ae92 20v gearbox options

[finney]

some interesting stuff on that page... wheres my damn bonus already!!!

[Vios-GT_07]

just out of curiosity..

does the C52 box cruise at 100 km/h in 5th, at around 3500 rpms??

took the AE93SX out to the freeway and it was roaring pretty loud at cruise speeds..

[Dale]

iirc 3500 rpm = 110km/h.... does traffic seem to be going slower than you?

[Lachie]

Don't use the GZE box, as many people have said, you won't break a c52/6 with a standard 20v. Chances are your gearbox is rooted from it having high k's and your mate being hamfisted with it.

As people have said, the e series boxes are heavy, thus affecting handling and the ratios will make your car slow.

Those prices your quoting for boxes don't seem too bad considering I got quoted 800 for a c56 that was from City Dismantlers that are known for being overpriced.

I got an extra c52 to rebuild from u-pull-it for 180 bucks, only needed to undo three bolts too

There are always people selling c52's on the forums, just keep your eyes out

[finney]

just out of curiosity..

does the C52 box cruise at 100 km/h in 5th, at around 3500 rpms??

took the AE93SX out to the freeway and it was roaring pretty loud at cruise speeds..

that sounds about right... from memory mine sits around 4000 at 120...

[-GT-]

Yep, i concur, my c52 does 4k rpm at 120km/h

[Hiro]

The C52 in my 102 will do about 3200-3500 on the freeway at 110

[Vios-GT_07]

thanks for that guys...

yea sounds about right.. 3000 to 3500 rpms (i dun stare at gauges when cruising).. 100 km/h and i keep getting passed.. even on 17s.. strange perth traffic.. if they dun all go at 80, they go beyond 100 on the freeway.. yet i got flashed by a camera when i went 74 km/h on a 70 zone trying to pass a huge truck doing 60.. really frustrating traffic..

C52s have very good ratios.. close.. and quite high, but imo does okay for drag applications.. as for strength, well at this age everyone's had a thrash (coz of the 4A-GE) so the synchros are pretty weak and on the way out.. i suggest C52 but get it rebuilt with stronger 2nd and 3rd..

[-GT-]

thanks for that guys...

yea sounds about right.. 3000 to 3500 rpms (i dun stare at gauges when cruising).. 100 km/h and i keep getting passed.. even on 17s.. strange perth traffic.. if they dun all go at 80, they go beyond 100 on the freeway.. yet i got flashed by a camera when i went 74 km/h on a 70 zone trying to pass a huge truck doing 60.. really frustrating traffic..

C52s have very good ratios.. close.. and quite high, but imo does okay for drag applications.. as for strength, well at this age everyone's had a thrash (coz of the 4A-GE) so the synchros are pretty weak and on the way out.. i suggest C52 but get it rebuilt with stronger 2nd and 3rd..

No. C52s ratios aren’t bad, but relative to the other recommendations they are. They are not close, and they are not high, as evidenced by the discussion of 3500-4000rpm at freeway speeds.

C56 has closer spacing where it matters, and C160 is better again, and the prices are indicative of that. For the peaky 4age you’ll appreciate a shorter 3rd and 4th.

We’re not talking drag applications here, we’re talking a stock silvertop 20V. The syncros are not weak, but they MAY be on the way out. My syncros have got 248k on them, and with maintained oil and reasonably matched shifts the gearbox is still quite nice to drive.

Strength is absolutely no issue, as said, it’s a stock 20V, and both the C52 and the C56 gearbox recommended came attached to this engine. Both will be strong enough for modified NA engines (within reason/commonality). There is absolutely no need to rebuild any of these gearboxes with stronger 2nd and 3rd, or any gear for that matter.

Get a C56 if you find a reasonably priced one and you can afford it, get a C52 if you can’t. Either way, try and find a good condition/low kilometre one if possible.

[Vios-GT_07]

to each his own i say

i'm used to cruising at 100 km/h at lower than 3000 rpms.. hence my opinion the ratios dr is quite high.. shifting between gears, it really feels close as i shift at 3000 rpms and find i have to shift in short(er) periods of time.. i'm not saying it's bad, in fact i quite prefer higher gears and closer ratios.. it's cruising at higher rpms (with a loud exhaust especially) that takes a while to get used to

just that, at least 4/5 cars i've driven with a GE engine (3S, 4A, 1J, 2J) have worn synchros.. and i have to say that no factory gearbox is designed for continual hard-shifting (unless u talking dog boxes, but they do still wear out).. if u're asking for a box to withstand abuse and last long, i'd say get it rebuilt with stronger synchros as most people i know who have GE engines tend to use that power.. if u're careful and drive miss daisy, it's not needed to.. hope my rephrase makes more sense...

[finney]

my g/box in my 20v is a C56 to my knowledge.. i do have my doubts after compraing dyno sheets to see where peak power is vs speed.. but back to what I was originally going to say...

my gearbox has copped a decent amount of abuse.. drags at wsid a couple of times, 3 wakefield days and as some know a decent amount of spirited driveng and I have not had any issues with my syncros.. the box now was approx 130k km's on it and has only had one oil change in the 40k that it's been in my car.. as long as your are nice to it (rev match on downshifts rather than throwing it in) it'll keep on going. Mine is also just using a standard exedy clutch that has also been very good with the abuse my g/box has taken. The only thing i've found to have suffered has been engine/gearbox mounts.

essentially what i'm saying is show it some respect and don't go flatshifting every change and it will last.

and also as far as i can see with a stock 4AGE there is no point in going for strengthened gears as you have put it... most I would do is a HD clutch.

[d3v147]

Sorry I haven't been in to check this thread for a couple of days - I've been putting the gearbox in (On axle stands with only 2 jacks :S).

I ended up just getting the c50 box off my mate for $250. Ratios seem pretty tall but it does 100km/h at about 3200 which seems ok (Standard SX rims and tyres sizes). All syncros seems to be fine so I am happy.

I would have to say that this is the worst car I have ever had to work on, I think I wore out the 'book of bad languge' and lost a lot of skin, so I think i'm going to treat this gearbox like glass now!

Maybe its easier to drop the crossmembers and lift the shell off the motor? Has anyone tried this?

[Vios-GT_07]

that's good mate might have a think about that C50 box now as i like the idea of having lower revs on the freeway, doing a fair bit of that now..

from what i remember, the best way to do this gearbox job is with hoist so hey it's a good effort to do it your way.. i'd prolly have screamed more in different languages

i've never wrecked any synchros on any gearbox, i just get them with worn synchros though.. so yeh.. there are more people who wanna go fast then those that know how to

[Hiro]

that's good mate might have a think about that C50 box now as i like the idea of having lower revs on the freeway, doing a fair bit of that now..

from what i remember, the best way to do this gearbox job is with hoist so hey it's a good effort to do it your way.. i'd prolly have screamed more in different languages

i've never wrecked any synchros on any gearbox, i just get them with worn synchros though.. so yeh.. there are more people who wanna go fast then those that know how to

The only difference between a C50 and a C52 is the first gear ratio: the other 4 gears are the same. So unless it's got a taller final drive, the C50 will give you the exact same revs on the freeway, combined with ridiculously short gearing in first (3.545 compared to 3.166)

Rollaclub FAQ has the gear-ratios for the C-series
http://www.rollaclub.com/faq/index.p...Manual_Gearbox

[Vios-GT_07]

ehh? didn't know that.. could've sworn they were different..

thank for that + rep