transmission gearing

[tyrannix]

maybe worth a stickyi have a CA and a KA-e transmission, trying to figurre out which to put on this CA and which to work to go with the "uber-build" CA im working on next

sofar, this info

looks like every datsun transmission gearing until 1986http://www.gracieland.org/cars....html

all the JDM s13-15 gearingshttp://nissansilvia.co.nz/tech...e.htm

and then (from various sources + searching nico)

Z20s transmission 1981 ONLY1st: 3.321, 2nd: 2.077, 3rd: 1.308, 4th: 1, 5th: 0.864

Z22s transmission 1981-831st: 3.592, 2nd: 2.246, 3rd: 1.415, 4th: 1, 5th: 0.813

Nissan Pathfinder 1997-2004 Transmission number FS5R30A1st: 3.580, 2nd: 2.077, 3rd: 1.360, 4th: 1, 5th: 0.811

Nissan 240sx 1989-1998 Transmission number FS5W71C1st: 3.321, 2nd: 1.902, 3rd: 1.308, 4th: 1, 5th: 0.759

89-90 Silvia Ks/180SX 1st: 3.321 2nd:1.902 3rd:1.308 4th:1.000 5th:0.838

89-90 Silvia Q/J1st: 3.592 2nd: 2.057 3rd: 1.361 4th: 1.000 5th: 0.821

from the info i have (and searched) all of these will bolt up to a KA or CA bellhousing, so all are fair game

just want to verify info and ask for any other gearings anyone knows about

and the only difference between a KA and CA18DET transmission is 5th gear KA 5th: 0.759 (all years)CA 5th: 0.838

so the CA 5th gear will be a little more responsive VS the KA one having better mileage. and the pathfinder 5th gear being a middle line between the two and the 1981 z20 being really jumpy

of note: the CA18DE diff gear was the highest @ 4.375:1, the CA18DET is 4.363:1 anything to add?


Modified by tyrannix at 5:59 PM 12/25/2005

[sil_eightyRPS13]

the KA transmission has the wider 5th gear...the CA to me seems usless on the highway or any high top speeds....i switched and it was a mere $100...

[biosehnsucht]

a word of warning: some CA18DE's w/ 4.375 were R180 diffs so be careful if you're looking for crazy diff upgrades.

don't forget the CA revs higher than the KA, and w/ its proper diff gear its 7% "more" acceleration (4.363 vs 4.08).

[tyrannix]

exactly

so KA 5th: 0.759 (all years)CA 5th: 0.838

the total gearing with the correct CA diff will be higher, so the KA gearbox would probably be the best choice, for the highway cruising 5th to get some better mileage, but get the asphalt tearing 1-4... unless its just a drag car for some reason

a word of warning: some CA18DE's w/ 4.375 were R180 diffs so be careful if you're looking for crazy diff upgrades.

don't forget the CA revs higher than the KA, and w/ its proper diff gear its 7% "more" acceleration (4.363 vs 4.08).

[biosehnsucht]

mpg.. pssh.

it's all about the POWAH!!!

(altho I wouldn't mind a crazy custom 6 speed with close 1-5 and a tall 6 for econo cruising, but I'm just dreaming I won't have the $$$$$ for that ever probably)

[float_6969]

I've run both transmission's, though not with the new diff gears. The problem with the KA transmission and 4.083 is that it's nearly impossible to stay out of boost going up hills and such. Just being in boost kills mileage. My THEORY (I haven't tested it yet) is that the CA transmission and the 4.363 diff gears will actually yeild better mileage due to being able to utilize the higher revs to get the power you need to climb the hills and not the boost.

I could also be full of crap.

[biosehnsucht]

yeah under 4k I'm always in at least some boost, at 4k and up I can ride the pre boost power curve.. thats CA transmission + 4.08 gear

[meancasper]

I know this isn't really related but does anyone know the gearing for the Frontier that's 4X4? it has a VG33ER I think. Can't seem to find the specs.

[mbmbmb23]

all the JDM s13-15 gearingshttp://nissansilvia.co.nz/tech...e.htm

Modified by tyrannix at 5:59 PM 12/25/2005

Link doesnt work. I've seen it before tho.

-m

[capwred]

i run the ka transmission and the ca diff gears.and i like it.but i never have run anything else.as long as i dont get into boost on the hwy i get around 17-18 psi

[r34 gtr]

im always in boost going up hills. it kills me (and my gas). ive got the CA transmission and KA diff gears. i either have to speed or have it in a low gear at 4 or 5k, so when i get stuck behind the "i heart kids" mom mobile going 5 under up the mountain i have to wind it all the way up so i can match speed with it.

i was considering a custom gearset but i dont think ive got the funds right now. its so expensive got the s13. my friend got a cusco gearset for his wrx and it was somewhere around 900 bucks, but when i find them for the ca its like 2000 or so. its not fair i tells ya!

- Tim

[DjLiquid]

I wish I could figure something out with these FWD CA transmissions.. It's just killing me. @70MPH, my revs are sitting at 4000 =/. It's just nuts... My turbo finally bit the dust on the way back from my cabin cause the highway speed is 100kmh (60mph roughly) and it wouldnt take it... Ive gotta change the gearing somehow and with some other car.

Is there any math formula out there to figure out what your top speed would be if you had all the gearing info?

[kapower06]

dj liquid... your at 4k rpm at 70? thats insane, are you in 5th gear? lol..... In 4th gear im at that. also what transmission has a taller 5th gear then the ka? My 5th gear is longer/taller (higher speed at same rpm) then my old KA transmission....

[yourmomsrps13]

i just saw this...http://cgi.ebay.com/ebaymotors...wItem

[r34 gtr]

for $2300 i think i would do what swedish mike did and drop in a e46 m3 6spd. you cant argue with those zf transmissions. theyre geared much taller as well, so that 6th gear would do you proud on the interstate.

- Tim

[davidricardo86]

Seems to me like a lot of guys like having wider/longer gear ratios. Personally thats great, but i think that a short gear ratio transmission would do the smaller ca18det better. Seems like acceleration through the corners would feel more precise or responsive. Do you guys prefer "taller gearing" because you want to max out on top speed? Where would you even be able to use this gearing and even if you had the right amount of power you probably wouldnt be able to control it aswell on lets say a track... thats kinda what im thinking if i were to have this smaller engine.

[DjLiquid]

yup... 5th gear... crazy, aint it? I think I need to replace those gears ASAP

[kapower06]

davidricardo86-I like having the capability to top out around 175-180mph if i had the road and power to tackle that goal, i also like crusing at a low rpm down the highway and keeping things nice and cool .

[davidricardo86]

davidricardo86-I like having the capability to top out around 175-180mph if i had the road and power to tackle that goal, i also like crusing at a low rpm down the highway and keeping things nice and cool .

Cool. I prefer track or a road course type setup. 120mph is fast. 140mph is faster. 160mph is crazy. 180mph and so on and on... ehhh... all youre doing is going faster. True. But this wasnt the reason ive decided to purchase a ca18det. The CA was my choice because of revablilty, engine technology and controls (even for its age), lightest engine, cast iron block, aluminum head and intake manifold with "ECCS" plenum. Also this engine sits further back and further down compared to its counterparts. Closer to the center of the car better for overall balance, improved handling, etc.

[Kouks]

Does anyone know the gearing of the rb25?

[progman]

Was that a list of all the trannys that will work with the CA? do you need to swap the bell housing?

The Ka-e transmission works, does the ka24de's work as well?

[Kouks]

same transmission cept for bellhousing, if you would have read its already up there, use ca bellhousing. different 5th gear also.

[nocwage]

I've got an imported Silvia and the gearing is SHOORTT when you've got the 4.36 final drive..at 120km/h (75mph) I'm at around 3800rpm...

As for going up hills I'm still in boost as soon as there is any real load being put on the engine.. unless I'm in revs too low to make boost.