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      02-22-2013, 11:29 AM   #1
JerezblackM3
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M3 dyno

Hello all, my m3 dyno before doing software update and retuning and on a hot summer day shows 308.2 ft-lbs of torque at the wheel. Can a full bolt on m3 have that much torque? Calculations on engine torque shows 340 ft-lbs which is 460 nm. I have the graph but I'm using iPhone app. Not sure if I can upload.
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      02-22-2013, 11:37 AM   #2
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Use "simple resize" app to resize your pictures, then you can upload
The tq on the Dyno numbers seems very high. I've seen VT1 kits dyno at 302ft-lbs. Not sure about your numbers. Show the graph. Whats you WHP?
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      02-22-2013, 11:46 AM   #3
JerezblackM3
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387.2 whp
I have stock air filter that day and no scoops.
Old software version as well.

Car has
Eisenmann race exhaust
Custom catless x pipe with resonator
Active autowerke pulley
PP-Performance tune
I'm the dealer for PP-Performance

Car had the stock filter and no scoops. Clients don't like to wait for their orders.
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      02-22-2013, 12:51 PM   #4
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You can have 400wtq if the dyno swings that way.
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      02-22-2013, 03:04 PM   #5
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"Wheel torque" as expressed here is a number that does not exist in real life. The actual wheel torque should be multiplied by the gear and final drive ratios.

The torque numbers presented on dyno charts are simply calculated from the wheel horsepower and engine RPM to represent an "equivalent" flywheel torque number. The real flywheel torque number is actually higher as it does not see powertrain losses.

Either you show wheel torque multiplied by the gear ratio or flywheel torque without the drivetrain losses (which you cannot measure wihout removing the engine). Anything else is a fictive number.

Torque numbers as presented on most chassis dyno charts should only be used as a reference to get an idea of the shape of the torque curve.

I would not dwell too long on the absolute power numbers, even less so on the absolute torque values of the dyno runs. Rather focus on the relative before and after runs to see how much gain you are getting from mods.

Last edited by CanAutM3; 02-25-2013 at 09:54 AM.
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      02-22-2013, 03:11 PM   #6
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Quote:
Originally Posted by CanAutM3 View Post
"Wheel torque" as expressed here is a number that does not exist in real life. The actual wheel torque should be multiplied by the gear and final drive ratios.

The torque numbers presented on dyno charts are simply calculated from the wheel horsepower and engine RPM to represent an "equivalent" flywheel torque number. The real flywheel torque number is actually higher as it does not see powertrain losses.

Either you show wheel torque multiplied by the gear ratio or flywheel torque without the drivetrain losses. Anything else is a fictive number.

Torque numbers as presented on most chassis dyno charts should only be used as a reference to get an idea of the shape of the torque curve.
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      02-22-2013, 03:33 PM   #7
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Do some math at 5252 rpm.
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      02-23-2013, 08:35 AM   #8
JerezblackM3
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Quote:
Originally Posted by CanAutM3
"Wheel torque" as expressed here is a number that does not exist in real life. The actual wheel torque should be multiplied by the gear and final drive ratios.

The torque numbers presented on dyno charts are simply calculated from the wheel horsepower and engine RPM to represent an "equivalent" flywheel torque number. The real flywheel torque number is actually higher as it does not see powertrain losses.

Either you show wheel torque multiplied by the gear ratio or flywheel torque without the drivetrain losses (which you cannot measure wihout removing the engine). Anything else is a fictive number.

Torque numbers as presented on most chassis dyno charts should only be used as a reference to get an idea of the shape of the torque curve.

I would not dwel too long on the absolute power numbers, even less so on the absolute torque values of the dyno runs. Rather focus on the relative before and after runs to see how much gain you are getting from mods.
Thanks for the info. I wish I did a baseline dyno before I did my mods.
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      02-23-2013, 11:49 AM   #9
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Quote:
Originally Posted by CanAutM3 View Post
"Wheel torque" as expressed here is a number that does not exist in real life. The actual wheel torque should be multiplied by the gear and final drive ratios.

The torque numbers presented on dyno charts are simply calculated from the wheel horsepower and engine RPM to represent an "equivalent" flywheel torque number. The real flywheel torque number is actually higher as it does not see powertrain losses.

Either you show wheel torque multiplied by the gear ratio or flywheel torque without the drivetrain losses (which you cannot measure wihout removing the engine). Anything else is a fictive number.

Torque numbers as presented on most chassis dyno charts should only be used as a reference to get an idea of the shape of the torque curve.

I would not dwel too long on the absolute power numbers, even less so on the absolute torque values of the dyno runs. Rather focus on the relative before and after runs to see how much gain you are getting from mods.
+100000 Even in direct drive (4th gear MT 5th gear DCT) the FD is still multiplying torque. Most people don't realize this!!!

To the OP, I think your numbers are high and I have not seen NA torque numbers from and M3 that were that high on a chassis dyno....... The numbers are probably off a bit.
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Last edited by BMRLVR; 02-23-2013 at 11:57 AM.
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      02-23-2013, 08:35 PM   #10
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Quote:
Originally Posted by BMRLVR
Quote:
Originally Posted by CanAutM3 View Post
"Wheel torque" as expressed here is a number that does not exist in real life. The actual wheel torque should be multiplied by the gear and final drive ratios.

The torque numbers presented on dyno charts are simply calculated from the wheel horsepower and engine RPM to represent an "equivalent" flywheel torque number. The real flywheel torque number is actually higher as it does not see powertrain losses.

Either you show wheel torque multiplied by the gear ratio or flywheel torque without the drivetrain losses (which you cannot measure wihout removing the engine). Anything else is a fictive number.

Torque numbers as presented on most chassis dyno charts should only be used as a reference to get an idea of the shape of the torque curve.

I would not dwel too long on the absolute power numbers, even less so on the absolute torque values of the dyno runs. Rather focus on the relative before and after runs to see how much gain you are getting from mods.
+100000 Even in direct drive (4th gear MT 5th gear DCT) the FD is still multiplying torque. Most people don't realize this!!!

To the OP, I think your numbers are high and I have not seen NA torque numbers from and M3 that were that high on a chassis dyno....... The numbers are probably off a bit.
Yes I believe so too, but incredibly, a rally driver and a drift champion who owns an e92 and has a BMW m power maintenance shop tested my car and was amazed with the torque it made.
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      02-25-2013, 09:22 AM   #11
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Nice
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