grogan545

Hi cobradave.Great runs but I am puzzeled by the large discrepancy in speeds both at the 1/8 and the 1/4 between the runs.It appears you might still have a calibration problem with the Pro RR.It would usually take a very significant event to cause that big of a difference between runs.

cobradav

I do get pretty wide variations that I can tell even from my butt dyno. Not sure if its because I am not focused or, am still trying to find best set up combination or just exactly what. I can tell when it has really hooked up and I am going to get a low 13 and 110+ speed. I think the meter is seeing what is happening accurately.

znod

Hi Guys:

I found 1 Steptronic 645ci test and 1 SMG (or manual--couldn't tell which) 645ci test on BMW--Germany. cd, if you want, you can use your Pro RR data to find the your values for the zero to xxx kph values given below for comparative purposes. I expect your times to be considerable better, but I am not sure how much better they are likely to be. Here is the magazine info.

..........Title of Article....................Type of Test.........Magazine Name........Test Date........Tranny
Neue Energie auf Startposition...........Test.................AUTO ZEITUNG.........27/2004..........Step
Angriff aus dem S?den................Vergleichstest.........AUTO ZEITUNG.........01/2004......SMG or Man

Below are the data, from the two articles, respectively. I don't believe that the Step is really slower--especially when it tied with the SMG/Man on 0-40 kph.

00-40 kph.....1.9.....1.9
00-60 kph.....3.2.....3.0
00-80 kph.....4.9.....4.5
0-100 kph.....6.9.....6.0
0-120 kph.....9.5.....8.1
0-140 kph....12.4
0-160 kph....16.2
0-180 kph....20.8
0-200 kph....26.4

cobradav

I do not know how they are measuring, but I cannot believe those figures for a 645. Seem incredibly slow more like a 630i. All my data is in MPH so I converted to equivalent kpg. Can only get an exact match at the 50 and 100 MPH points, but it is surely obvious that this magazine are out of whack with real life. Could they have forced a specific gear or set of gears? I can't get mine to go that slow, even without trying to test for fastest 0-60 or 1/4 mile times.

znod

Right, I wonder about the mag numbers too. The data for the Step seem especially questionable. Those for the SMG seem better given the 550i data below (i.e., the 550i seems to be fast IMO). Did you know that you can read the mph eqivalent of the various standard kph values from the Pro RR data after using "Export Main Run" under the file menu? Also, I am sure your are aware, but the time difference even for 0 to 100 versus 0 to 0-99.42 (160 kph) is pretty significant. My unadjusted best for this difference is .154. Another example is that my best unadjusted time for 60 mph to 62.14 (100 kph) is .393. So, in thinking about the quality of the mag results it is important to be cognizant of such values--which also can be obtained using "Export Main Run."

Below are some data I have posted before (a tiny bit different now) which might provide some perspective on the accuracy of the mag data. The values for the 550i on the left also come from a test produced by Auto Zeitung. The 550i seems fast. Recall that BMW USA shows 5.4/5.5 for zero to 60 for the car. But, the one tested does zero to 62.14 in 5.5. The values on the right below are from my 5 best adjusted passes.

Both Steptronics:
.................................................. .........Best 5--Adjusted
0 to:...........0 to:...............550i..................Znod's Avg
40k.........24.85m...............1.6.............. .........1.32
60k.........37.28m...............2.8.............. .........2.54
80k.........49.71m................4.1............. .........3.80
100k.......62.14m...............5.5............... ........5.37
120k.......74.57m...............7.5............... ........7.27
140k.......86.99m...............9.6............... ........9.31
160k.......99.42m.............12.4................ .....11.95

cobradav

I was using data I happened to have in my spreadsheets. I see NOW, it is easy enough to switch to metric within PASS, but exporting gets soooo much data that I will have to play with it to see just how much fun I can have. Meanwhile I'll redo my chart in metric with three or so runs retyping it from the PASS data.

From what I see these mag test are really hurting in the 140 kph and above speeds. Really need to know their testing methods.

znod

Hi cd:

I quess we learned something from each other. I had never tried changing to metric in pass. Doing so is cool; I tried it. Thanks. Have fun with all the data from "Export." That's where I got my data for analyzing optimal shift points, etc., etc., etc.

Bimmer32

I think I have asked this before, but has anyone been able to get wheel spin with dunlop RF and everything stock on sport package (545i)? I've put in DS and turned off DTC and DSC and no break torque. No wheel spin on dry concrete. If I want wheel spin, what must I do? Please advise.

grogan545

Your runflats are heavy and may prevent wheelspin because of the unsprung weight.Try light brake torque to about 800 rpm,let off the brake and nail the throttle to the floor.This should give some wheelspin.I have Goodyear RSA,not run flats and if i do this method I get instant uncontrollable wheelspin.Also it is harder to get wheelspin in hot weather.Combination of stickier tires and power loss will prevent wheelspin.

Bimmer32

Do you know how much more weights are the runflats compared to normal tires (per tire)? I tried brake torque to 1200 or so rpm, but the car seems to not have torque until about 3000K rpm. Yes, the weather was about 90 F (hot).