View Full Version : Rev limiter on m42

06-12-2004, 01:30 AM
I hit the rev limiter today on complete accident, I looked down at my tach when I had to accelerate onto freeway speeds and it was going into the red (past the yellow/red zone.) It hit an estimated 6,800 RPM and the engine stopped going any higher and the spark was cut. Curious to know if the rev limiter is electronically controlled or mechanically controlled, also wondering what permenant damage results in this because directly after this, I smelt an awful burning (lean?) type exhaust smell ...

07-23-2004, 02:15 PM
I have the M42 from the E36 in my E30...
from the tacho, it seems like the cut off is about 6700 - 6800rpm...

rev limiter is controlled by the ECU...

Not sure about the damage... but I have done it quite a handful of times especially accelerating in 1st gear....

07-23-2004, 02:27 PM
Sell your car right now, that engine is toast man.

You didn't do any damage at all, that's why it's a limiter.

07-24-2004, 03:09 AM
... of course, the limiter is there. Isn't it possible to seize the engine with ... old bearings? Old engine components?

MR 325
07-24-2004, 04:55 AM
We're not dealing with a 66 bug motor here, you'll be OK.

07-26-2004, 12:21 PM
my m10 has over 300000 miles and I redlined that thing every day twenty times a day, sometimes on purpose.

it runs like hell to this day, but it is out on its on, as the m50 has taken over!