rs10

I've just posted a thread with a very similar title in the performance modifications forum, here:
https://rennlist.com/forums/performan...l#post13898932

(I wasn't sure where to post this, but then I realized that this will equally interest/disinterest owners of virtually any other 2 door Porsche, and maybe even some 4 door Porsche owners as well. And it seemed silly to have one discussion in the 991 forum, another in the 991 GT2/3 forum, etc.

On the other hand, the performance mod forum doesn't get a lot of traffic. Solution? Threads like this in a few forums to let anyone interested know to go to the performance mod forum.

Hope this is helpful!)

Jamie@dundonmotorsports

We're developing a data logger that when finished would allow you to measure the ride height sensors (shock potentiometers) to get a way to quantify aero changes on the car (lift and downforce). Drag is a little harder to quantify out in the wild. You need pitot tubes or other pressure sensors on the car ideally in a controlled environment like a wind tunnel... Or you need a precise method of measuring top speed at WOT over a fixed distance to back out drag...

Jean

To measure drag its rather simple to do using a GPS datalogger.. Speed up to 200+ kph (the highest the speed the better) put the car in neutral and let it coast down to about 100kph. With a formula you can then calculate drag. The datalogger will measure slope of the road as well, important because you need to eliminate the road slope impact.

You also need to do a low speed rolling resistance test on the same road.. Same as above but low speed preferably 60kph to 30kph or so.

I did this recently with the 991Turbo and drag results were almost exactly the same as factory CDxA numbers in both normal and sport+ mode. If you search the 993TT forum we did these tests several years back also measuring the impact of the 993GT2 wing. Here is one but there is others..

https://rennlist.com/forums/993-turb...c-musings.html

For downforce and lift, you will need the help of sensors as Jamie above said. Downforce and lift data is however available for most cars from German Autobild/Sport Auto tests and others good publications.

rs10

The side height sensors that come with the car? (That's what I'm looking to do.) Or would one need to add sensors?

rs10

Indeed, it's available for cars. But not for modifications. Even OEM mod's. Good luck, for instance, finding the drag and lift impact of the 991 aero kit with the duck tail. And there are gaps. One that annoys me is the original GT3.

batmanm3

saved this from some thread on here...This is for 991 GT3 RS

Jamie@dundonmotorsports

Yes the sensors are already there, the trick is getting access to them, that's what the logger we're putting together will help with!

rs10

OK, sounds good so far. Though I just thought of one possible problem: Are the sensors still there, and functioning, if one has aftermarket coilovers?

Jamie@dundonmotorsports

Yes sir


The sensor is on the upper swing arm (credit to Elephant racing for the photo)

edub

@Jamie@dundonmotorsports welp, I'm doing this same work right now trying to figure out how to measure the ride height sensors. Did your research turn into something?