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The Official G-Meter Testing Thread

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Old 02-10-2006, 06:51 PM
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Originally Posted by cobradav' post='238175
Do you think the RPMs were correct on runs 1 and 3? Did your calibrated eye agree? If not Gtech suggests using higher RPM for the cal mode.
It looks like you are interpreting colums A, B, and C as the results of different runs. But, if so, then that's not the idea. Columns A, B, and C have to do with different interpretations of the same run.

Originally Posted by cobradav' post='238175' date='Feb 10 2006, 09:15 PM
I am beat after doing about 4 hours of deck washing and more to do tomorrow. But I WILL get some runs in tomorrow, I WILL get some runs in tomorrow, I WILL get some runs in tomorrow.
Swab that deck, and yo ho. Great about tomorrow; I am eager to see some data from you.
Old 02-10-2006, 07:32 PM
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Originally Posted by Bokke' post='238182' date='Feb 10 2006, 09:37 PM
znod - did your 2nd worst 60 foot time produce your best 0-60 time? How do you explain that?

I am hoping to try some runs tomorrow.....
It was third worst I think. But, regardless, I noticed that it wasn't very good, and I was surprised. The run felt good off the line. I may have had just enough wheel spin to slow me a bit at the outset, but then to send me off like a bullet later. And, sometimes, I think the GT2 gives some 0 to 10 values that seem too low. And, you can't always reconcile everything. I'll be looking forward to your new data.
Old 02-10-2006, 08:01 PM
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Originally Posted by grogan545' post='238200
1-It apears your GT2 has been giving you slower times and especially slower speeds after 40 mph.This accounts for some of the differences in our compared times when your car was running well.Times up to 40 seem very close to the Pro RR.
Yes, I noticed exactly the same thing.

Originally Posted by grogan545' post='238200
3-As we discussed earlier your car may be shifting to second before 60 mph which will slow your 0-60 time.I think the Pro RR verifies that.Your 0-30 times are all in first gear.
I am thinking exactly the same things. But, if the Step was shifting the way it used to, then this problem probably wouldn't exist--although it might have existed without me knowing and, thus, explain some 0 - 60 variability. I am going to see if I can get the Step to hold second longer by holding forward on my next attempt.

Originally Posted by grogan545' post='238200
I am still trying to justify in my mind how my car with controls on and in D is faster than all my skills(HA HA)and experience can muster.Of course I got to thinking earlier when I said that that drag racers now believe that 0 wheelspin is the fast way down a 1/4 mile.I could never get 0 wheelspin with controls off.With a lot of practice and patience with the controls on I think is the best way to go.If it works for my car it must be possible with others as well.When you get the start right with this method you can feel the difference.I am sure I wil go under 5 sec's with this method in fact I think I already have.
I am not sure why it is working for you. My quess is that it works for you simply because you sometimes hit a "sweet spot" such that you would have broken loose moderately, but the DSC/DTC does just enough to keep you from breaking loose without retarding HP. But, maybe I am just stating the obvious. I don't think the technique will work if one can't break the car loose pretty well.

Originally Posted by grogan545' post='238200' date='Feb 10 2006, 10:35 PM
Are you still going to remove your exhaust & throttle body next week?I think it is a good idea,you have to start somewhere.Good luck and keep us informed.
Yes. They both are coming off on Tuesday.
Old 02-10-2006, 08:11 PM
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Originally Posted by grogan545' post='237635
After analyzing the HP #'s I realized that the peak HP is usually about 57mph.If I calculate the rpm's in Second gear this equates close to the BMW HP peak of 6100 rpm.

I did check the speeds where my car starts to shift.First at 29 mph,second at 60mph.Slightley different then yours but you have shorter tires.
Thanks again for checking the shift points.

Originally Posted by grogan545' post='237635
With your car back to stock it will be a good starting point.My car is stock and I never have been a believer in some cars of the same make & model being significantly faster than another.There is always a reason why one car performs better than another.With all parameters being equal they will perform equal.

Keep the faith and keep me informed.
I am happy. No problems. It all will work out. I like solving problems. Thank you for your support.
Old 02-10-2006, 08:32 PM
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Originally Posted by grogan545' post='238200' date='Feb 10 2006, 10:35 PM
These alternatives yield columns A, B, and C:

................................A.............B... .........C
Shift Points:
1st to 2nd--
RPM........................6,264......5,358......6,264
Time.......................1.77s.......1.77s...... 2.350
Speed......... ..........30.130.....30.130....35.090
2nd to 3rd--
RPM.......................6,216.......6,090......6,216
Time.....................5.266s.....5.266s.....5.5 30s
Speed..................59.840......59.840....61.16 0
3rd to 4th--
RPM.......................6,224.......5,147......6 ,224
Time...................11.839s....11.839s......11. 4s
Speed..................95.370......95.370....93.74 0

2-Looking at your shift mph/rpm it is apparant that some of the data is not correct with the Pro RR.I agree with you that column A looks like the most correct.You can corraborate all data in column A in either B or C at every point.
Wanna see something interesting g-man? I am too tired to be thinking about this now. But, do you recall the values in purple below? They are the values at which I concluded that my step is starting my 1-2 and 2-3 shifts. Notice how they relate to the values in orange above. They are pretty close. I am trying to work out in my head whether, the Pro RR could be picking up starting shift points in one place and ending shift points in another. I am going to bed now, but how about thinking with me on this issue. I am gong to sleep on it, and I am sure I'll have the answer in the moning.

(5,346 / 6,500(34.28769707) = 28.20
(6,158 / 6,500)61.10243456 = 57.89

And, what is the Step doing between the RPM at which it starts to shift and the RPM at which it ends a shift? Are RPM's increasing in between? Staying the same? Decreasing? I would hope somehow that the answer is increasing.
Old 02-11-2006, 03:40 AM
  #66  
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Originally Posted by Znod' post='238209
Couple of things - Well run 2 is an obvious out lyer and just maybe should be discarded; BMWs supposedly are difficult to pick up RPM (reported on their forum) which may contribute to this. Gtech recommends trying to turn on some electrical devices to help in this regard such as the fan, headlights, etc.
I am not sure what you mean about discarding run two--which is an outlier.

Originally Posted by cobradav' post='238175' date='Feb 10 2006, 09:15 PM
Do you think the RPMs were correct on runs 1 and 3? Did your calibrated eye agree? If not Gtech suggests using higher RPM for the cal mode.
It looks like you are interpreting colums A, B, and C as the results of different runs. But, if so, then that's not the idea. Columns A, B, and C have to do with different interpretations of the same run.

[/quote]

Yep, I interpreted the data incorrectly. I'll have to watch that my self. There are some tools about for editing Pass data and for entering into Excel for further analysis. Obviously I have not tried them yet, but hope to soon.

Some links to these here:

http://www.reasontech.net/PASSedit/

http://members.chello.nl/~r.herweyer/
Old 02-11-2006, 03:41 AM
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Originally Posted by Znod' post='238244
Well Znod your mood seems to have improved as well as your times.You have some very interesting data from the Pro RR.I haven't spent a lot of time digesting all the data but here are my initial thoughts:C
Hi g-man. Opps, I though I was replying to cobradav about the snow. I know that you don't need anything more to do that is test related. But, thanks for trying to answer below.

Originally Posted by grogan545' post='238200
2-Looking at your shift mph/rpm it is apparant that some of the data is not correct with the Pro RR.I agree with you that column A looks like the most correct.You can corraborate all data in column A in either B or C at every point.
I agree. Sorry for imposing this burden on you. As mentioned, I thought I was replying to cobradav.

Originally Posted by grogan545' post='238200
4-Due to the difference in tire size between our cars using the same rpm as you noted in column A my speed would be 60.30 mph with the shift from 2 to 3.The best possible senario for good 0-60 time.
Right, your tire size might do the trick consistently for you.

Originally Posted by grogan545' post='238200
Are you still going to remove your exhaust & throttle body next week?I think it is a good idea,you have to start somewhere.Good luck and keep us informed.
Yes. They both are coming off on Tuesday.
[/quote]

Not a burden at all Z-man,I like analyziing data and looking for answers to problems.

Your right about the "sweet spot" and I get more familiar with the start I hope to hit it consistently.You have other problems to contend with now,but once you get your power back I would definitly try my method again.The most difficult step is not getting into the throttle too soon.It sounds easy but when your all "hopped up" to make a speed run it is difficult to control the right foot(speaking for myself).I believe it works best by going to full throttle with steady movement taking about 1 to 1.5 sec's.I tried 6 runs since I started using this method and have hit the "sweet" spot twice.The first time with the results I pm'd to you and the second time was the 5.00 S run.Judging by previous history if I subtract .17 sec from 5.00 I get a 4.83 sec 0-60 in hte N direction(pm data seems more possible now).Two way average of 4.92 sec.

Anxiously looking forward to your results after your remove the modds.
Old 02-11-2006, 03:43 AM
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Originally Posted by cobradav' post='238337' date='Feb 11 2006, 07:40 AM
Great, I'll check them out. Also, look at my last post about possibilities related to columns A, B, and C. Looking forward to your's cobradata.
Old 02-11-2006, 03:53 AM
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Originally Posted by Znod' post='238249
These alternatives yield columns A, B, and C:

................................A.............B... .........C
Shift Points:
1st to 2nd--
RPM........................6,264......5,358......6,264
Time.......................1.77s.......1.77s...... 2.350
Speed......... ..........30.130.....30.130....35.090
2nd to 3rd--
RPM.......................6,216.......6,090......6,216
Time.....................5.266s.....5.266s.....5.5 30s
Speed..................59.840......59.840....61.16 0
3rd to 4th--
RPM.......................6,224.......5,147......6 ,224
Time...................11.839s....11.839s......11. 4s
Speed..................95.370......95.370....93.74 0

2-Looking at your shift mph/rpm it is apparant that some of the data is not correct with the Pro RR.I agree with you that column A looks like the most correct.You can corraborate all data in column A in either B or C at every point.
Wanna see something interesting g-man? I am too tired to be thinking about this now. But, do you recall the values in purple below? They are the values at which I concluded that my step is starting my 1-2 and 2-3 shifts. Notice how they relate to the values in orange above. They are pretty close. I am trying to work out in my head whether, the Pro RR could be picking up starting shift points in one place and ending shift points in another. I am going to bed now, but how about thinking with me on this issue. I am gong to sleep on it, and I am sure I'll have the answer in the moning.

(5,346 / 6,500(34.28769707) = 28.20
(6,158 / 6,500)61.10243456 = 57.89

And, what is the Step doing between the RPM at which it starts to shift and the RPM at which it ends a shift? Are RPM's increasing in between? Staying the same? Decreasing? I would hope somehow that the answer is increasing.
[/quote]

I have noticed at times that the step takes much longer to complete a shift.This could be what happened in the "flukey"data you got on some of your shift's.As we know during a shift the engine controls reduce power to facilitate a "smoother" shift to reduce driveline shock.If the shift starts much earlier say 5147 rpm,the power is reduced for a much longer time period thereby causing poor times.Maybe this is the source of your problem.Your dealer redid the engine map,maybe they should try the trans program.
Old 02-11-2006, 04:04 AM
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Originally Posted by grogan545' post='238200
Not a burden at all Z-man,I like analyziing data and looking for answers to problems.
I believe it works best by going to full throttle with steady movement taking about 1 to 1.5 sec's.I tried 6 runs since I started using this method and have hit the "sweet" spot twice.The first time with the results I pm'd to you and the second time was the 5.00 S run.Judging by previous history if I subtract .17 sec from 5.00 I get a 4.83 sec 0-60 in hte N direction(pm data seems more possible now).Two way average of 4.92 sec.
Good morning. Please see the orange insert above. The calculations don't necessaryily imply anything about your car. But, I wonder if your tire sizes are that different from the stock sport package tires--used in the first two calculations. So, as mentioned, I wonder if your car really is doing all of its shifting after 60 MPH.

And, I know where to find your sweet spot instructions. Thanks. Finally, wow, if what you say holds up, then I will be looking forward to a less than 5 sec. average. Happy snow days.


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