I had an MRC module programmed by Jim Mero and even before I sent it in I felt no difference between tour and sport. Jim was kind enough to send me another MRC module with tour and track modes. I installed it yesterday and still feel no difference. I have the ability to read shock dampening rates on my HUD and the vertical position sensors they all read 0. 0% for the shock dampening and 0 volts for the position sensors. I checked the one MRC fuse I could find and it was good. My next step is the dealer but thought someone may have encountered an issue like I am having now. any ideas? Thanks - RB

 

Put a tech II on the car, go to BCM data, and see what mode the BCM is telling you its in.

If the selector **** is not working, or disconnected, the BCM data will state the system is in touring mode.
So by flipping the switch back and forth with the motor started (or in run mode/motor off), you want to see the BCM change from touring to sports mode.

Next, pull up the F55 module and do a data look at it next. The F55 module gets it command from the BCM on what mode it should be in, and it too should show a switch from touring to sport with the selector flipped.

If mode is not changing in the F55 module data, start by going into BCM set up with tech II/Tech2win, and make sure that real time dampening is selected in the RPO codes.
Skip to the part about using a Tech II

If real time dampening is selected, the next it to check the F55 module wiring from the BCM to the F55 module.
Hence may have been a problem in the F55 system, and instead of the old owner solving it, just went into BCM set up to just turn it off to stop the codes/why the system is not working. Or, could have have been a BCM replacement/ or firmware reflash, and someone did not go into the BCM set up RPO list afterwards to make sure everything on the car was correctly selected.

Hence on the C6, you can turn the F55 system off, while still leaving all the parts in play.

 

great info here, Thanks! One question, why did you delete the MRC option?

 

The later part of the video just shows how to go into BCM programming to turn F55/RTD off, while the first part of video shows pulling the MRC shocks to install non MRC shocks instead.

As for why one would remove the MRC shocks/ the F55 system, most of the times is due to at least one of the MRC shocks needing replacing, where your looking at $500 per shock. Other times, it's taking a base car up to at least a Z51 level suspension system or better for increased handling.

So the RTD system was a cross between a soft ride in tour (for a vet, which is still a rougher ride) and slightly firmer for sport driving, but was not on the same level as just a Z51 option car when it comes to handling.

 

Helpful post Dano523

 

FYI, have you even checked to make sure you do have MRC shocks still in play?
Could have been that the MRC shocks where removed/B8 shocks installed, F55 programmed out in the BCM, but selector **** and F55 module left in the car.

On the top of every shock, should be a electrical connector, and again, F55 module/RTD should be selected in the BCM programming RPO list.

 

good point, no i have not looked to see, it only has 13K on it and I am the 2nd owner so I just assumed that it had all the factory stuff on it.

 

What about the Z06 version of MRC? How does it compare to non MRC Z06's?

I don't track mine, just streets and twisties.

I have a 2010 base with MRC and Jim Mero's Super Sport reprogramming. The shocks are the same PN as on a Z06. I have it on good authority the springs on the base with MRC are the same as the springs on a 2012 Z06 with MRC. The bars are not, 25.5 mm front and 17.5 mm rear. I am changing the bars this week to a 33 mm ZR1 front and an adjustable (400 to 775 lb) MuscleBar on the rear. I have 265 front and 345 rear tires.

Didn't mean to hijack your thread.

 

MRC on the GS, the Z07 and the ZR1 is a complete different animal that the base models, since the rest of the suspension is set up for autocross/high spreed road course to begin with, and the just takes these suspensions to the next level with F55 in play.

On the base models, it was the other way, with base type suspension, and then MRC shocks add to it (why even the Z51 will out suspension handle than a base model with just MRC shocks).

As for wide body, verses narrow body, lot of difference in the amount of tire grip available, so F55 tune will need to be different between the two.
If Mero can come up with a tune for how you plan to run, Great, but would rather see an after market module/some other type of tuner with more end user type control that one could tweak the settings at needed to dial in the car from track to track isntead.

 

i've also had the Jim Mero update. but i had a hidden problem that took about 4 - 5 months to find. what felt like having no or minimals shocks, turned out to be both transaxle mounts were broken ( along with both leveling bolts also being broken ).
as soon as all of that was fixed, i had my MRC working properly again.

 

I am also having trouble with ride control on my ‘11 GS. Jim stopped by (DesMoines IA) in late Dec to do the update. I couldn’t test it out until spring. After a few days of driving in March I concluded there was no difference between **** position settings. I’ve been working with Jim (he’s been great) and I’ve tried different modules, but it seems to be ‘stuck’ in the sport setting. I say that because my current sport calibration is a ‘track’ calibration. The car is very stiff. If I switch to ‘tour’ there is no change. If I disconnect the switch, - no change. It’s still very stiff. I’m totally frustrated. Any suggestions or advice would be greatly appreciated. Everything else on the car works perfectly. I want my ride control back!

 

i also had the Jim Mero upgrade installed. while i do feel a difference between the tour & sport, i kind miss the stock sport ride. i was definitely firmer than the tour ( which i don't / didn't mind ).
with the current set up ( installed a year ago ), the sport still has too much play in it for me. but i when i really get on it, when driving club driving on the back roads, it firms up quite a bit.
i've surprised more than few fellow drivers with, how well the car handles. this also has surprised why others are surprised, it is a corvette, and a C6 one too.
i think people may think because of its width, it carries a bit more weight. obviously not so.
for now, i'll stay with the current set up ( Jim Mero ). i feel it may be geared more towards the people who want a smoother ride and, may not push it too much.

 

I am taking mine to the dealer next Monday ( Jun 21) to see what they can find with the F55 system., I will post more when I get the results, hopefully, it will help you some.

 

What issue are you having?

 

MRC not operational

 

Thx. I hope you get it sorted out. Anxious to hear what the tech has to say.

In my case, MRC was working properly before I stored the car for winter. Jim reprogrammed it in Dec. It wasn’t until getting the car out this spring that I noticed a problem.

 

update..... the GM tech had it for 2 days and could only scratch his head. in the BCM he can see the switch responding, and the f55 is selected. He can force the dampening on and it appears to be working when forced, but just no communication between the two modules. We agreed to try a new BCM but they were unable to locate one. So i took the car home for the meantime. i will give another update when they can find a new module. In case they cant find one is there a reputable supplier i can order one from?

 

new BCM did not fix the issue....

 

Crap. Thx for the update though. I’m taking mine to dealer tomorrow. If they figure it out I will let you know.

 

Have you been able to get it working? My dealer installed a new switch but that hasn’t fixed it.