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Question about the relationship of MPH, RPM, and HP/TQ

  • Thread starter Thread starter Car Nut
  • Start date Start date Oct 18, 2006

Car Nut

Founding Member
Jul 6, 2000
1,176
1
37
Snellville, Georgia (Atlanta area)
Oct 18, 2006
#1
  • Oct 18, 2006
  • #1
What exactly is the relationship between MPH, RPM, and Horsepower/Torque?

For example:

Currently I run 80mph in 5th gear at 2350 RPM (3.55 gears) on a stock motor. What happens if I had 100hp to my motor? With 100hp extra, will I still be doing 80mph in 5th gear at 2350 RPMs?

What about during acceleration, like in a race? If I have 100hp more than I do now, would I reach higher speeds in each gear OR just get through the gears faster without a difference in MPH/RPM?

This may seem basic, but I have just recently thought about this very topic since my "future" motor will likely have 150hp more than stock and torque to match. I will also probably go from 3.55 gears to 3.08 gears with the extra power, because I need to get out of the drone range on interstate trips. Plus, the 3.08 gear will allow for higher speeds and may be more suitable to a 306 with a 2.2L Kenne Bell.

Thanks.
 

reddy351

10 Year Member
Jun 13, 2006
560
12
38
Columbus, Ohio
Oct 18, 2006
#2
  • Oct 18, 2006
  • #2
Yes, the car will still do 80, in 5th gear at 2350 rpm. It will with the same trans and rear-end gear if you make 20hp or 1000hp. You will get through the gears quicker with an extra 100hp. That's the point. I would stick with the 3.55's for a while.
 

Adam95GT

New Member
Aug 14, 2006
2,564
3
0
Burlington, NJ
Oct 18, 2006
#3
  • Oct 18, 2006
  • #3
reddy351 said:
Yes, the car will still do 80, in 5th gear at 2350 rpm. It will with the same trans and rear-end gear if you make 20hp or 1000hp. You will get through the gears quicker with an extra 100hp. That's the point. I would stick with the 3.55's for a while.
Click to expand...




yep... that about said it all
 

Car Nut

Founding Member
Jul 6, 2000
1,176
1
37
Snellville, Georgia (Atlanta area)
Oct 19, 2006
#4
  • Oct 19, 2006
  • #4
Thanks.

For some reason, I was doubting myself and thinking that something would be altered.

Thanks again.
 
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