Thread: Article: RENNtech M278 twin turbo 4.6 liter V8 ECU tune upgrade - +70 horsepower, 530 crank horsepower for C218 CLS550
02-01-2012, 01:33 PM #26
02-01-2012, 02:02 PM #27
02-11-2012, 05:17 PM #28
02-11-2012, 08:04 PM #29
02-17-2012, 08:39 AM #30
02-17-2012, 03:19 PM #31
I'm confused: MBZ rates the CLS550 at the same hp (402) as an E550C, but the S and CL are rated at approx 20hp more (429).
Some tuners have implied that the M278 is the same in S,CL,CLS,E with possible exhaust differences.
Regardless, thanks for the update. Looking forward to your updates.
Last edited by Dueclaws; 02-17-2012 at 03:25 PM.
03-13-2012, 10:36 AM #32
Congrats to RENNtech on their latest improvement to the M157 engine! Impressive platform with amazing upgrades.
Will there be any other upgrades to the M278 RENNtech tune?
03-13-2012, 05:39 PM #33
03-21-2012, 05:26 PM #34
This was posted on another site today. Can anyone from RENNtech verify what is shown here? Thanks
"Renntech Tune For Cls550
Just spoke to george at renntech and got some results for the Renntech ecu tune. A customer ran a s550 biturbo with the tune and without.
1/4 mile Bone stock 12.89
1/4 with tune 11.73.
With the Cls being lighter by a couple hundred pounds we should be looking at the same or better results. That is crazy we would be looking at a 0-60 time in the high 3 seconds! Just a little slower than the amg."
03-21-2012, 07:16 PM #35
03-22-2012, 09:10 AM #36
03-22-2012, 02:09 PM #37Member
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Well that's crazy, the heavier tuned S550 is only 4/10ths slower than the tuned CLS63 (11.3s, reported by multiple tuners)? Whoa.
03-22-2012, 04:45 PM #38
03-29-2012, 11:03 AM #39
04-04-2012, 07:41 PM #40
Haven't had any answers to my recent request on this site, but have a good report from another site regarding the RENNtech ECU tune on a '12 E550C.
"Just got my ECU back from Renntech, dramatic difference. Had the dealership handle everything, charged me 1 hour labor. Figured it was cheap insurance, gets me out of the loop should any issues come up. Great service, great results. Dealer assured me there were no waranty related issues tied to the upgrade. Actually pretty comfortable with this and everyone's approach. Geez, glad I went to fat 19" tires. In sport mode the car will really get your attention. The change in "tip in" is pretty obvious."
04-05-2012, 03:34 AM #41
04-05-2012, 03:34 AM #42
04-05-2012, 09:30 AM #43
04-05-2012, 08:01 PM #44
By the way, the guy who installed the RENNtech tune (post #40 above) got interested in the tune after I posted the RT press release at another site. I learned about it on this site: so chalk one sale from Benzboost (and me).
04-05-2012, 09:24 PM #45
04-07-2012, 05:25 PM #46
Before I choose a tuner for my CLS550 4Matic, I'd like to be educated as best as possible. I wish there was more info/feedback from RENNtech within this thread... as well as current uses with the M278 tune. I've tried calling and emailing RENNtech directly, but they seem elusive and/or unwilling to answer some simple questions. Since I don't race, I'm only interested in everyday street characteristics. Is it too much to ask, "What should I expect with my purchase?"
Sticky- Perhaps you can find out the following:
a) Is the street drive-ability compromised in any way?
b) What about the slight turbo lag I often experience at light throttle... can that be eliminated?
c) Are the transmission shift points altered in either the economy or sport mode?
d) Is the speed governor eliminated (not that I will ever test that feature)?
e) How is the fuel economy impacted?
f) Have free flow air cleaners been tested with this tune... do they recommend them?
g) Why do they list all the M278 engines with the same power when the factory rated them differently?
h) Are more tune updates in the works... what about vehicle accessories?
Anything else they could mention for features would be appreciated... I'm just trying to learn exactly what to expect.
04-08-2012, 12:25 PM #47
Here's the response to some of your questions from the owner of the '12 E550C with the RENNtech tune.
The others would be RENNtech's to answer.
a) The most noticable change was the throttle tip in, seems more immediate and almost exaggerated in sport mode in normal mode it as you might expect. But to answer directly the change, to this point hasn't negatively impacted day to day driving. Except to say maybe a bit more fun.
b) As to turbo lag, it's probablly as responsive as possible and still have a turbo. I am suspect of someone that tells me they have a performance turbo and has "no" lag. Lag is part and parcel to the turbo.
c) I don't believe the shift points have been altered, could be wrong but don't think so.
d) Also believe the speed governor/rev-limiter are still intact, as they would tie directly to warante implications.
e) As many have stated, the mileage might be a bit better but dip into the throttle a bit more so it's probablly a wash. But certainly no losses.
04-08-2012, 11:38 PM #48
04-09-2012, 10:18 AM #49
04-09-2012, 08:54 PM #50
a. no, it should be better with increased torque.
b. that is likely a function of having a turbocharged motor but throttle response can be changed.
c. don't think so
e. heavier foot, it will go down.
f. freer flowing filter will only help.
g. just likely to save time and a small oversight.
h. yes, more tune updates in the works and accessories.