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    Rev-limiter?

    Was hoping from some knowledge from you guys -

    A couple of days ago, I was coming out of a corner and floored the accelerator, and it got stuck to the floor. Needless to say, I was pretty surprised at the car seemingly accelerating by itself, and put it into neutral before shutting off the ignition and coasting to the shoulder. I re-started the car, and it immediately starting revving again, at which point I again turned off the ignition and discovered that the pedal was stuck.

    In all, I'd say my car was in neutral with the accelarator stuck to the floor for about 5-10 seconds. During that time, of course it was revving like crazy, and I think the needle was past redline, near 8000 rpm. I was pretty concerned about permanent damage to the engine, but my dealer just told me that if I didn't notice any problems in the engine or its performance, then to leave it alone.

    I know that the 997 has a built-in rev limiter, but I believe that the limiter only works when the car is in gear? I asked my dealer if the limiter worked when the car was in neutral, and of course they don't know.

    Does anyone know whether or not the limiter works only when the car is in gear? Should I be worried about damage to my engine? I've driven it about 100 miles since then, and haven't noticed any change in the engine, but I'm obviously concerned....

    Thanks.

    Re: Rev-limiter?

    I could be wrong but it is my understanding that the rev limiter is built into the injection therefore its independant on wether its on gear or not, as soon as it detects that the rpms reach the limits it cuts of the injection of fuel repeatedly not allowing it to rev any higher.
    The problem comes when you miss a shift (like in shifting from second to third you instead shift to first for example) and you "force" a higher rpm regime on the engine though an inapropiatedly shorter gear and the rev-limiter cuting the fuel will not help, you wil overrev the engine and you can damage the engine.

    Re: Rev-limiter?

    Not too sure but you've got 4 years of warranty to figure it out. Just keep an eye on things without worrying too much.

    STUCK GAS PEDAL!?

    Did I hear right? You're worried about the rev limiter? That's all well and good: glad there's no damage BUT What did the dealer say about the cause of the stuck pedal?

    I heard our engines are designed to safelyrev to 10K and beyond. It's just that Porsche needs to draw the line somewhere for engineering and warrety issues.

    Re: STUCK GAS PEDAL!?

    Quote:
    MMD said:
    Did I hear right? You're worried about the rev limiter? That's all well and good: glad there's no damage BUT What did the dealer say about the cause of the stuck pedal?

    I heard our engines are designed to safelyrev to 10K and beyond. It's just that Porsche needs to draw the line somewhere for engineering and warrety issues.



    Thanks for the responses. MMD - no, i'm not worried about the rev limiter itself, just whether it was functioning in neutral to protect my engine. just put my car in the shop today - haven't heard back about the pedal.

    when i fully depress it, there is an additional amount of travel if you apply a little more pressure, kind of like how accelerators work in cars with automatic transmissions, although my car is a manual. that's where it seemed to have gotten stuck. hopefully it comes back clean - and also with my Sport Exhaust fully installed

    Re: STUCK GAS PEDAL!?

    Quote:
    Elfer04 said:
    [ that's where it seemed to have gotten stuck. hopefully it comes back clean - and also with my Sport Exhaust fully installed




    Make sure they explain the whole stuck-pedal thing to you and try to read between the lines to ascertain if they fully understood the fix. IOW, it's a potentially extremely serious problem .


     
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