dbbarron

I'm providing more detail above. I've drawn a 1g box around the actual g-circle data from a fast run. You can see that 1g box (related this to the g-grid in DSC software) being fully utilized in turning and braking (since the course ran clockwise, only look at the left g data) but the region over 0.5g acceleration is not really utilized.

Is there any reason to better match the full g-grid to the actual data of a typical AX run?
If so, what would one do?

Tom@TPC Racing

It makes sense only if max stiffness is required to achieve the balance that the driver prefers.
For reference, DSC Sport Product Specialist, Jeremy Martien, provided support at the SCCA Solo National AX Championship this week. There were 30+ talented drivers on well prepared cars running DSC, Two Overall Class Wins on DSC, all using either original g-table or GRS.

Paul in San Jose

I'm a new DSC Sport owner on a 991.1 GT3. I have a question about the "Velocity" section. The table talks about the rate of compression/rebound of the shocks:
Low: 0-3 inches/second
Medium: 3-5 inches/second
High: 5-8 inches/second

As best I can tell, the table contains offsets from the normal damping, so -5 means take 5% off whatever the damping would have been absent movement of the shock (can someone confirm?)

But there's a note that this feature is not enabled until the ride height is zeroed out. Which confuses me, because the rate of movement of the shock shouldn't be dependent on the position. Can anyone explain? Does anyone use this feature, and if so, have they found it to make a meaningful difference? Finally, what do the Stop, Start, and Current entries in the Compression and Droop section do?

Tom@TPC Racing

Hi Paul,

Correct, each number in Velocity table is an offset of the G Force table.

I agree that the note regarding zero'ing the ride sensors adds confusion.

The Velocity damping offset function for a 991 does works without zero'ing the ride height sensors since this function is based on rate of change of the sensor movement and direction of the movement.

At the bottom of the Velocity page there's the Travel Stops function(Start, Stop, Compression,Droop), that's for setting electronic bump stops and droop limiters. This is a very advanced tuning parameter for customized applications. For majority of the users it is best to leave the values at 0. The Travel Stops function works best for Tractive dampers.

Zero'ing is only necessary if you are going to the electronic Travel Stops in the Velocity page and if you have radically changed the car's ride height and need other systems on the car(ABS, TC, FAL) to recognise the new ride height as zero.

PS- This the 997 forum section, 997's don't have height sensors like the 991's do, thus 997's don't have Velocity function, so probably no one else in this section know what you're talking about

Big Swole

BTW Tom....Love the new Launch Control Feature. It helped me gap and spank an brand new ZR1's A$$!!!

I Even let off and hit the brakes to keep from breaking out of the 11.00 Index class and still ran a 10.80 to his 10.92. My normal trap that night was 127-128.

Thank you!!

jayi836

Nice work are you still running an OTS tune on pump gas?
2.88 0-60 and the 10.88 1/4 mile is insane

Tom@TPC Racing

Congrats on the great launch and the great run! Glad you love the new DSC Launch Control! Its like you have drag racing shocks or something...
Thank you for sharing the vids!

Big Swole

Yes Sir. OTS Stg.2 - 93 pump gas tune and my Europipe. That's it. My first all out pass was a 10.78 @ 127.2. Very HOT / Humid weather this day. DA was at 3000+.

The car weighed 3825 lbs. with me in it. I scaled it at the track.

Yes Sir! Thank you again Sir. Great product (All in one now)!!.

CT944

Got the DSC controller today from Soul via TPC who was great to work with and shipped overnight. Simple 15 minute install, though not a lot of space to work with and a bit annoying given lack of mobility, but a lot better than most DIY jobs. Impression from my quick 5 mile ride is that is does make the ride a lot smoother. At very low speeds (<10 mph) on a real choppy road it doesn’t feel like much difference but at speed a lot more smooth and softer compression and rebound which was what I was looking for. Suspect I’ll get more feedback as I drive it more, but so far feels like a nice addition.

CT944

Got a nice 15 mile ride in today, highway and backroads. It's even better than I initially thought. Much smoother around town and dampers seem to now soak up the bumps 100% more than before. I used to have a bit of a bottoming out type feel, likely from the firmness, but now most of that is gone away and my car feels a lot more like my 997 GTS did. Nice mod, highly recommended as first step to a better street suspension feel. I can only imagine what the Tractive set-up feels like, that seems like a nice natural update from here.

Fl0pp3r

Hi Tom, hope all's well. Interested in trying the latest map (02-12-20) for 997.2 - i'm still using Tuner software version 1.7.1 - do i need to upgrade to 1.9.3 first?

Cheers as always!

Phil

Tom@TPC Racing

The answer for your question is in post #333 in this thread-
https://rennlist.com/forums/997-foru...thread-23.html

The Feb updates has no performance difference on a 997. The reason for the Feb updates was because DSC added Dodge Demon and Hellcat to the application, thus the communication software(DSC Tuner) needed to add the names of these new cars to the selection. These two cars are drag race oriented cars so in the communication software the launch table had a few more cells added in. As such, every cal file needed to be updated so that the those added cells doesn't show a value other than zero. Because when opening a previously written cal file on a newly revised communication software that has more cells to fill in, the previously written file can show some random number in those newly added cells that wasn't there before. The DSC team revised every file on the list to work with communication software version 1.9.3 because of the two Dodge cars added.

There's absolutely no need to download and use comm software(DSC Tuner) version 1.9.3 for any Porsche 997, 991. If you have the previously comm software it will perform just as awesome. I use the older version on my 997.

Sorry I don't have a centralized way of sharing this info and the thing is while everyone want's the "newest" but the newest software doesn't always work best with the older device or car.

Fl0pp3r

Understood Tom, thank you for confirming.

Hope you and everyone else over there are ok and not going too stir crazy. :-)

Philip, UK

HarmonyJim

Hey Tom, I have your DSC unit (with the required accelerometer) in my 997.1 RS. Can the 997 cars be updated to the 991 DSC versions with the acceleration of the shock being one of the variables accounted for? I realize the corners would need the shock/suspension movement sensors, along with bringing the wiring into the DSC harness. Can this be accomplished relatively easily? Did you do this to your car? Does it make a significant difference for 997 cars? Thanks in advance.

Tom@TPC Racing

Hi Jim. That is a good question. I have lightly considered it but have not had any heavy thought on adding travel velocity tuning function on my own 997.1 car. In theory, a 991 DSC should work for such custom application, with extra work involved of course. Or start with a custom made DSC like the one shown in image below. This is a special water proof limited-production DSC that was made for Cup cars and prototypes with travel velocity pins built-in. Perhaps in the future we may offer this option for 997 cars, but I think at this time I think the cost vs. gain ratio is not favorable.