Which gear ratios???

[torq455]

I'm a little confusied on what 5 speed gear ratios/FDRs are in a couple of different cars. A 91 Sunbird 2.0 and a 94 Cavalier RS 3.1. I thought they were all the same. Help! Thanks.

[sharkey]

RE: Which gear ratios???

well, the 3.1l is as follows

V6 Getrag All years J and L body 1st 3.50 2nd 2.05 3rd 1.38 4th 0.94 5th 0.72 Axle 3.61

the sunbird 2.0l im not sure of. they use an isuzu 5 speed.

[torq455]

RE: Which gear ratios???

Ok, great. Got that one down. Now I just wonder what my lil bird had. They both had the same top gear cruise RPM. I know with different ratios that can be achieved w/o having the same tranny. I just figured GM would use the same tranny. HA! Silly me!

[sharkey]

RE: Which gear ratios???

na the isuzu is cheaper to build because it doesnt need to be as strong as the v6 tranny.

[torq455]

RE: Which gear ratios???

ahhhh I see.... it's starting to make sence. i'll be sure not to use that one should i 5 spd swap. now i just need those ratios--out of curiousity.

[SHOoff]

Your bird probably had the 3.58 FDR. As far as I've found I've only ever turned up with 3 different FDR's for the Isuzu MK7/MR3 tranny.

3.58 seem used mostly by J-body cars
3.83 i've found in the Isuzu Stylus
4.10 you'd find in a Geo Storm GSi... not sure what the lower models had.

It's also said that the MJ1 (96-99 2.4L Cav 5spd) used a 3.91, but i'm not real sure about that.

[torq455]

What about the other 5 gears?

[SHOoff]

What about the other 5 gears?

From V6z24.com
Isuzu 5 Speed Manual (RPO: MK7)
1st - 3.91
2nd - 2.18
3rd - 1.45
4th - 1.03
5th - 0.74

[spacecadetz26]

turbo 2.0 sunbirds use a getrag also.

[sharkey]

the 2.0l turbo does use a getrag. im not sure of the ratios in it though, i cant get an answer out of anyone on that. i guess when i put the lsd into my buddies 90 turbo bird, ill have to figure them out.

[torq455]

i figure the turbo's use the same at the V6's. it's close enough to the torque of the older 3.1.

[sharkey]

yea but the torque curve on those motors is way different. at low rpm, you have a serious lack of torque, and when the boost hits, the torque curve basicly goes straight up. the v6 has a way flatter torque curve.

[torq455]

dosen't matter what the torque curve is. it the peak that the tranny will see. it's only about 15 ft.lbs.

[sharkey]

i was reffering to the gear ratios. if the turbo 4 cyl had the same gearing that the v6 did, it would be an absolute dog till about 3k rpm when the turbo spooled, then would take off like a rocket. it deffinitly doesnt do that, it goes not to bad before it hits boost. and i know his sits about 2800rpm at 100km/h, my v6 sits around 2200.

[torq455]

that's what I don't get. the 94 cav V6 and my 91 2.0 bird cruised at the same RPM. that's why i thought they all had the same thing. -shrug- oh well. it's not that important. like i said, just curiousity. thanks for all your help guys!