Funny story. A friend of a friend, got an M3 in '98. The guy wasn't an expert at driving stick yet, and tried to race my friend in a Lexus SC400. Anyway, they're on the highway, going about 80-85, and the M3 driver decides to downshift from 5th to 4th. Being a new stick driver, he puts it in 2nd. Needless to say, he overrevved and blew the engine. So he gets it towed to the dealer and the dealer apologizes and says they will fix it under warranty. He get gets a call the next day, and they say that he will have to pay for it since it was his fault. They knew that he was going 83mph in 2nd gear, it was a 5th to 2nd downshift, and that the engine speed was well over redline for a few seconds (before breaking). This amazes me. Do all cars have this capability, or just BMW?

 

BMW ECU's are a lot more complicated than a Max ECU...

 

that's awesome

 

How do you know?

What do they do, specifically, that we don't?

Please back up your assertion.

 

uh oh, someone's getting called out

 

And in the Red corner we have Ben "Moderate with EXTREME prejudice" Garner, Moderatoris Extremis.

And in the Blue corner we have mtrai760, valued member of the .org, claimed holder of valued knowledge.

LET'S GET IT ON!!

 

Read the first post of this thread for more information on one ability we don't have.

Considering that the ECU could record the engine's speed, rpm, and the gear of the transmission, it is not to far fetched to believe it has many other data acquisition and engine control functions that our ECUs do not have and do not need. For more information on this subject, I suggest a good search engine such as www.google.com You could also try searching some BMW forums.

 

Holy carp! That's really funny.

 

sorry for the friend of your friend. they should design something that shutoff the engine or something if rev higher than the redline, well, at least in a BMW. if someone did modify the engine, than someone can hack the ECU of BMW (i'm sure quite a few aftermarket people in europe know how) to reset the redline.
for nissan ECU, we go always ask the guy in JWT and pay couple k. forgot his name though.

 

New Vettes have Hard Drives in them that record whether or not the brakes were pressed before an accident, how fast you were going, whether you turned right or left, and a few other goodies.

Vette owners are up in arms about it, because they consider it an invasion of privacy. A few insurance claims have been denied because of the fact that the ECU told the insurance company something the driver didn't.

I saw it on The Learning Channel, so it must be true

IanS

 

Funny how the way more sophisticated engines are less reliable . . ..

http://members.roadfly.com/jason/frame1.htm

DW

 

 

many GM cars have them. i know someone who was in an accident. his insurance company and lawyer are trying to get evidence from the driver of the GM car because it has an onboard "black box."

 

This is sort on the subject. I was reading this article online that said they are gonna start selling black boxes that parents can use to keep track of how fast their kids are driving. I'm praying it doesn't happen soon.

 

How do I know you ask? Because the software for the BMW ECU reader prints reads a whole crapload of information, including exceeded parameters. Wanna see a pic?
http://members.roadfly.com/jason/DME.jpg

For those that can't read german (myself included, but I have a translater), it says that the revs peaked at 8460rpm for 1 revolution, and was in an over rev state for 13 seconds...

























Why do I know?


Because I want to own an M3 someday...

 

No more comments?

 

That was a certified bish slap from mtrai.....

 

I did this to my GXE when i first got it. I was going somewhere around 80MPH and downshifted to second instead of 4th and let the clutch go. RPMS shot up past 8k... dont remember muchg. After realizing what I had done I pulled over and quickly scanned to check if everything was ok. Things looked good but there was some rattle. I took it in the dealer and they said some nuts were loose and one bolt had fallen out form the exhaust. Other than that I was ok. Its still running smooth and eating up 5.0 Mustang GTs

 

I've redlined in 3rd gear and while shifting into 4th accidentally shifted into 2nd. I've immediately shifted into neutral... within a half second and the revs drop back down and then I get into 4th/5th. For that split second when I'm in 2nd gear at like 90mph, the needle is pinned at 7000RPM... nothing blows. Why would the BMW engine blow? Do they not have a protection like we do? Or what's the deal here?

 

Thiers a big difference going from 5th-2nd, and only going to 7k rpm vs 8500+ rpm.

 

It took him 13 seconds to relize he was in second instead of fourth He definatly deserves to pay for that out of his pocket.

IMHO no one should try any aggressive shifting until they have had time to get used to the car. I made a few mishifts in the first few months I owned my Maxima but they were all at lower RPMs.

 

I've been: