Banging whilst on full lock

Engine, Exhaust, Drivetrain, ECU Issues and Fixes
coulsda2
Posts: 52
Joined: Sat Jan 02, 2016 9:09 pm

Post by coulsda2 »

My car has always suffered from sideways slip when accelerating forwards out of side roads but ---- recently when reversing or turning in to parking spaces the slip is so great that its like a banging coming through the floor. Does this sound like its soley down to colder tyres and harder rubber or a fault?

User avatar
Miopyk
Posts: 1066
Joined: Sun Feb 02, 2014 2:55 pm
Location: A field somewhere west of London

Post by Miopyk »

We get this in the Cayman but never had it in the Macan. That might be that the Macan is on All Seasons.
Current
  • Guards Red 981 Cayman
    GT Silver 718 Boxster 25
User avatar
Wing Commander
Posts: 19874
Joined: Tue Oct 06, 2015 5:43 pm
Location: Wiltshire

Post by Wing Commander »

coulsda2 wrote: Wed Nov 15, 2017 6:33 pm My car has always suffered from sideways slip when accelerating forwards out of side roads but ---- recently when reversing or turning in to parking spaces the slip is so great that its like a banging coming through the floor. Does this sound like its soley down to colder tyres and harder rubber or a fault?

Have you reported it to the OPC? Maybe show them the issue.

Just lately I have suffered the Ackerman (?) effect. This is common to Porsche sports cars (and other brands probably) in the colder months. It was a tad alarming when I first experienced it in a Boxster, or might have been the 911. Now getting it in the Panamera too. ⛄️
Simon

Sold: 2016 Rhodium Silver Macan 2.0
Sold: 2013 Platinum Silver 911 (991.1) C2
Sold: 2017 Carmine Red Panamera 4
Mine: 991.2 Carrera T Racing Yellow 06/04/2018
jk88
Posts: 315
Joined: Sat Jan 16, 2016 8:30 am
Location: Hants

Post by jk88 »

Wing Commander wrote: Wed Nov 15, 2017 6:44 pm
coulsda2 wrote: Wed Nov 15, 2017 6:33 pm My car has always suffered from sideways slip when accelerating forwards out of side roads but ---- recently when reversing or turning in to parking spaces the slip is so great that its like a banging coming through the floor. Does this sound like its soley down to colder tyres and harder rubber or a fault?

Have you reported it to the OPC? Maybe show them the issue.

Just lately I have suffered the Ackerman (?) effect. This is common to Porsche sports cars (and other brands probably) in the colder months. It was a tad alarming when I first experienced it in a Boxster, or might have been the 911. Now getting it in the Panamera too. ⛄️

What's the Ackerman effect (not heard that term before)?
Macan GTS - Mar 17 to Jan 23
Macan SD - Apr 16 to Mar 17
User avatar
Nuclear Nick
Posts: 3814
Joined: Wed Feb 17, 2016 3:42 pm
Location: Bristol

Post by Nuclear Nick »

It should actually be called the 'lack of Ackermann effect' I think. In 1818 Rudolph Ackermann solved the problem of four-wheel cart steering wheels scrubbing when turning because the two steering wheels need to turn at different speeds aa they are following different radii during the turn. His steering linkage turned the two wheels different amounts to compensate. It's the same reason that a differential is needed on an axle with power being transmitted to both wheels. You get the same scrubbing effect with mechanical diff locks.

Porsche have designed their steering for performance and feel at speed and have chosen not to eliminate the scrubbing on full lock on the sports cars.

If it's happening to such a degree on the Macan I'd get it checked as, unless it's a new car with low miles, it may be a precursor to transfer box failure.
Nick

Defender 90 V8

991.2 C2 GTS

Macan Turbo - sold

BMW K1300S, BMW R1250 GSA
User avatar
Tim92gts
Posts: 624
Joined: Wed Dec 28, 2016 6:01 pm
Location: Essex

Post by Tim92gts »

I've always had it on the 928 in reverse and on the relatively short wheelbase Suzuki it's even worse.
Tim
PP Turbo, LED PTV ACC Pano 20"Macans collected 6th September 2017
1992 928GTS
2003 996 Cab
User avatar
Wing Commander
Posts: 19874
Joined: Tue Oct 06, 2015 5:43 pm
Location: Wiltshire

Post by Wing Commander »

jk88 wrote: Thu Nov 16, 2017 6:48 am
Wing Commander wrote: Wed Nov 15, 2017 6:44 pm
Just lately I have suffered the Ackerman (?) effect. This is common to Porsche sports cars (and other brands probably) in the colder months. It was a tad alarming when I first experienced it in a Boxster, or might have been the 911. Now getting it in the Panamera too. ⛄️

What's the Ackerman effect (not heard that term before)?
[/quote]


What Nick said. :)

Plus, if you Google 'Ackermann Effect Porsche' you'll find lots on it. :geek:
Simon

Sold: 2016 Rhodium Silver Macan 2.0
Sold: 2013 Platinum Silver 911 (991.1) C2
Sold: 2017 Carmine Red Panamera 4
Mine: 991.2 Carrera T Racing Yellow 06/04/2018
coulsda2
Posts: 52
Joined: Sat Jan 02, 2016 9:09 pm

Post by coulsda2 »

Thanks all for your replies
User avatar
Paul
Posts: 8603
Joined: Fri Sep 05, 2014 6:19 pm
Location: Bristol
Contact:

Post by Paul »

I too got this for the first time this morning!
Reversing out of a parking space on full r/h lock I thought I’d driven over a coke can or something! A real “ bang! as per the thread title.
Never experienced this in 10 months of SD ownership and 14 months of GTS ownership.
Only ever experienced the “ scrubbing” effect previously.
But, I hardly ever manoeuvre on full lock if I can avoid it and I was reversing too. Maybe a combination of this and the first (or second) really frosty morning (cold rubber) might explain.
1st Sapphire SD
2nd Sapphire GTS
viewtopic.php?f=23&t=4296
Current 992 S Cab
viewtopic.php?f=23&t=9845&p=196465#p196465
User avatar
Wing Commander
Posts: 19874
Joined: Tue Oct 06, 2015 5:43 pm
Location: Wiltshire

Post by Wing Commander »

Paul wrote: Fri Nov 17, 2017 11:56 am But, I hardly ever manoeuvre on full lock if I can avoid it and I was reversing too.

Manoeuvring on full lock (at very low speed) should not do any harm to the car should it, Paul? I pretty much do this via a three point turn every time I drive away from home. :?

P.S. Good to see the 'old school' avatar back. 🏁
Simon

Sold: 2016 Rhodium Silver Macan 2.0
Sold: 2013 Platinum Silver 911 (991.1) C2
Sold: 2017 Carmine Red Panamera 4
Mine: 991.2 Carrera T Racing Yellow 06/04/2018
Post Reply

  • Similar Topics
    Replies
    Views
    Last post