grogan545

Lots of breaking loose by just applying the gas. I don't do brake torquing. But, incidentally, the shop foreman did it on my car. I asked if he thought that doing so can be a problem. He said, no, unless done too reptetitively.
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I am glad to here that your shop forman brake torques.I mentioned previously that I did't think it was a problem.This method is done extensively at the drag strip,but automatic transmission failures are very rare.Unless you hold the brake for a long period of time(more than 3 minutes)you don't heat the trans fluid significantly.Overheating an auto trans is the biggest cause of failure.

znod

That's what the foreman said too--about the heating. New better results on the way.

znod

Hi Friends:

I have some new better results to share--from 4:30 a.m. That's dedication, right?.

But, first, while these results are coming closer to my pre-20.01.00, let's don't get too enthusiatic yet (but, I am glad for what I see). The point is that all of my post-20.01.00 results have been on 40 degree mornings. Previously, I had much trouble getting traction on such mornings so most, if not all, of my better "pre" runs were in 50 to 60 degree temperatures.

One important point to make is that the new results support the idea the the Step is shifting well. Howver, given, this observation, they also support the view that the 20.01.00 is having some "extra" trouble getting to 60 as fast as before.

Third, the HP numbers, which I did not include before, look good relatively. But, note that, besides what I report below, I did have one 343 HP "pre" reading. Also, the current HP readings are on a 40 degree morning. In this regard, the 20.01.00 car seems to come on strongly from 70 to 80.

Fourth, in today's tests, I had some wheel spin. Once the spin was great enough that I disticntly saw the lingering effects of DSC and DTC. In this regard, when the "system" senses more wheel spin than it likes, it makes the shift to second at about 6k RPM--which, of course, is wasted effort because the wheel spin ended long ago. My car did the same thing under 19.01.01. However, I don't think that the spin I got today would have caused the early shift with 19.01.01.

Here is the new info. Enjoy. And, chins up. It looks like you need to drive it like you stole it for a while.

P.S. I accidentally omitted the change value for the 1/8th for the new tests.

cattman

Excellent data, I appreciate your efforts, Znod!

I suppose the data offer reasons for optimism, or at least parity, assuming you get to even with the previous software.

However, data is boring compared to the feel of being behind the wheel of a 545.
So how does it FEEL, Znod? Is there still the heaviness/slugishness that I am feeling after only 2 drive cycles after the 20.01 "upgrade"?

grogan545

Starting to look better Znod.Already got .25 sec back on your 0-60.Hopefully you will be back to normal in about a week.I am still going to hold on updating to 20.01.

The 40 degree weather definitley helps on the horsepower so I would temper your better results until you can duplicate your original results under the original weather conditions.

Looking forward to your continuing updates.

znod

Thanks grogan, and right on all counts.

EBMCS03

Phew nice to see its starting to come down...

znod

Fingers crossed. Thanks.

znod

Here is today's update from 3:30 a.m. at 42 degrees. I added tests 3 and 4 to the post 20.01.00 data. The car was a bit slower today, but not noticeably so. I have, as yesterday, some wheel spin back--to the point where I abort some runs. I aborted one run today. The differences on the "zero tos" (e.g., for zero to sixty and the 1/8) are not large, but they still are troubling since I have been testing in slightly cooler weather. Time will tell whether the effects on 20.01.00 will go away completely. Maybe I'll have news from the foreman/engineer by tomorrow or Tuesday.

Looking at differences in the changes ("old" less "new")

70-80 0.129
60-70 -0.034
50-60 -0.068
40-50 -0.020
30-40 -0.046
20-30 -0.002
10-20 -0.030
0-10 0.009

reveals that the major differences favoring the "old" car (i.e., the negative differences) occur between 10 and 20 MPH, 30 and 40 MPH, 50 and 60 MPH, and 60 to 70 MPH. The second and last of these changes occur over speeds at which the Step shifts. So, is worse Step shifting part of the problem?

On the other hand, the most significant difference occurs between 50 and 60 MPH. In this regard, I wonder if the Step is shifting earlier than it should. Without getting into the calculations, the pertinent data are as follows:

Top speed in 1st gear would be 6,350 / 6,500(34.28769707) = 33.49644252
Top speed in 2nd gear would be (6,350 / 6,500)61.10243456 = 59.69237838
Top speed in 3rd gear would be (6,350 / 6,500)94.06559005 = 91.89484566
Top speed in 4th gear would be (6,350 /6,500)125.42078674 = 122.52646089

So, if the Step shifts from second to third at 6,350 RPM, then it would be shifting prior to 60 MPH which would produce an unusual 50 to 60 MPH difference.

Finally, I think that the large positive difference (.129) for 70 to 80 MPG is interesting. If it weren't for this difference the "two" cars would not be nearly so close in the 1/8th and to 80 MPG. I can't explain what is happening here, but similar differences occur across all 4 post 20.01.00 tests. Did the effects of DSC and DTC finally go away after 70 MPH? If these values are to be believed, the new car is very competitive with the old car in getting to 80 MPG.

Any thoughts anyone?

EBMCS03

Wow since it learns like this... I wonder what'll happen when you dont drive it hard for a week... you'll get a slow car again... Sheesh I bet my car is like 0 to 60 in 8 secs by now!