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hello, i'm sorry but i don't own a protege (ducks from the stuff being thrown at him, heheh) but i own a ford escort zx2, which uses the mazda g5m transmission.

i'm just trying to find out more about these mazda transmissions, because we (the zx2ners) are in need of something stronger. quite frankly, the g5m is not working well with our cars and is barely holding together with the stock 130hp that our zetec motors are rated at, and those who have gotten much more power have gone through multiple tranny's.



what i really want to know is, are there any trannies relativley swappable with the g5m that can hold more power? what about the g15m-r?

any info would be great.

get a protege!

geez guy ligten up... whats stuck up your ass?
my comment wasnt supose to be taken so seriously....:mad:

hey

well, i not sure what exactly breaks first, but we have definatley have numerous problems. i honestly don't know too much about trannies, but i'm trying to figure all this out.

according to one person, some zx2s actually came with the g15m-r, but it isnt much different than the g5m

i dunno, i'm just trying to gather differnt info and see what options we have, but i think the only stronger tranny that will work with ours is the focus ones

if my tranny ever blows, who knows, maybe it won't, heh, btw, i'm supercharging my zx2, the first one :) , but if it ever does, hopefully i'll have saved enough $$ to swap in a focus tranny, or there are a few shops i've heard of that can "bullet proof" the trannies. (protech, level 10)


but still, if you guys know of any trannnies that are swappable with the g5m/g15m-r, and considerably stronger...let me know!

ha ha. yea its a long shot

thanks anyways :)

As Jesse said earlier, the main differences are in the bell housings I guess, but the guts are similar and can handle similar loads...

the Mazdaspeed Protoge uses a version of the G-15M-R gearbox (only difference I think is the LSD, plus a stronger clutch used...which only increases the stress on the other box internals) and is more than enough to handle the FS-DE(T)'s 170hp and more importantly the 155lb/ft of torgue with a full 50k mile warranty...

My guess is that the ZX2 owners you are talking about are doing a combination of adding power, but worse shifting to hard and unsmoothly. G-series boxes are prone to shift fork problems when hurried beyond what they can handle, meaning when they are shifted way to hard. the case is aluminum also, and a few guys I know of have completely cracked them...

I dont own a Mazda either but I Want a RX8, <ducks>:D anyway the G5M tranny can only hold 250 Hp if it is babied but usually what goes out are either the shift forks-becuz ppl shift too hard and the synchros which wear out faster when ppl dump the clutch at hgh rpm's or is throwing a lot of power to the wheels... I also would like to know if i can swap out my tranny or somehow make it stronger becuz I'm gonna go heavily modded and need to be prepared:)

Get an auto.

Okay the big problems that we are having with the trannies on the zx2 are the differentials keep going due to weak spider gears and the syncros are in some performance applications of high reving are literally flying apart at 7600 rpms. Shift forks are only a problem for those who shift too hard or too fast. The way we figure it if we were to get better syncros and differentials the shift forks would have less work on them anyways because of the faster syncros and the differentials would'nt go up in smoke so quickly.

I also found this on mazda website that may be useful in the future.

The Mazda G5M five-speed is designed to give the four-cylinder engine line-up crisp, short-throw shifting feel and low shifting effort in true sports car style. It features new dual synchronization - a high power synchronization feature for responsively quick shifting, easier shift effort and precision engagement - for the first and second gears.

The auto is weaker and not as aggressive as a MTX and if the G15M-R is stronger, how much would it run on price? Or is cheaper to have a machine shop make stronger synchros and shift forks and drop a LSD while I'm at it?

The G15-R is slightly more sturdy and you could pick one up off of car-part.com for probably 400-600 bucks look up the mazda protoge third gen. Personally I would pickup a ford escape tranny which has the stronger differential gears in it not to mention more agressive gearing. But make sure you swap out the 2nd gear. Throw a lightwieght flywheel in there along with a a quafie lsd and you should be good to launch your hearts desire out. OH by the way syncros are worn out only when you say rev it really high and then shift it into a gear. If you rev match you will have far less problems with your syncros. Thus the reason if you want to shift faster you use an lightwieght flywheel so your revs drop faster.


Also if you get an atx and invest about 3k into it you could make a virtually indestructable tranny that when you are done with it you can sell it for about half what you paid for it easily.

With the G15-r I might as well get it cryo'd...and with the Escape Tranny I heard you can only get about 25mph out of 1st gear

I only get about 30mph out of the zx2 tranny. So its not a huge difference.

Are you for real? I Get 35 mph out of 1st at redline

I dunno. ALl I know is thats what I get out of first gear.

Does anyone know where I can get the MazdaSpeed LSD?

err... a mazda dealer? :p

How much do you think it woulld run me, i'm asking cuz I dont have time to go to a dealer until next week?

The dealer gets them for about $400 USD from what I remember, so I would guess you could get one for between $500-600...A bargain by torsen LSD standards...

I wanna hear from any one here who is putting some good amount of ponies under the hood, how did you improve on these shitty Mazda trannies from not breaking?

This is were things are getting skewed and misleading...No one on this board that I know of has put enough power/torque into a G-15M-R 5-speed gearbox to destroy it becuase of that...Most of the people having gearbox problems had relatively stock engines with the exception of a few bolt-ons and THEY destroyed the box...IMO it is shifting habits that are limiting the gearbox so far for the most part. It is still unclear to me who coined the fact that the box can only handle 225whp or whatever and I have never seen anyone on this board with a 225whp FS/G15M-R...The aluminum case is definately not the strongest, and there are some potential weaknesses with the spider gears of the diff...but other than that it is fine...The notion of weak syncros and shift forks have little to do with the maximum amount of torque it can handle and more to do with how much bullshit it can take from a poor driver...Shift it like an idiot and chances are it will break, regardless of whether it is stock or heavily modified...

In comparison there are quite a few 2nd gen. Probe GT owners with upper 285whp numbers and nearly that much torque, on a gearbox that is for the most part identical...same internals, same ratios, similar aluminum case...

I don't know why everyone is worrying about it so much, especially when none of us have nearly enough power to make it an issue...I am just simply pointing out that a lot of these issues about gearbox strength are more related to driver abuse than engine output...

How strong is the auto tranny (shiftmatic)?

I'm only aiming for about 200-250 whp just as a sleeper on Boost, just asking cuz i wasnt sure if i might break something cuz of that. i'm a good shifter though, i shift softly but quickly with the flick of the wrist. Also i heard with a short shifter, do u wear out the synchros quicker or is this also of poor driving?

he probe uses a MTx75 transmission which is significantly stronger than the G series transmission.

the syncros only have to do with making the layshaft match the speed of the gear you want to enter. The short shifter has no effect on that. I presume if you are used to double clutching with the regular one and do it less effectively with the short shifter it would cause more wear on the syncros.

wrong

The short throw shifter is directly related to this...syncros don't just work on a down shift, and not that many people that I know of double clutch while upshifting... A STS will allow you to upshift much faster and make the syncros work harder in order to match the dog teeth before the gear is selected...

That is what I thought, at least for 2nd gen Probe GT's...

And FWIW There are just as many shift fork problems with stock Probe GT's/MX-6's/626 V6 as we have...and I didn't think anything was significantly stronger...

Thats why the zx2 owners did'nt get the tranny cause it was the mtx75. Its the same as the Focus.

You're not making any sense to me.... but the probe didn't use the MTX75 transmission.

I guess I could be wrong I just remember a post somewhere about the Probe using an mtx75 it could have been the GT verison I was thinking about

The MTX75 is something that comes on mainly european ford cars, the ford focus (which came here from europe.), and the Cougar.