Okay, first off, kudos to VRP! The ecu tune was a coordinating touch to the previous mods.

I'll try to keep this concise, I have the following mods in order of application, an ASP pulley, Evosport phenolics, Evosport shorty headers and VRP ecu tune.

In order to reduce variability, all runs are on the same dyno, same operator and SAE corrected.

Baseline dyno was impacted by a bad IC pump, and yielded 398hp at the wheels and 447lbs of torque. During this time, I ran a 13.4 at 105 - somewhat disappointing, until I understood the problem.

After having the pump replaced, I estimated the numbers at 428 and 455 with some best guesstimate math.

So then in December of '06, the ASP pulley is installed and it provides dyno run number 11, showing 454rwhp and 531 torque - you could easily feel the difference.

Next, in March of 2007 in 40 degree air, I ran a 12.18 at 114. Not too bad, but i wanted more trap speed given the 40 degree air.
[IMG][/IMG]

Then I toughed out for the next year without any new mods, always looking at the next car but never finding it.

In February of '08, I had the Evosport shorties installed and returned to the track March 21, running a 12.20 at 115.8. I wasn't thrilled, but the ambient was 75F. I could easily project a benefit though, due to the 35 degree temperature increase.

The dyno didn't yield any results in run #15 but, again temperature at dyno time was +17F over the previous (65F) and it makes a difference.

So then comes the VRP ecu tune on May 7th. I put 200 miles on the car and head for the strip on May 9. The times and traps are remarkably consistent, but not really exciting. I run a personal best 12.13 and hit 115.6 in 75 degree air. I can't wait for October ... maybe November.

So today seemed like a cool air day, at about 68F it was close to run #11 which was at 65 degrees. Unfortunately, inside the shop it was 82 stinkin' degrees! Can't a brutha' get some cool air?

However, in spite of the warm air, the car puts out and records highs of 498rwhp and 563tq. Too bad they're not on the same run.

Here is the compilation of the dynos with the 3 mods measured separately. Number 11 is the pulley, #15 is pulley and headers, number 18 is all 3.

The A/F responds nicely to the VRP tune.

[IMG][/IMG]

I don't know what the spike is at 4,800 rpm's but I'm open to your ideas.

Bottom line for me, each mod can be felt in the SOTP, but it requires the ecu tune to maximize the benefit. Beyond the speed, I can see the benefit in the gas mileage and in the fact that the car isn't running pig rich anymore. And I don't need the A/F from the dyno to prove it, I can just look at my exhaust tips.

BTW, the mph on run 18 was 171. I may not ever hit that on the street but at least I know it's there.

VRP rocks.

 

You have a very strong car. And its an 03. Props to you bro. You will be in the 11s in no time. Just add a full mount inter cooler and a pte 160 thermostat and your gonna cool down that beast alot. Add an exhaust and 80mm throttle body and ul b in the 11s for sure.

 

Very nice car and good mods so far.

At almost 490rwhp, I would expect that you should be well into the 11's and trapping around 118-120. Where are you located? Have you run your car with drag radials? If not, you should definitely consider getting a set. 11's wont be a problem at all.

 

Thanks guys, I'm sure that the cool air of autumn will be enough to take me into the 11's. I'm on street tires, I suppose that DR's could get me to 11 more quickly.

If I change the dyno format to DIN correction and 0 smoothing, I get 516 horsepower ... that's about 7% variability. Seems high, but probably normal.

 

Great improvements on the dyno. What are your uncorrected numbers?

I noticed that the pre-VRP ecu runs stopped at about 5,300 rpm, but the post ecu-mod run went well beyond that. Is it because you were hitting the speed limiter in 4th gear before the ecu mod?

 

499.87 (I will be saying 500) and 563.4 tq.

Exactly, the original program cut out at 153, now it cuts at 171.

The dyno automatically cut one run short because the speed exceeded the tire rating. They change the setting and that fixed it.

There was a heavily modded C6 Z06 up next, I stayed to see his numbers ... not even close. He was short by 30hp and 70tq.

 

The uncorrected numbers should be around 474.59 for the last run and 469 for the first two. Your uncorrected numbers multiplied by the correction factor give you the sae numbers.

Thanks for posting the conditions and correction factor, you have a very strong car.

 

Sorry for the confusion, the 499 I quoted came from run 19 which for some reason (unknown to me) was a 3rd gear pull.

I used run 18 to make it apples & apples because the others runs were also 4th gear.

So which method yields the most accurate number? Uncorrected, SAE, DIN?

 

Nice numbers.
Maybe its time for a larger heat exchanger + IC pump.

 

Great numbers. I'm following your path and need only to install the ASP sitting on my workbench and then get the tune done.

 

DFW:

Thank you for posting your graphs.

The glitch in TQ at 4800 is a bug in Dynojet software. I have seen it before. It has nothing to do with car.

Enjoy!!

 

How far from the dyno shop is the track where you run? It must be at a much higher elevation, because if your uncorrected numbers are that high (again - very impressive), your traps should be much, much higher.

 

well, uncorrected is what the car actually made at that given time, place, weather....

SAE is what most like to compare, it's pretty consistant across different dynos and corrects to a standard set of environmental conditions...

Here are a bunch to compare against, add graph and info in there....

http://www.dragtimes.com/Mercedes-Be...no-Sheets.html



.

 

I've always expected higher traps and then been disappointed, the elevation is 500'. Bear in mind, the weight is 4,650 w/driver.

Thanks Fikse, I'm driving a CL, but this is the mod board, so feedback is higher quality and volume.

 

ahh missed that.... your CL is a few hundred pounds heaver than the E55's, which would explain lower traps..... every 100 pounds is worth about 1 MPH..... have you weighed the car?

 

I guess you are carrying over 300 extra pounds, so its going to be 3/10's slower than a similarly powered E. Let's see how you do with lower temps.

 

Thanks for the kind words!! I am always happy when our mods put smiles on your faces. I'm glad you are enjoying the car.

Have fun and drive safe !