Yesterday, while doing some spirited driving, i had a mis-shift. I wanted to go from gear 3 to 4 but while completing the shift, it didn't follow through. It went into neutral and I stepped on the throttle. The engine revved to 7000-7400 rpm's. I wasn't sure if it was a stage 4 overrev, so called my friends in a local garage and immediately went to read my DME. God's grace no overrev's in range 4. It happened today as well and i am sure it bounced off 7200-7400 again.

Since i am new to the car, the mechanical feel of the short shifter is a little different from the BMW Z4//M i used to drive. Will take some getting used to.I am sure because of yesterday's incident, it wouldn't be anything. My question is, is there a rev limiter that doesn't allow the engine to go into a stage 4 over rev or something like that? I asked my tech what is the over rev range for each gear and he wasn't sure. I see various posts regarding the ranges for each number but can someone tell me exactly what are the over rev ranges? Will accidentally shifting into neutral cause the engine to protect itself by some sort of rev limiter despite throttle input?

Newbie here, so please share your opinions. Any help appreciated.

Thanks,

Mathew

 

I would sell it before your engine explodes.... you probably hurt it doing that and its only a matter of time now especially since its is not the metzger engine that you have.

 

^^ . He has an '09.

To the OP...you'll be fine. Typically range 4 and 5 will happen due to some kind of mechanical over-rev. For example, if you shift from 5th down to 2nd instead of 4th...at a high speed. If you just floored the throttle in neutral the engine has a rev limiter which will stop rpm's before you can cause any damage. I wouldn't worry about it..

 

Some folks are experts. Others are expertz.

 

haha good one!

 

When you accelerate by stepping on the gas, there is a fuel shut off just after to redline. On a 6 speed, redline is 6750 RPM on gears 1-5, and 6800 RPM 6th gear. Fuel shut off is 7000 RPM in all gears. Engine velocity and momentum will cause the revs to climb momentarily - but it is limited.

When you shift 3 to 2 inappropriately, no fuel shut off will save your engine.

 

Thanks Tom

thanks bbywu! So if the rev counter needle goes all the way to 7400 during my accidental neutral shift, it would be just a visual display on the rev counter?

Also picked up rev ranges for 997TT on another forum:

Range 1- 6800-7000
Range 2- 7000-7200
Range 3- 7200-7400
Range 4- 7400-7900
Range 5- 7900-9000
Range 6- 9000++

Is this correct?

 

The needle on the tachometer does not 100% correspond with actual engine speed.

 

So in your experience, is it slower?

 

Looks like your info is correct.

 

thanks a lot!

 

just like the temp gauge!

 

FWIW, I got a few Range 4s just by bouncing off the stock rev limiter at WOT. I do have a tune on my car, but the stock redline was retained.

 

Hans might explode if you don't spell his last name correctly,

 

Glad this got settled. You will be fine, just stay away from 5 to 2 downshifts. That be bad :-)