Trimmer2

dupe

Trimmer2

Here's a link to their site:


http://www.renntechmercedes.com/www/catalog/398

smayshusband

already Looked Into it, I Think Either Brabus Or Carlsson Is The Way To Go. The Only Thing That Makes Me Hesitate Is That They Want To Replace The Spark Plugs Because Of an Idling Issue

cyberorth

Thank you!

smayshusband

okay so I looked into it and renntech is the only company that wants you to change the spark plugs, they offer a two year warranty on their tune and horse power increases to 630 and 656 pounds of torque on the other hand brabus performs an ECU tune and auxiliary intercooler for a whopping 650 horsepower and 732 pound feet of torque that comes with a Mercedes backed four-year 50,000 mile warranty. I don't think you can beat that. Brabus also offers a exhaust valve control that is located in the cabin

patsy1099

Whether or not to change the plugs depends on what plugs (OEM) are being used and how much extra hp/tq, in the form of boost pressure, etc. is being created in the engine. The OEM plugs are matched to deal with a certain level of combustion. If you increase that pressure beyond a certain point it is usually a good idea to replace the plugs by going "1 step colder" than your current OEM plugs. This prevents misfires, keeps the boost throughout the rpm range, and prevents you from melting anything in your engine!

The ECU tune for the 63 isn't really giving you huge gains so you might be just fine with OEM plugs. The gains on the GL450/550 however are huge (adding ~140hp & 150tq) because they are so detuned (especially the 450) so changing the plugs is highly recommended.

Last thing I would say is that I respect Renntech a lot. Great company. What I think is VERY unfortunate is how much they markup their spark plugs/filters. It's like 2.5 times! They already are making a lot on their tune.....a lot.....also whacking you for the simple add-ons is unnecessary (IMO).

sam9187

Interesting Pic of a GL63:

http://www.autogespot.nl/mercedes-be...166/2013/07/25

BlownV8

I would be willing to bet that the Renntech tune produces very close to or more than the Brabus tune. Renntech also has different levels of tunes and modifications. I have found that Renntech understates their power gains while others overstate. Also, Renntech offers additional power upgrades. How many record breaking Brabus tuned cars do you see running around. Renntech seems to have all the records.

Who is telling you that Mercedes is going to back the Brabus tune and modifications? Mercedes won't warranty anyone elses work especially if it causes damages. However, MB has the burden of the Magnuson-Moss warranty act that does not let them void a warranty based on modifications. They have to prove that the mods caused the damage.

Here is what you really need if you want some speed for the 63 bi-turbo engine. 833 hp and 980 tq. http://www.renntechmercedes.com/www/node/1130

smayshusband

Brabus Claims More Horse PowerThan RennTech, probably Don't See To Many Brabus Cars Because They Are So God Damn expensive. I Spoke To Two different Guys At Brabus And They Both Confirmed That Their Modifications Would Not Void Mercedes Factory Warranty ! I Think That Is Reason Alone To Go With Brabus. The Only Thing That Turns Me Off About RennTech Is They tune Different Manufactures and Don't Focus Strictly On Mercedes.

smayshusband

Also RennTech Wants You To Send out Your Ecu, while Brabus Makes A Module That Piggy backs The ecu.....
At The End Of The Day Same ****, Different Toilet

BlownV8

Modifications don't void factory warranties. See Magnuson-Moss Warranty Act. Brabus does not have any special conditions with Mercedes. Every tuner can say the same thing.

There are many other companies that offer "block tuners" like Brabus. I see some budget tuners around here using those so it's definitely not a premium product. It does sound enticing but I'm not sure if there are drawbacks to that method of tuning the ECU or not.

MAD GL63

My GL63 chasing a SLS GT Coupe at the Mission race way. Small tight track with lots of turns so hard to get the speed up but a heck of a lot fun anyway! Didn't have many chances to peek at the odometer of my car but caught it once at 155kph before slowing for a hairpin turn. Fastest so far remains 205kph!

South Ocean1

Mad GL63

That was a super cool photo. How did it feel on the track?

sam9187

2014 GL63s now showing in dealer inventories along with other 2014 GL models

http://www.cars.com/for-sale/new/201...102&mdId=29629

sam9187

GL63 in a matte paint

http://www.autogespot.nl/mercedes-be...166/2013/07/27

tony cls63

Hey guys and gals got my vin# today...My GL63 is on the rail and should be at my Long Island dealer in the next week or so

sam9187

Congrats. I have a schedule date of 7/28 also so hopefully I will have some news from the dealer on Monday.

tony cls63

Sam that was also my schedule date 7/28

Tomshop

Tony,

Congratulations. It has been a long haul!

Trimmer2

Shiny, tuned and in the garage

GrnLantern

Nice. Congrats.

tony cls63

With that tune did you have to change the plugs ?
I plan on getting rennteck also
thanks

Trimmer2

I don't think I 'had' to but, it was encouraged and consistent with my homework. I swapped out the air filters too.

Foot hits accelerator Weds evening....

sam9187

Did you have the dealer do the tune?
Which spark plugs did you get?
Which air filter?

Thanks

Trimmer2

The Google Machine works great for your questions.



http://www.renntechmercedes.com