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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > DYNO TEST OUTCOME at TECHNIK: Tech details, VIDEO, etc.



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      06-22-2006, 07:05 PM   #89
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Quote:
Originally Posted by ADHD
Shit my cells were hiding when I posted the question! DUHH post means after

Very curius to see the 325step results?????
Unfortunately, no 325i Step owners dyno'd their cars that day. We had two 330i 6MT, three 330i Steps, two 325i 6MTs and one S2000 Honda--a total of 8 cars tested plus the guy with the e46 M3.
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      08-16-2006, 02:32 PM   #90
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I just found this dyno of an E90 325i 6MT posted on another website forum.

Something looks amiss here, because that 325i is posting figures just under what our 330i's performed at. However, keep in mind that our dynos were done under different run conditions:

87.94 degrees F compared with 59.47 degrees F, and 35% vs 24% humidity.
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      08-16-2006, 05:17 PM   #91
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      08-16-2006, 10:04 PM   #92
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Just some more info on Dynos.

Typically, a Dynojet dynamometer will record a "loss" of 15-18% for manual drivetrains, and 22-25% for automatic drivetrains. The Dynojet dynos are passive rolling load type dynamometers, so the vehicle is tested while accelerating. Some additional energy is lost accelerating the engine and drivetrain components themselves, so there is not really this much "loss", but that is for another technical discussion. If you have ever wondered why manual transmission equipped cars are generally faster than their automatic counterparts, the difference in drivetrain efficiency is a big part of that, along with the fact that manuals tend to have an extra gear with more aggressive ratios than automatic transmissions. Here is a very good article about the Dynos and also how tire and wheel sizes/weight can make a difference. http://www.maxima.org/shoptalk/sub_r...ns/index.shtml
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      08-17-2006, 03:45 AM   #93
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Quote:
Originally Posted by Asiann
Just some more info on Dynos.

Typically, a Dynojet dynamometer will record a "loss" of 15-18% for manual drivetrains, and 22-25% for automatic drivetrains. The Dynojet dynos are passive rolling load type dynamometers, so the vehicle is tested while accelerating. Some additional energy is lost accelerating the engine and drivetrain components themselves, so there is not really this much "loss", but that is for another technical discussion. If you have ever wondered why manual transmission equipped cars are generally faster than their automatic counterparts, the difference in drivetrain efficiency is a big part of that, along with the fact that manuals tend to have an extra gear with more aggressive ratios than automatic transmissions. Here is a very good article about the Dynos and also how tire and wheel sizes/weight can make a difference. http://www.maxima.org/shoptalk/sub_r...ns/index.shtml
Amazing info... thanx!
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      08-21-2006, 01:25 PM   #94
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Quote:
Originally Posted by Asiann
Just some more info on Dynos.

Typically, a Dynojet dynamometer will record a "loss" of 15-18% for manual drivetrains, and 22-25% for automatic drivetrains. The Dynojet dynos are passive rolling load type dynamometers, so the vehicle is tested while accelerating. Some additional energy is lost accelerating the engine and drivetrain components themselves, so there is not really this much "loss", but that is for another technical discussion. If you have ever wondered why manual transmission equipped cars are generally faster than their automatic counterparts, the difference in drivetrain efficiency is a big part of that, along with the fact that manuals tend to have an extra gear with more aggressive ratios than automatic transmissions. Here is a very good article about the Dynos and also how tire and wheel sizes/weight can make a difference. http://www.maxima.org/shoptalk/sub_r...ns/index.shtml

thanks, that's actually really good info!
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      09-08-2006, 01:40 AM   #95
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ADHD's dyno added to collection for comparison. Just note this was done on a different day.
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