So I ended up pulling the trigger, it was on sale for 3400 down from 3850.00 so I ended up just ordering the Renntech RPM module (piggy back) , even though I know im definitely NOT the only guinea pig for the Renntech RPM, the lack of information, reviews, or details around it make me feel like I may be the only one thats actually installed it on a GT63. I will actually review it and provide the forum the details when I have it in hand and installed. Ive tried to get information from owners that have mentioned they have the RPM, but thats been a waste of time to be honest.

I also ordered the blow off valve adapters, just for fun. Which, may or may not stay on the car depending how obnoxious they are. We'll see. LOL. Seemed like a fun thing for 300.00 and if it's lame, or annoying, they'll be removed quickly.

According to renntech, this will bring the GT63 from 577 hp (625 actual) up to 725 actual, so its a substantial gain, if it's accurate.

On my F90 M5, I believe the Racechip piggy back added 60-70 HP, and it was definitely noticeable, hoping this will be at least as big of a gain/change to the GT63.

Stay tuned.... (see what I did there... tuned)

 

Sounds good!!!

Too bad you didnt also have an RC to compare?

I just could not beat the gains for the price on RC but if you are seeing that much more; Ill be happy to try it.

While my RC is definitely noticeable; I know its not 725 crank for sure.

 

I suppose I could buy a RC also. Or I wonder if the RC I have for my M5 could have software re-done or updated for the GT if they could change the wiring harness? but I agree the racechip (at least for my M5) was a great upgrade for minimal money.

I know racechip used be able to provide an update to a new vehicle if you changed cars, but I would assume need to at least stick with the same brand of car.

I would say 725 vs 625 should be a noticeable difference, but never know with some companies hyperbole.

Maybe you send me your RC and I'll send you the RT to try out and we decide once and for all LOL!

 

LOL

I had the RC on my F90 M5 and 2 M8's which all have same engine as you know; that S63tu sure loves mods and probably moreso than our M177 cars.

Ill bet your RT will be > than the RC but the question is how much.

 

I am picking up a used GT55 on Thursday that I just bought and has the blow off valves, RMP module and exhaust tuned all from Renntech. I have never owned a AMG so I am excited!!
I’ll follow you and perhaps we can exchange notes.

are you installing everything yourself?

 

Im not sure yet if I'll be installing the RPM. The blow off valves look very easy to install, so I can likely do that myself.

I installed the racechip on my M5 and it wasnt difficult at all. But from what Vic has mentioned the GT63 is a little more involved so I'll wait to receive it and review the instructions before I decide to install myself or not.

Nicely done on the GT55, this was my first AMG car. I came from an F90 M5 Comp. But I do also own a G63 AMG, but thats not quite the same, but technically that was my "first" experience with AMG.

 

You may be in for a bit of a wait. I ordered the RPM and valve controller on black Friday and I am still waiting on delivery. When I called a week or two ago they said it was being held up in customs.

 

I am not super mechanical nor not mechanical LOL- the S63tu was an easy install but the G80 M3 CS I have takes more work and the AMG is harder than both. The GT63 has even more sensors to plug in and they are all over the damn place so I just paid my guy while he also lowered it. Its definitely still a DIY install if you want though.

The RT Valve controller was easy as long as you have a rack or some sort of elevating unit. (oh I used that word )

 

hmm, interesting, it said "in-stock" on their website. Sure hope that it actually is in stock and they arent playing games.

I'll definitely cancel the order if they dont ship it out for several weeks. That'll be a big problem for me.

Hopefully for my sake (sorry) the one for the 63 is readily available.

 

The install is pretty simple. You are tapping into 5 sensors, 4 boost sensors and 1 cam position sensor. I mentioned on here a few weeks back that I had seen the rc and rt on the dyno together. The rt unit definitely produced significantly more power than the rc.. unfortunately for guys with 2025s the rc is out as it won't work

 

Yes, I recall you mentioning that, and appreciate the info on install.

 

Got the RPM unit installed as well as the blow off valves.

The blow off valves are completely unnecessary but kinda fun to listen to when driving, not obnoxious, but can definitely hear them.

3 bolts on each. the bottom one kind of a pain to get to, but can pretty easily pop the air filter housing up to get a little easier access to it.

The RPM was pretty easy to install as well, I found it about the same difficulty as the racechip on my M5. with the biggest hurdle trying to figure out where to put the thing. But I also installed and removed my racechip many times for service. So that could have made it seem simpler to me than it could for others. but wasnt overly difficult. 2 sensors on each side.

Now for the good part....

It's definitely noticeable, oddly, it's more noticeable to me in comfort mode down low. But it definitely wakes it up on the top end. I would say it's as much of a punch as the racechip added to my f90 m5. I havent really put it through the paces yet, and if anyone else can chime in on the following...

With the racechip when I first installed, I felt like initially it wasnt as noticeable as it was after driving for a week or 2 maybe. I assumed that was due to the ECU kind of adapting its parameters and mapping accordingly.

So im not sure if this car will be the same, but I will say it's definitely noticeable with the butt dyne. Still on the fence whether or not its worth the up charge over the race chip, but I'll give it some time to make that determination.

Once ive had it a few weeks I'll put the bypass plug in it, put back to stock, drive and see if I can feel that difference, then put back in again. I'll do some pulls also and try to time them.

its certainly noticeable, and definitely provides some stronger pull up top, which is where I felt it needed the help. My M5 had so much top end that it felt faster at highway speeds, but now this feels very similar to that in how it pulls from 70mph +

If youve ever installed anything on a car, or done even basic maintenance, I would say both the RPM as well as the blow off valves would be an easy install for you.

Cheers, feel free to ask any questions, although ive only had it for an hour or so LOL.

 

I only had 4 sensors it got tapped into.

2x on each side. 1x on each charge cooler, and 1x on each air intake box. Hopefully I didn't miss anything LOL, but I dont believe there was any other plugs I missed ?!

 

Strange...please check again. I had 5 inputs for mine. The 5th being any one of the 4 Cam Position Sensors. Maybe they took that out...?

 

There was a total of 8 plugs on the Renntech harness unit (not including the large plug for the RPM module itself). the 8 plugs plug into 4 sensors on the car.

2 female ends on each side of the car, and 2 male ends on each side of the car. basically disconnect the car wiring harness from its associated sensor. then plug the renntech harness into each open end you have now.

Mine looks just like the photo in the manual you posted. 8 plugs, plus the bypass plug/module.

I definitely would have noticed a random plug/wire hanging with no where to plug into. I know the instructions talk about plug "C" for cam position, but mine didnt have that at all. No C plug.

I did email renntech to confirm. But I drove the car, no lights, everything seems to be operating properly.

 

Please let us know what their response is to this please. Do you have this same SKU number below?

Mercedes-AMG GT 63 (C192) | RPM ECU-Upgrade | 4.0 L BiTurbo | up to 725 HP | 765 LB-FT | +100 HP +84 LB FT

RENNtech Power Module ECU-Upgrade for Mercedes-AMG GT 63 (C192) | 4.0 L BiTurbo w/ EQ Boost | M177 | 725 HP & 765 LB-FT
SKU: 54.177.RPM.63

 

Yes thats the one. To clarify it says SL63 R232 at the bottom because their website didnt show it for the GT63, but before they sent out I sent VIN etc and they clarified its identical for sl63 and gt63 , same sku, same specs.

 

This is what renntech just sent me. And now I need to go back to verify I did it correctly. I would think if I didn’t do it right I would know by now. But maybe not.

 

ok @Vic55 ive got it PROPERLY installed now... and I can report.... its absolutely noticeable.

I had 2 of the sensors on right, 2 incorrect, it didnt throw a CEL, and it actually did feel faster then, but now? its a big difference. Maybe was placebo, or maybe it was just running well lol, idk. def not placebo now.

much more noticeable than the racechip on my M5, at least to me it feels stronger. I would say this would probably beat my M5 now. Compared to your race chip in the GT, not sure, but I can tell you it's a big difference over stock.

 

Thats awesome and of course I cant measure much with my RC but Im assuming based on RT's claims that you do have more power than the RC.

I did turn off my map to 0 today (was 7) and put in the bypass plug; clearly there is a difference from a dig and thru the mids up to around 140 mph. The car is still fast but its not the same as the RC- I think Im good with the RC and the monies spent but Im sure you have a more few ponies and tq with that RPM.
Oh another thing I did which kind of creates effective hp is added the RaceChip XLR which accentuates the throttle. Tip in is much more like our M cars in Sport Plus and its just a faster responding action to my foot input. You might like that and its super easy to install (10 min) and only a few hundred bucks.

 

ill look into it, I agree I dont love the throttle response it feels little odd compared to BMW, sometimes it feels like its either all or nothing, id like some more ability to feather the throttle with out letting off completely, or vice versa, that I can get 75% power with 75% pedal input, where stock it feels like goes from 10% to 100% throttle floored, and not much in between. is that what youre referring to?

 

Pretty much spot on ... its so damn non responsive and then baaaaaaam you are dead

 

What throttle map do you use?

 

with the Renntech RPM unit, there no selectable maps to my knowledge. Racechip does have 6-7 maps ( I think).

 

its like a damn Yamaha banshee 2 stroke old quad/atv death traps if you didn't know what you're doing.... nothing nothing nothing, wheelie, dead, and banshee screaming down the trail with no one on it.

Does the XLR, when installed, eliminate, or affect any of sport, sport+, comfort etc when you change the modes on the car itself?