We started to adjust the fuel this morning and the clutch finally started letting go. It starts to slip as soon as the boost comes up and never recovers so we gave up.

We'll pull the clutch asap and post some pictures.

-Jeff

 

so it lasts about as long as the ones on a 8/9?

 

Looks like Mitsu is still using garbage clutches like always

 

That's disappointing, but nothing that an upgraded act or exedy won't fix.

 

yes, but it voids your warranty on the whole drivetrain..

 

Odd I have 50+ launches, and 30K miles on a BPU Evo and no issues with my stock clutch yet.

If you race it and mod it don't be so upset if the clutch goes. It happens on any modded car that gets raced. This is nothing new.

 

^^^^^^^^^^^^

 

Are they still using a restrictor pill in the clutch slave cylinder like on the 7/8/9?

If so, pull it out now and prolong the life of the clutch.

 

To clarify:

This little pill slows the flow of hydraulic clutch fluid actually delaying the engagement of the clutch.

When you lift off the pedal, the clutch has not fully engaged the flywheel, so if you accelerate too quickly after changing gears, the clutch will slip against the flywheel until the little pill allows it to fully engage. Over time, this will lead to excessive wear on the clutch, and was undoubtedly the cause of all of the clutch problems when the Evo first came to the US.

Removing the clutch restrictor results in quicker, more precise engagement of the clutch, so when you lift off of the pedal, the clutch actually engages fully, thusly allowing you to drive the car more agressively without fear that the clutch will suffer excessive abuse from slipping when you're actually using this little restrictor pill.

Mitsubishi incorporates the restrictor from the factory to aid in driveability, but clutch life can suffer tremendously if you don't realize how slowly the clutch actually engages with this restrictor.

That is not to say that removing the restrictor will decrease diveability to any extent that is unbearable beyond other cars that don't use them either. Clutch engagement might take a little more getting used to as it will bite a bit harder initially, but you can dramatically increase the life of the clutch. Maybe that's a fair trade-off.

So, the question remains.

Does anyone know if the X retains this restrictor or not?

 

On the restrictor topic...

I took the restrictor out on my VIII and I kept the restrictor in on my IX, and i like having it. I launched my IX 40+ times, with stage 1 power, 1.7/1.8 60fts (I know thats not great) and with 40K+ miles my stock clutch was fine. fyi, the VIII had less power, same amount of launches, but slower ones and no restrictor and the clutch was also fine at 25K miles.

This is my opinion about both ways. In my VIII without a restrictor i was always worried about breaking stuff, resulting in more slip and slower launches. In my IX with the restrictor, i was never worried and would drop the clutch way fast and let the restrictor do the "slipping" that was required.

I would put my money on the fact that the X has a restrictor too.

 

Yea i know.. My stock clutch is now slipping at 15psi, 27500 miles on it.. Car went 11.7 x2 on the stocker and some other street launches.

 

that was fast...

 

Well.... About the restrictor pill it would have nothing to do with the clutch slipping on the dyno seems how they drive up through the gears to the desired gear 3rd or 4th to do the pull. They are in the gear then bring the car up to usually around 3000 rpms start the test and run the car up to redline or whatever rpm... The restrictor pill only had to do with how fast the clutch will engage no effect once clutch had fully locked up. That was my understanding of this restrictor pill.

 

Are you sure this is true? I had a complete rebuild done on my transmission for the synchro issue, and I had a twin plate exedy in. It didnt void my warranty. I think the reality is that everyones experience is different based on the mechanics thoughts of how you drive your car. Since the clutch isnt covered under the base warranty, you can change it out at any time. By not using a Mitsubishi approved clutch though, you may run the risk of being questioned about it. But even if you blow the tranny, they would still have to prove that the clutch caused it.

This is not to say that racing your car in the first place is ok, since it does say that Racing WILL void your warranty right in the manual.

Im also not a big fan of removing that restrictor pill, since it does protect your tranny from a lot of potential damage. With a twin plate exedy on my car I was pulling 1.6 - 1.8 60's no issues.

TT, would you say the issue is you now have more power then the clutch can handle?

 

yes it did void the warranty, on the VIII and IX. So i think it will on the X too./ in jersey/