thesaintusa

What tires is he running?

Dsc wouldnt change the lack of traction or hop, but I could be wrong.

Tier1Terrier

PS4S but he is switching to Cup 2s.

My thinking is that maybe there's a way to keep the rear of the car better/more planted under hard acceleration which would reduce the wheel hop.

IRunalot

You can make changes to the rear compression and rebound in the velocity tables to reduce the hop. I just can't tell you HS/MS/LS as I don't know the frequency of the wheel hop. I would start with high speed rebound and compression on the rear in increments of +1-2. Do rebound first if that does not help try compression. Once you get to where the wheel hop stops, start to back it out in .2 increments, then in .1 increments. The reason you want to back it out is this change will impact the ride and ether rear will either have more compression or too much rebound and the rear will feel like it "sticks" over uneven pavement and rear will be rough as the wheel will not decompress into road imperfections.

It's a balancing act but you can easily fix it.

Another trick would be to lower the rear LS compression or lower front LS rebound to allow more weight transfer to the rear which might stop the hop due to the extra traction from the increased rear weight. Still need to control the wheel frequency if the wheel slips and hops.

You have to try all of the above to find the right compromise.

If this is strictly for launching out of a dig then use the DSC launch control maps so you can set the launch control to have a different damper profile than the one that you have while driving.

This is typical of the DSC as it lowers the overall damper control until the G-Table is activated via the thresholds in the G Comfort Parameters. This is not a bad thing you just need to know your requirements and use case then tune accordingly.

Here is what a LNC map looks like, note the stiffness of the velocity values (dark colors) compared to the regular map:

thesaintusa

As another mentioned, adjusting the launch file foe the dsc may help with rearward weight transition.

enzotcat

I've had the same - GTS turbos, stock suspension (at first, I've subsequently changed it). The wheel hop is actually from the traction control. Tell him to launch with TC fully off, and things are better.

Tier1Terrier

Thanks @enzotcat . Just to clarify, this technically did not occur during a "launch" so to speak. This car is a 7MT. This was just under ordinary hard acceleration. It happened from 1st to 2nd gear, and from 2nd to third, and not even at redline. I would hate to think that the only way to eliminate the wheel-hop is to disable traction control, but I suppose that could be the price to pay for having that much increased power at the rear of an already light vehicle. The dyno showed 586 tq / 575 hp.

thesaintusa

@enzotcat
Do you find your 1/4 mile and 0-60 times better with TC fully off?

enzotcat

Mine is also a 7MT. Yes, it happens at the top of 1st gear and at the top of 2nd gear - with the TC off you get wheel spin as opposed to hop. Interestingly I don't notice it on the track, probably because I'm feeding in the throttle in a more controlled manner on the track than on the street where I can just floor it 🤣

TBH, I haven't checked that - it's really hard to find a safe place to do a 0-60 or 1/4 mile on the street, so I don't do that.

Tier1Terrier

Perhaps I may have mis-diagnosed the issue. Can't say for sure if it's wheel spin or wheel hop. When I drove it for just a few miles, it only happened under hard acceleration while shifting gears.

thesaintusa

Agree on the street not ideal doing 1/4 mile runs. I have noticed that the Cup 2 and Nankang CR-S still 'light up' when throttle is applied in 1st, 2nd and 3rd gear and will leave 2 strips of rubber visible in the rear view mirror. The OEM P Zero also spun in 1st and 2nd, but less so in 3rd.

FWIW cannot comment on hop/spin when shifting as i have a PDK, but curious to hear what others think / how this was solved.
My RX-7 was/is notorious for terrible wheel hop with launches such that upgraded diff bushings, upgraded trailing arms, and differential braces were invented/designed/available to address this. Nothing like cracking the PPF with a hard launch, and nothing sounds more abusive / feels abusive to a car than brutal wheel hop.

McKlyde

I've recently acquired a DSC controller, and I've noticed that the braking is much much smoother and there is no jerk at all during downshifts. I don't believe Porsche would implement a jerking effect when braking! Could this indicate that the shocks are worn?

As shocks wear down does the DSC controller account for this and adjust the power/command to the shocks? and the stock PASM controller simply statically provides power thus not able to dampen during braking?

colnagoG60

Given that there are ride height and position sensors, which the controller uses to manage dampening, I'd say, "yes".

DarienA

I think I saw in another discussion that the default DSC setup is not recommended for lowered 911's. Is that correct?