You're going to take it on the track again before hooking up the oil cooler? I'd love to see the temps, but it I hope you don't push it too hard if you start seeing the temps rise past 210F.

 

Yes I did, last time I checked MT-90 and Shockproof had a viscocity of 90 and a weight of 75 ... that why I said what I did

I'm with Fireball on this ... the 4th gear will fatigue relatively quickly at that torque level, eagerly waiting track temp reults ...

 

17th of this month I have an event.

I will have a switch on the cooler.

 

Nice. Do you have a bypass T-stat or an adjustable flowrate pump?

 

I'm going to try hooking it up to my fog light switch so I can see on the dash if the pump is on or not. We'll see how that works out.

I just need to get off my lazy *** and get all this done.

 

I agree, but I believe the short bursts aren't anywhere near representative of real track use. This is why there's numerous Evo drag cars that can run hard extremely hard for hundreds of short periods and never see problems... The gears do fatigue, but the heat is accelerating the process dramatically.

I was watching an episode of Best motoring where they pitted several cars together for an "enduro" and they were marking the danger zone for engine oil at 140°C I believe... That's 284°F. The Evo has the best temps of the group because of it's external engine oil cooler. The transmission was not mentioned.

If that's where engine oil can begin to fail, our temps must be getting hotter than that, which will be surprising, especially considering there's no "controlled fireballs" heating the tranny. The teeth face pressure must be overcoming the oil's lubricity. Unless the temp sensor is mounted directly on the gear we have no idea what temps the gear teeth faces are seeing, which is undoubtedly much higher than we will ever see from a sensor mounted to the case or a drain plug.

 

AGREED

I only said that I hope temps stay below 200*F because the temperatures achieved between the teeth can climb above that quite a bit. In general you don't want hardened steel getting above 350*F.

 

Dont mean to stir the waters here but if you would take a look at who was running what fluid at the time of failure and under what driving conditions this will clear up 95% of the evo owner population that needs not worry about it.'

Id venture to guess most people running modified cars in road racing conditions also changed their tranny fluid to something else (more mods the better right!?!).
Id like to know if there was a failure on the OEM fluid.

 

I don't know what they are talking about. My '05 MR has 27K miles and the 6speed tranny is perfect. Never had any troubles, zero problems, works great. Maybe if they shift it very hard and put huge power through it, it might fail. Perhaps they are taliking about a particuilar tranny with problems, but definitely not all of them. Personally I think they are full of $hit and they don't know what they are talking about. I would not pay any attention to them. Just drive your car and enjoy it

 

Yes, the invoices for repairs that I have, warrtalon has, TTP has, and a couple others have are full of it too.

My 6spd was working great for 31,000 miles and 10 track events too. Then it melted.

 

i know quite a few people running different fluids in the MR tranny and i bet that doesn't help any since in the book it states factory fill(diaqueen super multi gear 75-85 GL-4)or EXACT equivilent. i stuck with an exact equivilent, just fully synthetic, castrol syntorq LT. it's 75-85 GL-4 synthetic and has worked flawlessly for me for 35K miles, some drag, some autox. no road racing...yet. plan on it next year, and hoping the trans holds up. if not, i don't know wether to rebuild by shep or go shep 5-speed. it would just suck having to go 5-speed and have a $4K 6-speed sitting in the garage broke that no one wants, ya know. i guess it will depend on the extent of damage and cost, but i'm not too worried. i like my 6-speed.(except when i change the clutch! those that have done it know what i mean!)

 

what whp and torque numbers are you guys putting down? that has to come into play some. i'm hoping mine will hold up a little better since i'm not modded a whole lot, maybe 300 whp.

 

I can't speak for the others but my car made at the time of 6spd failure:

302whp/290wtq on 91 octane

320whp/300wtq on 100 octane

Mustang dyno that reads close if not the same as the buschur mustang.

I am making a bit more trq now on 100 octane with a updated tune. How much I'm not sure until I get it back on the dyno.

 

mine was stock hp on stock fluids.

 

I agree with you. What the hell is the "intended purpose" for the EVO? I always thought it was a sporty 4 door sedan mainly intended to be used as a daily driven passenger car.... I drive it almost every day and I've yet to drive it in any type of track event. That's right, no drag racing, no autoxing, no track days. Personally, I think the whole car is more than adequate fotr it's purpose and actually it has way more performance than 99.9% of drivers would ever use. The tranny is perfectly strong as is the rest of the drivetrain. Even with my stock engine pushing 249 whp on a DD dyno, everything is still in good condition. I suspect it will serve me well until I get my EVO X with the POS DSG tranny

OTOH, I could be wrong and the 6 speed might crap out on me anytime now... Still, if it breaks, it should be repaired under warranty which is still valid.... BTW, I wonder how many 6 speed and 5 speed trannys haver failed as a percentage of all the EVOs out there? Also, I wonder if they fail under normal (street driving) conditions?