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Old 10-08-2012, 06:19 PM
cssnms cssnms is offline
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Location: Murland
 
Join Date: Jan 2011
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Mein Auto: '11 335d
Quote:
Originally Posted by TDIwyse View Post
So I'm not happy with the update rate on the Torque app for measuring HP/Torque numbers. And the Bavarian Technic ECM reported torque #'s appear to be based on calculations of other engine parameters (and it's update rate is pretty slow as well).

So, I broke out my old GTech Pro. However I was unable to lock-on to an rpm signal when connected to the power outlets due to BMW doing such a good job filtering the noise. So I cludged together a way to power the GTech from the battery and got a crystal clear rpm signal.

Then I found a local car whose owner has a BT and a JBD that is modified for in-cab adjustability.

http://www.bimmerfest.com/forums/sho...d.php?t=573553

Last night was near perfect conditions. 70F and no wind. Said vehicle had just completed a DPF regen and had a full tank of fuel. The D is supposed to weight ~3804 lbs according to insideline (http://www.insideline.com/bmw/3-seri...full-test.html) and with the driver and some items in the trunk it would be total ~4000 lbs.

The runs below are with the JBD at 0, 1 switch thrown (~65%), both switches thrown (~85%).

Procedure was over the same stretch of flat road (interstate), gently accelerating in 1st to 2nd then getting into 3rd gear before giving it the fuel, then letting up at ~80mph so I didn't run the risk of loosing my license if . . .

The numbers include not only loss of the tranny and tires, like a rolling dyno, but also the loss due to wind resistance. Looks like the Cd and A for the e90 is 0.26 and 2.17m^2. Using this (http://www.gtechprosupport.com/support/AeroDragCalc.php) says that at 80mph there's roughly 21 hp lost due to wind.

I'll post some of the BT data later of some runs that has some interesting data. Unfortunately it was trying to record too much data and the time steps between readings is larger than I'd like. But things like EGT's, DPF pressures, injection timing, etc are there.
Quote:
Originally Posted by TDIwyse View Post
A couple more pulls were performed after getting some local fuel back in the tank (~1/2 tank added after long drive the previous night). Think the other fuel was less than optimum based on these results.

Temp was more than 10F warmer than previous testing. Below shows comparisons of the remap stacked with JBD at 0 and ~65%. The "Main" and Run 1 are 0%, Runs 2/3 are 65%. Again, was being careful not to give full fuel at low rpm's . . .

Also showing some of the "speed" data which is interesting. For these 3rd gear pulls the full fueling is occuring between ~45-75mph. The 50-70 times are thus right in the main thrust of the test. The reported times are nice.

Also, still not seeing any engine parameters that are over stressed. Although the pulls happen so fast that this is somewhat expected. If you were continuing this kind of stress (towing or racing for example) it would likely be a much different story.
What is interesting between these two comparisons is that it appears the JBD alone set to 0% is only 17hp off the Evolve and JBD combo set to 0 and 8 torque off. One would think that having the Evolve tune would yield more of gain than that when stacked with the JBD. Perhaps it had something to do with not giving full fueling at the lower RPM range?

By any chance do you have data for Evolve alone? I might have missed it.

Last edited by cssnms; 10-08-2012 at 06:22 PM.
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