WOW!

 

Ive got an AP2 trans as well. Car pulls MUCH harder than my friends stock AP1.

 

With no other changes, your car only pulls 4% harder in gears 1-4 than it did with the AP1 trans. Also worth noting that your car now doesn't pull anything like as hard from 64mph in 3rd as it did in 2nd with the AP1 trans!

The AP2 ratios are a better real-world compromise, with slightly lower 1-4 gearing and very slightly taller 6th gear. But IMO this mod is hardly worth it unless there are problems with the AP1 trans and it has to come out anyway.

My *personal* preference would still be to stick with the AP1 transmissions closer 4-6 gearing. If I wanted "better" gearing, I'd do it with diff gears and live with higher-rpm at cruise.

 

We all have our opinions

 

Explain this one please

 

It means that you have to upshift sooner (at lower speed) with lower gears. With the AP1 trans, you'll be at 8700rpm in 2nd gear at 64mph, with the AP2 trans you'll have to be in 3rd, at 6560rpm, much taller-geared, not putting as much power to the wheels, and you will accelerate more slowly. "Improved" 1-4 gearing will improve zero-to-xx mph acceleration, but from a roll (xx mph to yy mph) you're just as likely to be slower due to having to upshift sooner.

"Better" gearing doesn't give you more acceleration at all speeds, at some speed ranges acceleration will suffer.

 

So are you saying at a 64mph roll with two ap1s, one with stock tranny and one with ap2. The ap1 would win? I am trying to see where you are coming from with this. Closer gearing allows for more acceleration because you are climbing through the power band quicker. Thats why I love this transmission over the ap1s, when at the track exiting a corner I would climb the power band quicker and end up passing the opposing ap1. Even with the AP2 tranny fourth gear will hit 115...Whenever I race someone I never float over that mark anyways, once you get to that speed aerodynamics start taking there toll.

Either way I agree with you. Unless you are out a transmission this is not something I would jump on today.

And to the OP the 4.44 are actually the most loved gears on the track.

 

^^^ I agree

 

Overall your off in your assessment of effectiveness a bit, your off in your actual mph vs rpm as well sorry.

I do agree with your last statement however.

 

The point is, if you are lower-geared you have to upshift sooner. I.e., there is some speed from which you will be significantly slower due to having to be in the next higher transmission gear. I.e., a stock AP1 acclerating from ~64mph in 2nd gear will be quicker than an AP1 with an AP2 transmission accelerating from the same speed in 3rd gear.

The AP2 doesn't have *closer* gearing, it has lower 1-4 gearing with the same rpm drop between ratios. And the AP2 trans in fact has wider gearing between 4-6.

It all depends on the track. There are some corners where you will suffer with the AP2 trans due to having to be a gear higher than a stock-transmission AP1. My impression from the tracks I've been to with my stock AP1 is that AP1 ratios seem to be remarkably well suited to a number of different courses.
Realistically speaking, the small difference isn't likely to make that much difference at most tracks.

With the the AP1 trans, you hit 116mph at 9000rpm in 4th. With an AP2 trans, it'll be 112mph at 9000rpm (depending of course on tire size).
At faster tracks like Watkins Glen, a stock AP1 can hit an indicated 129mph (maybe 125 actual?) along the back straight after the uphill esses. There, and at other faster tracks, the AP1's closer 4-5 ratios will be a slight advantage.

The differences between the AP1 and AP2 transmissions are pretty minor. Mainly I just want to point out that any changes in gearing will result in improved acceleration at some speeds and REDUCED acceleration at other speeds due to having to upshift sooner.

There will be tracks where stock 4.10 gearing will be preferable. It all depends on the corner exit speeds.