s2kride

I can't wait for the weekend. I was looking to see if anyone had 4.44 gear for sale so I could do that all at once.

ZDan

My understanding was that the lower AP1 gear ratios are taller and closer, right?
Closer ratios = easier to stay in VTEC.

fltsfshr

Actually 1 through 4 ratios are exactly the same ratios. 5 and 6 are a little longer ratio in an ap2. The difference is the reduction gear which influences all of them is a little lower in the ap2. That's what gives you the change. So 5th and 6th remain the same as an ap1 as they are higher in ratio and 1 thru 4 are a little shorter as their ratios didn't change.

fltsfshr

civicej8

i'd rather buy some gears instead.

qbmurderer13

AP2 vtec kicks in at about 5800ish, so try this. Shift at 8000rpm in your AP1, youll notice that youll fall out of vtec, thats what will happen with the an ap1 tranny in an ap2.

And fltsfshr is right contrary to what I said earlier, turns out the first 4 gear ratios are the same but since the last 2 are longer it makes the first 4 a bit shorter.

Its not going to be a huge improvement, but it will definately be noticeable, pair the ap2 tranny with some 4.44's in an AP1 and youll have a really nice setup.

s2ka

AP2 Tranny compared to AP1:
Gears 1-4 = 4% shorter
Gear 5 = 1% shorter
Gear 6 = 2% taller

qbmurderer13

Seems like theres different stats all over the place...

AP1
6-speed, close-ratio
Primary Gear Reduction - 1.160
1st gear - 3.133 --- Est speed @ 9000rpm ~ 45mph
2nd gear - 2.045 --- Est speed @ 9000rpm ~ 60mph
3rd gear - 1.481 --- Est speed @ 9000rpm ~ 90mph
4th gear - 1.161 --- Est speed @ 9000rpm ~ 115mph
5th gear - 0.970 --- Est speed @ 9000rpm ~ 135mph
6th gear - 0.810 --- Est speed @ 9000rpm ~ 160mph
Reverse - 2.800
Final Drive - 4.10 with Torque-Sensing Limited-Slip

AP2
6-Speed Transmissions Gear Ratios:
Primary Gear Reduction - 1.208
1st gear - 3.133
2nd gear - 2.045 --- Est speed @ 8000rpm ~ 52mph
3rd gear - 1.481
4th gear - 1.161
5th gear - 0.942
6th gear - 0.763
Reverse - 2.800
Final Drive Ratio - 4.100

reedkr2

Are you upgrading the differential?

fltsfshr

What his percentage is saying is that the additional length of the 5th gear is not enough to overcome the reduction gear change in comparison to an ap1

Gears 1-4 = 4% shorter
Gear 5 = 1% shorter
Gear 6 = 2% taller

I haven't done the math comparing it to thisAP1
6-speed, close-ratio
Primary Gear Reduction - 1.160
1st gear - 3.133 --- Est speed @ 9000rpm ~ 45mph
2nd gear - 2.045 --- Est speed @ 9000rpm ~ 60mph
3rd gear - 1.481 --- Est speed @ 9000rpm ~ 90mph
4th gear - 1.161 --- Est speed @ 9000rpm ~ 115mph
5th gear - 0.970 --- Est speed @ 9000rpm ~ 135mph
6th gear - 0.810 --- Est speed @ 9000rpm ~ 160mph
Reverse - 2.800
Final Drive - 4.10 with Torque-Sensing Limited-Slip

AP2
6-Speed Transmissions Gear Ratios:
Primary Gear Reduction - 1.208
1st gear - 3.133
2nd gear - 2.045 --- Est speed @ 8000rpm ~ 52mph
3rd gear - 1.481
4th gear - 1.161
5th gear - 0.942
6th gear - 0.763
Reverse - 2.800
Final Drive Ratio - 4.100

but it looks right.

fltsfshr

ZDan

It doesn't matter which tranny you have, the rpm drop between 1-2, 2-3, and 3-4 will be precisely the same because the ratio jump in both transmissions is the same. Only difference is that 1-4 are slightly taller in the AP1 due to taller primary ratio.

Shifting out of 1st at 8000rpm will put you at 5221rpm in 2nd with either transmission.
Shifting out of 2nd at 8000rpm will put you at 5794rpm in 3rd with either transmission.
Shifting out of 3rd at 8000 rpm will put you at 6271rpm in 4th with either transmission.

Assuming no clutch slip, etc...

Personally, I don't mind having taller 1-4 gearing and slightly closer 4-6 gearing. I'm never seriously launching the car from a dead stop, and at the tracks I've been to the gearing seems pretty well-suited.