AP1 vs. AP2 Gear ratio

Old 05-31-2007, 10:04 PM
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Exclamation AP1 vs. AP2 Gear ratio

They say that AP2's first four gear is closer than AP1...but when I tested it on a gear calculator...the AP2 is slightly longer... try at John Maher Racing: Gear Ratio Calculator or at http://www.f-body.org/gears/... Im sure of the tire size that I've input for AP2 but is AP1 really got 225/50 R16 rear tires when I input it in the gear calc the results are insane...I mean the results were LONG gears...I just based the AP1 in Gran Turismo 4...I'm pretty sure that the gear ratio in their is accurate at real life...right?...but also when I watched a video at youtube.com named "F20c vs. F22c"...I saw Keichi Tsuchiya and another pro racer testing both...I really saw that the gears of the AP2 is shorter! but at the gear calc I saw that AP2 is slightly longer!
(speed in redline)
Gears-------- AP1(GT4)-------AP2(gear calc)--------- AP2 (based on the video)
1st-------- --71 kmh--------- 72 kmh----------------- about 60 kmh
2nd ----------110 kmh--------112 kmh-----------------about 94 kmh
3rd-----------151 kmh-------- 155 kmh---------------- about 123 kmh
4th---------- 191 kmh --------195 kmh---------------- about 160 kmh

If somebody really knows the truth please tell me...tnx...
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Old 05-31-2007, 11:52 PM
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Originally Posted by DMC_S2000 View Post
They say that AP2's first four gear is closer than AP1...but when I tested it on a gear calculator...the AP2 is slightly longer... try at John Maher Racing: Gear Ratio Calculator or at http://www.f-body.org/gears/... Im sure of the tire size that I've input for AP2 but is AP1 really got 225/50 R16 rear tires when I input it in the gear calc the results are insane...I mean the results were LONG gears...I just based the AP1 in Gran Turismo 4...I'm pretty sure that the gear ratio in their is accurate at real life...right?...but also when I watched a video at youtube.com named "F20c vs. F22c"...I saw Keichi Tsuchiya and another pro racer testing both...I really saw that the gears of the AP2 is shorter! but at the gear calc I saw that AP2 is slightly longer!
(speed in redline)
Gears-------- AP1(GT4)-------AP2(gear calc)--------- AP2 (based on the video)
1st-------- --71 kmh--------- 72 kmh----------------- about 60 kmh
2nd ----------110 kmh--------112 kmh-----------------about 94 kmh
3rd-----------151 kmh-------- 155 kmh---------------- about 123 kmh
4th---------- 191 kmh --------195 kmh---------------- about 160 kmh

If somebody really knows the truth please tell me...tnx...
I instructed a guy in an AP2 at at Laguna Seca a few months ago and he was redlining 3rd gear at about 75 mph. My AP1 redlines 3rd gear at about 92 mph. I've hit 120 mph in 4th gear when it touched the rev limiter. I'm not sure about the other gears.
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Old 06-03-2007, 09:16 PM
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Hello all, first time on this site.

Anywho

I have a AP1
1st 40mph
2nd 60mph
3rd 90mph
4th 115mph
5th 135mph have redlined this gear.
6th 165ish, only base on math never relined this gear.
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Old 06-03-2007, 09:19 PM
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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
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Old 04-20-2009, 07:12 PM
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I'm guessin this answer the reverse question asked no way in hell anyone needs to hit vtech in reverse
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Old 04-20-2009, 08:32 PM
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ya know ive often wondered what vtec would feel like in reverse. id prolly need to bring a second pair of pants with me the day i find out
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Old 04-21-2009, 07:28 AM
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This is a sticky at the top of this section. It is accurate.

http://www.turnzero.com/technical_re...ear_calculator
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Old 04-21-2009, 10:05 AM
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Originally Posted by Dmaye View Post
vtech
fail
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Old 04-21-2009, 10:35 AM
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I have an AP2. I max out in 1st at 37mph, 59mph in 2nd, 77mph in 3rd, 98mph in 4th...I stop looking at the speedometer after this point. I could be off by 1 or 2 miles because there's a delay in when I look at the speedometer and shifting to the next gear.

Last edited by J'sS2K; 04-21-2009 at 10:37 AM.
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Old 05-02-2009, 10:22 AM
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Now the question I have is - couldn't one swap out the 6th gear cogs from an AP2 trans into an AP1 to have semi-decent freeway rpms?

All I got when asking about this on HT forums were people saying that there's not enough torque to lower the rpms at all but that's definitely not true.

On the freeway in 6th gear I'm usually 4500-5000rpm due to traffic speed, and at such a high rpm the engine is making more than enough power to accelerate quickly without shifting.

That being said, we've all driven old slow cars that you HAD to downshift to accelerate on a freeway... I'd be plenty happy to lose a little 'power' in 6th in exchange for lower RPM's and better mileage.
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Old 05-02-2009, 03:38 PM
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Originally Posted by Kalm_Traveler View Post
Now the question I have is - couldn't one swap out the 6th gear cogs from an AP2 trans into an AP1 to have semi-decent freeway rpms?

All I got when asking about this on HT forums were people saying that there's not enough torque to lower the rpms at all but that's definitely not true.

On the freeway in 6th gear I'm usually 4500-5000rpm due to traffic speed, and at such a high rpm the engine is making more than enough power to accelerate quickly without shifting.

That being said, we've all driven old slow cars that you HAD to downshift to accelerate on a freeway... I'd be plenty happy to lose a little 'power' in 6th in exchange for lower RPM's and better mileage.

? just get an ap2 tranny lots ez'er
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Old 05-02-2009, 03:59 PM
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I don't like the rest of the gears, wouldn't be optimal for the F20C (at least didn't feel that way when I test drove an AP2).

I've done transmission work before so it's not a huge deal replacing parts; just not sure if the cogs are physically interchangeable like they often are with other Honda transmissions.

Honda doesn't even make the S2000 trans do they?
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Old 10-26-2010, 01:26 PM
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I know this is off the subject a little, but if anyone can help? I have a 2000 s2k. In 4th gear at 40 mph I'm pulling 3100-3200 rpm's. This seems a little, and the car is asking to be put into 5th gear. Is there a fix or is this normal.

Thanks
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Old 10-26-2010, 02:23 PM
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Originally Posted by tcowan View Post
I know this is off the subject a little, but if anyone can help? I have a 2000 s2k. In 4th gear at 40 miles per hour I'm pulling 3100-3200 rpm's. This seems a little, and the car is asking to be put into 5th gear. Is there a fix or is this normal.

Thanks
Something's definitely wrong if it's asking to be put into 5th gear at 3200rpm.

A healthy AP1 shouldn't be asking you to shift up until at LEAST 8800rpm
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Old 10-26-2010, 02:27 PM
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Not in a neighborhood. I shift at about 4000 and drive around 3500 around town.

Jonathan
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Old 12-04-2013, 08:27 PM
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I have a simple question. Does the AP1 get better gas mileage than the AP2 going say 70mph in 6th gear on the highway due to the different gear ratios? Please advise.
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Old 12-05-2013, 12:46 PM
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I don't think so, because both cars(AP1 and AP2) are turning around 3750 at 70 mph.

ROD
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Old 12-05-2013, 04:14 PM
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Originally Posted by rrounds View Post
I don't think so, because both cars(AP1 and AP2) are turning around 3750 at 70 mph.

ROD
AP2 has a slightly longer gear ratio for 6th but it also has 10% higher displacement. Ap1 probably does get better fuel economy on the highway for that reason.
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Old 12-05-2013, 05:07 PM
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I was amazed at how high the RPMs were for my normal 75-80 mph on the highway...my TL is sitting at like 2800 rpms.
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Old 12-06-2013, 10:00 AM
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Originally Posted by rockstar143 View Post
I was amazed at how high the RPMs were for my normal 75-80 mph on the highway...my TL is sitting at like 2800 rpms.
You get used to it

It helps to think of it as a percentage of the available revs. 4000/9000 isn't so bad.
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Old 12-06-2013, 12:46 PM
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No doubt...plus, she didn't get any worse MPG than my fata$$ TL anyway.
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