znod

I know what you are saying, but I always figured that there must be some reason for the differences in the circumference-related calcs. and the manufacturer's claims. I thought maybe the latter allowed somehow for actual driving conditions, while the form didn't. What do you think? I have never seen this issue addressed.

znod

Here are the data related to your first point above.

5.27 279.89 59.84 0.271 179.4 154.7 6090
5.28 280.74 59.89 0.269 178.2 153.5 6096
5.29 281.64 59.95 0.267 176.9 152.3 6102
5.3 282.5 60 0.265 175.7 151.1 6108
5.31 283.4 60.06 0.262 174.3 149.7 6114
5.32 284.27 60.1 0.26 173.1 148.6 6119

The data don't quite square up with your thought.

And, another interesting point is that the maximum shift points shown for my car, by the RR, are 6264 for 1st to 2nd (average 6233); 6240 for 2nd to 3rd (average 6228); 6224 for 3rd to 4th (average 6216). If these points are true, then I feel very confident that a torque analysis would show an excessive decrease in torque given where my car shifts versus where your's shifts.

Finally, I am having trouble doing a meaningful torque analysis via the RR. I can get all the torque values I need from the recorded data, but they differ greatly from those the meter yields. And, I can't get complete data from the meter because for some reason it doesn't read-out torque values above 6163 RPM, 6167 RPM, and 6159 RPM for my 3 best runs. A similar problem exists for the lower torque values.

For one more interested in obtaining data from runs, I think the Pro RR is worth the extra price, but its available data leave a great deal to be desired. Its data would be great if they were accurate and always complete across both sources. On the other hand, I really do like having an AC adapter--which also would be a plus on the GT2.

grogan545

I think the posted data proves my point.When using my calculated info for your rpm vs speed I came up with 6216 rpm=59.85 mph.In your column A shift point was 6216rpm and speed was 58.84 mph,almost identical to my calculation.If I apply my calcs to your data in this post I come up with the following:
time.................speed..............rpm
5.27.................59.84..............6216
5.28.................59.89..............6219
5.29.................59.95..............6226
5.30.................60.00..............6230
5.31.................60.06..............6237
5.32.................60.10..............6241
The problem is we don,t know which is incorrect the speeds or the rpm,s.I arbitrarily selected the speeds to be correct and the rpm,s to be incorrect,but it could be the opposite.I am curious as to what Tesla has to say on your data.

znod

Hi:

I just got home from a tiring day, and I am not totally with it. So, I am going to think about what you are saying tomorrow. It's all over my bow right now. And, tomorrow morning is the big morning--off with the B&B and Dinan throttle body. Thanks for thinking about what you are. I am to pooped to pop tonight though.

grogan545

Plenty of time to think about data.The most important thing right now is what changes you observe after removing the throttle body & exhaust modds.We are waiting with baited breath for your update.

Good Luck Zman

znod

It's all done. Results either in Wed., Thur., or Fri. morn. I have "work" tomorrow and dentist appointment Thur. morn. So, I actually may not get to it until Fri. morn. I am looking at the data now.

znod

Hi g-man:

I though about what you were saying. I did some work, and I am not sure that your inference is going to turn out to be general. I've attached a chart showing a number of possibilities that could be correct given that time and speed are correct. I pretty much have to assume that they are correct since they should be the primary outputs of the meter, itself. The chart contrasts what RPM would be assuming time and speed are correct under 3 assumptions: (1) the 6126 value you mentioned is correct, (2) my calculation of RPM, which are based on my calculation of tire diameter, are correct, and (3) my calculations of RPM, which are based on revs per mile of 814, are correct.

Before today, I would have had no insight into which is correct. However, on my way to my dealer, I recalibrated my Pro RR while moving (rather than just reving my engine)--since it is somewhat hard to hold revs constant when the engine is not under load. I found that the meter now is recording values consistent with my car not shifting until about, or a bit above, 6400 RPM--more or less consistently with what my tach is telling me.

So, I am led to believe that (3) gives the best indication of what is going on with my car. I have downloaded the recorded data, and it confirms the higher RPM values although there still are speed/time-related discrepancies. I am not yet sure how the discrepancies compare to before-recalibration runs.

Regardless, if my inference is correct, then the news essentially is good assuming I ultimately regain my lost HP, deal with slow Step shifting, or deal with DSC/DTC not shutting off completely. At least some of the mysteries will be going away if my inference is correct.

Happy thinking.

P.S: I am not sure the the column labeled "Grogan's Calcs ..." ought to be so labeled. I inferred everything but the 6,126 value, and the others values you provided originally, in this column based on proportionality. We seem to be getting slightly different results when calcs about my car are based on its tire diameter.

znod

Hi g-man. I did a relative analysis of our cars before I had my mods removed. So, I'd better get it posted before it becomes completely anachronistic. The tables and a graph are below. The first table should say "Difference in 1/8" rather than "Difference in 1/4."

0700700

once again i have to spend 30 minutes reading this thread

reminds me of a stats lecture...


Anyways as usual Znod, great work , and i got nothing to say as i dont have a 545i , nor do i have cip 20 installed

/ohh and BTW Grogan545 owns you

znod

Thanks for reading 700700, and thanks in general. Yep, the g-man is way ahead now. His car liked 20.01, and mine hated it. I hope my car now, after 20.01, likes not having the mods better than it liked having them.