Woody,
Let me go into detail on the two runs that I did...the first run with no mods to the sensors done, I pressed the traction control button off, and I started to drive. The esp light kept on flashing. Then, the rpms cut at 4,200 rpms. The dyno was saying about 175 rwtq. The second time around, we disconnected the rear wheel sensors, and I attempt the run once again. This time, the esp light did not flash at all. BUT, the vehicle was still limited to 4,200 rpm, but we gained about 20 more lb/ft of torque on the dyno, meaning the sensors were engaging the brakes to restrict power output on the first run. On Friday we will be attempting another run. Here's my theory...the car, when rolling at a speed of greater than 10 mph, can be revved to 6,100 rpm without restrictions. So, on Friday we will have the front tires in the air, two people will spin the tires to go over 10 mph, and then we will attempt another dyno run, hopefully disengaging the limiter. Everyone cross their fingers for this to work.

 

Thanks for the clarification Golfdude, for a minute there I thought you had managed to unlock the secrets of the ABS and managed a full range run. Odd that you got a difference with the rear sensors un hooked though. AFAIK to get a full unrestricted run the system has to see 4 coherent signals from the wheels at a speed over 15 km/h (from memory). Good luck with spinning the front wheels - that's going to be one hell of a sight and plenty of opportunity to take a picture for a forum caption competition. I think you may need to spin the fronts a lot faster though if the rears are at full speed, as the system also does a rationality check on the signals too. Anyway, best of luck!

 

Hahaha...i don't think we have enough people to take pics! Thanks for the good wishes.

 

I too would like to know how they got that engine up to 6,200 RPM... mine sounded like it was gonna explode at 5,950 RPM!

I also found a AWD (4 wheel drive) dyno and had a full pull done on my SRT6... good results, less than expected, but consistent and it only cost me $80.

By the way here's the thread with my REAL dyno results... the first was a misunderstanding by myself and the technician (Paul), the second was a good pull with real numbers. Disappointing to me, but more real and good pulls.

And a picture of the car on the dyno before being strapped down... just for fun...

 

Man, that car looks so cool in black!
Just out of curiosity Timelord, the next time you rotate your tires, can you get a weight for one rim?
I'm thinking that the srt rims might be a forged wheel but I can't find any information to confirm this. If they are forged wheels I'll be looking for a set to put on my limited.

 

I'll be changing them out for another set of rims with winter/all season tires on them for my trip in december.

When I pull these I'll definitely weigh one for you.

 

those number can't be right, you should be at about 275. something was up. did you say you used a mustang dyno, because those things usually rob you 5-10 percent.

 

no, he should be around 251 hp.
24% loss in automatic driveline from 330 hp, it sounds just right to me.

 

go check mbworld forums. don't forget this engine has been dynoed a bunch of times in another car, even with the same tranny.

 

how about posting a link, I'm just saying a 24% loss in an automatic tranny is usually the norm. Also the SRT is rated at 330hp I believe. While the SLK32 AMG is tuned for higher output, I think the MBZ rated the SLK AMG at 350 hp so that car will put down 266 hp to the ground.

 

ok i'll waste my time finding a link saying the benz put down so much whp and that mustang dyno's and most awd dyno's suck if you post one that says automatic rwd cars lose 24%. sound fair?

i took the time as a nice guy and did it.
http://www.benzworld.org/forums/r170...-amg-meet.html
292-298 horses at the wheels for 3 different slk32's. that's around 15% drive train loss. and yes they car is rated 19 hp higher than the srt-6, which would equal about 16 whp, so was happened to mmz's other 30+ wheel hp. and guess where that 30 whp puts him, at 280, right were i assumed it would be.

 

x'ed,

You are probably correct in a way. The AWD dyno probably is expecting drive power at BOTH sets of rollers even though they are connected by a belt system.

That said, this was the only way round the fact that the Crossfire seems to lack the 'dyno mode' that the SLK32 has.

If we 'fudge' the numbers and add that 30 whp back in, then yes, you are correct it's about what is expected and what another SRT6 owner dynoed at over in the UK.

You can see his numbers here. My only question to ichon is what did they do to get around the lack of 'dyno' mode besides being on an AWD dyno?

 

Yeah that makes sense. I totally forgot about that massive front roller on the mustangdyno. But I'm impressed that the auto tranny only has 15% drivetrain loss, pretty efficient! Thanks for wasting your time to back up your claims!

 

no problem, i always do. ; )

 

so if you Autostick guys are loosing 15% in your drive train, how much drag do you think the 6 speed has, 10% maybe?? that seems a little low, I can't imagine 6 speed xf is putting ~ 190 hp to the ground!

 

Based on my last dyno a few weeks ago (5,000 rpm cut out still) I'm putting 192 to the wheels at 4,875 rpm and was slightly climbing when the engine cut... torque was right at 212 @ 4,200 and flattened out, but I have quite a few mods and was running propylene oxide in the fuel.

This was my second dyno pull and had an increase of 8 hp from the last mod, which was the PO in the fuel and custom racing exhaust with removed cats.

 

Holy smokes HDDP! That's some serious power, maybe you can PM me later with a list of what mods you've made? I know you don't want to advertise your set up. Also what is your all up weight on the car?

 

Good job. I want to grow up to be just like HDDP! I'm serious too!

 

I don't know if it's a radical increase over the stock vehicle, or not. Because like a dumb A.S.S. I never got a dyno run on the car before we started modding it last year... And I still can't get a darn full RPM dyno...

The only other dyno run I have seen from a stock Crossfire was from Woody which was done also with the 5 k cut out and also his was done in some terrible heat 90 degrees +... I don't think he got full power and showed 156 hp...

So until I see another stock Crossfire dyno, I'm not going to jump up and down with joy...

 

I dynoed my car too and I was able to go all the way to 6,300 rpm! Check out my previously started thread for more info on how it was done. I got 168 rwhp and 178 tq.