550i Dyno Results
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From: Richmond, VA
I did 3 runs, the last two were fairly consistent. Below are the results:
289.95 - HP
289.28 - TQ
297.45 - HP
299.04 - TQ
297.07 - HP
294.56 - TQ
Attached is the Dyno Sheet, the lines are faint and I hope they show up. If not, I will paraphrase below:
On best run, TQ peaked at about 3,400 rpm and stayed flat through 4,700 rpm - The entire TQ curve is relatively flat.
On best run, HP peaked at about 6,300 rpm
Air/Fuel started at 15 (1,300 rpm) dropped off quickly to 14 (1,700 rpm), then dropped off gradually to about 13.3 (5,700 rpm), then dropped off to 12.2 (6,500 rpm).
Doing the calcs, it shows a 17.38% HP parasitic loss and a 16.93% TQ parasitic loss. I always assumed a 15%-18% loss, so it appears to be in the range.
After the runs, the computer threw a bunch of codes. They all went away after a few stop/start cycles.
I didn't do the dyno to prove a point or compare "Johnsons" with other 550i's, I just did it out of curiosity. Hopefully this info will be useful to others.
Al
289.95 - HP
289.28 - TQ
297.45 - HP
299.04 - TQ
297.07 - HP
294.56 - TQ
Attached is the Dyno Sheet, the lines are faint and I hope they show up. If not, I will paraphrase below:
On best run, TQ peaked at about 3,400 rpm and stayed flat through 4,700 rpm - The entire TQ curve is relatively flat.
On best run, HP peaked at about 6,300 rpm
Air/Fuel started at 15 (1,300 rpm) dropped off quickly to 14 (1,700 rpm), then dropped off gradually to about 13.3 (5,700 rpm), then dropped off to 12.2 (6,500 rpm).
Doing the calcs, it shows a 17.38% HP parasitic loss and a 16.93% TQ parasitic loss. I always assumed a 15%-18% loss, so it appears to be in the range.
After the runs, the computer threw a bunch of codes. They all went away after a few stop/start cycles.
I didn't do the dyno to prove a point or compare "Johnsons" with other 550i's, I just did it out of curiosity. Hopefully this info will be useful to others.
Al
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My Ride: (USA) 645Ci, Silver Gray, Chateau, Cold Weather PKG, Premium Sound PKG, Sport PKG, Step, NAV [Std Equip in 645], HUD, Satellite (SIRIUS) Radio, Aux Input, Bluetooth enabled using iPhone 3GS w/ adapter cradle - Build date - 01/05, Baby delivered 2/24/05
ALways good to have a base line.
Too bad you did not have time to put Charcoal Filter back in to test. May not have proved anything, but you never know.
Too bad you did not have time to put Charcoal Filter back in to test. May not have proved anything, but you never know.
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My Ride: 2006 550i SMG
Originally Posted by cobradav' post='507781' date='Dec 17 2007, 04:03 PM
ALways good to have a base line.
Too bad you did not have time to put Charcoal Filter back in to test. May not have proved anything, but you never know.
Too bad you did not have time to put Charcoal Filter back in to test. May not have proved anything, but you never know.
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From: Richmond, VA
Originally Posted by AlexFW' post='507791' date='Dec 17 2007, 04:21 PM
The manual 550i should have about 330 WHP 
330 whp is a 8.3% parasitic loss for a 550i. Not that I am being defensive about my numbers, but is totally unreasonable to expect that kind of output.
Al
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My Ride: 545i SMG with Limited Slip Differential
Model Year: 2005
Originally Posted by my530i' post='507835' date='Dec 17 2007, 11:44 PM
No. That's only applied to 545i 
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From: Italy, Milano
My Ride: 545i SMG with Limited Slip Differential
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Originally Posted by AlB' post='507973' date='Dec 18 2007, 05:50 AM
My E39 M5 had 332whp as a comparison, so I figure my runs were ballpark for a 550i
330 whp is a 8.3% parasitic loss for a 550i. Not that I am being defensive about my numbers, but is totally unreasonable to expect that kind of output.
Al
330 whp is a 8.3% parasitic loss for a 550i. Not that I am being defensive about my numbers, but is totally unreasonable to expect that kind of output.
Al
bye!
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Here are two Rototests one of a 645iA and one a 550iA. I think you can expect less loss with Rototest since they are dismounting the wheels and attach the measure equipment directly on the car.
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From: Italy, Milano
My Ride: 545i SMG with Limited Slip Differential
Model Year: 2005
Originally Posted by ipp' post='508032' date='Dec 18 2007, 10:40 AM
Here are two Rototests one of a 645iA and one a 550iA. I think you can expect less loss with Rototest since they are dismounting the wheels and attach the measure equipment directly on the car.
Yes, I saw those tests, 315 WHP for the 4.8 steptronic then theorically the manual should be +15 .