phingoc

Hi.

I want to run my CLK500 on the dyno just for fun, but i have some problems before i can do the actual run.

1. How to disable kickdown? The dealership checked my car and my car doesnt have a kickdown switch. The kickdown function is activated through some potensiometers in the accelerator pedal. So, for the car to not change down when i floor it, what to do?

2. I have an early 2003 clk. This car doesnt have the secret menu with dyno mode in the instrument cluster.. How do i deactivate ESP/ABS and all that stuff?

Glyn M Ruck

The best you can do is turn off the ESP at the dash switch & lock the car in the gear you want to do peak power pulls with the selector/shifter.

phingoc

How do i lock the car in a gear? when i say, change manualy to 4th gear and floor it, it will still change down, and change gear up again to fourth when the revs is near the read line.. but it wont change up to fith gear..

Fatz

I am not sure about the 03 CLK, but my 08 d the selected gear to redline (or neline). don't think you want to "floor in" at the start of a dyno run. You could shift up to the target test gear (4th or 5th - close to a 1-1 gear ratio) and then move the accelerator toward the floor in a consistent, tho quick manner.

That said, I would suggest that you let someone with experience work the controls a couple times before you try it yourself. You need to also make sure someone who knows what they are doing, secures the car. You don't want to be on youtube going 0-80 in 30feet into a wall...... Your wheel speed may get as high as 140-150 mph (if you can turn off enough controls).

phingoc

hmm.. i just removed the accelerator pedal from the car, and guess what i found? a kickdown switch.. My dealer has no clue...:\

unplugged the switch and went for a test dirve... and, no kickdown.

So.. that solved one problem..

I was thinking to remove fuse number 56-59-60 from the engine fuse box.. Those three fuses are the ones for ESP.. will that work?

Kevwood

When I run my car on the dyno, they set the run up by getting the car rolling then they logged the run (mph) to gear change, then they set the run to peak 2 or 3mph lower than that.

Looking forward to seeing your results and most importantly, have fun doing it

Glyn M Ruck

OK ~ You got the kick down out.

Kev ~ do you lock in a maximum gear for pulls?

Kevwood

In my manual cars we pull in 4th gear, I do believe my auto CLK was run in 3rd but I'd have to ask, it's been a while now.

phingoc

The run was succesful.

The numbers:
275bhp (5300rpm)
408Nm (4300rpm)

About 20% power loss in drivetrain, so corrigated numbers are:
330hp
489Nm

2 gear
16 degree C ambient air temp
995mBar ambient air pressure
90% air humidity

Edit: forgot to add that a/f ratio was a bit lean on rpms over 4500. So a mapping specialist is gonna take a look at the car to give it a custom map that will run on E85 and also fixing the lean issue over 4500rpms..

Kevwood

Strong numbers, what mods have you done?

phingoc

No major mods to engine.. changed the exhaust to geniun 63 AMG exhaust.. From cats and back.. No other mods have been done. stock headers, downpipe and cats.

Engine and trans oil are new.. Airfilter is stock.. Im gussing it has never been changed. I just cleaned the filter with some compressed air a few weeks ago. Sparkplugs is also never changed. the car has done 80.000km now.

I bought the car used, so maybe the guy that had the car before me did something i dont know about? It was an old lawyer from germany, so i dont think it has done something to the engine..

M-bENZ

Looks like I need to put mine on the dyno too .

phingoc

Picture of the car doing the run.. A bit messy in the garage, but the guys working there are racing to build 2 cars for this weekends car meeting and racing.. they are building 2 audi RS4 full track spec..

Kevwood

Ahhhhhhhh, Dynapack, that explains a lot.

blackieclk550

HAHAHAHA =D

phingoc

and why is that?

M-bENZ

Lol yea why is that ? Lol

Fatz

I think what they are saying is the 04 clk500 stock is 302 HP. I think there is about a 20% differential between the flywheel and wheel HP (I've noted between a 30% to 19% differential depending on the MB 5XX and the dyno). So, at best on a stock setup the rwhp for a 302 bhp MB would be .81*302 = 244rwhp.

My 08 550 (382 bhp) with kleeman headers and ECU tune (~430 bhp) read 303.6rwhp. Although I think it may be as high 320.

275/302 = .91 or a loss of 9% instead of the norm of 19% to 30% (depending on the engine variant and tuning).

I'm guessing at the meaning of the replies, but I like learning....

Kevwood

No offense meant to be given, to those that know me, they know I'm just a matter of fact guy. The Dynapack dyno is known industry wide as being the most gracious in giving numbers, it reads far higher than other dynos out there, one of the reasons being that the wheels are removed. Most of us here run on 'the heartbreaker', called so because when you think you have a 500hp car you put down 400ish or less. Your (and my) M113s are rated at 302 crank power, according to the Dynapack you're putting down near crank at the wheels in an '03, that's just not reality.

Biggest thing is to have fun with the car, the 209 is a great platform & I've had a bast doing a few things to mine? Again, dont take of fence to my remark, none was intended, it was me realizing why the number was so high.

See you around, great group of guys here to help you out along your modding way.