Update on Performance Woes from 20.01.00
02-02-2006, 05:48 PM
#101
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Or start a BEEN KILLED thread LOL SL65 AMG! I WANT THAT CAR!
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Me too. I see we both are very flexible. Z06's, for whatever, as long as it is very fast.
02-02-2006, 06:07 PM
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My Ride: 2008 550I,manufactured 2-27-08,delivered 4-2-08.Platinum bronze,natural brown interior,light poplar trim,cold weather package,heated rear seats,HD radio
On your horsepower issue you must remember that the GT2 derives horsepower from a number of inputs.It is strictly a calculation.Your time to speed is the only the only one that is changing in this equation,as your time increases your horsepower readings will decrease.It can't account for faulty shifts but just see's a slower time therfore you must be developing less horsepower.
Going to do the Z06 now.
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I have read your post#66 again and the only fact not clear to me is how you developed the torque decrease.May be the answer was contained in the attachment you sent to me in the pm.However using the speeds you calculated for 6375 rpm I have calculated the following:
M1-33.629 mph @ 6375 rpm
M2-59.923 mph @ 6375 rpm
33.629/59.923=.5612
.5612X6375=3578 rpm
The rpm at the m1 to m2 shift point is 3578 rpm.the torque peak of a 545 is 3600 rpm.This is almost the perfect shift point(the torque peak).
There is a formula that has been around for many years for calculating horsepower from speed vs time.I am sure this is how the GT2 calculates horsepower.It has no way to actually measure horsepower.
I looked at your post#90 again after you updated.I think it more clearly shows the largest times loses are at the shift points.
02-02-2006, 07:55 PM
#103
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However using the speeds you calculated for 6375 rpm I have calculated the following:
M1-33.629 mph @ 6375 rpm
M2-59.923 mph @ 6375 rpm
33.629/59.923=.5612
.5612X6375=3578 rpm
The rpm at the m1 to m2 shift point is 3578 rpm.the torque peak of a 545 is 3600 rpm.This is almost the perfect shift point(the torque peak).
M1-33.629 mph @ 6375 rpm
M2-59.923 mph @ 6375 rpm
33.629/59.923=.5612
.5612X6375=3578 rpm
The rpm at the m1 to m2 shift point is 3578 rpm.the torque peak of a 545 is 3600 rpm.This is almost the perfect shift point(the torque peak).
(a) the RPM after the first to second shift is 6,500 X 2.34 / 4.17 = 3,648, and
(b) the RPM after the second to third shift is 6,500 X 1.52 / 2.34 = 4,222.
The RPM after the first shift is close to the maximum torque point of 3,600 RPM. But, note that RPM after the second shift, 4,222, is not as close to 3,600 RPM. Nevertheless, these shift points are theoretically optimal because the decreases in torque when shifting from first to second and second to third are smaller than the decreases that occur given any other choice of shift points. At least, these are the implications of the formulation I am using for determing optimal shift points--taken from Lawlor's Auto Math Handbook. Under this formulation, it is not necessarily optimal to shift so that the resulting RPM is at the torque maximum.
So, we don't want the Step to shift at 6,375. If it is doing so, then the torque decrease are too large. And, we may have two factors affecting times and HP's: (1) the Step shifting too soon and (2) the Step shifting lazily.
Two more things. Remember that an actual HP decrease or a problem with DSC/DTC also may be occurring since I can barely spin my wheels any more--even with brake torquing..
Finally, how does your car feel? I hope it is AOK.
02-02-2006, 09:28 PM
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JUst tested 2 times tonite..70 degrees.. Shifted to M1 DSC off... I got the wheels to spin in both runs easily and then the car shifted to second 
seems the rpm hitted the rev limiter and shifted? i also did a little more inspirited driving and the car feels quicker and smoother 
wonder if I got lucky... on thing I noticed is that my mpg is not as good as before (well not because of the hard driving) , i filled up last nite, driving locally and can not get more than 15.3mpg? 
while before i was able to get easily to 17 or 18.. i guess is a trade off with peformance 
seems the rpm hitted the rev limiter and shifted? i also did a little more inspirited driving and the car feels quicker and smoother wonder if I got lucky... on thing I noticed is that my mpg is not as good as before (well not because of the hard driving) , i filled up last nite, driving locally and can not get more than 15.3mpg? while before i was able to get easily to 17 or 18.. i guess is a trade off with peformance
02-03-2006, 05:13 AM
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Originally Posted by Don Juan' post='233963' date='Feb 3 2006, 01:28 AM
JUst tested 2 times tonite..70 degrees.. Shifted to M1 DSC off... I got the wheels to spin in both runs easily and then the car shifted to second seems the rpm hitted the rev limiter and shifted? i also did a little more inspirited driving and the car feels quicker and smoother wonder if I got lucky... on thing I noticed is that my mpg is not as good as before (well not because of the hard driving) , i filled up last nite, driving locally and can not get more than 15.3mpg? while before i was able to get easily to 17 or 18.. i guess is a trade off with peformance
seems the rpm hitted the rev limiter and shifted? i also did a little more inspirited driving and the car feels quicker and smoother wonder if I got lucky... on thing I noticed is that my mpg is not as good as before (well not because of the hard driving) , i filled up last nite, driving locally and can not get more than 15.3mpg? while before i was able to get easily to 17 or 18.. i guess is a trade off with peformance Whay not get a GT2, and join the test thread? Your car seems fast, and you could provide some great data on 550i's.
02-03-2006, 06:10 AM
#106
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Originally Posted by grogan545' post='233890' date='Feb 2 2006, 10:07 PM
I have read your post#66 again and the only fact not clear to me is how you developed the torque decrease.
It dawns on me that the following JPEG might help. It is a graph of the 545i's HP/torque curve--with my conversions to ft. lbs. for pertinent points and identification of these points. Some of the points and converted values will be hard to read--probably. Not all points and converted values I used are identified on the graph--as I recall. Also, I did not spend much time ensuring perfect accuracy when drawing lines, identifying intersections, etc.; small errors in what I was doing would not matter.
02-04-2006, 07:05 AM
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Originally Posted by Znod' post='234627' date='Feb 4 2006, 10:53 AM
grogan. Do you still want to time to distance info?
02-04-2006, 08:41 AM
#109
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Yes Znod I think it might be helpful in determining if times are influenced more by loss of power or slow shifts.
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OK, it will take me a little time to get it done. Today is busy, and I have to find some of my original data. How is your car?????? Great, I hope.
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OK, it will take me a little time to get it done. Today is busy, and I have to find some of my original data. How is your car?????? Great, I hope.
03-07-2006, 10:51 AM
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Hey Don, I learned more from this thread than ever thx 2 all.
Hey Don, I learned more from this thread than ever thx 2 all.