Top Gun Run... 1 mile top speed run. E93 M3 RS46

[Definitive]

b) The factory speedo in our M3's are 6-10% off ON PURPOSE. (intentional error set by BMW)

Thats crazy, so if Im calculating correctly that would mean that at 178mph on the speedo would be 160.8 in reality? Which would mean that I guess I was probably actually hitting the limiter...

I wonder with cars like ferrari's if the speedos are more accurate. We've gone 178 in our F430 spider as well, and the nav actually read about 1mph off.

D

[powerplay]

I was running into the limiter at 176 shown so the 161 mph should be correct

[JCtx]

Originally Posted by immiketoo

There is no electronic limiter on the M3

There is. Non-M BMWs are limited to 250 kph (155) and M cars to 275 (171).
And federal law prohibits speedos less than 0% pessimistic and more than 5% optimistic, by the way, but they rarely are that off on cars (motorcycles are usually off by that much in my experience). Good day.

[Jonmartin]

Originally Posted by immiketoo

There is no electronic limiter on the M3

Yes there is. According to the BMW USA website it is set at 155mph.

http://www.bmwusa.com/Standard/Conte...fications.aspx

Of course it can be easily turned off through a software tune.

[Jonmartin]

Originally Posted by JMD0977

I don't know. I do know that a twin turbo Gallardo hit 189.5mph. There were some GT40's, Viper's etc, but don't know their numbers.

189mph seems hella low for a 1 mile run in a TT Gallardo last month there was one that ran 241mph I believe it had 1,300whp.

Originally Posted by JMD0977

A while ago, I came across a list on 1 mile top speed results of different car here in the U.S. I found one list of some results in Moscow today, but can anybody provide a link to any recent results in the U.S.? Thanks.

Here is a list of results from 6speedonline

http://www.6speedonline.com/forums/9...mile-list.html

"For the sake of comparison, here are the times for some stock cars:

184 - ZR1
171 - C6 Z06
171 - 997TT
165 - 996TT (K16s)
155 - Carrera S

Porsches:

231.4 - joetwint / 996TT
221.2 - art4iza / 996TT
204.0 - topgun / 996TT
201.5 - KPG / 996TT
200.9 - bmoores / 996TT
198.4 - Mbailey / 996TT
197.1 - vividracingTX / 996TT
196.7 - Todd Z / 997TT
195.4 - vividracing / 997TT
195.0 - ttboost / 996TT
191.8 - Todd Z / 997TT
191.6 - AMS / 996TT (K16's)
190.7 - woodtster / 996TT

6speed member's other cars:

246.2 - Boost Logic / 1,300+ rwhp Supra
226.2 - jbsteven / 994 rwhp SC&TT Ford GT
189.9 - AtomicZ / 580 rwhp N/A C6 Z06
185.3 - Hennessyperformance / 650 rwhp Cadillac CTS-V
181.7 - houstonT / 560 whp GTR

[cpiguy]

Originally Posted by Definitive

Thats crazy, so if Im calculating correctly that would mean that at 178mph on the speedo would be 160.8 in reality? Which would mean that I guess I was probably actually hitting the limiter...

I wonder with cars like ferrari's if the speedos are more accurate. We've gone 178 in our F430 spider as well, and the nav actually read about 1mph off.

D

I've actually run a Garmin GPS in my M6 and F430, and I consistantly see a 3% discrepency across the board, up to about 100mph. I don't know what happens as you approach 150mph and above. The discrepency % may increase.

[J08M3]

what is worse than the speedo being slightly generous is the odometer being equally as generous! I could care less about a couple MPH difference, but over the life of the car I really don't want extra miles on it when it comes time for resale!

[cpiguy]

Originally Posted by J08M3

what is worse than the speedo being slightly generous is the odometer being equally as generous! I could care less about a couple MPH difference, but over the life of the car I really don't want extra miles on it when it comes time for resale!

Couldn't agree more!!!

[OC ///M]

Originally Posted by yellowstone

I was also curious and came across this article.

http://www.caranddriver.com/features...andal!-feature

Nice find yellowstone. Thanks for posting.

[Lemans_Blue_M]

Originally Posted by J08M3

what is worse than the speedo being slightly generous is the odometer being equally as generous! I could care less about a couple MPH difference, but over the life of the car I really don't want extra miles on it when it comes time for resale!

The speedo is calculated by a pre-set software algorithm programmed into the Siemens ECU by the BMW engineers. They do this as a safety precaution. (and to minimize the chances of a wrongful death lawsuit)

This programming tweak is designed to insure that your indicated speed always reads higher than your actual speed. (approx. 5-7% more optimistic)

In addition to this...

You also have to factor in the 'normal' speedometer error you already have with instruments of this type...and the combined "stacked tolerances" can give you a total speedometer error of close to 10% on some models. (this percentage varies from car to car)

But the good news is..

The Odometer reading is not a contrived number that is manipulated by the ECU software.

This value is calculated in an entirely different manner.

Our cars total mileage is precisely calculated from the very accurate revolutions per mile readings obtained from our wheel speed sensors.

So there is no need to worry about disproportionately high "excessive mileage" readings in regards to the Odometer.

[Dascamel]

Originally Posted by mrtm2008

Stock Limiter on our E9x M3s are at 161 mph!

...It is 155 mph for E46 M3s

+1


I peaked at 170 mph on the speedo with an actual speed of 160-161 mph. Power did cut at that speed, the car was still pulling up to the limiter.

[SGC001]

Originally Posted by JMD0977

Today I attended the Top Gun Run that was organized today in Miami. I got there around 1:30 pm. There were some very nice cars and also some members from this forum. I did about 5 runs. The highest top speed I reached within the 1 mile was 167.171. I think it could have been better with new rear tires as the ones I have now were almost gone before I got there (1/6 depth of a penny or less). It was fun though. A modified GTR hit 177mph.

I saw your car run. Very strong.

I was driving the silver Mercedes CL65.

I also made some passes in the silver C63 from Renntech.

[JMD0977]

Originally Posted by SGC001

I saw your car run. Very strong.

I was driving the silver Mercedes CL65.

I also made some passes in the silver C63 from Renntech.

I think I missed the CL65 but the C63 was real nice. It sounded real good too. Do you know how much power its putting down and what was your best time? I know it had one run @ 169.x mph, right?

[Gyoung]

great!!

[SGC001]

Originally Posted by JMD0977

I think I missed the CL65 but the C63 was real nice. It sounded real good too. Do you know how much power its putting down and what was your best time? I know it had one run @ 169.x mph, right?

Thanks. C63 is putting down about 490 to wheels. Renntech headers, mid pipe, airbox and tune. Went 169 with C63 on first run feeling out track since I missed the parade lap. Car got progressively faster. Best run of day was 176. It went 173 a couple of times as well as 175. First run was the only one in the 160s. Made about 8 passes.

Ran the CL65 three times. Two at almost 184 and last one was 185. I think I shocked a few people since some modified Ford GTs and Porsche Turbos were running in that vicinity. I was a little surprised myself.

CL65 has Renntech ECU, Airbox, and limited slip diff. Stock exhaust and stock turbos. Puts down a little over 600 to wheels.

Ran my M5 at last event out there, but heard their timing devices were a little screwed up. In any event, M5 went just shy of 170 on their radar.


By the way, your car sounded amazing and you should be very proud. Your car ran faster than alot of Vipers and Corvettes. I don't think the Ferrari F40 hit 170.

[JMD0977]

Originally Posted by SGC001

Thanks. C63 is putting down about 490 to wheels. Renntech headers, mid pipe, airbox and tune. Went 169 with C63 on first run feeling out track since I missed the parade lap. Car got progressively faster. Best run of day was 176. It went 173 a couple of times as well as 175. First run was the only one in the 160s. Made about 8 passes.

Ran the CL65 three times. Two at almost 184 and last on was 185. I think I shocked a few people since some modified Ford GTs and Porsche Turbos were running in that vicinity. I was a little surprised myself.

CL65 has Renntech ECU, Airbox, and limited slip diff. Stock exhaust and stock turbos. Puts down a little over 600 to wheels.

Ran my M5 at last event out there, but heard their timing devices were a little screwed up. In any event, M5 went just shy of 170 on their radar.


By the way, you car sounded amazing and you should be very proud. Your car ran faster than alot of Vipers and Corvettes. I don't think the Ferrari F40 hit 170.

Thanks. I wounder how much faster my car would have been if it was a coupe or sedan (minus 400lbs). I still have room to improve some things on my car though
I had 1 run in which the timing devices didnt read one of my runs.

Next time, I'll definitely get there earlier.

Those are some impressive numbers for your MBs, especially on the CL65

[J08M3]

Originally Posted by Lemans_Blue_M

The speedo is calculated by a pre-set software algorithm programmed into the Siemens ECU by the BMW engineers. They do this as a safety precaution. (and to minimize the chances of a wrongful death lawsuit)

This programming tweak is designed to insure that your indicated speed always reads higher than your actual speed. (approx. 5-7% more optimistic)

In addition to this...

You also have to factor in the 'normal' speedometer error you already have with instruments of this type...and the combined "stacked tolerances" can give you a total speedometer error of close to 10% on some models. (this percentage varies from car to car)

But the good news is..

The Odometer reading is not a contrived number that is manipulated by the ECU software.

This value is calculated in an entirely different manner.

Our cars total mileage is precisely calculated from the very accurate revolutions per mile readings obtained from our wheel speed sensors.

So there is no need to worry about disproportionately high "excessive mileage" readings in regards to the Odometer.

This is good news