*How-To* Calculate RPM Landing after Upshift
 

Chris was wondering about this at DimSum if when he shifts, does he land in vtec. Bryan, Fuzzy, Mike and I were also talking briefly about it.

What you need to know is the Gear Ratio's for each gear and it depends at what rpm you shift at.

You can find the gear ratio's for tegs and civic's here.
http://www.team-integra.net/sections...0df7e7955b.jpg

Formula

1st -> 2nd : rpm you shift at or redline x (2nd gear ratio/1st gear ratio) = landing rpm in second gear
2nd -> 3rd : rpm you shift at or redline x (3rd gear ratio/2nd gear ratio) = landing rpm in 3rd gear
3rd -> 4th : rpm you shift at or redline x (4th gear ratio/3rd gear ratio) = landing rpm in 4th gear
4th -> 5th : rpm you shift at or redline x (5th gear ratio/4th gear ratio) = landing rpm in 5th gear


Here's a example that I made up below. BTW I rounded the number to nearest 100rpm.

ITR Tranny 96-97 Spec
1st Gear Ratio 3.230
2nd Gear Ratio 2.105
3rd Gear Ratio 1.458
4th Gear Ratio 1.107
5th Gear Ratio 0.848
Final Gear 4.400
Redline (RPM) 9200

9000 Redline

1st -> 2nd : 9000 x (2.105/3.230) = 5800 rpm
2nd -> 3rd : 9000 x (1.458/2.105) = 6200 rpm
3rd -> 4th : 9000 x (1.107/1.458) = 6800 rpm
4th -> 5th : 9000 x (0.848/1.107) = 6900 rpm

Notice the final drive has nothing to do with what rpm you land at when you upshift. Hope that clears up some of the confusion.

Enjoy!

If anyone is having problems figuring it out for there car, post or pm me and I'll help you out.

is rpm landing after upshift affected by a lighter flywheel?

also, is it affected by how fast you shift? like if you shift at redline like a mofo compaired to shifting at redline like a turtle.

Nope


The main difference for with the flywheel is that you just gotta shift faster, compared to stock, the landing is still the same.

hey ..trenell can u do the calculation for stock B18B with stock tranny ?

94-01 LS/GS/RS/SE
1st Gear Ratio 3.230
2nd Gear Ratio 1.900
3rd Gear Ratio 1.269
4th Gear Ratio 0.966
5th Gear Ratio 0.714
Final Gear 4.266
Redline (RPM) 6800

1st -> 2nd : 6800rpm x (1.900/3.230) = 4000rpm
2nd -> 3rd : 6800rpm x (1.269/1.900) = 4500rpm
3rd -> 4th : 6800rpm x (0.966/1.269) = 5200rpm
4th -> 5th : 6800rpm x (0.714/0.966) = 5000rpm

thankz trenel ..sum good info