Saturday I had another autocross in the GTS. This time I had changed the rear toe and camber (more of both) and while the car seemed a little better at first, the track unfortunately went greasy for everyone meaning a rather inconclusive result. At least it wasn't worse. I am going to more aggressively find a bar that a rather that either overlaps or is very close to the stock GTS front bar and then goes a bit stiffer. The 991 GT3 bar IMO is just going to be out of a range that works for how much I like the car to rotate.

Current alignment:

Front
-1.6 camber, 1/32 total toe out
Rear
-2.2 camber 1/16 total toe in

Video:

 

Was just wondering if you could expand on this. My understanding is for you to want more rear tire, your balance leans to oversteer more than you would like or you have trouble putting power down?

 

I'm currently running 265/35-19F/285/35-19R. I chose these sizes in part because my prior experience is to favor less stagger and a more neutral setup. I wasn't thrilled about the concept of a 30-40mm stagger (ie. 265/305) in that I thought it would invoke terminal understeer. Candidly, my prior experience is not in P cars and it completely failed to take into account the 43/57 weight distribution.

 

ah ha. I didn’t think about weight distribution either. Makes sense now.

 

It has a ton to do with how you drive, your alignment, and your sway bar choice. I think 265/285 could work if the rest takes that into account.

 

Not autocross related but took this setup to the National Corvette Museum Motorsports Park for SCCA Time Trials Nationals. The alignment change ended up being just a little bit of a mistake as the car was a bit pushy but tolerable. First time to this track, first time tracking this car, and on PS4S resulted in a 2:20.7 with easy potential for 2:19s given the traffic I dealt with on my best session. Pilgrim did a 2:16 with the same car to give you an idea what a pro can do. It confirmed I'll be sourcing a new front sway bar and going back to the zero toe setup.

Video of my fastest lap at NCM, including the out or "gap" lap:

 

Abqautoxer (Tom), what’s your reasoning with moving the PDK lever to the left. Do you actually shift manually, or do you do it once you shift to second gear, and use it to prevent the car from up shifting. Have you compared moving the lever to the left to just leaving the car in auto.

Thanks,
David

 

Another question for all you GTS guys......other than engine I think the suspension and driving dynamics are similar to my Cayman T.
My question is and I have been told that if the ABS engages then the PSM turns back on Have you experienced this ? Does it only intervene when ABS is activated for a short moment, and then system goes back to current stability settings.

 

Yes for autox I completely manual shift. Mostly it has to do with sub 30mph apex corners. The PDK's logic isn't tuned with autox in mind and won't go to 1st unless you are sub 20mph or so or go WOT. Any corner below 30mph, I want 1st as it gets rid of any lag and I can be smoother. The Yokos make 1st go to 44mph and I can put it down and be smoother. On track use, the PDK in full auto is fine:
I've hit ABS a few times during autox though rare and I think I would have noticed PSM coming back on and I haven't witnessed it. I run PSM off for autox.

 

I bet the big slide cost you most of a second by itself.

 

I have not had PSM turn itself back on as ABS engages but will also say these brakes are definite boat anchors. Not sure how often you will get into ABS. I have had no issue with the car putting the nannies back on.

 

Very likely but of course its the one session my RaceCapture didn't work to accurately gauge.

One comment I will say, my OE pads (or whatever the PO put on there) were not good. Switching to Ferodo DS2500 gave me the brakes I would expect in a Porsche and since I only have hit ABS on track.

 

I'd definitely consider Ferodo or Pagid pads but must admit the OE pads I'm currently running is not causing me issues. I just completed a weekend event where I was 2nd on index day 1 and FTD/FTDi day two with decent bench marker competition. I did experience some pdk quirks but nothing that wasn't something you could overcome.

 

Does the 718 SPASM need a scan tool for steering angle sensor ? I got an alignment from a local “race” alignment guy but I didn’t ask and he didn’t have.

thanks !

(sorry I also posted a separate thread because I was dying to know)

 

I don't know but since I do my own smartstrings alignments, I've never reset a porsche that I've done yet but this is newest I have done. Very curious if it does now.

Also, I installed a CMS front sway bar yesterday along with their modified OE bushings and endlinks. So far on the street you can tell on the middle hole you have more bar but its not a huge change giving me 2 holes I can go in either direction if needed.