I know this is long shot, but cant find any conclusive answers anywhere. I having a problem shifting into fifth at track with my h22 turbo. It just takes too much time and kills my et. Currently running 23 inch slicks, but I dont think even with 24.5 inch slicks could make a difference. Has anyone tried to put a f22 final drive on the h22 tranny?
thanks

 

Have you tried calculating your 4th gear rpm/ mph with the 24.5s? You can do the same with the f22 fd. There are gearing calculators out there, don't have the urls right now.
Those 23" slicks are too small for a H22 turbo.

 

yeah I did. With 24.5 tires, 8200 rpm gives me 131 mph (last time I trapped 126mph shifting into fifth). The car is making around 500 hp. With the f22 final drive it would give me 138mph which should be good enough I think.