dc73

Just visited Weistec Engineering and added their Performance tune, filters and plugs to my 13' CLS63. Man, what a transformation. Still drives like stock around town, but an absolute beast when on the gas. Best dollar for HP i have invested, and trust me i have "invested" many a dollar over the years in a number of cars.
If your a SoCal local and have no more than an hour, stop by for this transformation (and impressive facility tour) or contact them to overnight your ECU which they can turn around the same day.

(877) WEISTEC (934-7832)
Sales@weistec.com
http://www.weistec.com/

The guys over there are so helpful and professional. Highly recommended for sure.

Heisenberg

Ugh just when I think I am satisfied with the car stock, I read one of these threads...

That's a beautiful CLS. Where did you get the clear side marker lamps ?

dc73

Trust me, im in the same boat. I have higly modded all my cars and figured with this car i'd be good. The mod is awesome and cant image the car without it.

I got the clear markers http://www.ebay.com/itm/2010-11-S-CLASS-W221-S550-SIDE-MARKER-PARK-LIGHTS-CLEAR-/261261117984?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3AS550&hash=item3cd4604a20&vxp=mtr

ced357

I just had my car tuned by RENNtech and I will concur, this car needs to be unleashed. After a tune, its completely civil when around town and scary fast when needed I suggest everyone tune their Bi-turbo's. Its a new world

B27IL

Cant wait my car reach 1000 miles, then i will tune it

Heisenberg

I'm coming up on 1,000 miles myself. Has anyone tuned a S model ? It obviously comes with a (very) conservative factory tune. Obviously there will be less to gain from the tune compared to a non-S vehicle.

dc73 -

Thanks for the Ebay tip, ordered a set for just over $50 and seller has already shipped them! There are smoked ones available too for those with black or grey cars, I got the clear form my matte white CLS.

hyperion667

sounds good, have any dyno numbers yet?
the side markers are the same as W221 if I recall....


enjoy the ride

allenc63

Did mine year ago. Love it.

DavidE550

Hello guys, I have a 2013 CLS63 with Renntech ECU tune, I also changed the spark plugs and droped in the BMC air fillters. The car is a beast, dyno's at 589whp and 622trq. I was wondering about upgrading the OEM differential to the limited slip one. Would really appreciate any advice.

vdubpower

see what hp number u can get from the eas dyno day on the weekend

adibaiz

I have a Renntech tune and BMC filters also and mine dynoed at 605whp and 674 wtq.

DavidE550

That's awesome numbers, were you running race fuel? Did you do a pre tune dyno, if so what were your base #'s. Also does your CLS63 have a LSD, I was told that makes a difference in how much power the wheels put down. Anyway enjoy the car, sounds like a beast.

AMG E Power

Are u running on a box or dyno tune from renntech?

DavidE550

[QUOTE=AMG E Power;5909294]Are u running on a box or dyno tune from renntech?[/

ECU tune

urbamworm

The difference between you two Renntech tune guys is one is on 93 octane (Florida) and the other is 91 octane (California), so I would assume the 93 octane tune has a little more ignition timing giving the bump in performance.

Nanook

I did the Renntech magic too and agree..I feel the need....for speed

adibaiz

Just an ECU tune, not a RennTech dyno tune, running 93 octane and yes my car has the LSD.

DavidE550

Sounds good, I'm really thinking about upgrading to the LSD, speaking of fuel, has anybody tried Torco accelerant to boost the octane.

Faris63

Good stuff

dc73

Haven't had the car on the dyno, but their tunes for the bi-turbo's are about 608RWHP

Goletiani

Please share Dyno results and also the brand of Dyno.