I havent been around here in awhile. I have been super busy with my job. Anyway I went down to a Dyno Day to tune a few cars and at then end decided to Dyno the wifes SRT-6. It took me awhile to figure out a way to get a soild dyno and somewhat get around the ECU shutting down at 5600 RPM's. Anyway I managed to show it's "peak numbers" without a shut down and also a a solid pull showing it's power band but "with" the shutdown. I then threw in another graph to prove the difference. With a lock-up Torque Converter these cars should roughly make the same power in every gear provided boost levels/tune paramaters are consistant.


I had my MAP Clamp with me and had the intent of tossing it on real quick (should only take 15 min to install) then tuning it in. It was super late and I was exhausted from 6 hours of bouncing between tuning, installing, answering questions, grilling food and doing a few pulls. Then at the end the Dyno's wideband had taken such a hit from the race gas from the days pulls, when we pluged it into the tip of the SRT-6 the cat's wear scrubbing it so much the sensors reading was way off. Ohh well another day... Maybe before I go back a paticular person will have those Catless Down Pipes for sale I want. That way I can just plug right into a Down Pipe...



First Graph is a 4th gear pull showing RPM, but the Mercedes ECU shuts the car down at 5600 RPM, so it's not a full pull to Red Line.

Second is a partial 2nd Gear pull showing the "top end" of 2nd Gear. This was managed without the ECU shutting it down but shows the peak power at Red Line in 2nd Gear. Note the few MPH the Pull goes through.

Third is a graph showing the above 2 graphs and the converter locking up, proving the difference in the 2 graphs. (Note Graph 5 and Graph 3.)


Also I didn't do any of the standard Dyno tricks. No Ice on the S/C, No spraying down the Air to Water with N2O, no dry ice in the Intercooler water, etc. Also I did 5 pulls all back to back to back Run 1 was at 5:41:56, Run 5 was at 5:48:16. So you can add heat Soak in as a likely cause for a portion of the gap between Run 5 and Run 3.

 

What mods on the 6 that produced these numbers?

 

Just a Intake, picked up a used BDJ from SRT Freak for super cheap with K&N Filters. I just couldn't pass up the price. I wasn't a fan of the chrome, so I sand blasted it then rattle caned it.