Geometry and tramlining - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

tokyogtr · 9th April 2008, 02:59 AM

I'm getting a lot of tramlining with my GT-R at present. The performance center told me all gt-rs come with the geo setup for the circuit. If clients want the road setting then they can change it for a small fee.

Is anyone else getting extreme tramlining? And has anyone had their car geo changed to street mode?

DCD · 9th April 2008, 04:13 AM

Normal for a GTR. Tramlining has a lot to do with the tread pattern of the tyre, the more longitudinal the design is the more it will follow road imperfections. I'd doubt you'd get much of an improvement with a straighter geometry set-up. I did notice it less on a R35 I drove with the Dunlops however

tokyogtr · 9th April 2008, 04:59 AM

in my exige i never had tramlining issues until i upgraded the suspension and made the geo more aggressive. then it tramlined like a SOAB. shouldn't be just to do with tyres and tread pattern.

doggiehowser · 9th April 2008, 02:18 PM

I think the tramlining was pretty bad initially. Seems to have smoothened out a little after abt 2000km on the clock.

And I do think tramlining has to do with the tyres. On my old Evo.. I changed from stock A046 tyres to semi slicks A048 (keeping same Ohlins suspension and geometry), the tramlining was very apparent.

Beer Baron · 10th April 2008, 01:46 AM

dino is right. tramlining is probably 70-80% down to tyre type and size. the wider the tyre the worse the tramlining. GTRs suffer this a lot as they generally run comparitively wide front tyres (usually a 255+ on 32s and up). it's also much worse with any type of 'performance' tyre.

one of my GTRs is a very track focussed R32. and even with it's very agressive suspension set-up the amount of tramlining varies a lot when I run on the A048s or the RE55s compared to my street tyre AD07s. suspension geometrey change may help a little, but mostly it's down to tyre size and type.

tokyogtr · 10th April 2008, 01:48 AM

so i guess once the tyres bed in more the tramlining will improve?

DCD · 10th April 2008, 02:05 AM

Quote:

Originally Posted by tokyogtr

so i guess once the tyres bed in more the tramlining will improve?

I think after your day at Fuji it will improve a bit.

tokyogtr · 10th April 2008, 02:49 AM

Quote:

Originally Posted by DCD

I think after your day at Fuji it will improve a bit.

cool. still need to find out when the circuit mode function switches off after the trackday...

DCD · 10th April 2008, 03:28 AM

as soon as you leave the fuji grounds...

tokyogtr · 10th April 2008, 03:44 AM

i changed the location of the car to fuji but the circuit mode option did not enable. this sucks. it means on a really bas weather day that the car will not enable circuit mode even if you're at the circuit. f'ck this place p1sses me off sometimes.

timechaser · 16th April 2008, 11:42 PM

I have heard that the potenzas are mofos for tramlining. Something to do with the tread pattern as already mentioned. The Dunlops might be better in this regard.

9th April 2008, 02:59 AM	#1 (permalink)
tokyogtr GTROC Member Join Date: Feb 2008 Location: Tokyo Posts: 1,094	Geometry and tramlining I'm getting a lot of tramlining with my GT-R at present. The performance center told me all gt-rs come with the geo setup for the circuit. If clients want the road setting then they can change it for a small fee. Is anyone else getting extreme tramlining? And has anyone had their car geo changed to street mode?

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9th April 2008, 04:13 AM	#2 (permalink)
DCD GTR Register Member Join Date: Jun 2001 Location: Tokyo Posts: 9,296	Normal for a GTR. Tramlining has a lot to do with the tread pattern of the tyre, the more longitudinal the design is the more it will follow road imperfections. I'd doubt you'd get much of an improvement with a straighter geometry set-up. I did notice it less on a R35 I drove with the Dunlops however

9th April 2008, 04:59 AM	#3 (permalink)
tokyogtr GTROC Member Join Date: Feb 2008 Location: Tokyo Posts: 1,094	in my exige i never had tramlining issues until i upgraded the suspension and made the geo more aggressive. then it tramlined like a SOAB. shouldn't be just to do with tyres and tread pattern.

9th April 2008, 02:18 PM	#4 (permalink)
doggiehowser GTR Register Member Join Date: Oct 2007 Posts: 416	I think the tramlining was pretty bad initially. Seems to have smoothened out a little after abt 2000km on the clock. And I do think tramlining has to do with the tyres. On my old Evo.. I changed from stock A046 tyres to semi slicks A048 (keeping same Ohlins suspension and geometry), the tramlining was very apparent.

10th April 2008, 01:46 AM	#5 (permalink)
Beer Baron GTR Register Member Join Date: Jul 2006 Location: Sydney, Australia Posts: 258	dino is right. tramlining is probably 70-80% down to tyre type and size. the wider the tyre the worse the tramlining. GTRs suffer this a lot as they generally run comparitively wide front tyres (usually a 255+ on 32s and up). it's also much worse with any type of 'performance' tyre. one of my GTRs is a very track focussed R32. and even with it's very agressive suspension set-up the amount of tramlining varies a lot when I run on the A048s or the RE55s compared to my street tyre AD07s. suspension geometrey change may help a little, but mostly it's down to tyre size and type.

10th April 2008, 01:48 AM	#6 (permalink)
tokyogtr GTROC Member Join Date: Feb 2008 Location: Tokyo Posts: 1,094	so i guess once the tyres bed in more the tramlining will improve?

10th April 2008, 03:28 AM	#9 (permalink)
DCD GTR Register Member Join Date: Jun 2001 Location: Tokyo Posts: 9,296	as soon as you leave the fuji grounds...

10th April 2008, 03:44 AM	#10 (permalink)
tokyogtr GTROC Member Join Date: Feb 2008 Location: Tokyo Posts: 1,094	i changed the location of the car to fuji but the circuit mode option did not enable. this sucks. it means on a really bas weather day that the car will not enable circuit mode even if you're at the circuit. f'ck this place p1sses me off sometimes.

16th April 2008, 11:42 PM	#11 (permalink)
timechaser GTR Register Member Join Date: Feb 2008 Location: Singapore Posts: 145	I have heard that the potenzas are mofos for tramlining. Something to do with the tread pattern as already mentioned. The Dunlops might be better in this regard.