Traction Issues?

Nords · 06-04-2009, 12:45 AM

Hummmm, could it be because I'm running the Intrax on max softness but since fitting the Goodyear F1 assimetrics, the CSL doesn't grip particularly well. I was hoofing on a bit today on the roads around Chipping Norton and braked for a corner. Yes it was bumpy and I was going some, but the ABS kicked in for a significant length of time and I wouldn't have expected it. Tested the brakes/tyres on a smooth bit 2 minutes later and the tyres gripped much better (they performed as I would have expected), so bumps caused it? The front tyres don't seem to grip around roundabouts, hence allow much understeer than I would have expected.

I also went through a average 50 mph zone on the M40 and was followed by a merc of some description. The end of the zone came up, dropped to 3rd and floored it to leave him. The DSC light flashed frantically and it held the power back for 3-4 seconds before gripping and accelerating. On the way home, I was driving up Birdlip Hill and went around the roundabout in second, following a slow MCS which moved over eventually (I was then in third), floored it and again the DSC light lit up like fireworks night.

Pressures are 34 psi allround (cold), Intrax on max softness (I'm going to try the 35 clicks off max next). No snaking under power (it keeps on a straight line) so not RTAB?

Thoughts?

Hazy · 06-04-2009, 09:15 AM

It aint the tyres mate, I'm running the same tyres on standard suspension and have no problems at all. I run 32psi FWIW...

**Mark CSL** · 06-04-2009, 12:37 PM

34Psi sounds abit hard cold you might be running on the center of the tyre
no grip try 32psi

Nords · 06-04-2009, 08:11 PM

Dropped to 32 psi rear and 30 psi front. I just having a hard job remembering if Intrax is soft when screwed fully in/out (say clockwise when looking from above)...?

Just off to have a search...

Hazy · 07-04-2009, 11:02 AM

Quote:

Originally Posted by Nords

Dropped to 32 psi rear and 30 psi front. I just having a hard job remembering if Intrax is soft when screwed fully in/out (say clockwise when looking from above)...?

Just off to have a search...

Uh-oh, twiddling with summat you dont understand = the mother of all fq ups

Nords · 07-04-2009, 11:49 AM

I know matey, I wouldn't dare touch the GSXR's as it has all sorts of different adjustments. Just let Phil Macallen play with that (I think he opened his new shop in Lisburn this weekend too!)

A quick update, the tyres are 1000 miles old now and temperature cycled numerous times. The geo isn't quite right at the moment, Matt at Fearnsport were going to do it when I had the Goodyears on at Silverstone. Unfortunately the track rod ends on both sides were jammed solid and Matt didn't want to break them hence no adjustment there and then. I asked BM Wellsway to do the track rod ends during the Insp2 but the car is too low for them with the Intrax to KDS it without taking the bumpers off, so they did it 'roughly'. Adrian, the service manager there told me this over the phone and suggested Thorney do a full geo, although I was planning to take it back to Fearnsport as they are close.

All that said, would the geo being slightly out allow the DSC light to flash like a bugger (sic) on warm tyres, in a straight line on the motorway, at 60, when giving it full beans in 3rd? Or understeer at slow speeds around roundabout? It is just that it doesn't seem 'right'...

I have now altered the front suspension and lowered the tyre pressures to 30F and 32R cold...

06-04-2009, 12:45 AM	#1
Nords S5, Sport Off, DSC M-track Join Date: Jan 2009 Posts: 527 Casino cash: $1272	Traction Issues? Hummmm, could it be because I'm running the Intrax on max softness but since fitting the Goodyear F1 assimetrics, the CSL doesn't grip particularly well. I was hoofing on a bit today on the roads around Chipping Norton and braked for a corner. Yes it was bumpy and I was going some, but the ABS kicked in for a significant length of time and I wouldn't have expected it. Tested the brakes/tyres on a smooth bit 2 minutes later and the tyres gripped much better (they performed as I would have expected), so bumps caused it? The front tyres don't seem to grip around roundabouts, hence allow much understeer than I would have expected. I also went through a average 50 mph zone on the M40 and was followed by a merc of some description. The end of the zone came up, dropped to 3rd and floored it to leave him. The DSC light flashed frantically and it held the power back for 3-4 seconds before gripping and accelerating. On the way home, I was driving up Birdlip Hill and went around the roundabout in second, following a slow MCS which moved over eventually (I was then in third), floored it and again the DSC light lit up like fireworks night. Pressures are 34 psi allround (cold), Intrax on max softness (I'm going to try the 35 clicks off max next). No snaking under power (it keeps on a straight line) so not RTAB? Thoughts?

06-04-2009, 12:37 PM	#3
Mark CSL CSL Register Uber-poster! Join Date: Sep 2007 Location: Scotland Posts: 8,777 Casino cash: $42229	34Psi sounds abit hard cold you might be running on the center of the tyre no grip try 32psi __________________ www.procarkits.co.uk

06-04-2009, 09:15 AM	#2
Hazy S5, Sport Off, DSC M-track Join Date: Jan 2009 Posts: 582 Casino cash: $2853	It aint the tyres mate, I'm running the same tyres on standard suspension and have no problems at all. I run 32psi FWIW...

06-04-2009, 08:11 PM	#4
Nords S5, Sport Off, DSC M-track Join Date: Jan 2009 Posts: 527 Casino cash: $1272	Dropped to 32 psi rear and 30 psi front. I just having a hard job remembering if Intrax is soft when screwed fully in/out (say clockwise when looking from above)...? Just off to have a search...

07-04-2009, 11:49 AM	#6
Nords S5, Sport Off, DSC M-track Join Date: Jan 2009 Posts: 527 Casino cash: $1272	I know matey, I wouldn't dare touch the GSXR's as it has all sorts of different adjustments. Just let Phil Macallen play with that (I think he opened his new shop in Lisburn this weekend too!) A quick update, the tyres are 1000 miles old now and temperature cycled numerous times. The geo isn't quite right at the moment, Matt at Fearnsport were going to do it when I had the Goodyears on at Silverstone. Unfortunately the track rod ends on both sides were jammed solid and Matt didn't want to break them hence no adjustment there and then. I asked BM Wellsway to do the track rod ends during the Insp2 but the car is too low for them with the Intrax to KDS it without taking the bumpers off, so they did it 'roughly'. Adrian, the service manager there told me this over the phone and suggested Thorney do a full geo, although I was planning to take it back to Fearnsport as they are close. All that said, would the geo being slightly out allow the DSC light to flash like a bugger (sic) on warm tyres, in a straight line on the motorway, at 60, when giving it full beans in 3rd? Or understeer at slow speeds around roundabout? It is just that it doesn't seem 'right'... I have now altered the front suspension and lowered the tyre pressures to 30F and 32R cold...