Final drive ratios????????/

[Toddnos]

Some one .........anyone?........please explain final drive ratios. Pros/cons
of changing your FD? Hybrid tranny???????Help a brutha out?

[Anonymous]

ok now lets be nice to each other on this one....let me give you 3 ratios
hf-3.2
dx-3.8
si-4.2
the si final will have the quicker acceleration of all 3. so if your looking for acceleration look towards an si final or like the srr 4.7 or 4.9. the bad part about going with a higher final drive is gas milage...goes down hill. basically smaller #=slower accel and better gas milage, and larger #=faster accel crappier milage.
now hybrid trannys. basically changine the 1-5 gear ratios to the specs your looking for...depends on what you wanna do. right now im running a zc/si hybrid consisting of the si 1-2 gears and zc 3-4 to make a close ration 2-5 gearset, along with the si final drive for better accel. so far this is the only hybrid i have tackled. in a little bit ill be trying to see what i can do with the gearset to make use of my new turbo set up. the zc/si hybrid is great for a n/a engine one that will be reving fairly high, which wont be very good for turbo since a turbo needs a wider 1-5 gear ratio set.

[Toddnos]

ok now lets be nice to each other on this one....let me give you 3 ratios
hf-3.2
dx-3.8
si-4.2
the si final will have the quicker acceleration of all 3. so if your looking for acceleration look towards an si final or like the srr 4.7 or 4.9. the bad part about going with a higher final drive is gas milage...goes down hill. basically smaller #=slower accel and better gas milage, and larger #=faster accel crappier milage.
now hybrid trannys. basically changine the 1-5 gear ratios to the specs your looking for...depends on what you wanna do. right now im running a zc/si hybrid consisting of the si 1-2 gears and zc 3-4 to make a close ration 2-5 gearset, along with the si final drive for better accel. so far this is the only hybrid i have tackled. in a little bit ill be trying to see what i can do with the gearset to make use of my new turbo set up. the zc/si hybrid is great for a n/a engine one that will be reving fairly high, which wont be very good for turbo since a turbo needs a wider 1-5 gear ratio set. Thanks man.........I appreciate it!! My civic will be undergoing a a6 block replacement, so while its out i was thinkin about cracking the tranny and doin a hybrid job on it. Did you do the work yourself? How hard was it? I am pretty competent with a wrench.............Oh yah, how much does the rpms drop between shifts with your setup?

No hard feelings man........sorry for being a dick. :oops:

[Anonymous]

So..if I'm doing a Y7 w/Y8 head and plan on a turbo after that,I should just stick with the stock DX gears?

[Toddnos]

So..if I'm doing a Y7 w/Y8 head and plan on a turbo after that,I should just stick with the stock DX gears?
I would..........otherwise you will be shifting too much. When i squeeze,
i go thru the gears like a motorcycle. It would be the same with boost.

[Jay eS Iye]

i've been wondering thsi same question for some time now, i'm glad i found out.

so are you saying with a turbo or blown motor you want a lower final drive?

also, where can i find info about hybriding a transmission? and you said Si 1-2, ZC 3-4 and Si final drive, does that means the Si 5th gear?

i'm gonna be stuck witha DX tranny for right now b/c my Si one bit the dust and I couldn't find a cheap Si transmission. But if I can start building up a hybrid transmission to drop in once i get some mroe money to build up the motor thigns will be gravy.

[Toddnos]

i've been wondering thsi same question for some time now, i'm glad i found out.

so are you saying with a turbo or blown motor you want a lower final drive?


. With turbo you want long gears, thats not really anything to do with the final drive. Picture a ten speed bike.........the final drive is the gears on the crank........the tranny is the gears on the wheel. A higher final drive is going to lower your top speed, and increase your low to mid capabilities. Final drive changes are really for track condition changes, or what your gonna use the car for. If its top speed and freeway driving you crave, then a lower final drive is the ticket. If its quarter mile, or light to light action you like, then a higher final drive suites your purposes..........The hybrid D tranny info is located
on Mista Bones tranny page.........use a google search. Hope this helps!
Hey kommon.......i pulled this one out of my butt. whatdayathink?

[Jay eS Iye]

ok i'm kinda getting it then, how do you tell how long the gears are?

and kinda off topic, with domestics, you have like 4:10 and 3:93 gears, explain that

[Toddnos]

ok i'm kinda getting it then, how do you tell how long the gears are?

and kinda off topic, with domestics, you have like 4:10 and 3:93 gears, explain thatDid you look at mista's tranny page? I think gears are
classified by how many teeth are on it, and circumference(sp) of the gear..........

[klungemonger]

ok i'm kinda getting it then, how do you tell how long the gears are?

and kinda off topic, with domestics, you have like 4:10 and 3:93 gears, explain that

Those gear numbers are the final drive gear ratios. It's the number of teeth on the large final drive ring gear divided by the number on the small input shaft gear.

So think of gear reduction like this: 1st-5th gear ratios are how many turns of the motor it takes to spin the gearshaft once. The final drive ratio is how many turns of the gearshaft it takes to rotate the wheels once. So if your first gear is 3:1 & final gear is 4:1 you multiply them and that tells you it will take 12 turns of the crankshaft to rotate the tires once.

[Toddnos]

Klunge is dah man!!!

[-TJ]

There are 2 more FD ratios not mentioned up top:

4.058 = 88-91 sedan
4.437 = JDM Integra ZXi/RXi/TXi (the 90-93 JDM Integra's with SOHC ZC's had this FD ratio. The 1-5 ratio's in these trannies are the same as the US Civic/CRX Si.

[Calesta]

Oh really? I knew about the 4.058 because that's listed in my 88 LX's manual... but I had no idea about the 4.437 FD. I've never heard of that one- where can I pick one up?

[-TJ]

Heh, you can get one in Japan, unless one of the importers is getting SOHC ZC's with transmissions on them.
Check out the 90-93 SOHC Integra specs here:
http://www.honda.co.jp/HOT/ModelData/integra/9it-ka-904a/3dzxi_sy.html

You don't have to be able to read Japanese to understand what all the figures mean...

[Calesta]

Nice. I need to find me one of those final drives. :)

So what's the XSi on the right side column?

My SOHC ZC was already in the car with a ZC transmission... I guess I need to find out if it's the 3.888 FD or the 4.4... pretty sure it's the 3.888 though.

[Kwicko]

I'm having good results with my '91 CRX DX using a hybrid transmission. I'm using ZC first through fourth (first gear isn't a necessary swap, since they're the same as the Si, but we were in there anyway...), HF fifth, and Si final drive/differential. The mileage is down a bit in the city (usually about 25-32mpg, but I'm in the gas a lot, just assing around), but up on the highway. :)

At redline, the 2-3 and 3-4 upshifts drop the revs about 1500rpm (from 6500 down 5000) which keeps the motor right in the meat of its powerband (stock Si motor). The 4-5 upshift is a bit on the long side, as it drops the revs about 2000 at or near redline (6000 down to 4000). For what I was aiming at, though - quick acceleration AND a nice relaxed highway cruise - it's perfect. At 4000rpm in fifth, the car's doing around 88mph. 80mph gives a nice 3600rpm cruise.

On a recent 3000+-mile trip to Orlando, the car returned between 36mpg and 42mpg on every tank. Not bad at all, considering it was carrying two 250+ pound guys, a couple hundred pounds of tools, spares, and luggage, and we were running between 80 and 90mph most of the way, with the A/C on! I'm lovin' that transmission. With just me and a soft suitcase on the road, I'm betting it would return closer to 45mpg. The only new Civic that can beat that is the Hybrid Civic. But it's nowhere near as quick, nor as fun to drive. :)

Mike

[green_hornet_96]

My ex does 3600rpm @ 80...yet i can't get that mileage (i get 34 hwy), best i'd ever heard of was my friend's ex getting 39 hwy. That CRX mileage is amazing.

I need to do a hybrid tranny, right now the thing drops off from redline (7000ish) down to 4500, right out of the powerband. It's not even in VTEC anymore! What a pain.