I don't know if this is normal or not but I recently had my 2010 MR transmission replaced. The unit was used and was supposed to have only 11,000 miles. The issue I am having is during light take off there is chatter stick and grab sticking grab is the best way I can describe, if you throttle up the car quickly but not an aggressive wide-open throttle the car will run through all the gears perfectly fine, however if you choose a gear and you give it to gas quickly the RPMs will flareup there'll be what is obvious slipping and then things will catch up you could say and the car will proceed forward as normal, it's as if the transmission is not giving enough pressure to firmly locked in the clutches at first, but then eventually finds the pressure in need and will hold that pressure through all the remaining gears, just a note I am running ffl-2 transmission fluid I had positive results with my original transmission towards the end of it's life could this will be a factor. I also have an aftermarket transmission cooler and the quantity of fluid was adjusted for this.

I have also noticed the transmission will not shift into super sport mode anymore or do launch control. Ironically this seems to of happened after I took the car to the dealership for a recall reflash of the computer, or the issue may just be coinciding I do not really use either of these options that much. I have absolutely no codes for any transmission codes of any sort, the new transmission was also married at the dealership after it was installed.

 

Honestly dont know what to tell u, im curious as well what the issue is. I wonder if it has something to do with your torque dampening springs being broken somehow? How much power you making? Id call Kris at south side performance

 

All the car has is a lightweight aluminum flywheel 3 inch exhaust system and a cold air intake with upper and lower pipes I also have a Cobbs reflash but it is stage zero. .

As I said the clamping force in beginning with the clutch is very low but then if you ease into the throttle you can go hard with all the other gears it is just the initial get up and go there is a lot of clutch slipping. I am going to try changing the oil back to original factory however supposedly the oil I am using is the exact same thing just a different color

 

My guess is torque dampening springs. I, two weeks ago, was doing my clutch and when I was putting the trans back together, pieces of broken springs had fallen out of the clutch cover assembly. Them springs hold the pressure plate for the clutches. If its that, a machinist is gonna have to cut the welds open on the assembly to get it open. There's another piece that could be broken in there but you won't know until its open. I sent mine to SSP to do. For them to replace the springs, bout $500 they said. If that other piece is broken, you have to buy a whole new assembly from mitsubishi for $1400.

 

lightening flywheel probably damaging the SST. SST is very sensitive and calibrated for a stock flywheel, not a lightened one. Sounds like the lightened flywheel doesn't generate enough centripetal force to engage the clutches. I'd get rid of that ASAP.

 

Please walk me through the need for centripetal force generated by the flywheel to engage the SST clutches. Note, also, that various vendors have sold very light flywheels for X MRs.