A little RPM/MPH Math

So I just bought a 2016.5 CX5 GT and coming from the performance automotive industry did a little math for anyone interested. This is for 2.5 awd GT as the gearing in both the diffs and transmission as well as tire height are different on other versions. I provided the MPH formula at the bottom so you can play with specs from any vehicle.
I wanted to see the max MPH per gear as well as the RPM drop between gears, shifting at the redline (6500), which is as follows:
1st =34mph
2nd RPM drops to 3700 and pulls to 60mph@6500
3rd RPM drops to 4668 and pulls to 83mph@6500
4th RPM drops to 4477 and pulls to121mph@6500
5th RPM drops to 4602 and pulls to 171mph@6500
6th RPM drops to 5499 and pulls to 202mph@6500
This of coarse if the vehicle was not speed limited...I'm not sure where it cuts off but I assume if it's like most other vehicles it's close to the speed rating of the tires, in this case 149 for the v rated 225/55R19s that are on the vehicle.
I haven't tested this as I don't even have 300 miles on it yet but it works on the race cars so the math is solid.
Formula for MPH at a given RPM:
MPH= RPMXTIRE gear x Trans x 336
MPH= 6500(redline) x 28.9(tire height) 4.624 (diff) x 3.552 (1st gear) x 336
MPH = 187850 5518.61
MPH = 34.03

If you get a tune you can gain around 30/40 hp/tq throughout the powerband.

Aye, well what you need is some salt flats that are quite seriously downhill because it will run out of steam at about 120 despite the fact there is no speed limiter to my knowledge.

I'm pretty sure that there's no need to electronically limit the speed of the CX-5. The thing is so non aerodynamic and the motor lacking in power that the drag is enough to limit the speed.

Chris_Top_Her said:

View attachment 216243
If you get a tune you can gain around 30/40 hp/tq throughout the powerband.

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A tune alone is not likely to give you that gain, what else did you do?

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jasong7131 said:

A tune alone is not likely to give you that gain, what else did you do?

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Click to expand...

Click on his build thread link! A lot of us have done a tune and love it!

The tune alone can net you that. Doesn't mean max output is +30/40