SST tranny overheating at the tack! Mitsu need to find a fix!

[RoundPro]

Originally Posted by DonMitsu

After Speaking to a Mitsubishi engineer today he explained a trait of the SST that could easily cause this. When the gas pedal is activated the clutch is fully engaged, when the brake pedal is touched the car attempts to feather the transmission, when the car tries to fully engage the clutch and feather the clutch it will quickly overheat. ANyone who has been on the track and paid very close attention to their use of heel and toe and knows for a fact they have not used your left foot to brake, and still had this issue I would like to hear from. I assure you the S-Sport mode was designed for the track only and if it's not functioning properly the vehicle needs to be fixed.

Thanks for your involvement and quick response!

[Billy@EnglishRacing]

Originally Posted by DonMitsu

After Speaking to a Mitsubishi engineer today he explained a trait of the SST that could easily cause this. When the gas pedal is activated the clutch is fully engaged, when the brake pedal is touched the car attempts to feather the transmission, when the car tries to fully engage the clutch and feather the clutch it will quickly overheat. ANyone who has been on the track and paid very close attention to their use of heel and toe and knows for a fact they have not used your left foot to brake, and still had this issue I would like to hear from. I assure you the S-Sport mode was designed for the track only and if it's not functioning properly the vehicle needs to be fixed.

way to find the answers! kinda interesting how it works.

[RoundPro]

Originally Posted by EvoHung

That sucks. I wonder if it was just a defect on your vehicle or a poor design on the SST.

None of the above. New technology, just need a few tweeks. Had to deal with the same kind of problem with my E46 M3 with SMG.

But the SST is SO much more refine than the BMW SMG tranny! Once fixed, with the proper suspension/tires/brake pads and an additional 40 to 50WHP, the car will be very competitive on a race track!

[gunzo]

Originally Posted by DonMitsu

After Speaking to a Mitsubishi engineer today he explained a trait of the SST that could easily cause this. When the gas pedal is activated the clutch is fully engaged, when the brake pedal is touched the car attempts to feather the transmission, when the car tries to fully engage the clutch and feather the clutch it will quickly overheat. ANyone who has been on the track and paid very close attention to their use of heel and toe and knows for a fact they have not used your left foot to brake, and still had this issue I would like to hear from. I assure you the S-Sport mode was designed for the track only and if it's not functioning properly the vehicle needs to be fixed.

How do you heel toe on a SST ???

In S-PORT mode all these are taken care of by the PCM .. you downshift, it blips for you, you brake below certain speeds it changes gear .. there is no feather

In NORMAL mode, you are correct ..

Does 12 laps of 3mile course counts as overheat with no heel toe ??
It overheated after 12 laps

An extra fan HELPS ALOT (but you get a stupid whistling noise when the fan comes on because of the airflow)

[smgevo]

Same thing happened to me with the MR. Can the aftermarket tuners post here their solutions to the problem? Different sized tranny oil coolers and flow design. Are they available now? How much? When can I get one delivered?

[fastkevin]

Originally Posted by DonMitsu

After Speaking to a Mitsubishi engineer today he explained a trait of the SST that could easily cause this. When the gas pedal is activated the clutch is fully engaged, when the brake pedal is touched the car attempts to feather the transmission, when the car tries to fully engage the clutch and feather the clutch it will quickly overheat. ANyone who has been on the track and paid very close attention to their use of heel and toe and knows for a fact they have not used your left foot to brake, and still had this issue I would like to hear from. I assure you the S-Sport mode was designed for the track only and if it's not functioning properly the vehicle needs to be fixed.

Hmmmmmm.... with that transmission, using your left food to brake would be the most efficient way to drive it on the track. Am I reading correctly that Mitsu says that is the wrong way to drive that trans?

[hancheyb]

I was at Eagles Canyon last weekend and noticed the overheating as well. I'm going back Sunday with the BMW club to try out Don's suggestion. Let's face it, the computer can't read your mind. It doesn't know when you hit the brake if you're about to decelerate and downshift or you're just trying to get the car to turn in. That "half engagement" stage of the clutch is why the SST is so much better (on the street) than the BMW SMG (which isn't even a comparison IMO). The car I was driving was plowing like crazy so I know I was tapping the brake in mid corner.

As a secondary experiment we're putting a 5.2" Spal fan on the transmission cooler with a switch. Once I try the official fix, I'll go back and drive it with the fan on and see what happens. Not enough time to put a temp gauge on it so that might be Step 3.

[TTP Engineering]

Originally Posted by CBRD

i need fitting sizes and we could build something.

cb

Would love to see the high quality craftmanship of an oil cooler from CBRD SpeedFactory.

If they are anything like the radiators, it should be an excellent product from CBRD.

[goofygrin]

nevermind I'm reading comprehension deficient.

[weneversleep]

Originally Posted by DonMitsu

After Speaking to a Mitsubishi engineer today he explained a trait of the SST that could easily cause this. When the gas pedal is activated the clutch is fully engaged, when the brake pedal is touched the car attempts to feather the transmission, when the car tries to fully engage the clutch and feather the clutch it will quickly overheat. ANyone who has been on the track and paid very close attention to their use of heel and toe and knows for a fact they have not used your left foot to brake, and still had this issue I would like to hear from. I assure you the S-Sport mode was designed for the track only and if it's not functioning properly the vehicle needs to be fixed.

Interesting. Thanks for the response.

I haven't taken my MR on track, and I don't plan to until the warranty runs out. Hopefully by that time there will be solutions/techniques for using the SST on track.

I have a few questions, though:

1. What does the SST clutch do when the gas pedal is lifted (i.e. no throttle)? Disengage the clutch(es)?

2. You say to "pay close attention to your use of heel/toe". My understanding is that the SST will blip throttle for you (and it does in my experiences on the road), so manually blipping during braking (while the tranny is downshifting) isn't necessary. Is this what you mean by proper heel/toe technique with the SST--i.e. _don't_ heel/toe?

3. I do a little left-foot braking in my M3 (manual tranny) on the track, and I really planned to do a lot more of it with the SST, obviously because there is no clutch pedal. But, the idea of LFB is usually to get the rear rotated out a little more going into a corner. Are you saying that, because of the SST clutch actuation, that we shouldn't LFB at all?

Thanks,
--michael

[CBRD]

Originally Posted by TTP Engineering

Would love to see the high quality craftmanship of an oil cooler from CBRD SpeedFactory.

If they are anything like the radiators, it should be an excellent product from CBRD.

can you get me fitting sizes?

also, we have our X radiators available as of middle of next week, and our evo 8/9 radiators now accept the stock fan shroud!

(we have subie radiators also, X fmic coming)

cb

[Robevo RS]

mitsubishi didn't denied cars who did go to the track for racing , before?
Now its in the owner manual :
"S-Sport
S-sport mode is DESIGNED to be USED while driving on CLOSED CIRCUIT TRACKs.
DO NOT use this mode ON PUBLIC ROADS. "

How odd is that?

So i can go to the dealer and say , hey i did everything what the owner manual told me, but my tranny is cooked. So can you replace it to me under warranty????

Hilarius...

[DonMitsu]

Originally Posted by weneversleep

Interesting. Thanks for the response.

I haven't taken my MR on track, and I don't plan to until the warranty runs out. Hopefully by that time there will be solutions/techniques for using the SST on track.

I have a few questions, though:

1. What does the SST clutch do when the gas pedal is lifted (i.e. no throttle)? Disengage the clutch(es)?

2. You say to "pay close attention to your use of heel/toe". My understanding is that the SST will blip throttle for you (and it does in my experiences on the road), so manually blipping during braking (while the tranny is downshifting) isn't necessary. Is this what you mean by proper heel/toe technique with the SST--i.e. _don't_ heel/toe?

3. I do a little left-foot braking in my M3 (manual tranny) on the track, and I really planned to do a lot more of it with the SST, obviously because there is no clutch pedal. But, the idea of LFB is usually to get the rear rotated out a little more going into a corner. Are you saying that, because of the SST clutch actuation, that we shouldn't LFB at all?

Thanks,
--michael

1. It queues the next lower gear

2. You are correct there is no reason to heel/toe

3. The M3 tranny is actually using the same Borg Warner components, but it uses different software. LFB will quickly cause the TC-SST to overheat because of how Mitsu has programmed the software to respond to brake and throttle input. I have been talking to Mitsu engineers trying to find the quickest and best solution. Long term solutions that may evolve include a reflash that would change how the transmission responds to brake and throttle input, and/or a larger capacity transmission cooler.

I'm constructive feedback on this post so I can help the engineers find a solution that does not jeopardize the Evo's highly praised shift points and shift speeds but will help keep the tranny from over heating.

Thanks for your input

Don

[weneversleep]

Originally Posted by DonMitsu

1. It queues the next lower gear

2. You are correct there is no reason to heel/toe

3. The M3 tranny is actually using the same Borg Warner components, but it uses different software. LFB will quickly cause the TC-SST to overheat because of how Mitsu has programmed the software to respond to brake and throttle input. I have been talking to Mitsu engineers trying to find the quickest and best solution. Long term solutions that may evolve include a reflash that would change how the transmission responds to brake and throttle input, and/or a larger capacity transmission cooler.

I'm constructive feedback on this post so I can help the engineers find a solution that does not jeopardize the Evo's highly praised shift points and shift speeds but will help keep the tranny from over heating.

Thanks for your input

Don

No, thank YOU for YOUR input! I appreciate the answers.

(And, just for the record, my track car M3 is an old E36 M3 with a manual transmission, not the new one with the DCT. You can tell Mitsubishi that I actually CHOSE the Evo X MR over the new M3 sedan based on the way the Evo drove, in terms of handling and even the way the SST tranny worked.)

--michael

[goofygrin]

Plus the fact that it was $25k cheaper doesn't hurt either