I have 600miles on my new C4S and have not gone over 4K RPM (maybe to 4500RPM but that's it). While driving around the foothills, I took a corner at 30mph and then blipped the throttle to get to 4K RPM range and the car revved up immediately without engaging the clutch (no sport or sports plus button pressed). The PDK was on "D" and not sure what gear was selected. Tried recreating the scenario again today and it did the same thing... Was cruising around 15mph and turned a corner hard and blipped the throttle to get it to pull out of the corner and again the rev went up to 5Krpm without moving the car fwd... felt like the clutch slipped. Am I locked out of that performance until the break-in is complete or do I have a problem. Any ideas?

Thanks

Ed-

 

Tell us what you mean by "I took a corner at 30 MPH and then blipped the throttle to get it to 4,000 RPMs"?

How are you "blipping" the throttle????

 

While heading into a corner in the foothills around 30mph, i was at 1500 RPM and wanted to pull the car out of the corner more aggressively than I had been doing but trying to stay under 4K rpm so when I pressed the throttle the rev's went up but the car did not pull. This happened again driving around the block when I once again was turning into a tight corner at about 15mph and hit the throttle a bit more aggressively than I have during normal driving and the rev's went up again to 4500RPM but the car did not accelerate. I have been babying the car and have not even used the sports/sports buttons yet. I have stayed under 2K RPM for most of the 600 miles. Is this a Porsche "safe-proof" warning system to not allow the car pull out of corners too aggressively??

Thanks,

Ed-

 

when the throttle is "blipped" the pdk will downshift....i am not sure if that helps...

 

Blipping is the wrong word. I accelerated out of the corner. Sorry... Blipping was wrong.

 

There is no "safe-proof" system. I would take the car to the dealer and show thin what you are encountering.

 

PDK kickdown - I've searched similar issues and the closest thing I found was something called "PDK Kickdown". What do you guys think.. Does this sound right? I truly hope my beauty is not already harmed. I baby the car so much that I can't believe a simple acceleration could already show signs of mechanical error. Feels like my Lotus Esprit ownershiop days all over again.. NOOOOO

 

It sounds like a software glitch to me. I doubt you've done anything wrong, just take it to the dealer and have them fix it.

 

OK, no blipping.

I think it is probably a kickdown, although this is VERY pronounced if you are in Sport Plus and Drive. I haven't noticed it in regular Drive mode. Are you sure you're not in Sports Plus?

BUT, not sure if others will agree, but according to my salesman when My C2S was delivered, although you need to stay under 4,000 RPMS, once the motor is warm you do need to be aggressive. So according to him, babying it at 2,000 RPMs could also lug the engine, very not good the rings and the valves. That's why I'm driving mine in manual and, once warm, aggressively getting it up to 4,000 and then shifting up with the paddles.

Try that, I think this other issue will go away.

 

Thanks.. that sounds right.. I am around 5th-7th gear ranges just cruising along slowly then hit the accelerator while on normal mode. That could be the PDK not allowing the lugging and setting KICKDOWN mode on and causing the car to rev quickly. The only strange part is the feeling like I'm revving while on Neutral. I then let go of the throttle and move along fine after.. Seems like a safety mechanism.

 

If you're cruising along slowly, I wouldn't let it get into 6th or 7th gear during break-in. That just doesn't sound good for the motor to me.

 

Not sure if what you describe is actually the new pdk feature on 911. When cruising, if you press the pedal quickly and then let go, engine will rev match and pdk selects lowest possible gear without accelerating the car. Just like when you double pull downshift lever. If you pull both levers, pdk will stay in neutral until you pull one side again.

 

Any auto transmission does that, it's called kickdown. Isn't the neutral feature of the pdk only for the GT3 when you pull both pedal?

 

Mine may be doing the same thing. If I blip the throttle slightly, it will shift down one or two gears and if I blip the throttle more aggressively it goes down far enough that the engine is revving 5000 RPM or above. If it has gone down to far for my liking, I just manually put it up one gear with the steering wheel controls. It is disconcerting to have it rev up that much and even though I have 5500 miles on the car it still feels uncomfortable to be up at that RPM range without accelerating much. From my aircraft days, we were always taught that RPM rev limits are less with no load on the engine and even though I haven't seen that described for Porsche engines, I still react the same- load the engine.

I'l try to duplicate it and determine if it really is just in first gear revving high or if it has gone to neutral, but I doubt it's gone to neutral.

ChuckJ

 

Fur sure the "kickdown" I'm describing is not on any auto transmission.
On 991 GT3, you pull and hold = neutral, let both go = engage the clutch