art@kronen

Hello guys,

Just want to help Eric out here to post his baseline/post mod dyno sheets. I am awaiting from DynoComp to give me the numbers but what i am hearing makes me grin from ear to ear. Eric's car had a 100 rwhp gain!

art@kronen

Here you go guys.

Heisenberg

Damn, this was posted before I even got home

A few of my comments:

1. Post-mod dyno was obtained with 3/4 tank of 91 octane fuel, topped off with 1/4 tank of 100 octane racing fuel. Pre-mod dyno was with only the 91 octane. Arizona summer fuel is crap and the 91 octane rating on our "premium" grade is probably optimistic.

2. HP gains are as promised, car is probably achieving close to 600 at the crank if you account for drivetrain losses, figure somewhere in the 1.19 - 1.26 range.

3. TQ gains are somewhat less, but look at the TQ from the stock engine -- about 460 ft-lbs at the rear wheels! This is quite a bit higher than the AMG spec. Stock HP is right around the AMG spec (may have been higher if better fuel was used during the pre-mod dyno).

4. I've read that Dyno-Dynomatics give lower HP & TQ numbers -- up to 10% -- than the Dyno Jet. For ****s and giggles, I may also get the car tested on a Dyno Jet for comparison.



It is nice to have the data showing the mods perform as advertised. Richard and Dyno-Comp do first class work, there have been zero problems since I picked the car up and it is about as fast as a two ton, rear wheel drive vehicle can be. Despite this, overall drivability has improved since more power seems available from low RPMs. Exhaust sounds great too, the roar during the dyno testing was pretty awesome I should have 1/4 mi times pretty soon -- hoping to be in the 11s.

art@kronen

Sorry Eric! I was too excited. But congratulations and on behalf of Richard, DynoComp, Kronen and Renntech, drive safe and have fun!

SLK55R

welcome to the Renntech Brotherhood!

art@kronen

Lol!!!!

goalie_k

Nice numbers....

JamE55

What is the rwhp? Sorry can't tell from the graph.

Heisenberg

~ 478 rwhp

JamE55

^^ Thanks.

art@kronen

Eric, i think you forgotten to give special thanks to me too!

Fikse

very nice! what does stage 5 include?? put it on the dynojet if you get around to it.... would be interesting to see any differences.....

art@kronen

Stage 5

ECU
Pulley
Headers
Throttlebody
CF airbox.

Heisenberg

A few pics, interior and engine compartment

Heisenberg

Exterior pics... will try to talk my gorgeous wife into posing with the car later

Let me know what you think of the drop. Module is set so that there is a 2" gap between top of the reverse chrome lip and the top of the fender arch in the front and back. Ground to fender distance is 1/8" higher in the rear than the front.

There is enough drop that camber is probably too much. I need to get an alignment and have either crash bolts or adjustable links added to fix this, otherwise the Pirelli PZeros will be done in a few thousand miles.

SLK55R

Looks amazing ... drop looks good. Get the wife in the pics!

art@kronen

Eric, as usual, your car is one of the best looking CLS nationwide. Thank you for joining our Renntech brotherhood.

Cylinder Head

iTrader: (1)

Seriously dude, let me know when you're selling that thing, because you officially have my dream car.

Redbud

Spec-f'in-tacular...

More pics of the rear seats PLIZ!

art@kronen

Oh btw Eric, I am leaving Kronen effective Aug 1. Feel free to call me if you do need help.

Grumpy666

Were you able to drive the car aggressively before the dyno pull? It takes the ECU a little while to adapt to the increased octane. If not, your actual HP numbers with the fuel mix may be a little higher.


The accepted standard for DT loss for this car is 19%. That puts your crank HP at 590.


You're making similar power to cars that have ECU, pulley, and headers (540 rwt / 475 rwhp). I would expect your mods to produce about about 25 more HP. But looking at your pre-mod dyno, your level is low compared to other cars on this forum. The average stock dyno shows about 410 rwhp. You may be seeing the effect of Az summers in these plots. Do you know if any environmental corrections were applied to the plots?


That would imply that you're making almost 50 HP more than what is shown. I don't think this is the case - Dyno-Comp has a good reputation.

Looking at your post-mod torque graph, there's about a 20 lb-ft dip between 3200 and 4300 RPM. This may be tire slip, but could also be caused by A/F ratio. Can you post the A/F ratio graph for this run?

Kevin M.

Looks great Eric, nice door locks
My dealer had your car fully loaded with 030 package, someone ordered it, and financing fell through, has 400 miles on it. I love that interior!!

So even with the new Renntech module your still getting a camber issue?
Did you have a camber issue when you had the washers on?

Also how many fingers can you stick between the top of the wheel and the fender on the front and rear?

Thericker

More importantly what is yours? You never came thru w/##'s what's the deal inquiring minds want to know??

Freakin awesome CLS 1 of the best I've ever seen!!

Heisenberg

Thanks for the compliments guys. Sorry Cylinder Head, but I think I'll be keeping this one for a while. I'm very glad I pulled the trigger on a 55 rather than wait for the 63.

The camber issue is inevitable when you lower, whether by Star Diagnostics or electronics module or mechanical means (washers, longer links, etc). When the car lowers the wheels don't move straight up or down but rather in an arc. With the washers and bracket repositioning I only achieved a drop of about 0.75". My drop is now at least 1.5" with the module, and along with the increased drop is the further deviation in camber. I can barely get one finger in the gap now, both front and back.

Grumpy thanks for your analysis. I appreciate comments from you and others who are knowledgable about this stuff.

I'll try to address some of your points...

I had fairly little driving between the modifications and the subsequent dyno, and even less driving (probably 20-30 miles) after the quarter tank of 100 octane racing fuel was added to the three-quarter tank of crap Arizona summer premium fuel. You are correct that the ECU may not have yet optimized the timing.

I have seen DT loss mentioned at 1.19 before. Renntech estimates 1.23 and the owner of Dyno-Comp seems it may be higher, up to 1.26. Regardless, I think Renntech's performance claims for PP5 (574 HP, 626 TQ) are probably being met on my car.

As far as the stock power, I think it may have been affected by the poor quality summer fuel here in Arizona. Although premium is sold as 91 octane, that is apparently very optimistic. So the ECU may have been retarding ignition timing. Now that I know where 100 octane fuel is available, I'll add some of this each time I fill up to get the equivalent of 93.

The fuel-air mixture data was not given to me, and I don't know if it was even obtained (maybe Adam can find out from Richard and post it if available). If the A/F mixture were suboptimal, would it not be unusual to have the affects only apparent at 3200-4300 rpm ? Some tire slippage is certainly possible.

I'm not aware of any environmental corrections made on the dyno. It has been hot as hell here recently -- 119 degrees today -- but the dyno is performed in their air conditioned workshop, with commercial blowers aimed at the heat exchangers. Still it probably was well over 80 in the workshop, with very dry air of course.

Since I haven't gotten the car tested on a Dyno Jet I have no idea how different the numbers would be. Now I've read the Dyno Dynomatics often give lower numbers than the Dyno Jet, up to 10%. My guess is that the machine at Dyno-Comp is pretty accurate for rwhp, and that many of the crank power numbers derived from Dyno Jet machines are overly optimistic. There are some shops with a Dyno Jet in the area, so one of these days I'll get the car tested on one.

No luck getting the wife to pose today but will keep trying

Trekman

adam your leaving Kronen? who will be our contact for future mods?