truth about dynos for 335d/i and M3

neo871 · 02-16-2009, 08:23 AM

is it true that measuring the power & torque of BMWs with "smarter" ECUs like the 335d/i and M3, is only possible with dynos that spin the front wheels too?

may be a stupid think but that's what I've heard.....

doughboy · 02-16-2009, 08:26 AM

When i had my A3 FWD dyno'd you had to remove the ABS/ESP fuse otherwise the car went nuts with stationary rear wheel and moving front ones.

Don't know with BMW though......

Who here has had a 335i/d M3 dyno run?

Imran@Evolve · 02-16-2009, 08:30 AM

Note: Front wheels not spinning

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The car will throw up error codes because the front wheels are not spinning but these clear themselves when the car is driven on the road.

We dyno 335d's and E92 M3's very regularly and dyno them with no issues with the front wheels not moving.

doughboy · 02-16-2009, 08:40 AM

The man has spoken!

neo871 · 02-16-2009, 08:46 AM

wow....your post definitely clears it

the guy who told me this, said that if the front wheels are not spinning the engine will not rev over 3000 rpms (diesel) therefor the dyno would not offer a real figure for power & torque.....

Imran@Evolve · 02-16-2009, 08:52 AM

Quote:

Originally Posted by neo871

wow....your post definitely clears it

the guy who told me this, said that if the front wheels are not spinning the engine will not rev over 3000 rpms (diesel) therefor the dyno would not offer a real figure for power & torque.....

The only tricky thing about dynoing diesel's is if they are auto's. Takes some practice putting the car under load with the box kicking down.

dxb335d · 02-16-2009, 08:55 AM

Sounds like Bullshitsie too me... Never heard of that one.

neo871 · 02-16-2009, 09:31 AM

yeah....that seems pretty strange to me too...
i'll book a measurement session at a "regular" dyno and post the results...(my car in still stock though)

dxb335d · 02-16-2009, 09:35 AM

Look forward to the results bud. You may be only given the WHP (Wheel HP) Due to it being an auto. The Flywheel figure (Bmw quote 286bhp) will be calculated mate.

Id expect to see 230-245bhp at the rear wheels mate.

neo871 · 02-16-2009, 10:37 AM

yep.....I look forward to the results too...

Budgie · 02-16-2009, 10:43 AM

Does the LSD make a difference on a set of rollers?.

dxb335d · 02-16-2009, 10:50 AM

No mate. It wont affect any results.

neo871 · 02-16-2009, 10:50 AM

not sure....but that's a thing i want to find out too....

E92Fan · 02-17-2009, 03:14 AM

Quote:

Originally Posted by neo871

not sure....but that's a thing i want to find out too....

No, the Quaife DOES NOT affect any of the measurements taken by the rollers

02-16-2009, 08:23 AM	#1
neo871 Major 144 Rep 1,399 Posts Drives: 340i xDrive MPPSK Join Date: Jul 2005 Location: Bucharest, Romania iTrader: (0)	truth about dynos for 335d/i and M3 is it true that measuring the power & torque of BMWs with "smarter" ECUs like the 335d/i and M3, is only possible with dynos that spin the front wheels too? may be a stupid think but that's what I've heard.....
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02-16-2009, 08:26 AM	#2
doughboy Major General 1578 Rep 8,971 Posts Drives: 2018 M2 Comp 6MT Join Date: Jan 2009 Location: UK iTrader: (2)	When i had my A3 FWD dyno'd you had to remove the ABS/ESP fuse otherwise the car went nuts with stationary rear wheel and moving front ones. Don't know with BMW though...... Who here has had a 335i/d M3 dyno run?
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02-16-2009, 08:30 AM	#3
Imran@Evolve 5508 Rep 3,825 Posts Drives: All of them Join Date: Jun 2008 Location: Bedfordshire UK iTrader: (0)	Note: Front wheels not spinning [u2b]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/N59dpPXE-1w&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/N59dpPXE-1w&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/u2b] [u2b]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/7dnE_jl0JDI&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/7dnE_jl0JDI&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/u2b] [u2b]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/GHpJTj_Oh6A&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/GHpJTj_Oh6A&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/u2b] The car will throw up error codes because the front wheels are not spinning but these clear themselves when the car is driven on the road. We dyno 335d's and E92 M3's very regularly and dyno them with no issues with the front wheels not moving.
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02-16-2009, 08:40 AM	#4
doughboy Major General 1578 Rep 8,971 Posts Drives: 2018 M2 Comp 6MT Join Date: Jan 2009 Location: UK iTrader: (2)	The man has spoken!
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02-16-2009, 08:46 AM	#5
neo871 Major 144 Rep 1,399 Posts Drives: 340i xDrive MPPSK Join Date: Jul 2005 Location: Bucharest, Romania iTrader: (0)	wow....your post definitely clears it the guy who told me this, said that if the front wheels are not spinning the engine will not rev over 3000 rpms (diesel) therefor the dyno would not offer a real figure for power & torque.....
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02-16-2009, 08:55 AM	#7
dxb335d The Tarmac Terrorist 1015 Rep 29,344 Posts Drives: 997.2 GT3 Join Date: Mar 2007 Location: ''Fandango Towers'' iTrader: (3) Garage List 2010 Porsche 997.2 GT3 [9.50] 2003 BMW E46 M3 [6.00] 2007 BMW E92 335D [5.50]	Sounds like Bullshitsie too me... Never heard of that one. __________________ 997.2 GT3
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02-16-2009, 09:31 AM	#8
neo871 Major 144 Rep 1,399 Posts Drives: 340i xDrive MPPSK Join Date: Jul 2005 Location: Bucharest, Romania iTrader: (0)	yeah....that seems pretty strange to me too... i'll book a measurement session at a "regular" dyno and post the results...(my car in still stock though)
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02-16-2009, 09:35 AM	#9
dxb335d The Tarmac Terrorist 1015 Rep 29,344 Posts Drives: 997.2 GT3 Join Date: Mar 2007 Location: ''Fandango Towers'' iTrader: (3) Garage List 2010 Porsche 997.2 GT3 [9.50] 2003 BMW E46 M3 [6.00] 2007 BMW E92 335D [5.50]	Look forward to the results bud. You may be only given the WHP (Wheel HP) Due to it being an auto. The Flywheel figure (Bmw quote 286bhp) will be calculated mate. Id expect to see 230-245bhp at the rear wheels mate. __________________ 997.2 GT3
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02-16-2009, 10:37 AM	#10
neo871 Major 144 Rep 1,399 Posts Drives: 340i xDrive MPPSK Join Date: Jul 2005 Location: Bucharest, Romania iTrader: (0)	yep.....I look forward to the results too...
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02-16-2009, 10:43 AM	#11
Budgie Major 31 Rep 1,339 Posts Drives: X1 25D M sport Join Date: Nov 2007 Location: BEDS/CAMBS iTrader: (1) Garage List 2017 X1 25 D M Sport [0.00]	Does the LSD make a difference on a set of rollers?.
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02-16-2009, 10:50 AM	#12
dxb335d The Tarmac Terrorist 1015 Rep 29,344 Posts Drives: 997.2 GT3 Join Date: Mar 2007 Location: ''Fandango Towers'' iTrader: (3) Garage List 2010 Porsche 997.2 GT3 [9.50] 2003 BMW E46 M3 [6.00] 2007 BMW E92 335D [5.50]	No mate. It wont affect any results. __________________ 997.2 GT3
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