: Aug 2011
Posts: 282
Likes: 2
Do my RPMs seem right?
I'm running about 2600rpms @ 55mph. It sounds pretty wound out and runs out of power while towing. (Part of this might be my kickdown linkage isn't set up correctly.) Just wondering if this sounds reasonable for RPMs. Here are my specs:
C6
4:10 gears
33" Tires
Thoughts?
C6
4:10 gears
33" Tires
Thoughts?
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
With the numbers you gave you should be spinning about 2,300 rpms @55 mph...
The difference can probably be attributed to T/C slippage and the fact you're running bigger than stock tires which throw off your speedo.
The difference can probably be attributed to T/C slippage and the fact you're running bigger than stock tires which throw off your speedo.
Thread Starter
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Tuned
Joined: Aug 2011
Posts: 282
Likes: 2
Sounds like I'm at least in the range I should be. I'll check the GPS on my phone and see how accurate the speedo is. Very possible I was going faster than I suspected. Pulling 7000lbs it was about as much as I felt comfortable doing....
Logistics Pro
Joined: Feb 2000
Posts: 3,955
Likes: 50
From: Mesa
4.10 gears, 33" tires, 2600rpms = 62.28mph
4.10 gears, 33" tires, 2320rpms = 55.57mph
You can either remember and drive by rpms or change the gear on the speedo cable
4.10 gears, 33" tires, 2320rpms = 55.57mph
You can either remember and drive by rpms or change the gear on the speedo cable
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Senior User
Joined: Jan 2013
Posts: 210
Likes: 0
From: New Mexico
[QUOTE=wotan;13684522]I'm running about 2600rpms @ 55mph. It sounds pretty wound out and runs out of power while towing. (Part of this might be my kickdown linkage isn't set up correctly.) Just wondering if this sounds reasonable for RPMs. Here are my specs:
C6
4:10 gears
33" Tires
I have the same setup except I have a np435, and im running 3000 at 60 and probably about 2600 at 55. What motor do you have? I have the 390 and itll go as fast as i want without a load but i could have 2000 or 8000 pounds and it wont go over 55
C6
4:10 gears
33" Tires
I have the same setup except I have a np435, and im running 3000 at 60 and probably about 2600 at 55. What motor do you have? I have the 390 and itll go as fast as i want without a load but i could have 2000 or 8000 pounds and it wont go over 55
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