Final gear Ratio. - Honda Prelude Forum

[SUB[EX] · 02-13-2003, 12:43 AM

Is there anyway to get a better gear ratio on the SI tranny or F22 tranny? IS there a kit like the one they have for the b series trannys? Im planning on tearing down my old F22 tranny soon and i was just wondering what i would need to do to convert it to a better final drive. I have a SI tranny currently in. I know i can just go find a vtec tranny but i was just wondering if there were other options.

kennethmina · 02-13-2003, 02:13 AM

I would suggest you keep the 5th F22A gear and use Vtec 1st to 4th.. that case you have the combination of both advantages... cruise at high speed with good gas mileage and agressive acceleration from 1st thru 4th..

[SUB[EX] · 02-20-2003, 08:51 AM

I thought there is a final gear set that will lower all of your gears. Kinda like a rear end in a RWD car.

Forbidden · 02-20-2003, 09:29 AM

Custom Final Drive Review

Ritteri · 02-20-2003, 10:42 AM

Prodrive makes a FD gear set for $1250. I just ordered one myself. They also make the well known oil pump gear set too which is a serious weakpoint on the H22. Their quality cant be beat. Pricey, but worth it.

[SUB[EX] · 02-20-2003, 10:17 PM

ouch! 1250$? I could just grab a JDM LSD tranny for 800$

[SUB[EX] · 02-20-2003, 10:31 PM

Ok whats the difference between the H Series and F series trannys? Is it JUST the Final drive gearing or is all the gears??

So if got a custom drive set 4.714:1 and put it in a Vtec tranny will it end up the same 4.714:1 in a SOHC S tranny?

Ritteri · 02-20-2003, 10:55 PM

Honestly I cant answer that. I know a 4.7143 FD gear set on a 5th gen. will dramatically increase launching ability and improve the engines useable torque range. And if the car's valvetrain is upgraded to rev to 8000rpm it will still do 150mph for a top speed, which is VERY FAST. And it will get there alot quicker in the process. Expect to lower gas miliage though too by about 15%.

[SUB[EX] · 02-20-2003, 11:50 PM

someone has gota know. who knows?
If this is true. All i need is the final drive gearing from a vtec tranny and my spair S tranny becomes usefull again.

Forbidden · 02-22-2003, 09:31 AM

All the gears are different. So changing the FD won't be the same on the S tranny or the VTEC. Here's the gear ratios for the 4th gens trannys as well as the 5th gen one.

4th Gen
S
1 3.307
2 1.809
3 1.230
4 0.903
5 0.705
FD 4.062

Si
1 3.307
2 1.857
3 1.320
4 1.034
5 0.812
FD 4.266

VTEC
1 3.307
2 1.950
3 1.360
4 1.071
5 0.870
FD 4.266

5th Gen
1 3.285
2 1.956
3 1.344
4 1.034
5 0.812
FD 4.266

Satan_SRV · 02-22-2003, 09:41 AM

Quote:

Originally posted by Ritteri
Honestly I cant answer that. I know a 4.7143 FD gear set on a 5th gen. will dramatically increase launching ability and improve the engines useable torque range. And if the car's valvetrain is upgraded to rev to 8000rpm it will still do 150mph for a top speed, which is VERY FAST. And it will get there alot quicker in the process. Expect to lower gas miliage though too by about 15%.

How does a final drive increase launching ability?????

Satan_SRV · 02-22-2003, 09:41 AM

If you put an H23 or H22a final drive on the tranny, yes it will be better, but still not as good as an H23 tranny..

nuro · 02-22-2003, 10:04 AM

can the h23 bolt up to the h22 block?

Satan_SRV · 02-22-2003, 11:08 AM

yes

nuro · 02-22-2003, 12:02 PM

Quote:

Originally posted by Satan_SRV
yes

hmmm maybe i should look into getting one then

Ritteri · 02-22-2003, 12:25 PM

I think doing any kind of a swap in the trannies is a complete waste of time,and money as the gearing change isnt that great at all. keep your tranny, and change out the FD gear set to something steeper. Thats the only thing really worth doing.

[SUB[EX] · 02-22-2003, 05:26 PM

Ok, say i get a destroyed SI tranny or vtec tranny. I take the final drive out and put it in my S tranny. What kind of improvment will this be?

Ok heres a better question. How are the gears measured? Is it the size of the gear, is it how many teeth it has, or is it more likely that they are measured by how many times the tires spin per rotation of the engine? If this is the case, the current #'s for each gear would be different with a different final drive. So its possible that if you put a final gear that lowers the vtec tranny, it may lower the S tranny more. Or it could be less, or possibly the same. I dont know. Is someone here a tranny expert. I was gona rip my S tranny apart but since all my tools got stolen with my car i cannot do it.

nuro · 02-22-2003, 10:47 PM

Quote:

Originally posted by Ritteri
I think doing any kind of a swap in the trannies is a complete waste of time,and money as the gearing change isnt that great at all. keep your tranny, and change out the FD gear set to something steeper. Thats the only thing really worth doing.

if you're referring to me changing my tranny there's a good chance its already royally screwed. so i might as well replace the whole thing if the price is right.

Ritteri · 02-23-2003, 12:46 PM

Royally screwed? Care to go into detail?

[SUB[EX] · 02-23-2003, 01:44 PM

cmon, someone has gota know this stuff.