Anyone wanna guess what transmission I have?

[kapower06]

Ok, well the other day I was thinking that some people complain about the stock gearing being too short. But my transmission is geared wayyyy tooo long... Im talking about cruising at 75 in 5th is right at 2.8k rpm. No my speed-o isn't wrong, No my tach is not wrong. I have a stock differential stock wheels and tires. At the track I cross the 1/4 mile in third gear at about 6500-6800 rpm, my trap speed is right at 95mph. If I hold out third until 7500 rpm the needle is right at 112-115mph, grab 4th gear and as soon as it starts accelerating bam! speed-cut. 5th gear Is usless unless im cruising. With this kind of gearing 170-180mph would be attainable with enough power, the right aero, and suspension mods...

Well I guess my main thing is trying to figure out what transmission I have... could it be possible it has a long ratio set? it does grind pretty bad slamming 2nd and a little going into 4th, yet 2-3 and 4-5 shifts are smooth.

Or option B = Me quit bitching about getin great highway MPG and go for 400+whp to make use of my freakishly long gearing.

Any thoughts are appriciated.

[WESIDE]

More info is required bout ur make and model... But damn that transmission must be nice

[kapower06]

its a s13 with a ca swap. ca transmission. stock driveshaft and rear-end

[knightrider]

what was it like before the swap, what rpm were you at with the KA doin 65mph?also, iirc all CA18 in japan had a 4.3 rear end, diferent from our 3.9 that we have stock so that will make all the gears a little longer.

edit- well i found the stock gear ratios for the caGear Ratios 1st 3.321/3.027 2nd 1.902/2.057 3rd 1.308/1.000 4th 1.000/0.694 5th 0.838/- Reverse 3.382/2.272 Final Drive 4.363/4.363

using this calculator you can see what your supposed to be at. stock tire is 24 inches diameter, http://www.et-studios.com/moto....htmldid your CA come modified or stock? was it a set or a clip? maybe you got a modded transmission if you got a set, but i dont see a modded transmission coming on a stock clip, gear sets dont come cheap for trannies.if you change the dif to a 3.7 instead of 3.9 you get what comes out to be what your saying. speedcut at the top of 3rd. never heard of a 3.7 diff though. in my single cam KA, i used to be right at 3000 @ 65mph with a 3.9. my ca is around 3500 iirc.

Modified by knightrider at 1:32 AM 4/19/2006
Modified by knightrider at 1:37 AM 4/19/2006

[boost_boy]

Ok, well the other day I was thinking that some people complain about the stock gearing being too short. But my transmission is geared wayyyy tooo long... Im talking about cruising at 75 in 5th is right at 2.8k rpm. No my speed-o isn't wrong, No my tach is not wrong. I have a stock differential stock wheels and tires. At the track I cross the 1/4 mile in third gear at about 6500-6800 rpm, my trap speed is right at 95mph. If I hold out third until 7500 rpm the needle is right at 112-115mph, grab 4th gear and as soon as it starts accelerating bam! speed-cut. 5th gear Is usless unless im cruising. With this kind of gearing 170-180mph would be attainable with enough power, the right aero, and suspension mods...

Well I guess my main thing is trying to figure out what transmission I have... could it be possible it has a long ratio set? it does grind pretty bad slamming 2nd and a little going into 4th, yet 2-3 and 4-5 shifts are smooth.

Or option B = Me quit bitching about getin great highway MPG and go for 400+whp to make use of my freakishly long gearing.

Any thoughts are appriciated.

I personally like option B. My transmission too is lazy like that, but since I have the power to row through the longer gears with 4th gear @ 7375rpm producing 140mph and this was with an internally stock CA, I'm not complaining. The gearbox is the key and of course some power does help, too .

Dee

[Kouks]

that sounds awesome if you can really go that fast. I figured with the ka 4.083 rear end and ca spinning at 7500 you can go 157 in 5th. I dont know how youre able to go that fast, but third gear must take forever to go through.....

[nissanic89]

did i remeber reading some where that auto 240sxs had different gears in the diff or am i just confused ?-chris

[boost_boy]

that sounds awesome if you can really go that fast. I figured with the ka 4.083 rear end and ca spinning at 7500 you can go 157 in 5th. I dont know how youre able to go that fast, but third gear must take forever to go through.....

I rip through 3rd gear with ease and easily go 115mph in 3rd before redline.

Dee

[float_6969]

IDK, I think that all of this actually sounds about right. IIRC (and it's been a while) I'd hit the governer pretty early in 4th, but I'm pretty sure that I was over 3K in 5th @ 75. You don't have a TT Z32 VLSD in there do you? If so, you'd have a 3.9:1 diff in there and that would make everything sound about right,except if that was done, someone would have had to have gone to the trouble to get the correct gear for the speed sensor to correct for the diff.

Regardless, something sounds odd/not stock...

[kapower06]

stock open rear end, car has always been a manual. Soo Im not sure maybe its just some ca trannys have longer gearing then others... I think Im just gunna go with more power to pull through the gears. But that wont be until I get back from school. Earlier I was driving around and decided to see how far second would take me, well at 7500-7700 Im at 77-80mph. Does this sound about right? I dont think so. And yes cruising at 75mph is right at 2900-3000rpm, half of the needle is on the mark for 3k the other half is below, so maybe 2900 rpm. when i had the ka the gearing was just like everyone else's.

[boost_boy]

stock open rear end, car has always been a manual. Soo Im not sure maybe its just some ca trannys have longer gearing then others... I think Im just gunna go with more power to pull through the gears. But that wont be until I get back from school. Earlier I was driving around and decided to see how far second would take me, well at 7500-7700 Im at 77-80mph. Does this sound about right? I dont think so. And yes cruising at 75mph is right at 2900-3000rpm, half of the needle is on the mark for 3k the other half is below, so maybe 2900 rpm. when i had the ka the gearing was just like everyone else's.

Some CAs just seem to have longer gearing than others. An ex-friend of mine who has a 530+whp KA-T powered S13, drove a customer's car of mine after I installed an SDS EM-3F system a couple of years ago and he says he loves the long gearing of the CA compared to that of his KA. He was laughing like a little school girl at the was the CA revs.

Dee