Sudden lag during an overtake today. Is this normal?

[snstevens]

I had a reasonable length trip on a range of different roads taking my grandson to be shown around Red Bull Racing by an old colleague and friend (and serial GT3 owner he had picked up his latest touring on Monday) so tried a few things.

Mine definitely "kicks down" when flooring the throttle and I feel it but its nowhere near as slow as a typical auto or manual IC engined car.
It is also nowhere near as bad as the lag of any of the turbo cars I have driven or owned either.

I am so used to (and like) the coast on lift off I didn't like the Sport setting for general use both for that and the markedly poorer ride.
I did try hooliganing around a few corners and roundabouts on low traffic bits and Sport is definitely better for sliding the car, but not by that much, so again, not enough for me to leave it there.

Normal turns out to be a very well judged set of settings for my taste.

The car has great grip and balance!

Very OT!
It is 13 years since I retired from Formula 1 and the rules have changed a lot but I was staggered how many people there are now and how complex that allows them tomake the parts.
Williams GP Engineering was 23 people when I joined and we made the fastest car and won the Championship the following season and started to grow, we were fairly dominant for the next few years and grew to around 100 people before I moved.
Red Bull Racing does do their own power train but they have 1700 people and Mercedes the same.

Going to races to run the car is not quite such a personal experience any more.

Man, I envy you! Lucky dog...

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[tchavei]

Finally figured out what happens. I'm ashame I didn't figure this out earlier but I can't really experiment with wife and kids in the car nor while driving in the city.

Sooo... On a RWD...

Normal mode starts in first gear and goes up to 85km/h at which point it will shift into second. It's very smooth and you only notice it through the slight blip in the blue acceleration meter and, if you have sport sound on, in the change of tone.

So if you're driving at 70km/h and suddently overtake a car, it is instant, smooth and powerful.

HOWEVER

If you're driving at say 90km/h (second gear) and reduce speed to say 60-70km/h, the car KEEPS in second gear. It will only downshift into first at <= 55km/h in "normal" conditions (you can also confirm this by the blip and sports sound).

So now I know exactly how to reproduce the "lag and jolt" every single time. It doesn't really bother me anymore since I know why it's happening and I can't myself figure out any better option for Porsche to implement but thank God I can now sleep in peace again.

So how to reproduce it?

On a RWD (no idea about other trims)

1. accelerate gently until the car shifts into second (90-100km/h is fine).

2. Reduce your speed to 70-75km/h (pretend you just came close to a slower car)

3. Floor the accelerator

Car will "lag" for a split second as it forcefully downshifts into first (because flooring isn't "normal") and then "jolts" as it applies all those KW ?

Actually, I can hear something wounding up like a turbine just before the car shoots forward.

TL;DR

Up shifting occurs at 85km/h
Downshifting occurs at 55km/h

If you upshift and then lower speed to > 55 km/h but < 85km/h you're still in second gear. Flooring (or at least suddently stepping firmly) the pedal will force the car to downshift + accelerate hard which can be perceived as "lag and jolt"

 

[Hirschaj]

Finally figured out what happens. I'm ashame I didn't figure this out earlier but I can't really experiment with wife and kids in the car nor while driving in the city.

Sooo... On a RWD...

Normal mode starts in first gear and goes up to 85km/h at which point it will shift into second. It's very smooth and you only notice it through the slight blip in the blue acceleration meter and, if you have sport sound on, in the change of tone.

So if you're driving at 70km/h and suddently overtake a car, it is instant, smooth and powerful.

HOWEVER

If you're driving at say 90km/h (second gear) and reduce speed to say 60-70km/h, the car KEEPS in second gear. It will only downshift into first at <= 55km/h in "normal" conditions (you can also confirm this by the blip and sports sound).

So now I know exactly how to reproduce the "lag and jolt" every single time. It doesn't really bother me anymore since I know why it's happening and I can't myself figure out any better option for Porsche to implement but thank God I can now sleep in peace again.

So how to reproduce it?

On a RWD (no idea about other trims)

1. accelerate gently until the car shifts into second (90-100km/h is fine).

2. Reduce your speed to 70-75km/h (pretend you just came close to a slower car)

3. Floor the accelerator

Car will "lag" for a split second as it forcefully downshifts into first (because flooring isn't "normal") and then "jolts" as it applies all those KW ?

Actually, I can hear something wounding up like a turbine just before the car shoots forward.

TL;DR

Up shifting occurs at 85km/h
Downshifting occurs at 55km/h

If you upshift and then lower speed to > 55 km/h but < 85km/h you're still in second gear. Flooring (or at least suddently stepping firmly) the pedal will force the car to downshift + accelerate hard which can be perceived as "lag and jolt"

See post #2 in this thread Happy to hear that you have the details all sorted.

 

[tchavei]

See post #2 in this thread Happy to hear that you have the details all sorted.

Yeah but I was missing the "WHY?"

But yes, downshift and kick in the back. Wife hates it. "I married a kid", "You driving this like a go kart" and "with you it's either 8 or 80" ???

 

[Hirschaj]

Wife hates it. "I married a kid", "You driving this like a go kart"

Great complements from the wife!

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