Jean

Is there a way to tell whether the previous owner of my car ('94 turbo 3.6) has removed the rev limiter, or maybe modified it? Drove it very hard yesterday keeping up with a couple of 996 TT and GT2s, for 2-3 hours at speeds from 100 to 250 kmph (in the desert) and not once I felt the rev limiter kicking. In the 993TT I get there anytime. I have seen 7000 RPMs a couple of times waiting for the fuel cut-off and decided to pull back to avoid any damage <img border="0" alt="[nono]" title="" src="graemlins/nono.gif" /> . Car has a 1 Bar boost spring and Group B camshafts if it says anything, any help is greatly appreciated.
Thanks

PorschePhD

Jean,
The rev limiter is built into the EZ control which is actually a digital ignition in the 3.6T. The EZ can not be modified as it is a seal unit. It is a possibility that your tach is off. How high were you taking it?

Ian964

How does your 3.6 Turbo have 4WD?

Sameer

Jean,
If I'm not wrong, the rev hard cut is at 7200 revs. Did you manage to give the 996TT a hard fight and keep up with the GT2?? Tell us more.

Ian964

I've readlines my C2T a few times, I dunno how different the 3.6 is. But its pretty violent when the fuel cuts off. I though I had ran over something before I realized that I forgot to shift into 3rd

KeithC2Turto

Rev limit on C2T's is 6750 +/- 50 rpm.

On mine it just cuts out.

Do you have a distributor with 6 spark wires in place?

If so you should cut out near 6800 rpm. If not, someone has modified your ignition system (twin plug?).

As Stephen said, there is not way to modify the spark cut out on a C2T ignition system.

I belive it does not cut fuel is just stops the spark.

Keith

Jean

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by PorschePhD:
<strong>Jean,
It is a possibility that your tach is off. How high were you taking it?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Stephen, I am quite sure that I saw 7000 a couple of times, but not above. If you say that it cannot be modified, I will then take a shot a trying it today again on 2nd gear.

Sameer, we were behind each other but I was keeping up with 996TT easily. It was chipped. The GT2 had tremendous low end acceleration, then I got closer at higher RPMs

Ian, my car has the 993TT gearbox and transmission

Keith it does have the distributor in place, but I am confused now , is the rev limiter set at 6750 or 7200 ?

Thank you all.
Jean

fc-racer

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by PorschePhD:
<strong>Jean,
The rev limiter is built into the EZ control which is actually a digital ignition in the 3.6T. The EZ can not be modified as it is a seal unit. It is a possibility that your tach is off. How high were you taking it?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Is there any plug and play aftermarket ignitions that make the rev limiter softer than the facotry hard cut? Something like an MSD rev limiter, etc? I hate driving hard in the rain with this car because if the wheels spin and it revs up to the limiter, the violent shut off is scary!

fc-racer

jrogers

Jean,

It's your car, but I would question the logic on reving it higher in second just to see if the rev limiter is working. One of the mods that people do is to go to stiffer springs and titanium retainers to allow higher revs. If you are stock in this area, and your rev limiter is not working, you might be getting into some ugly repairs if a valve and a piston meet.

I would consider finding someone to test and calibrate your tach, and if it turns out to be accurate, do some electronics testing and debugging on your rev limiter, instead of just spinning it higher to see if it works.

Spinning a motor at real high revs is a good way to shorten it's life. I would think that 3.6 would make enough power 'down low' where you could comfortably shift by 6500rpm.

Jean

Jim,

I agree with you, that is why I was reluctant to test it, but I think it was very important to know whether I do have it or not in a car revving so fast, and unfortunately where I live now technical know-how is very limited and I need to test myself.

And I did, yesterday, shifting to second gear and watching very closely the needle not to let it climb too far..at around 7200 RPM (definitely after 7000), it did cut off, very violently, nothing similar to the 993TT. Since I had been used to the 6750 rpm limiter on the 993, I never dared taking the 965 beyond 7000, but I am relieved now.

One more question to you gentlemen. After this brief test, (redlined from 1st. to 3rd.gear) 20 seconds later, at idle on a red light, there was considerable smoke that I saw on my rearview mirror coming out of the exhaust, not sure about the colour as it was dark, but later the smoke disappeared when I started driving again, any clues what might have caused this? I sometimes see it in the morning as well at startup for a few seconds.

Thank you all for your help.
Jean

fc-racer

My C2 Turbo will smoke from somewhere in the rear right when I overfill the oil. I've had this happen twice, once it was the shop's fault, once it was my fault (when I first got the car). I also noticed my friend's 993 Turbo do this so there must be a pressure vent somewhere there to prevent the excess oil from causing damage. I'm not sure if that's where yours is coming from since you specified it came from the exhaust.

When I overfill, the smoke comes from the rear passenger wheelwell.

fc-racer

Gordon,

Isn't that rev limiter the worst thing you've ever felt!!!

Jean

fc-racer

The smoke came out of the exhaust, although it was dark, I think it was coming out of both sides of the car. I am taking it today to the only (and lousy) Porsche dealer here. I have run a few searches on the board and will tell them what to check. I hope nothing serious.

Thanks. Jean