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981 2.7 hesitation @ 2000rpm

Tom__P

Tom__P

PCGB Member
Hi guys and gals,
I'm looking for some reassurance from the 981 owners please.
I've had my 981 for around 18 months now and love it, but notice its always had a hesitation under light acceleration at 2000 rpm. Is this simple a valve/gearing shift?
Has anyone else noticed it?
Thanks,
Tom
 
Tom,

Modern engines and auto transmissions are set up to minimise emissions and maximise fuel economy, which can introduce engine flat-spots, so it's possible that your engine is falling foul of this.

Porsche's DME controlled Variocam Plus variable valve timing and lift system operates over a wide engine speed range, so it's possible that the hesitation you're experiencing could be due to Variocam Plus operation. I think the only way to ensure that it's functioning correctly is to get a comprehensive diagnostic check using a PIWIS tester or a similar Porsche-compatible system.

Jeff
 
Hi Guys,
Thanks for your feedback. I think it could be a case of me just being over sensitive but its definitely there.
Its a Manual btw.
Cheers,
Tom
 
Tom,

Just a thought but I think that your 981 has Sport button which changes the throttle to a more aggressive map when selected. If so, do you still get the 2,000 rpm hesitancy when in Sport mode?

Jeff
 
Geoff your correct a 981 2.7 does have a sport button
Take it your using the higher octane fuels does give a tad more response.
Enjoy.[;)]
 
Hi Jeff,
I will have a play with the Sport button on the way home this eve and see if i still get the hesitation.....
Cheers,

Tom
 
Bloody hell its cold today!!!!!
So, taking on your advice and suggestions, and having carried out a thorough scientific review, the likes of which a Bosch emissions engineer would be proud off, of my question regarding the hesitation on my 981 2.7 manual. Having put it into sport mode it goes away which leads me to think its nothing serious....
I would be interested to know if anyone else with the same spec as mine has noticed anything similar though.
Thank you for all of your feedback.
Tom
 
It certainly is Tom. A bit slip-slidey out there, and not ideal weather for Porsches fitted with big, wide summer tyres.!

From memory, I think that the more aggressive Sport throttle map gives roughly twice the throttle opening for a given throttle pedal movement, so you could try consciously giving it a bit more welly at low speed in standard mode to see if that makes any difference. Maybe it's a just a combination of low speed engine/throttle mapping and your driving style?

Incidentally, my 987.2 CS has the Sport Chrono option which includes the throttle mapping and also a more aggressive engine map, but I don't know if the latter is included in the standard Sport option on your 981. If it does then the combination of the two could also account for the removal of the 2,000 rpm flat-spot when you select Sport mode. Personally, I prefer the more relaxed standard throttle mapping for general driving and only use Sport mode for track driving and the occasional traffic-free back-road blast.

Jeff
 
Hi Tom

I have had my 2.7 since new and have never experienced the flat spot you describe.
I would get a PWIS check done that should identify the problem you have.
Hopefully it will be something simple and inexpensive. Fingers crossed.
 
It's a VW/Porsche CO2 hack

that's all and you should not see it in real life as you should not be at 2k !!!

Cayman R does it also, a few people moan, but again don't lug the engine !!
 
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