I emailed Arnside motorsports to see if they offer anything for the MR. I know I used to have a bookmark of someone that did, though its possible it has been taken off market now. I dont mind going from a 6 speed to 5 speed personally, especially if it means I am going to have ALOT larger gears in the 6 speed case. This is all too familar from my days with Subarus, so anything to avoid it is welcome. The thing is who is gonna buy a used 6 speed for a swap with threads like this? Anyone with one has to have an alternate means for "beefing it up" and if all it is a gearset change versus everything entailed in swapping to a 5 speed (and then having a broke 6 speed on your garage floor), why not?

 

Well man I don't know about you but I think alot of us that have the MR are into
road racing which is why we are concerned. I mean this is why I purchased one,
MR stands for Mitsubishi Racing....not Mentally Retarded like I'm now thinking for
them using this gearbox. You are correct though, if you keep the car relatively
stock power and don't road race you are alot less likely to have a problem. For us
that do road race we are pretty much screwed. I'm sticking with the 6-speed till it
breaks though, I'm gonna try to get by with frequent fluid changes and maybe a
cooler but only time well tell when I need to upgrade to the 5-speed. Unless some
other solution emerges by then.

 

Thoery ... Let me guess it was a shop car . How much HP was it putting down also ? Heard the gear may have been defective also. Just because one 6 speed breaks drag racing doesnt disprove my theory. I guess next time i go to the track ill romp on it untill 4th gear comes around .

 

Again this seems to be mostly confined to 8 MR's. Has anyone with a 9 broken their 6 speed yet?

 

I use to own a 03 wrx with the "weak" tranny and motor. I put down 300whp which meant my motor was on the brink of destruction according to nasioc. And that my tranny was going to go at any time. 70,000 miles later still same tranny and still same motor. And that car was beat on every day

 

Has shep or jon@tre opened a case on a IX MR to see if they are different from a VIII?
I'm betting they are the same but who knows.

 

NASIOC=Internet Mythmakers...dont get me started on them. Thats a whole nother thread by itself. I am not saying I broke mine either...I made consistent 12'21's on mine with 225's and no breakage. That was more a comment on other cars that had this "scare".

 

lol. kaa-ching!

 

All it takes to find out if the IX MR gears are any different than the VIII MR gears is a phone call to a helpful Mitsubishi parts desk to see if the part number for the VIII MR gear components are any different than the IX MR gear components. I think that Spins4 works at a parts counter. I'll send him a PM. I played this game quite a bit when I had a Subaru 5MT. :-)

 

Probably not enough mileage yet, all the evo 8 MR failures just now started cropping up.

 

tru.dat

 

ToMuchBoost: Spoken like a true noob. Here is a hint, although Warrtalon knows a quite a lot of things about the EVO but he isn't a tranny expert. The person you should listen to is GEARS when it comes to the workings and the internals of the transmission. Synchros issues (grinding) have very little to do with weak gears. Torque is what you should be concerned not HP when it comes to the longevity of your gears. You can make a lot of HP with very little torque.

I don't want to get into details of why some WRX trannys lasted longer than others but if you read the info on this thread carefully you will understand why. I suggest you re-read a lot of things as there is alot of good info in this thread.

So I guess it comes down to the nitty gritty, don't produce more than 390ft.lb of torque at the crank or else you will severly shorten the life of your 4th, 5th and 6th gears in the 6 speed. How that equates to WTQ is anyone's guess. We have a range of anywhere from 18% to 30% parasitic drivetrain losses. I'll go with 25% and say keep your WTQ below 292ft.lb ...

 

I have over a couple hundred launches (solo, 1/8 mile, 1/4 mile), numerous solo events, winged warrior, and easily over a hundred drag runs (half of them in the mid 11 sec range) every single one of them no lift shifting. David Buschur asked me if I ever take my foot off the gas. I also have 10,000 spirited street miles. I drove my Eclipse in the same manner and had the tranny rebuilt three times and went through four clutches in less time so I'm pretty freaking happy with the 6spd thus far. I would definately attribute some of it to my Exedy twin disc as well.

 

I really think its heat that weakens the gear.

 

Spoken like a true noob ? Wrx tranny flexs and the gears dont line up correctly and end up breaking.. even people with RA gears sometimes break thoes to because its a case problem not a gear problem.

As for the grinding i never said 5 speed gears were weaker. I said they tend to have more problems aka grinding ect.

It seems to be heat is the reason the 6 speed gears are breaking not that they are weak.. you are starting to remind me on the guys on nasioc that think they are guru's ..