Does anyone know where to find a guide or how to install the piggyback? I was hoping to get one but I cannot determine if this is a DIY project.

 

Use race chips directions as they are the same. They are on line

 

i am looking for the instructions as well. I just purchased a GT55 (actually just brought it home today) and the previous owner installed the RTM tune. He lost the instructions and he paid someone to install it so he has no idea how to do it. Just knows its behind the left headlight.

i need to learn how to uninstall for when I need to take to the dealer. Can some someone share the instructions PLEASE! Or provide a link?
Thank you!

 

Here you go!
This is what I got from Renntech when I asked them to send me a copy of the install instructions before I received my RTM so that I could have a good understanding. However the pictures are not that great. Also as we all know there are different iterations of the M177 motor. None of the pictures represent the M177 that is in the 55/63 line up. But the sensors that you will connect to are generally in the same place regardless of which M177 you have. So this will help you with the orientation of the connection points. NOTE: The CAM Position Sensor is a **** to access...depending which one you use. I use the upper CPS on the passenger side. Good luck.

 

thank you very much!!! I think I am going to need some help to get this done. I am not that handy or mechanically inclined. especially since its not exactly my engine. I'll look more into detail as see if I can figure it out. how does the bypass work? is the by pass a separate cable (I didnt get anything from the previous owner) or is that attached to the module already so it will be there once I gain access? sorry for so many questions this is day 2 with my first AMG so i have a steep learning curve.

 

The ByPass plug should have been provided to you as well.

 

ok going to see if he still have it somewhere. If not, I guess I need to call RT and see of they will sell me one?
what kind of shop might be able to help me uninstall?

thanks

 

This is great thanks. I asked them also to send ahead of time, as mine is on order, supposedly will have it next week. But they would not send out any details for install ahead of time. Not sure why.

I also inquired about their warranty program that will cover the car if MB warranty were to be voided by a dealer for the piggy back.

Here are the details for it for reference my car is a 2024 GT63, about 5K miles on it now :

 

My renntech RPM is supposed to arrive today, I will take a look and see if it's something I think I can easily do myself, or not. and will report back. I also got the blow off valve adapters, which apparently are quite easy to install. We'll know soon!

 

Renntech RPM got installed today by myself, not overly difficult at all. Probably the hardest part was finding somewhere to put the module itself.

It seemed to be pretty much the same process as the race chip.

I can see how it could possibly be more difficult on other cars with this motor, but there was only 4 sensors to deal with. 2 on each side. One on the charge cooler on each side, and one on the back top corner of the air box on each side. Pretty easily accessible, but I would say if they were buried more it could be a pain.

Pop the decorative motor cover off, and everything is kinda right there.

About the same amount of time it took for me to do race chip, however I also got pretty fast at taking the racechip in and out for service, so that could have partially been why it seemed easy to me. Because I did the race chip probably 10 times, in and out over the years.

If youve ever changed your oil, or a flat or anything like that it should be pretty simple.

 

thanks! I am going to take the cover tomorrow and report back to see if I can figure it out. It is hard for me since I’ve never seen the actual module or harness. Can you take a pic on where you place the module so I can see where to look for?

also, how do you plug the by pass module? The by pass module is just a little square you push into the module and that makes the car go stock? Or Does is have any additional wiring/harness?

Thanks for the help!!

 

well my harness looked identical to the one in the install manual that was posted. it only had 8 plugs. I'll try to take some photos tomorrow when it's light out. I only had 8 plugs, for 4 sensors, no 5th cam sensor. only 2x sensors on each side. So clarify with renntech, I have an email into them, because mine didnt have that but I plugged it all in and seems to be working well.

The by pass module is basically just a plug for the harness. There is a little lever on the large plug, open it and it can be pulled out of the RPM module. You then take the black plastic by pass and plug it into the harness in the same method you would plugging in the RPM unit, flip the lever back over to lock it in place. done. then remove the RPM module and set aside until youre ready to put it back in after service.

Here is a couple photos... hard to see, and again, this SHOULD be correct... the wiring harness is not the same as renntech mentions in the manual, and theyre not very clear on exactly what sensors, so I had to look for it and a little trial and error. But I got it all plugged in and it seems correct.

There is 2 small Torx screws to remove the air duct out of the way. This will allow you to see the sensor on the charge cooler. The other one on the airbox I had to look for a little but found it right on top outside corner/back of the airbox/filter housing. tried my best to circle them. but you just unplug the sensors, then plug in the matching renntech plug the male renntech side into the female AMG side, then the other renntech plug thats female into the male end of the AMG side.

There are 2 sensors on each side, 4 total. Renntech A & B on the harness to the associated sensors. to add a little more confusion the instructions say AB right, and AB left. However the actual renntech unit had an AB side, and a EF side. My guess to differentiate which side it goes to..

the more up close photo is a photo from the sensor on the back of the airbox. its easy to get to, nothing needs to be removed. its basically directly under the clip that holds the engine cover on.

when you remove the engine cover and then remove the air duct thing youll clearly see the one on the charge coolers also. the sensor looks like the one in the instructions.

The other photo shows the one on the charge cooler poking out from under the accordion looking air duct that should be removed to access the charge cooler sensor.

Notice the shiny black aluminum bit 09.177.0388 is the renntech blow off valve on the drivers side. :-)

As for the where I placed the RPM unit.... I temporarily set it kind of between the 2 air boxes, under the engine cover. I loosely zip tied it to a couple of points I could reach, but im not overly happy with it there, you can kind of see it peaking under the oil cap hole in the engine cover. again, not ideal, but it was getting dark out, so I temporarily set it there and seemed to be decently secure with a couple zip ties, just not pretty. It's the little red/silver looking box you can see in where the oil cap goes.

 

this is very helpful!! I will take a look tomorrow morning and see if I can identify everything and report back!! Thanks again for the pic! You have a Gt 55 or 63?

 

i've made several edits to my texts in that , because my gummy is starting to kick in 😂... anyway its a 63.

maybe the 55's are the ones with the "c" plug, I dont know.

Renntech is going to get back to me, because I asked them why the instructions made mention of a "c" plug for cam sensor, but my harness did not have a "c" wire or plug for anything. only 8 plugs for 4 sensors. plus the bypass/rpm module. my harness was identical to the one in the renntech manual, but does not match the text in the renntech manual. so was a little confusing. but I just assumed the C was maybe for a different model with the M177

 

I do have blow off valves as well ( i can hear them) but never new where those were installed!

so if one put the bypass plug and leaves all the wiring for sensors installed, the dealer will be ok with that? Doesn’t male too much sense.

 

thats what ive always thought...

which is why with my M5, I just took it out completely each time. Because racechip offers the same thing.

but the idea is you leave all the harness and sensors as is, leave it all connected to the car, and it wont be seen on a scanner or anything, but if they physically see a harness plugged into boost sensors or whatever sensors they are that are known to be part of the turbo system that gets modified with piggy backs, its no different than just leaving it fully in.

thats another reason I wanted to learn and see if I could do it, because I plan to remove the entire thing each time, not just the module itself, I likely will never use the by pass plug. unless I was maybe in a race or something where HP was limited to stock ? IDK, that would never really be a situation im in either, so I just pull it.

 

I was able to find it!! Your picture helped a lot! I just didnt know how it looked like or what to look for. I can confirm I have the C plug as well. So maybe its a 55 thing? I took a couple of pictures for you to consider the location. Its under the plastic cover on the passenger side. It was zip tight under neath a silver arm (not sure what is called). That tells you how much I know lol.

I took some pics and video for you. Can videos be uploaded here?

of not send a private message with your phone number. The video is too big to upload.

so, are you saying that the bypass plug its just a plastic cover with no functionality other than physical protection? Meaning, since I don’t have it, I can just unplug the RPM (purple) and that makes the car be stock again?

 

I have no c wire or plug. So maybe it is a 55 thing idk. But I only had 8 plugs for any sensors on the renntech harness. I’m sure my car has the same sensor , but the RT unit has no wires left unplugged, so for the 63 it may not utilize the cam sensor.

No, you need the by pass plug for sure. With out it none of those wires will complete their circuit. Basically the plug has the pins arranged in a way to essentially plug all the stock wires back into each other so it thinks the 2 plugs are just connected as normal. Removing it would stop communication from the sensors to the cars ecu. So you def need the by pass plug. For you to put back to stock with out the by pass plug you would need to reconnect the factory harness to the factory sensors.

also be aware that renntech recommends the car is 100% asleep before unplugging anything. Not due to damage but due to the car being awake and it losing communication with sensors and it could log that sensors lost communication and to will throw check engine lights and store codes for boost sensors or whatever disconnected. So make sure the car is fully asleep and the keys are distance away to not wake car up. This was the same recommendation for my m5 from racechip also.

 

Here is what renntech just sent me regarding the wiring being different than the install guide so now I need to go check and make sure I did it all correctly also.

it’s all plugged in and seems faster so I feel like I did it correct, but anything is possible I guess !

 

Just an fyi I may have plugged 2 of them in to the air intake box pressure sensor and not the right one. It’s running fine but now not sure if I did it correctly. And also not sure/confident renntech sent the correct diagram. So I’ll investigate later tonight.

 

interesting that you are seeing an increase in power then if you didnt plug into the right sensors... mmmm. I dont know what it should feel like since I have only driven the car with the module installed. I dont have a bypass plug so I guess I need one to make it stock and be able to feel the difference right? please confirm, the plug is not just a plastic peace but actually has connections that make the car go stock. if thats the case I need to call them to see if they will sell me a plug.

 

Well..... couple of possibilities could be happening....

1) its plugged in wrong, and maybe im not getting any power, it sure felt like it, but suppose could have just been placebo effect. Because I did think it could possibly get stronger, but I didnt test anything with timing gear or anything. And also didnt have a lot of time driving it so it's entirely possible im not. Or possibly it gave only a small increase, because I know for 2 of them are plugged in correctly.

2) it actually is installed correctly, and I am seeing the increase and the sensors are the correct ones, just maybe assumed they werent based on what renntech sent.

3) its actually is installed correctly and renntech has outdated information on where those sensors are located. Which is entirely possible also, considering it was labeled different, and missing an entire plug all together vs what the install manual says. So I suppose it's possible they just sent an incorrect diagram. not sure. but when I get home I'll figure it out.


The reason I am on the fence if I did it wrong or not is based simply on the fact that ive driven the car 3 times, and did a few race start pulls, and it is at least as fast as it was stock, and there is no check engine codes or issues, which I would have thought would have come on if it was that incorrectly installed. I suppose it's also possible that the sensors I plugged it into are the same type of sensor, just not the right one, because it plugged in just fine. Usually they will have a dedicated plug for these types of things to make sure you cant plug the harness into the wrong plug with a different shape connector or something. But it's all plugged in and operating fine.

It's entirely possible I did indeed plug into A pressure sensor, but not the correct pressure sensor.

And yes, there is electrical connection pins in the bypass plugs here is a photo of mine :

 

This is where I plugged them into, according to MB Parts guide, they are a pressure sensor. But im digging more to see if there is other ones that are the correct ones. But those are the 2 on the back side of the air filter box.

the other 2 I know are correct which are the ones on the charge coolers.

 

Another reason i'm not sure this is correct from renntech is because I can not find this diagram anywhere when I go on to MBparts website. Im not 100% sure he sent the correct diagram or if this is for an older GT, or something else completely. Its very confusing.

 

Keep digging.. you will figure it out. Thanks the picture of the plug. I will try to order a plug to see if the will sell it to me separately.
I am going to be away from home on a business travel but I will use your diagrams to triple check mine. although the previous owner had it installed at a performance shop but you never know. if I find something different I will definetely let you know.. keep me updated on your progress. I am sure there are other people going through the same so all that we are registering will be use sooner or later. last but not least. do you know if the module has different options for power? or its just plug and play and nothing can be modified/customized.