Handling weirdness

[jtdbsr]

Picked up my car a week ago and just started to notice that if i hit a dip in the road around curves only, the car wiggles side to side. This is very pronounced from the rear and less so in the front. Only happens at a more spirited pace, like the other day when getting onto the Garden State Parkway in a slight right hand turn accelerating in third gear the car lost all composure after going over a slight depression in the road.

I'm a little perplexed as to why when otherwise it handles very nice and feels so composed. Hitting a bump under the same circumstances does nothing. Did anyone else notice this?

[ThatVdub]

Yes, that is the car swaying, and happens to me as well, and it is not a safe feeling at higher
speeds. Normal? Don't know, need to get my shocks checked out. When I pulled my cowl off
to get to the ECM, the top of one strut is really rusted out. New car and covered? I sometimes
hear a clunk when I drive on the same side. I bought this car with 27 miles on the clock.

Also, people here did not believe me when I said, that my MK4 R32 with old/crappy oem shocks
takes this turn at 120, while the R can't pass 110 w/o thinking I am going to lose control.

[BluDemon]

Not normal.

Did you check the tire pressures?

Jack them up to 41psi and I bet the wiggle ness goes away.

What tires came on your car?

[jtdbsr]

Hmm, interesting. Running the stock Dunlops. Lowered the pressures to 37F/35R because the 41Psi all around seemed way too high for me on a light car as this. My C6A6, which is a barge by comparison, had 36F/33R for recommended pressures for the 18" wheels.

ThatVdub- what pressures are you running?

I'll try 41 on all 4.

[jsausley]

I run 38 PSI on Michelin Pilot Super Sports, identical to OEM size and Neuspeed sport springs with stock struts and an HPA Comp controller. The car handles like a dream.

[ThatVdub]

ThatVdub- what pressures are you running?

I'll try 41 on all 4.

Dealer last re-pressurized it with Nitrogen, on my recent and pretty late 90 day thing.
I want to say 44 PSI, even though car says to do 41psi.

I have P Zero Nero's...

[Tiguan2011]

my car does this as well. tiguan did the same thing. i only notice it around 1 corner.

[r1eater]

its an artifact of the haldex system. Mine does it too, it doesnt like uneven surfaces in turns at spirited speeds.

[Dutchmastr9]

lower it, its the only solution

[Pdyno]

It's a common trait when you lift off the throttle on a AWD haldex system. Keep on the throttle and brake late and it won't be an issue.

[nectar13]

It's a common trait when you lift off the throttle on a AWD haldex system. Keep on the throttle and brake late and it won't be an issue.

^this

[Rebellionelite]

It's a common trait when you lift off the throttle on a AWD haldex system. Keep on the throttle and brake late and it won't be an issue.

Or get a HPA Comp controller, problem solved.

[ThatVdub]

Or get a HPA Comp controller, problem solved.

Better yet, a gen4 one that is switchable btwn eco, stock and race.

[Rebellionelite]

Better yet, a gen4 one that is switchable btwn eco, stock and race.

The compeition controller keeps the rear wheels engaged while braking, so you won't have that awkward power transfer braking into a corner. Switch can't do that.

[ThatVdub]

The compeition controller keeps the rear wheels engaged while braking, so you won't have that awkward power transfer braking into a corner. Switch can't do that.

I don't really care about that, you are braking, actually prefer it to release when braking as a
DD. shoot, most of the time I will be in eco mode, since I do a lot of hwy driving and want less
drivetrain power loss and better fuel economy.

What matters to me most is that it doesn't dis-engage when releasing throttle, when I am driving
a bit spirited and around turns, but it will release (since it ramps down) after some time.

I know you bought this and like it lots, but I never wanted a comp and never will. But that is me.

[twister5]

I found 41psi of tire pressure too much, the car seemed to bang over bumps and the ride felt too lively. Since I don't normally drive around with a full load of people and cargo, I lowered pressures to 38f/36r. The car rides better now and I've noticed no poor-handling issues during normal street driving. I plan on keeping an eye on the tires to make sure there's no uneven wear running these pressures. If not, I'm keeping them the way they are.

[ThatVdub]

The problem with lower pressure? You risk easier rim damage. The front is the worst. I used to
run 38psi up front on my MK4 R32, felt comfy, but I went through a couple of wheels and tires
together. So, I up'd it up to 44psi, and if anything get damaged, it was the tire(s), mainly.

[jtdbsr]

I may get the HPA controller, but some of you guys have missed an important part of my OP. I'm on the throttle accelerating when this happens, not while braking. And only when going over a dip, never over a bump.

Raised the tire pressures to 41 and its way too harsh. Going back to 37F/35R which felt perfect.

[ToeBall]

I may get the HPA controller, but some of you guys have missed an important part of my OP. I'm on the throttle accelerating when this happens, not while braking. And only when going over a dip, never over a bump.

Raised the tire pressures to 41 and its way too harsh. Going back to 37F/35R which felt perfect.

I noticed something a bit like what you're talking about. Usually, it seems to happen over crests or other rolling terrain. I've tested it a bit and the electronics seem to be both the cause and the solution. At least it feels like it's trying to predict where to transfer the power and sends to much to the rear when the front unloads, then it overcompensates the other way, then stabilizes back out. Happens very quickly and regardless to you reacting to it or not, the electronics seem to fix it in a moment.