If one of your track buddies has something like an AiM Solo, maybe you can borrow it to compare.

That said, magazine testing is on a level surface. Tracks often have banking which can allow you to take the corner faster than you could if it was flat.

 

Great point vantagesc! Banking is significant in the bowl at Lightning and at Turn 1 you are basically turning into a hill giving higher laterally G's.

 

I've been wondering the same.

I got a 1.13G reading just taking bend to enter the highway.

 

I would assume it is as accurate as base and S versions with the Sportschrono.

There was a thread a few months ago where someone compared it with his Aim Solo and they were very close indeed.

 

I think the Cayman's G-meter is like a country club scale in the locker room. It always reads light to make members feel good. In the caymans case it makes owners feel good that their cars are pulling big G's. carl

 

Recall that peak G's (which the car is showing I believe) is different than sustained G's (which is what magazines test on a skid pad).

You could probably get even greater G's showing on the car during break-away on a BIG, high-speed slide (might end ugly tho)!

 

The G-Force display is just an afterthought to the real function of the sensors which is input into the PSM system.
In my experience there is a definite difference that PSM will allow between SPORT and SPORT PLUS.
I have yet to turn PSM OFF to determine max G-Force and doubt I ever will.-Richard

 

I've run Lightning several times. Here's some data from my AiM Solo: Lightbulb 1.51, turn 2-3 combo 1.35, turn 4 (over the hill) 1.26. Track prepped 2007 Cayman S with R comps and suspension.

 

That's outstanding Bill - thanks for sharing! Your Cayman must be very well sorted.

 

Just wanted to add in some info from my suspension sponsor in autocross some years ago. He instrumented an Impreza STi with a race suspension and Hoosier autocross tires, and was measuring lateral G spikes as high as 1.6 G.

However, those numbers are seen in transition and not sustainable. I think the best sustained numbers he saw on those tires were 1.2 - 1.25 Gs.

So I totally believe the concept that a stock Cayman GTS on stock tires could hit a G spike as high as 1.4 G. But it won't hold that. The car may only hold that until the springs settle into their loaded position, then you're going to back to around 1.0 G.

 

I'd agree with the commenter saying it was high peak G-s that you achieved on a banking.

 

Mine was reading 1.05G on the skid pad but I am lowered on H&R springs with pasm also on more than half gone P Zeros.

The some of 911's in our group had readings as high 1.14G on the skid pad.


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I got this on a sharp canyon road turn..
2016 Cayman GTS... Factory 20" rims and tires...PDK......PASM sport .....NO PTV. PSM off.....

I am having my car's suspention retrofited with x73 ... Wonder if it will improve cornering g-force ?

I never use the instrument cluster g-force display... I find it to be very distracting.. At least so far....

 

The highest I've seen on my car is 1.32. Your gage must be faulty. It would be inconceivable (and impolite) for you to have generated higher values than I have.

 

The X73 will decrease body roll. Whether that improves max lateral acceleration depends mostly on your camber settings. However, chasing peak lateral acceleration isn't really what it's about. It's nice for bench racing and discussion, but the fact is that if you really set the car up to maximize lateral Gs, you're probably suffering in some other areas like transitional behavior and straight line braking.

Here's my contribution to the G-force meter pictures...

That was at an autocross last year on brand new Bridgestone RE-71R tires. Nearly took top time of the day at that event.

 

The X73 will decrease body roll. Whether that improves max lateral acceleration depends mostly on your camber settings. However, chasing peak lateral acceleration isn't really what it's about. It's nice for bench racing and discussion, but the fact is that if you really set the car up to maximize lateral Gs, you're probably suffering in some other areas like transitional behavior and straight line braking.

Here's my contribution to the G-force meter pictures...

View attachment 96369

That was at an autocross last year on brand new Bridgestone RE-71R tires. Nearly took top time of the day at that event.

Wow..JB... 1.6 ... Awesome!!! Was that on x73s? What size tire? 265/30/20? Do you have PTV?

I dont tune my car for g force at all.. Actually my car was/is on stock settings... I just enjoy pushing that envelope once in a while.
As we speak my car is being retrofitted with x73 by Porsche of Passadina CA and should be done by Thursday.... Its going to be alligned according to porsche standard x73 settings... No extra camber/toe or anything.

Now you have given me a new target .. LoL ...

Where do u go for Autocross?

 

How do I get the "Max G-force" setting? I have to go out and try... I've never managed to read the values while I'm driving and it bugged me. Didn't now there was a Peak reading... Haha...

 

I think you need to have PCM to get the display. On the PCM controls, press CAR, then OPTION, then select SET CAR and "Personal Settings". You should be able to figure it out from there. There are a bunch of different readouts you can choose from -- Max longitudinal and Max lateral G forces are just two of many available to choose.

 

I didn't know you could see that info on the pcm. I thought it was only available in the MFD.

here's mine btw on a semi-spirited first drive in the Spyder.

 

I didn't know you could see that info on the pcm. I thought it was only available in the MFD.

here's mine btw on a semi-spirited first drive in the Spyder.
View attachment 96441

.....

 

Learn something new every day. I didn't know about the max G-force readings in the instrument cluster. I guess those are more "permanent" than the ones I've been using in the PCM CAR display -- they seem to persist until reset, while the PCM ones reset when you turn the car off.

You'll need to upgrade from your stock tires to get these numbers.

 

Learn something new every day. I didn't know about the max G-force readings in the instrument cluster. I guess those are more "permanent" than the ones I've been using in the PCM CAR display -- they seem to persist until reset, while the PCM ones reset when you turn the car off.

View attachment 96689

You'll need to upgrade from your stock tires to get these numbers.

Challenge accepted! But I agree especially under braking! Let's see how much my stock Pirelli N1 specs can handle!

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Also keep in mind this measures PEAK G-forces, not AVERAGE G-forces. All G-force figures you see in instrumented testing are going to be average forces around a standard skidpad. Peak forces can potentially be much higher due to things like banking and road surface.

I personally have seen 1.4G on P-zeros and 1.5G on RE-71R tires. The meter is very accurate, you just have to consider the caveats of what it's actually measuring.

Here are my best numbers no the RE-71R:

 

Nice those are impressive numbers. Mine were not done on a racetrack. Maybe in fall I will do a track day at AMP or something.

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Good corning numbers but the acceleration seem a bit low!

 

Maximum acceleration figures are going to be achieved from a standstill launch. When driving onto a racetrack you're always rolling and you generally run a warm up lap before getting on it hard.

 

The best part of your picture is that your range shows 97 miles to empty with more than half a tank - that's the real indicator of how hard you've been pushing it!:drivingskid:

 

Ok .. I picked up my car.. And all afternoon i have been testing it..
Here are my impressions and issues i encountered.

I just had my 2016 GTS retrofited with x73... GTS is already 10mm Lower than standard.. With x73 you get another 10 mm..
And the differance is very obvious...
Personally i like the pasm (10mm) lower better. Looks more proportional. ..
The x73 ride compared to PASM sport mode is quite a bit harder... You feel every little bump on the road at low speeds..
At higher speed things feel a lot smoother.
Steering and handeling on x73 are amazing.. Precise, well planted..Quick... With less roll.

But at the end of the day i have decided to revert back to PASM but keep the x73 swaybars. Here is why:

On pasm equiped cars ..retrofitting to x73 has its problems and compromise..
The pasm and PDLS and sport and sport plus modes are all somehow connected in programming.
My porsche dealer was not able to make everything work after the install.
After disabling PASM ...My choice was give up PDLS or give up Sport and sport plus modes. .. For some mysterious reason they were not able to reprogram the car with both functions intact.

So the combination of the harsher ride at slower speeds .... The PDLS or Sport plus compromise...and the fact that i like the look of the car better when its only 10mm lower (pasm) as opposed to 20mm lower (x73)...has made me decide to go back to PASM.... I am Hoping that leaving the x73 swaybars will reduce some of the PASM roll/lean and provide sharper turnins and reduce pasm understeer.
Hoping this will be the happy medium for me..

Its been an expensive experiment.. But hey how else can one know what suits them best?

But i have to admit.. X73 is awesome if all you are concerned about is handling. Its superb!! And i don't feel clearance is that bad... Its quite manageable.

I have a backroad canyon road that i always go to and i try to test my skills and measure what i average given a certain Stretch of that road..
With PSAM I had 68mph average speed .... With x73 i was able to get 72mph average and it felt more confident .
Same stretch .. Same conditions.. No traffic. ..

As for PASM vs X73 ride comfort..this is how i would rate them

Pasm (sport off) comfort level 8......performance 5
Pasm (sport on) comfort level 6.5.....performance 7
X73..................comfort level 3-4....performance 9

Nothing scientific here.. Just how it felt to me...
To give you an indication of my driving ... I feel i drive pretty spirited when i drive canyon roads.. .....1.3 lateral g is common.. 1.4 happens here and there.. Gas milage 9mpg.....

P.s. For got to mention this... With the X73 ..my cars PSM and ABS kick in a lot earlier.. To a point where i found turning off PSM much more frequently ...
I am not sure if this is the way it is on factory equipped x73 caymans or not.. Maybe porsche detunes the PSM on factory x73 cars so that it will have a better ballance with the stiffer x73 .


I hope this can help those on the fence get some idea.

Next ill report when i go back to pasm and x73 front and rear sways.