PJmak

Does anyone know if there is any way to disable this feature on our transmissions without doing a ridiculously expensive tune?

Im sure everyone notices it in our cars but its even easier to notice now that i did my engine swap. In a matter of days my tranny went from holding gears and revving high on its own to not having a clue what gear to be in.

I know i can reset it but I dont wanna drive my car hard or speed every day just so i could keep the tranny shifting fast.

I just had the trans serviced too and it all looked good. No shavings of any kind in the pan

KJI3jflarryfe93

did you do the ecu re-flash?
how is the performance with new engine and ecu tune, did you do a dyno job?
ARE YOU HAPPY?
is it a different car from before?

does she purrrrrrrrr more from exhaust?
how is the gasmileage on normal driving vs fun driving?

maybe your trans is worn and slipping gears?
driving the car like a frequent speed demon will learn the trans to stay in sport mode all the time

eFifty5AMG

+1

PJmak

Yes the stock ecu was reflashed. So far everything works flawlesly. No lights or issues with the motor.

I didnt do a dyno but performance is night and day. I am really happy with the results. I dont ever have to be above 3k rpm. The car just pulls. It gets up to 60 easilly so weaving through traffic and overtaking is done with little effort and no need to downshift.

the exhaust seems more quiet but maybe thats because theres no need to high rev the engine . At startup it sounds more immediate if you will.

Gas mileage seems better but again thats because theres no need to drive her hard. All it takes is an inch of throttle to be moving fast.

Tranny was just resealed and reserviced. No shavings was found and my mechanic is sure that its in good shape. It shifts fine when its reset but then it gets lazy. Its easy to notice. I know how to reset the tranny but i drive slow to work and back so it becomes lazy again very soon. I wanna permanently get rid of that featurw

Boost_or_die

I'm not sure if the ECU or TCU stores the keep alive memory for the shift strategy. Which ever one it is, I would assume that you could add a relay(switch side of relay) in series to the ground circuits of the module in order to remove/supply ground. The control side of the relay would need to be wired into the ignition switch (or something else that gets power with the key on). This way, every time you turn the ignition off, you remove the ground to the module and then supply ground with the key on.

PJmak

My friend that did my swap was talking about doing something that would reset the tranny every time you turn the key. Im gonna show him this. Im sure you guys are on the same page....thanks

Boost_or_die

In theory, this would work just like disconnecting the negative battery cable every time you turn the car off. I'm not sure if it would interfere with anything else in the car, but it has me interested enough to test this out. I'll have to check wiring diagrams to find out how the ECU and TCU are grounded and what else is grounded through those modules. You wouldn't want to reset the one-touch program for the windows every time you get in the car.

Boost_or_die

Definitely want to make sure it wouldn't disable the electric locks and alarm when you turn the keys off! I'm sure every one here knows how much of a b**** it is in these cars if your battery dies with your doors locked.

PJmak

Oh i wouldnt touch this my self. If theres an easier option i would but this id have to talk to him about

cm60k

It's good idea, but isn't some kind of risky, during of Electronics age..!?!

there are some sensitive components, MAF-TB adapt./alarm/security/central module that controls window & adjust. seat/EIS/OCP, elt...!!

ZAYED,,

PJmak

Yea it does seem risky. I was hoping there would be a much simpler option.

I have my battery disconnected now for 15 minutes. Im gonna have my tranny reset.

I know it can shift better than this. Right now when i give it gas it pulls but then all of a sudden the rpms drop and i have to give it more gas. Few days ago it was all nice and linear.

I was driving it under 3k rpm almost all the time so it probably decided to go into grandma mode because of that

cm60k

Disconnecting battery is good idea from while to while, as well as reset whole system via STAR/SDS,,

that's why i'm using lithium battery with switch ON/OFF instead of pulling cables..

ZAYED,,

Boost_or_die

It would be no more risky than disconnecting your battery. Disconnecting your battery for an extended amount of time resets, literally, everything. The risky part, like I said, would be if it disables the locks and alarm and get locked out of your car. The annoying part, but not hurting anything, is if you have to reset the one-touch operation for the windows or set up your radio every time. I'm going to be looking up the diagrams on Alldata and do some research on the possible affects of this, if I get time today at work.

PJmak

Disconnecting the battery disables esp and abs and resets the windows for sure. I dont k ow what else gets reset but i dont think id want my esp and abs off constantly.


Id be curious to see what you discover

cm60k

Good point,

ESP/BAS related to the angle of steering sensor, it's also part of acc. sensor aka lateral sensor,

Disconnecting the battery many times or at least ground may harm the whole circuit,,

*love your great idea "Boost", but as you know; we have 15-18 years old brides, should to take more care about half souls of these Electrics..

ZAYED,,

PJmak

Just drove the car a little and went through gears manually revving it up as high as possible.

Driving it(in D) already feels so much better. Id assume the trany is reset and has picked up on more agressive shifts. Lets see how long it lasts

cm60k

Do you try to adapt the TCU..?, it will helps to re-learn all shifts better...

ZAYED,,

PJmak

Not sure how to do this or what exactly you mean

Can you explain?

cm60k

Follow this PDF procedures..

adapt_ETC.pdf

ZAYED,,

Boost_or_die

I don't have enough time to do the research today and unfortunately I don't have access to alldata anywhere else other than the shop. I'll have to wait until monday. Hopefully it will look like it shouldn't be an issue. If so, I'll test it out and then do a write up.
After disconnecting the battery, the firmer and quicker shifts will normally last about a week for me.

mickey13

Did I read on a thread somewhere that you can also do a tcu flash? Related side question: how much tq is the c43 tran rated up to?

cm60k

Unfortunate; our TCU's can't be Re-Flushed..

ZAYED,,

PJmak

Ill look into this thanks

PJmak

Yea definetly doesnt last long.

Do keep us updated

mickey13

What about c43 with 5.5 and matched 55 tran. Still no hope?