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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Did a test to compare pre-29.2 vs 29.2+ performance...



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      09-27-2008, 08:36 PM   #1
Rando
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Did a test to compare pre-29.2 vs 29.2+ performance...

...but I need a 29.2+ person to do the tests and report results for comparison.

Here is the test, and my results (pre-29.2). If others could try it and report results (pre/post 29.2, auto/manual, coupe/sedan, tank amount), that would be nice.

Mine was pre-29.2, auto, sedan, stock, ~1/4 tank of gas

On a level road:

40 mph - 60 mph in 6th gear: 8.4 sec
20 mph - 60 mph in 3rd gear: 5.0 sec
0 mph - 60 mph in 2nd gear: 5.7 sec

For each test, you should floor the accelerator (but short of pressing the "kick-down" button).

The first two tests really work the range where 29.2+ is reported to have a lot less torque, so the numbers should be significantly worse (even accounting for "stopwatch" error). The last one is just a full range test, so the gap should be smaller.

If a few folks could try it out (especially an auto sedan), it would be really interesting. It's very quick to do.

Thanks!
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      09-28-2008, 03:25 AM   #2
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would be beter dyno tests
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      09-28-2008, 09:19 AM   #3
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Dyno tests would be great, but since no one is producing them, this is a "poor man's" way of comparing.

I saw that there is one in the main thread, but the other problem with dyno tests is that they often have no data / inconclusive data at the 1,400 rpm range.

If someone could just do the 40-60 mph test in 6th and report their results, that should be enough.
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      09-28-2008, 09:29 AM   #4
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      09-28-2008, 07:50 PM   #5
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Pinging again... anyone want to take 10 minutes and try this? Just the 40 to 60 mph in 6th gear result would be interesting with a 29.2 or newer automatic car... (obviously use the manual mode to keep it in 6th, otherwise it will downshift under load).

It's one thing to yell about it, but it's another thing to make some attempts to quantify the problem until we get a clear dyno result.

If it's something like 200 lb-ft versus 300 lb-ft available at 1,400 rpm, there should be a pretty big difference in the timings.

Last edited by Rando; 09-28-2008 at 08:12 PM.
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      09-29-2008, 07:11 AM   #6
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It not going to be an accurate test unless you drive both cars on the same road. And even at that, there will still be variations. Dyno is the best way.
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