Wildncrazy

I like the concept of not turning 4,000 plus rpms when cruising down the hwy. Obviously I cruise at a higher speed than 60

street_ruler

i do too, i was honestly thinking of going to a 3.90 rear end and running a 255/50 tire to even further lengthen the final drive

S2K2GO!!

I hear ya'!

Still, happy-engine cruise revs depend on a lot of factors. My sense with the F20 has always been that when you are under 4K for extended periods, you'd better not have much foot on the throttle.

Admittedly, this is exactly the opposite of the strategy that would give the best gas mileage, but I'm willing to sacrifice a little gas to keep my engine alive and well.

supahman04

Well I drive about 70 miles a day, 60 of which are highway miles. And my AP1 tranny is making ungodly noises that sound too loud to be clutch buzz and I was considering an AP2 tranny.

And since there isnt too much difference in price used it's sounding like it might be the best be anyhow. 70 rpm difference isnt too bad.

NikosX

The biggest problem is that when you swap the AP2 transmission, the speedometer on the AP1 will read high, thus giving the illusion that the RPMS are lower than they actually are.

Im fairly certain that 1-4 are shorter and 5 and 6 remain the same.

S2K2GO!!

[QUOTE]

This is exactly what I'm experiencing and I think you will find the reason here:

https://www.s2ki.com/forums/index.php?showtopic=409603

Something tells me that there are lots of these failures coming down the pike as miles pile up on these cars- I do not know if any changes have been made to insure adequate lubrication of these bearings in later transmissions. I hope to learn more. I just bought a low-time AP2 from s2ki member David Goatley and I know he has a couple more AP2's available. Great working with Dave so far, I can't wait for the new tranny to arrive. - Otis

S2K2GO!!

Thanks for the tip about the speedo- Mine already reads a bit high according to my GPS. Does this mean I'll be less likely to get speeding tickets?

As for the ratios- I'm afraid the numbers don't lie. It is unfortunate that Honda does not simply report the net ratios of the entire transmission assembly. It would be a lot less confusing.

I'd better shut up before people start throwing 's at me- otis

S2K2GO!!!

An afterthought.(apologies for overstating the obvious)

Looking at the "spreads" listed in the first post of this thread, You might ask why each is MUCH smaller than the one before. The answer is total drag vs. speed.

If drag did not increase with speed, you could leave all the spreads the same, and even add 7th, 8th, 9th, etc. gears. This little engine would just keep on accelerating the car at the same rate forever.

As you go faster, more and more engine output is required to overcome total drag(friction+rolling resistance+aerodynamic drag). Gear changes have to get smaller and smaller as surplus power for continued accelerating diminishes until, by sixth, you can no longer even reach redline. When that happens, total drag= total available power

NikosX

Well... I have hit 8k in 6th with the AP2 trans. Approximately 155mph.

S2K2GO!!

Wow! Any power mods, or stock?

On a freeway? How did the car feel at that speed?