RENNtech M278 twin turbo 4.6 liter V8 ECU tune upgrade - +70 horsepower, 530 crank ho
Thread Starter
Super Member
Joined: Nov 2007
Posts: 574
Likes: 7
From: Hawaii, (Texas:business)
'12 E550C, Sierra Denali
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 warante related issues tied to the upgrade. Actually prretty 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.
Thanks
Due
Member
Joined: Jan 2010
Posts: 201
Likes: 1
From: Buffalo, NY USA
2012 E550 Cab
Have no idea, not a drag racer. Been road racing since I was a kid, mostly Corvettes and Porsches, which is more than a few years ago. Don't get me wrong, I do appreciate the straight line speed, just enjoy driving the car around town and like the idea it'll go like stink if the need should arise. But without over analyzing the change, I do feel it was a worth while investment. I'm happy with the performance gain and have had zero problems. Maybe not for everyone but as I said, I like it.
Thread Starter
Super Member
Joined: Nov 2007
Posts: 574
Likes: 7
From: Hawaii, (Texas:business)
'12 E550C, Sierra Denali
Ray-
I'm not a drag racer either; my racing was with boats for many years and all my racing is history now, but have my big offshore cat with 1,800 hp for "fun" (very expensive fun....).
The 0-60 is just a comparison-reference for me.
Thanks for the information about the tune; I'm more anxious than ever to get it done.
John
I'm not a drag racer either; my racing was with boats for many years and all my racing is history now, but have my big offshore cat with 1,800 hp for "fun" (very expensive fun....).
The 0-60 is just a comparison-reference for me.
Thanks for the information about the tune; I'm more anxious than ever to get it done.
John
Member
Joined: Jan 2010
Posts: 201
Likes: 1
From: Buffalo, NY USA
2012 E550 Cab
John,
Like boats as well, most of my big water experience was on my uncles converted plywood WWII PT boat. Did some sport fishing out of Cape May NJ. Always had an attraction to cats, these guys are very sea worthy but I guess I don't have to tell you that.
Like boats as well, most of my big water experience was on my uncles converted plywood WWII PT boat. Did some sport fishing out of Cape May NJ. Always had an attraction to cats, these guys are very sea worthy but I guess I don't have to tell you that.
Thread Starter
Super Member
Joined: Nov 2007
Posts: 574
Likes: 7
From: Hawaii, (Texas:business)
'12 E550C, Sierra Denali
Ray-
Another MBZ owner asked these questions about the RENNtech tune: can you give your opinion, please?
a) Is the street drive-ability compromised in any way?
b) What about the slight turbo lag I often experience at light throttle... can (is) that be eliminated?
c) Are the transmission shift points altered in either the economy or sport mode?
d) Is the speed governor eliminated?
e) How is the fuel economy impacted?
Thanks!
Another MBZ owner asked these questions about the RENNtech tune: can you give your opinion, please?
a) Is the street drive-ability compromised in any way?
b) What about the slight turbo lag I often experience at light throttle... can (is) that be eliminated?
c) Are the transmission shift points altered in either the economy or sport mode?
d) Is the speed governor eliminated?
e) How is the fuel economy impacted?
Thanks!
Member
Joined: Jan 2010
Posts: 201
Likes: 1
From: Buffalo, NY USA
2012 E550 Cab
Ray-
Another MBZ owner asked these questions about the RENNtech tune: can you give your opinion, please?
a) Is the street drive-ability compromised in any way?
b) What about the slight turbo lag I often experience at light throttle... can (is) that be eliminated?
c) Are the transmission shift points altered in either the economy or sport mode?
d) Is the speed governor eliminated?
e) How is the fuel economy impacted?
Thanks!
Another MBZ owner asked these questions about the RENNtech tune: can you give your opinion, please?
a) Is the street drive-ability compromised in any way?
b) What about the slight turbo lag I often experience at light throttle... can (is) that be eliminated?
c) Are the transmission shift points altered in either the economy or sport mode?
d) Is the speed governor eliminated?
e) How is the fuel economy impacted?
Thanks!
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.
My two cents....
Thread Starter
Super Member
Joined: Nov 2007
Posts: 574
Likes: 7
From: Hawaii, (Texas:business)
'12 E550C, Sierra Denali
The following is in response (from RENNtech) to a question on another site re the RENNtech tune for the M278 engine:
"The M278 4.7L V8 Biturbo with a tune will actually perform better all around with the increase(d) torque. Usually customers with heavier 4matics such as S, ML & CL class will notice great(er) initial drive dynamics acceleration increase from stock. It will be comparable in performance acceleration of similar AMG63 class w/o PP biturbo cars. Some other points:
1) Fuel economy will remain same if you can drive the same way after the tune.
2) Speed limiter can be raised upon customer request
3) Transmission adaptation shift points remains same in Comfort or Sport mode.
4) Tune are available (for) optional high flow kat downpipes, and/or modified ECO mode stop start at no additional charge."
"The M278 4.7L V8 Biturbo with a tune will actually perform better all around with the increase(d) torque. Usually customers with heavier 4matics such as S, ML & CL class will notice great(er) initial drive dynamics acceleration increase from stock. It will be comparable in performance acceleration of similar AMG63 class w/o PP biturbo cars. Some other points:
1) Fuel economy will remain same if you can drive the same way after the tune.
2) Speed limiter can be raised upon customer request
3) Transmission adaptation shift points remains same in Comfort or Sport mode.
4) Tune are available (for) optional high flow kat downpipes, and/or modified ECO mode stop start at no additional charge."
Last edited by Dueclaws; Apr 10, 2012 at 12:11 PM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
