Agro1

I've read a few past threads about bouncing off the rev limiter, and am aware of everything associated... I know it's not a good thing, especially if it happens under load, ie. mechanical over-rev which no limiter can protect you against. My question is this; how tuff are these motors ? Lets take the mechanical over-rev out of the scenario. If you hit the rev limiter with the car in neutral, can it handle it ? I've read the limiter kicks in just over redline (7K). Is the 993 motor stout enough to handle this every once in a while ? Thanks in advance.

jford

Can't answer your question completly but I have bounced off the limiter a few times in both my 993 and 964. This happens to me only at the track. I don't think its that big of a deal. I think the biggest danger to the car is the "money shift" over revving from a missed shift.

Jamie

Agro1

...agree with ya there Jamie. Thanks for the info - nice to know others have done it without incident...

George A

I thought the rev limiter was at 6750 rpm. And yes, I've bounced off of it several times. I try not to make it a habit.

George

Martin S.

Just as we have seen in other Porsche cars, an accidental down shift from 5th to 2nd, is not healthy. I have a friend who did this, spun the motor up to an estimated 10,000 RPM on the Rev charts...needless to say, he has all new exhaust valves. In addition, while the motor was apart, he got new valve guides, and just for insurance, he had the heavy duty valve springs installed.

In the heat of battle, I have bounced off the rev limiter a few times with no apparent ill effects. A BIG shift indicator light would be an excellent way to avoid this. I have a friend with this mod on his 993 TT car. I have been told that this is not easy to wire on the 993 NA car, hmmm, go figure.

Nemick42

Agro,

There is a pretty big difference in bouncing off the limiter under load and under no load. My understanding is that these engines are remarkably stout, so I wouldn't worry too much about the occasional rev limiter occurance, under load. I would advise strongly against hitting the limiter when unloaded, if at al possible.
Just my $0.02

jford

I believe Eric in Chicago had a shift indicator light in his n/a 993. I have given it some thought as well. The added benifit is that you will stay in the power band more effeciantly. That is to say I believe the peak HP is a bit lower than redline. It always takes me a little by suprise when I hit the limiter but I am oh so glad its there.

Jamie

ScottMellor

I feel SO much better.
I thought I was the only one to forget to shift up at the track.

Agro1

Thanks for sharing guys.

Neil - can you pls expand on why hitting the limiter under load is better than bouncing it with no load ?

Martin - MSD makes these cool little gadgets called RPM activated switches. When you hit a predetermined RPM, the switch activates whatever you want, shift light, window, door locks, etc...I agree a shift light would be nice for those fast 2nd gear corners...But the motor slows down towards redline in the higher gears so it's pretty easy to just glance down. A nice BIG red light next to the RPM guage would be cool though...

Thanks again guys - keep it coming. I'd like to hear how many of you have bounced the limiter without incident.

kary993

Agro1,

I have bounced off the rev limiter multiple times over the years. I am not sure whether there is damage or not but the car has been running at tracks (auto-x, DE, and TT) since 1997. Seems pretty tough to me.

Agro1

Good to know, Kary...Thanks dude. That LWF and clutch makes the 993 motor rev like a 351 stroker

mac993

Luke- did you get your car back? How do you like it? Very intrested in the LWF set up as I am very close to doing it. Thanks bro

Agro1

Dan - Yes, I did. I'm gonna start a thread later detailing everything about the car, Hergesheimers, Truspeed, etc...with a couple photos. But in short, it's awesome. Absolutly love it and the LWF is fantastic. I wouldn't say it is for everyone, but if you like to drive, and drive the 993 the way it was designed to be driven, it is great. The power is much better. Getting rid of that heavy DMF just allows the motor to rev very very freely...More to come.

Novice

Ditto what Jamie said, I hit the rev limiter over 4 times in one day (and loving it) in 3rd gear doing probably 100 mph, at Lime rock just last week.
It was very mild and smooth, not a sudden jerk at all unlike some americans I have driven.

Novice

Correct about our rev limited not helping us on downshift mistakes, as shutting off fuel doesn't help.
But in Neutral, as in reving the engine while standing still, it will sense the high RPM and cut fuel ... reducing the rpm.

Oh, but make sure your nitro is turn off :-)