I’m trading in my 2024 GT55 so im selling my Renntech tune. The Renntech SKU is 54.177.RPM.55
its the M177 ECU Upgrade and increases the horsepower of the GT55 to 579HP and the torque to 664lbft.
This was $3200 new and I’m looking to get $1200 for it.

 

@Clemtigr1 I may be interested in it. Would I need to do anything to ensure the tune works with my car? VIN locked? etc? Thanks!

Fantom ~~>

 

oh that’s a really good question. They do ask for the VIN when you purchase it but my assumption was it was just to verify it worked with the car. I will email them and tell them I got a new one and wanted to make sure it will work.

 

Great, thank you. Let me know what you find out.

 

If this is the RT piggyback aka the external unit- you dont need to unlock your ecu as this is a boost modifier outside of the ECU (almost 100% certain its this).

Unlocking the ECU is not a well known process if done at all around here thus far on the GT cars.

 

yes, this is the external unit. There are 5 sensors that have to be bypassed and wired into the Renntech wiring harness…and it adjusts the boost of the car. Allegedly turning the GT55 into the GT63 engine as I believe everything else is the same.

 

I'm not really familiar with it. If it can be used without issue on my GT55, I'm very interested. Please let me know what they say about transferring/setup on a new vehicle.

 

they make them in both gt55 and gt63 configuration.

While they advertise the gt55 piggyback at 579 hp, it may be, but the gt63 is actually 625-630hp per renntech, and the renntech module brings the gt63 upto 725-750 I think. In my 63 it's a noticeable difference.

There is a video floating around showing a renntech 55 vs stock 63, and the 63 still pulls pretty hard from the tuned 55. so it's still a little short of a stock 63.

there is actually 4 sensors per my recent 63 install. renntech told me they do not use the cam sensor any more, at least not on the 63 model. But if this is an older version, they used to have 5 sensors.

You will (I think) have to speak to renntech about the VIN. They told me each unit was programmed per vin, not so say they couldnt change it on their end, but when I ordered it took them 1-2 weeks to ship out and one of the reasons was they told me they needed to program it to my car VIN. whether that means anything or not I dont know... could just before their internal system, but could also mean it wouldn't work of the unit recognizes a different VIN than it was programmed to. Tough to say, but call renntech they'll tell you im sure.

 

Update. I spoke to Renntech and the tunes are indeed VIN locked. They don’t reflash them or anything. I’m welcome to buy a new tune at a discount if I want to for my new car…how nice of them.

I had to remove the tune to trade the car in so now it’s a $3600 paperweight.

Needless to say I won’t be purchasing anything from them in the future.

 

wow, thats actually really stupid. racechip does a courtesy one time swap, but those units are also 1/4 the price.

I would almost now try to call RT's bluff... I wonder if it would work on another gt55 regardless what they say. that could potentially be a ploy to get people not to sell them.

Would be interesting to see what would happen trying to put it in another gt55 or sl 55. I wonder why or what reason they would have, other than to not allow it to be used on a new vin, to even bother programing it that way? The only other thing I could see is for their warranty purposes maybe?

But I wonder if those specific sensors are vin specific? Arent these are basically relaying modified real world data to the ecu via tricking the sensors? then the ecu adjusts the parameters of A/F ratio, boost, timing etc to produce more power. The piggy backs should realistically only trick those sensors into telling the ecu to adjust boost parameters etc. They aren't directly affecting the ECU programing so why would those sensors need a vin programed to it, ya know?

I say offer it to someone here that could be trustworthy to try it and see in a gt55, it's worth a try, it's a paper weight otherwise....

Maybe you and someone here who wants it makes a deal that they can try to see if it works on their car, if it does, they pay you for it at a pre-determined value. if it indeed does not work and is actually a paper weight then so be it. they can send back or dispose of it for you....

 

That’s a great idea actually. I would be willing to give it a try. They said they VIN lock them because they were seeing them on the black market, which I told them should be my option to sell because I purchased it…just like any other after market car accessory.

but to your point, maybe someone here knows more about how these work…but it only connects to 5 sensors as a piggy back, so is there even a possibility to be VIN locked?

 

I agree 100%, and it's a hardware item, not software. I wonder what legalities there are for that. I'm far from any legal expert but if renntech can basically guarantee that no one else can use the hardware, or you cant use on another car, whats to keep any other manufacturer of items from doing the same. for an extreme example... with Mercedes, whats to say they make it that no one can sell their vehicle after it being sold new to original owner? I would think if manufactures were allowed to get away with this, most would. But it's not allowed in that regard. I feel like there should be some terms or something that should disclose this. It may and probably is fully legal, but I would be interested to find out if they can legally lock it in to the original purchaser only. But I guess it wouldnt be original purchaser they would say "no it works on this vin for whoever owns that vin, its only vin locked". What if you got in a car accident and your gt55 was totaled, but the RT unit was fine, you replace your GT55 with a new one, and you cant use the RT module on the new car? Doesnt seem quite fair, or legal. But im no attorney. Im sure they did things legally when producing it.

With the sensors, etc. , I have no idea, i'm not nearly smart enough to know how they could vin lock it, but there probably is a way I'm sure, but maybe not. it would be fun to see if it actually isn't locked.

And come to think of it, with racechip, Im not sure if they lock it to a certain vin or not, but I know if you have a racechip it can be sent back and re-programmed, not sure if its just car model specific or vin specific.

Funny they say black market, like it's some underground hacking industry with a bunch of stolen renntech piggy backs, all to undercut renntech. LOL. It's a big conspiracy we're hoarding the old RPM units to hack them to stick it to renntech. LOL.

Pretty sure they just **** more people off with this, instead of making it a profit center.... why not charge a fee to re-program it to a new vin then? In your scenario they could make a little $$, but instead now you just throw it in the garbage, with the hopes that whoever would have bought from you will just pony up the funds to buy new. Its silly. Its Not like a single RPM could be used in every single car I ever own from now until I die. It would only work on a GT55, but should be able to use it on different GT55's. Dumb Dumb Dumb.

 

I quickly read thru the last few posts--- I would also call BS on RT. The piggy is an external mod and doesnt chat with the ECU. They are mad you are selling it vs their chance to retail one at 3800 bucks

 

Clemtigr1,

That is ridiculous. I'm still open to buying if it can be swapped to my VIN/car.

 

find out how much of a discount RT will offer for clemtig1 to buy another one. maybe he can buy one at a discount with your vin #, and he can recoup some money, and you can save some money from new. Could be worth it if they give a big enough discount on a new one. Never know! LOL. leaves a sour taste in my mouth with RT though tbh. for this kind of money they should at least offer ability to swap to 1 new vin or something. IDK. Good to know though when im done with mine on my 63.

 

Anyone here happen to be located in Central Florida? Id def be willing to let someone install it and see if it works.

 

it should work on an SL 55 also. It’s the same sku # from RT. At least it is for the gt63/sl63

 

Clemtigr1, I'm in south Florida, 40 mins North of Miami. You? What tools are necessary for install?

 

somewhere in the forum is instructions for install document. In a diff thread.

Relatively easy not much tools needed, only a couple screws to remove intake piping if I recall correctly. And any tools you may need depending how you plan to attach the unit to the car. But it's only unplugging some sensors, and reconnecting.

The hardest part is getting to a couple of the sensors, at least that was the case with my gt63.

 

no tools required.. the only issue is trying to get to some of the connections (requires small hands) easier to get to from underneath the car if you have access to a lift.

here are the instructions
https://mbworld.org/forums/attachmen...ning-unit.docx

 

I just had this done. Went from one GT 55 to another GT 55 different years and it works. No errors, no codes. Everything is running smoothly. Seems like a little more pickup and better shifting from my first ride with it.

 

Well there we have it--- thanks for this

 

Not sure to be excited about this, or irritated that RT is full of ****. LOL...

Hopefully they didn't start vin locking more recently and only earlier ones would be able to be swapped from car to car.

 

I swear they are full of **** saying they can vin lock an external boost enhancer... I just dont see how this non ecu related item can be mated to an ecu/vin.

 

Does this tune or any other piggyback get rid of the soft rev limiter?