Jae Duk

This is the very first time I touched the engine. I know RPI (Race Precision) is more well known with the BMW crowd. My friend went to get an exhaust, scoops and an ECU tune. Eloy saw my car and said he had a tune for the car that he wanted to test out and he'll give me a bit of a discount as an intro price, and that he had a 30 day money back guarantee in case I was not happy with the tune so I figured why not.
Did a baseline dyno and then followed by a 20 min tune (maybe less) and followed by another dyno run. Overall I was in there for about an hour. This is my first review so I'll try to make it good like Superlubricity

Car
C63, ~20,000 miles, 91 Octane gas

Conditions
It was a week ago don't really remember. About 70 degrees. I was there from 10-11am.

Dyno used
Dyno Dynamics

Both before and after were recorded on 4th gear

Stock dyno run
Horsepower ~ 322.7
Torque ~ 306

RPI Tune Dyno Run
Horsepower 384.1
Torque ~335

Increase
Horsepower ~61.4
Torque ~ 29

Final Thoughts
I thought my stock numbers were low. But those were the numbers we got. I then remembered that different dynos will yield different results. Modding engine is all new to me as this is the first car for me to actually put on the dyno. Dunno if it'll make a difference but I do have 20" wheels on; my friend told me that will decrease the numbers a little as well. Nonetheless the numbers are there with the gain. The experience was good. Eloy was very helpful and explained everything step by step with me. I stood by him when he did the dyno runs with different gears and there were no cool down period in between.

And of course the dyno sheet:

alqamzi

Dyno dynamics is known to be heartbreaker and reads accurate. nice gains

C63newdude

So how much are the nowdays charging for a tune(RPI that is)? Awesome gains by the way..

bhamg

Regardless of the starting number (which I wouldn't worry about), that is a great gain! I personally like the DD...of the 60+ total pulls I've done on dynos in different cars, all but six have been on the DD. Hope your summer is going well JD!

Jae Duk

$1495...same price as Kleeman more or less. But if you're in LA and you have time it'll be a 1 day turn around...I was actually only there for 1 hr.


Thanks. Summer is stressful. Need to find a JOB!!! I'm running out of money to put gas in my tank

930chas

60+whp from a tune! Very nice gain!

chief63

I thought they would price a bit under Kleemann, they would sell 10 tunes at 1000$ for 1 tune at 1500$. The 1500$ price mark is crowded by the competition...

JonMBZ

Agreed I would not buy it from them at that price since they really have no credibility yet. I am surprised you also paid for them to make your car a lab rat. You are doing them a favor and software is virtually free.

Jae Duk

Well that's what I thought at first. But my friend brought me to RPI (owns a 335). And I talked to Eloy and he seemed like the guy that won't sell you something that he doesn't expect any gains out of. When I got home I did a little digging and it turns out that there have been many positive reviews about him. He's been in the industry for about 11 years so I was sold on it.

2K6E55

Nice gain P, congrats on the new beast.

chief63

I think what we meant is that charging similar prices than kleemann for similar gains (maybe a little bit better) is a bit much. They should price around 1000-1200 and would sell much more. They remain an uknown brand when it comes to C63 tunes...

Let us know how it goes!

FlyC63

I asked them about the pricing and they said the forum member pricing is $995. IMHO, there is no comparison. I had RPi products on my M5 and credibility is not an issue with them. They are one of the few honest companies out there.

RStevens63

I wonder who RPI is working with for MB tuning? Didn't PowerChip Group do their BMW tuning?Jae any idea?TIA
Otherwise 60rwhp/29rwtq from a 91 octane tune doesn't sound realistic at all. Some DD's are heartbreakers, others read like dyno jets sometimes higher.

FlyC63

This new tune is done with ESS. From what I know, RPi ONLY works with ESS now.

RStevens63

Thank you!Jae, I would still hit another dyno (DJ not owned by the tuner) to see real numbers.

Boost Gomez

They should tell ESS to work on a supercharger kit for the 63.

FlyC63

Have you ever dynoed or know of someone who dynoed with RPi? lol. Their low numbers tend to rape others who dyno much higher elsewhere. I know this from experience.

RStevens63

A few big name tuners have tried to put superchargers or turbos on a 63. The concensus is that unless you run standalone engine management, unfortunately it's not going to happen.

RStevens63

Did it hurt? On a more serious note, I don't care what their dyno says, +60rwhp/29rwtq from an accurate Dyno Jet on 91 octane isn't going to happen with just a tune on a C63, let alone on a properly calibrated DD. +45rw is a large gain for 91 octane in fact. If they don't do their own tuning in the first place, well they technically aren't raping anyone, ESS would be. I've never seen dyno #s rape other dyno #s before, are they an aggressive breed? I guess when I see someone run something worth noting at the track it may change my opinion. So far I see MKB, MPH, Renntech, and one Kleeman car going 11.99 (the rest are in the mid to low 11s) leading the way. Out of 26 slots, none are ESS. http://www.dragtimes.com/Mercedes-Benz--C63-AMG-Drag-Racing.htmlDoesn't matter whose tune it is, I don't think I'd take the time to dyno at the same shop I got the tune from, but that's just me.

Jae Duk

Agreed!! I've seen the youtube videos.

RSteven if you don't believe me about my gain you can get the tune and test it out yourself. If you're not satisfied Eloy will return your money and relfash your ECU back to stock. All I'm saying is I can feel the power gain, and the numbers are there, and exhaust note is a little bit louder on cold start.

RStevens63

Sorry if I inferred that I didn't believe you, that's not what I meant at all. In fact thank you for posting your experience. I'm just saying that no matter what tune or product you buy, you're better off personally, by dynoing at another facility. The 60rwhp gain on a dyno that based on the baseline pulls definitely reads on the low end of the spectrum means that on a DJ you would be at an easy 80-90rwhp gained on 91 octane, that my friend is impossible. In the end all that matters is your happyness, so please enjoy, and again sorry if I wasn't clear up front. I'll sit back and watch other results from this tuner as they come in with interest.

MB_Forever

I've actually dynoed my car at RPI and I can attest to how low their dyno reads. However, they can change the settings for you by adding a correction factor to match dynojet numbers. I believe Eloy likes to add only 10% but I've seen other dyno dynamics operators adding 11% and sometimes even 12%.

I can't remember the exact numbers, but here is what my car (E63) did on that same dyno (100% stock down to the charcoal filter):

387 whp (no corrections what so ever)
432 whp (same run corrected to 10% I believe)

FlyC63

I asked Eloy about this and he said people might question it so thats why he dynoed it in "shootout mode". There is no way you can change correction factor as the feature is locked out of the dyno sofware when its in that mode.

RStevens63

This is a good read about DD dyno's and how easy it is to manipulate results with them:http://www.m3post.com/forums/showthread.php?t=305673

Jae Duk

Fly just said Eloy dynoed on "shootout mode". It's even says it on the bottom of the dyno. Anyways there will always be non believers...I bet if evosport claimed theres to be a 80hp gain you'd believe it.