Hey,

Has anyone before successfully fitted and has a working 7g-tronic on the m113k engine? Thanks

 

The massive torque low and mid range torque of the 113k doesn't benefit from short ratio gears of the 7g, people here have swapped to shorter ratio rear end only to swap back to the stock gears due to lack of traction. You'll make the car slower, less reliable, more complicated and at the end of the day you're paying a lot of money for a downgrade. Thats why people here haven't been doing this kind of swap.

 

Thanks for the quick answer. I understand what you are saying but what I am really interested in is from ECU/TCU point of view was it done and how so.

 

I have a slightly modified 7g tranny, 3k stall, lsd, 3.06 pinion, with a chasis that already had 7g preinstalled meaning with all the wiring/harness so the only problematic part for me would be the ECU.

 

Honestly you would be better off at this point to bag the E55 and buy an E500. You would be spending heaps of money on something that will change little or nothing when you could get that transmission in an E500 with a regular M113 for less money.

 

I do not care about money. If I wanted to sell the transmission I would have traded it for the whole car. E500 that is.

From now on please reply only if you did some similar coding as I am not interested in buying/selling. Thanks

 

So basically if you wanted to try to do this it would be easier to code a m113k ecu to a car with a 722.9. I do not know if you can code a 722.9 to a car that did not come with it. I have never looked but most likely the EIS coding is different since the Hash for starting is provided for the trans as well. I know this to be true on other cars that have multiple components that use the key information like Shifters in the w220, w215, R230. And ISM modules. Good luck

 

I am not aware of it being done before. You could look at using a stand alone ECU and maybe separate some of the communication to hybrid fit the 7g.

 

Standalone is my B plan, yes. But I am trying to figure out if there is an easy way meaning if can be done using a stock mb firmware, I was thinking of going CLK55 AMG fw which basically has a 5.5 m113 engine with no supercharger but had a 7g on it. The only problem here that I see would be enabling the supercharger communication via ECU as I do not want to go without a clutch or doing a separate module to have the sc enabled via watching the rpm and the throttle sensor.

 

maybe if anyone coded the ECU for a naturally aspired engine and put a lysholm supercharger on it, but why would they do that as they could flash with an image that already has it enabled....

 

It has been done in Dubai. The idea that the E55 would not benefit due to the massive low-end torque is very short-sighted. The drive-ability, fun factor, and overall responsiveness would increase tremendously.

Instead of constantly pushing for more power out of this platform, we should as a community figure out an effective way to swap to a more modern transmission. Perhaps even to the ZF 8-speed.

 

I agree, I do not believe it will be worse. Any idea who did it in Dubai so I can reach out?

 

You can work the supercharger with a vacuum/pressure switch on the intake manifold and use that to trigger the clutch and pump.

 

Sending you a PM.

 

Some things CAN be done but SHOULDN'T be done. This is one of those things.

 

Why should it not be done?

 

Let me see...

1) The cost of this swap if done by a reputable shop would quickly exceed the value of an average E55 and completely tank the value of a really nice low mileage E55
2) A stock 722.6 is rated for over 1000nm (737lb-ft), stock 722.9 is rated for 760nm (560lb-ft) of continuous operation. A stock E55 makes roughly that much, I doubt anybody considering swapping in the 7g is going to keep the engine stock.
3) The m113k is all about torque which begins to sharply drop off at 5000rpm, the 5g with it's wide ratios takes advantage of that. A 7g shifting at redline would only drop to 5000-5500 rpm between shifts and keep the engine out of it's torque band.

By the time you swap in the transmission and finish dealing with the electronics you could have bought an E63 to park along side your E55. Instead you're going to be left with a hacked up E55 with a transmission that can barely hold the stock power and uncertain drivability.

@psotnic is in a unique situation where he has a built 722.9 and a car already wired for it and deep pockets, all he needs is programming. I'm curious how it performs and would love to see a video.

 

This is true I am in a unique situtation where everything kind of came to place without me spending any additional money to be able to play around and do the swap.
Fantomas has a point if anyone wanted to go this way from scratch it would involve a lot of money so it would not make sense for all your perfectly working cars with stock 5g.

That being said...

I am putting the engine and transmission in this week so fingers crossed some programming this weekend to see where we are. Will definitely let you know how it performs better or worse so far just hopping to shift gears.
Definetly hoping the 722.9 will blow up as I have an ongoing bet that it will hold. And yes nothing on the car or the engine is stock.

 

I'd pay a lot of money to have a better shifting/driving transmission. More so if it rev-matched on down shifts. The 722.6 is an old bag. I like the car, hate the trans.

 

Nothing wrong with the transmission, just the electronics.

 

Ok, just to keep you guys updated the transmission works fine its still in learning mode and have not driven it more than a few miles yet to give a proper feedback as to the performance as I am still testing for any possible leaks with the engine being build from the ground up. No major coding issues which I expected at start as you can obviously pair whichever transmission either 5g which is used in all 5.5 amg, 7g used in 500 and 5.5 slk or sequential transmission which I believe was used in DTM cars. No changes to the engine or transmission to couple together either.

 

I agree, I see zero benefit from doing it.

 

7 speeds is better than 5

I had a V10 M6 that made no torque but you don't need it when there’s always a gear where you’re going vroom vroom

 

The m113k has plenty of torque. Until I see at the track IMO It won't do any good. This platform runs 2.65s in the rear. It screams through the traps at the top of 3rd and a converter hasn't proved it's self either. So to add a few for speeds probably won't change your ET much if at all. Just because it works on most cars does not mean it works on every car.

 

Apply the same logic to swapping a 5-speed trans with slow shifts and wide splits (AKA 722.6) to either the V or Hellcat. Zero change in performance?