can someone zoom in on 8000 rpm range fo me? I want to see what rpm will fetch me 130mph in third gear and 165mph in 4th for a US 6 speed with a 275/45/r18.Quote:
Originally Posted by aaronatstate
Thanks ahead of time.
Printable View
can someone zoom in on 8000 rpm range fo me? I want to see what rpm will fetch me 130mph in third gear and 165mph in 4th for a US 6 speed with a 275/45/r18.Quote:
Originally Posted by aaronatstate
Thanks ahead of time.
you'd be better off just calculating it
Yep. Do the math. Take the car out. Go to 4000 RPM in 3rd, multiply times two. You have your answer.
I mean you could just plug the gear ratios, final drives, and tire sizes into any of the 1 million gear ratio calculators on the internet, or calculate it by hand with a little bit of math, but that would work too.
hell the formula is even on the page:
http://www.stealth316.com/2-gears.htm
Speed in gear (MPH) = [RPM x tire diameter in inches] / [final gear ratio x 336]
Thanks for inserting the formula... Made things so much easier since I'm using my phone.
My tires are 26.13". Reving to 8000 on USDM
3rd gear (209040/1613.81) = 130 mph
4th gear (209040/1193.81) = 175 mph
Man, fourth gear looks abnormally high. I calc'd 4th gear like 5 times... Seemed inflated but the math works out. That's correct, yes? Sorry guys, long day...
175 looks correct via graph