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Apparently the traction control on 2002 and 2003 M5's can not be totally defeated unless the software is re-written. Something about the rear wheels spinning at 5300 rpm with the front wheels stationary that annoys the ECU. Before we started, KTR Performance predicted the shut down at 5300 rpm, and that's where it occurred. Some interesting results surfaced however from dynoing my 2003 M5 with 11000 miles. 1) The sportbutton had a measurable increase of between 5 &7 hp & tq above 3250 rpm. 2) The air fuel ratio increased from a fairly constant 11.5 to a fairly constant 12.5 when the sport button was activated. (Does this mean it is more ecconomical to drive with the sport button engaged?) 3) Torque was flat between 2500rpm to 4750rpm @ between 300 ft lbs to a max of 307 ft lbs @ 3500rpm. (all figures are at the wheel) They use 19% loss which seems too high. A 16% loss places the engine @ 365 ft lbs. 4) Max hp @ 5000rpm before shut down was 282hp at the wheel, or 335hp at the crank. 5) KTR Performance says the results are +- 5%. They also dyno my 1998 M3 the same day. Underdrive pulleys and a Conforti program yielded 191hp and 200 ft lbs at the wheels. The point is that the dynamometer they use is not very aggresive. 6) There is an interesting article in the July issue of European Car that focuses on chips in general and Powerchip specifically. Best Regards, Doug
 

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831 streeter said:
Apparently the traction control on 2002 and 2003 M5's can not be totally defeated unless the software is re-written. Something about the rear wheels spinning at 5300 rpm with the front wheels stationary that annoys the ECU. Before we started, KTR Performance predicted the shut down at 5300 rpm, and that's where it occurred. Some interesting results surfaced however from dynoing my 2003 M5 with 11000 miles. 1) The sportbutton had a measurable increase of between 5 &7 hp & tq above 3250 rpm. 2) The air fuel ratio increased from a fairly constant 11.5 to a fairly constant 12.5 when the sport button was activated. (Does this mean it is more ecconomical to drive with the sport button engaged?) 3) Torque was flat between 2500rpm to 4750rpm @ between 300 ft lbs to a max of 307 ft lbs @ 3500rpm. (all figures are at the wheel) They use 19% loss which seems too high. A 16% loss places the engine @ 365 ft lbs. 4) Max hp @ 5000rpm before shut down was 282hp at the wheel, or 335hp at the crank. 5) KTR Performance says the results are +- 5%. They also dyno my 1998 M3 the same day. Underdrive pulleys and a Conforti program yielded 191hp and 200 ft lbs at the wheels. The point is that the dynamometer they use is not very aggresive. 6) There is an interesting article in the July issue of European Car that focuses on chips in general and Powerchip specifically. Best Regards, Doug
Open glove box, find fuse panel, pull fuses 17 and (30 or 31, can't recall), redyno!!
Regards,
Jerry
 

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you should have searched here first. Like jerry says, fuse 17 and 30 will disable the dsc (and abs, i think). From a technical perspective, sport on should have no effect on hp, it just has the throttle bodies open a little faster, but in sport or normal, wot is wot...
Mike
 

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I may be wrong but I've heard fuses 17 & 30 pulled allow an '02 to be dyno'd but not an '03. Your torque numbers sound right so the hp would be close to norm up to the 5300 rpm cutoff.
 

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I dyno'd my '03 with those fuses pulled ...
 

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Richard in NC said:
I may be wrong but I've heard fuses 17 & 30 pulled allow an '02 to be dyno'd but not an '03. Your torque numbers sound right so the hp would be close to norm up to the 5300 rpm cutoff.
I've also seen 03's dynoed with this method.
Mike
 

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Thats right!

Pull fuses 17 and 30, which will disable DSC, this will also result in the "sport" function being disabled too! There's not much you can do about it!

I dont think the "sport" feature increases your power!
 
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