Prospective 981 GT4 Owners Discussion Forum Vol 2
Discussion
I drove the Black PEC GT4 yesterday and was surprised by under steer, certainly needs a GEO tweak IMV. Initial turn in was ok but if you got yaw and balance with throttle you got mid corner push. Certainly the car has lots of mechanical grip but balance was to rearward for me. You can drive around it. Could be the car showing 6k and not sure how often the are aligned.
I will start with maxing the front camber, soften the front roll bar and maybe add more rake. One at a time of course
As you expect felt good on the road, right size and enough power
Biggest surprise was the brakes, you stop a lot quicker by getting out of the ABS trigger as quickly as possible, so the old slam and bleed out stops the car well suggesting the ABS module is relatively crude or not tuned for the GT4 or the tyre grip. Anyone who has raced a car with a road ABS module will be familiar with this.
Interested too see GEO's that work
I will start with maxing the front camber, soften the front roll bar and maybe add more rake. One at a time of course
As you expect felt good on the road, right size and enough power
Biggest surprise was the brakes, you stop a lot quicker by getting out of the ABS trigger as quickly as possible, so the old slam and bleed out stops the car well suggesting the ABS module is relatively crude or not tuned for the GT4 or the tyre grip. Anyone who has raced a car with a road ABS module will be familiar with this.
Interested too see GEO's that work
Porsche911R said:
not yet, geo tomorrow then I'll get on track and see how it fairs with the new bits and bobs.
was not happy how the car is on the limit so don't waste my time with stock geo on track.
Where have you driven it "on the limit" if not on a track? Or are you comparing to your PEC experience? I'd imagine it would be beneficial to drive it on a track pre-mods to improve your odds of getting the tweaks right first time, no?was not happy how the car is on the limit so don't waste my time with stock geo on track.
mdianuk said:
Where have you driven it "on the limit" if not on a track? Or are you comparing to your PEC experience? I'd imagine it would be beneficial to drive it on a track pre-mods to improve your odds of getting the tweaks right first time, no?
I'm curious too as to which roads you can drive this car at the limit ? mdianuk said:
Where have you driven it "on the limit" if not on a track? Or are you comparing to your PEC experience? I'd imagine it would be beneficial to drive it on a track pre-mods to improve your odds of getting the tweaks right first time, no?
nope, prob just kill a set of expensive cups, have a frustrating day and go home £1.5k out of pocket, which cost a lot more than a 2nd geo tweak.I have a set up in mind, i'll track the car after, do some pyro tests on temps and see where we are at, it's straight forward, people seem to think it's some black art !
Porsche911R said:
nope, prob just kill a set of expensive cups, have a frustrating day and go home £1.5k out of pocket, which cost a lot more than a 2nd geo tweak.
I have a set up in mind, i'll track the car after, do some pyro tests on temps and see where we are at, it's straight forward, people seem to think it's some black art !
Fair enough, just don't get where you've managed to "test the limit" of the car if not on a track?I have a set up in mind, i'll track the car after, do some pyro tests on temps and see where we are at, it's straight forward, people seem to think it's some black art !
mdianuk said:
Fair enough, just don't get where you've managed to "test the limit" of the car if not on a track?
any roundabout with a 60mph limit will tell you a lot about a car when you go round it at 1/2 the speed limit, thats even if you can get to 30mph round it !you can hit the limits of the GT4 at very low speeds and you also get a feel for the car on B roads on 40 mph bends 20 mph below the limit !
I also tracked at PEC yes and again that was dire imo lol
Added to that the USA track hack reviews and my past track experience, I'll get the geo done 1st ie tomorrow :-)
Good point on the brakes, they definitely find their way into ABS pretty quickly which then gets you into ESP and TC which can feel odd I found. I've only driven the PEC car so will be good to get some more miles in. Looking forward to learning more about the GT4 and how to get the best from it when its delivered....not long to go now!!
Jeweller70 said:
I drove the Black PEC GT4 yesterday and was surprised by under steer, certainly needs a GEO tweak IMV. Initial turn in was ok but if you got yaw and balance with throttle you got mid corner push. Certainly the car has lots of mechanical grip but balance was to rearward for me. You can drive around it. Could be the car showing 6k and not sure how often the are aligned.
I will start with maxing the front camber, soften the front roll bar and maybe add more rake. One at a time of course
As you expect felt good on the road, right size and enough power
Biggest surprise was the brakes, you stop a lot quicker by getting out of the ABS trigger as quickly as possible, so the old slam and bleed out stops the car well suggesting the ABS module is relatively crude or not tuned for the GT4 or the tyre grip. Anyone who has raced a car with a road ABS module will be familiar with this.
Interested too see GEO's that work
I will start with maxing the front camber, soften the front roll bar and maybe add more rake. One at a time of course
As you expect felt good on the road, right size and enough power
Biggest surprise was the brakes, you stop a lot quicker by getting out of the ABS trigger as quickly as possible, so the old slam and bleed out stops the car well suggesting the ABS module is relatively crude or not tuned for the GT4 or the tyre grip. Anyone who has raced a car with a road ABS module will be familiar with this.
Interested too see GEO's that work
ravon said:
That's six GT4's for LoT Spa, I've booked too !
Shame it's not a Gold Track event (day before for them I think). There was plenty of GT4's at their day on 8th/9th April and I was lucky enough to have two sessions of instruction with Calum Lockie. He was telling me what a great car the GT4 is and how one chap let him drive it to show what it's capable of, he was 4 wheel drifting it by all accounts. From how he was teaching me to drive a mere CGTS I think a session with him in your GT4 might throw all this rubbish about GEO out of the window! In my view a lot of these "issues" people are thinking they are seeing on the road with understeer and ABS etc are simply down to the fact that on road it's very difficult to get sufficient heat into the tyres to get them switched on.
With 3,900 miles of road and track on our car we aren't planning on changing anything right now.
With 3,900 miles of road and track on our car we aren't planning on changing anything right now.
jackwood said:
In my view a lot of these "issues" people are thinking they are seeing on the road with understeer and ABS etc are simply down to the fact that on road it's very difficult to get sufficient heat into the tyres to get them switched on.
With 3,900 miles of road and track on our car we aren't planning on changing anything right now.
+1 agree with cold tyres on the road. Especially if you are single digit ambient temps the tyres have even less grip and then ABS will be cutting in early too.With 3,900 miles of road and track on our car we aren't planning on changing anything right now.
I can't say I've noticed any ABS issues on track with warm tyres. In fact the brakes are pretty phenomenal. I have the PCCBs and you really can brakes many metres beyond your reference points from other cars (GT3s).
jackwood said:
In my view a lot of these "issues" people are thinking they are seeing on the road with understeer and ABS etc are simply down to the fact that on road it's very difficult to get sufficient heat into the tyres to get them switched on.
With 3,900 miles of road and track on our car we aren't planning on changing anything right now.
Where are you based ? now mine is done it's much nicer to pilot, takes a while to get heat into the tyres maybe 6 miles but it's easy done on the road as long as temps are above 10 which should be every day now, My bar goes from 1.8 to 2.2 which you can tell they have warmed up once at 2.2 up front. With 3,900 miles of road and track on our car we aren't planning on changing anything right now.
Braking heats up the fronts the engine heats up the rears.
I was told by the PEC that the PSM and TC learn your driving style and will intervene later and later based on the transitions in g forces.
Out of habit I start off with all driver aids turned on, then put sport on, the stiffen up the suspension --- but I have yet to switch off PSC or TC and rarely see the TC/PSM light flickering.
As for pad wear, I was told by my OPC after The Oulton RS day (and two previous track days --- the first at Oulton to finish in the running in process so quite gentle and the second shared with my Son at Cadwell Park who was learning to drive on track so half day) --- that the front pads are 4mm worn and the rears 2mm worn --- PCCB's
To me this suggests that TC and PSM are as I feel, not doing much ??
Out of habit I start off with all driver aids turned on, then put sport on, the stiffen up the suspension --- but I have yet to switch off PSC or TC and rarely see the TC/PSM light flickering.
As for pad wear, I was told by my OPC after The Oulton RS day (and two previous track days --- the first at Oulton to finish in the running in process so quite gentle and the second shared with my Son at Cadwell Park who was learning to drive on track so half day) --- that the front pads are 4mm worn and the rears 2mm worn --- PCCB's
To me this suggests that TC and PSM are as I feel, not doing much ??
ChrisW. said:
I was told by the PEC that the PSM and TC learn your driving style and will intervene later and later based on the transitions in g forces.
Out of habit I start off with all driver aids turned on, then put sport on, the stiffen up the suspension --- but I have yet to switch off PSC or TC and rarely see the TC/PSM light flickering.
As for pad wear, I was told by my OPC after The Oulton RS day (and two previous track days --- the first at Oulton to finish in the running in process so quite gentle and the second shared with my Son at Cadwell Park who was learning to drive on track so half day) --- that the front pads are 4mm worn and the rears 2mm worn --- PCCB's
To me this suggests that TC and PSM are as I feel, not doing much ??
After Oulton and Spa (and 3900 miles) I was expecting to see a lot of rear pad wear. But there doesn't seem to be any evidence of that. Wear is in line with a '6 GT3 showing more front pad wear than rear. This is on steals, for reference. Out of habit I start off with all driver aids turned on, then put sport on, the stiffen up the suspension --- but I have yet to switch off PSC or TC and rarely see the TC/PSM light flickering.
As for pad wear, I was told by my OPC after The Oulton RS day (and two previous track days --- the first at Oulton to finish in the running in process so quite gentle and the second shared with my Son at Cadwell Park who was learning to drive on track so half day) --- that the front pads are 4mm worn and the rears 2mm worn --- PCCB's
To me this suggests that TC and PSM are as I feel, not doing much ??
I was honestly expecting all the torque vectoring/E-diff effect to produce more rear wear.
David, I'm in south Manchester/Cheshire. I'll be at Donny on the 6th so will be interesting to see how the setups compare on track.
We were surprised to see at Oulton that when we pyro'd the rears that we were hotter on the inside. I know you're not a fan of the OEM settings on road, but they seem pretty for a "road" setup on track.
Only issue I've had is in the cold, on the Cup2's, getting heat in them.
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