5 Speed Auto

[Basti]

i was just looking up specs on r33's the other day and i noticed that some came with a 5spd auto instead of a 4spd like in my car. i also noticed this is only in N/A cars, namely the GTS25 TYPE G and TYPE G SE sedans and the GTS25 AND THE GTS25 TYPE S coupes. im assuming they are series ones, since there is no mention of any of these post '96.

now to get to the point. is it feasible to chuck one of these in a turbo model coupe of the same time frame? i have a auto type m, and purely in the interest of fuel economy i am considering this. few q's to guide discussion:

1 how hard are they to find?

2 are they different in any way to the turbo slushie? difference b/n sedan and coupe?(dimension, weight, fitment etc)

3 cost wise is it cheaper or more expensive than a manual conversion? (guessing cheaper)

4 will i have to change my ecu to run it?

thanks fellas.

btw i got the model info from here

[Modena]

Id like to know this too.

[Basti]

anyone?

[Basti]

bumpy

[linedup33]

i had one in my na r33

[08yannch]

well that is the first that i have heard about a 5spd auto in a skyline i am intrigued

i also want some info in there 5spd autos

sounds kick ass

[rgr34]

i heard about these to yet to see one thou...

[08yannch]

the idea of a 5 speed auto on a skyline is just incredible in my opinion

[iseekool]

I've heard of it before in r33s, its probably quite rare. I also read somewhere the trans is physically longer too so you will need a shorter drive shaft. THe only trans i've found that "seems" to match this description is "RE5R01A or RE5R05A" - most likely the ones in the r33s - there is also a "Jatco JR507E transmission - but I think this is for later cars like the 350Z"

Unfortunately all I can recommend is more googling in regards to your conversion - I have no more info

[UNR33L]

i had one in my old 4 door n/a, it has D 3 2, instead of D 2 1, if that makes sense. (so i figured it was)

(it was annoying doing a burnout cos id chuck it in 2nd being the lowest and it would spin up first, then change to 2nd once the revs got high enough and being a n/a it would just bog down and go fail.)

the thing is id count the gears and i could still only count 4 + the over drive :s weird.

i wouldnt really bother, my old auto box was shit house anyway.

although cruising at 110 with over drive on it would sit pretty low from memory compared to my manual. 2000-2500rpm lower ruffly

but yer thats all my experience with it..

[rgr34]

maybe it would be just the overdrive button.....that would be cool in a r34 auto in my experience 4 speed tip tronik box seem to rev out to much, not very cruisey needs a fifth gear...

[Rb30detBMW]

I got a 5spd auto box over the weekend by mistake and now wondering how hard it is to fit ecu wise? Any ideas?

[StevenCJR31]

MV automatics should be able to help

[GTSBoy]

You won't make it work with the 4 speed TCU. Would need something that can handle the extra solenoid(s).

I should point out that the NA autos (and probably the 5 speed in particular) probably won't hold up to the torque of a 2.5 turbo for very long. The 4 speeder is a marginal enough proposition behind a stock 25DET, let along a boosted up one (and how many standard ones are still running around?).

[Rb30detBMW]

Yeah that's what a few people have said, there is a few standard ones around still but people want way too much for them, rather do a manual conversion for a few extra hundred, but just a daily do wouldn't mind keeping it a auto for now but the gear ratios look pretty good where 1st in the 5 speed is 3.8xx and 1st in the 4 speed is 2.5xx and then top gear in each us 0.69, as far as I can see tho the wiring for both are the same but happy to get a ecu to get it to work but can't find any

[Rb30detBMW]

And I've heard they are actually quite strong, so maybe handle the turbo?

Also heard the torque converter locks up acting like a 5th gear giving it 1 to 1 ratio, I could be wrong tho