991.2 GT3 track alignment
08-10-2018 | 04:41 PM
#107
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From: Denver
Hallo all.
So done some tracking now with my .2 gt3's. Also a raceprof has been using it for testing and teaching me how to be faster.
We both find it to totally UNDERSTEER.
So very thankful for any advice what to do to make it not so understeer. My raceprof recommends more camber and a slight (2mm total) Toe Out.
WHAT DO YOU THINK OF THIS??????
So done some tracking now with my .2 gt3's. Also a raceprof has been using it for testing and teaching me how to be faster.
We both find it to totally UNDERSTEER.
So very thankful for any advice what to do to make it not so understeer. My raceprof recommends more camber and a slight (2mm total) Toe Out.
WHAT DO YOU THINK OF THIS??????
Last edited by GrantG; 08-10-2018 at 05:15 PM.
08-10-2018 | 05:29 PM
#108
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Joined: Oct 2014
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This. I tightened up the rear sway to stiff last night and today on track the low speed understeer is noticeably reduced.
08-10-2018 | 11:30 PM
#109
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From: Little Rock, Arkansas
08-11-2018 | 05:48 AM
#110
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Joined: May 2015
Posts: 41
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From: Umhlanga Rocks, South Africa
When I was ordering tires for my new 19” track wheels to go on my 991.1 GT3 I noticed that Hoosier lists the 325/30/19 and the 345/30/19 at 26.8” dia.
This differs from your own measurements. Do you know why? Have you had a chance to measure the 345?
Are you aware of anyone that has tried this out?
Regards,
Lawrence
08-11-2018 | 07:03 PM
#111
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From: Houston
Thanks for this info Wind911, very helpful.
When I was ordering tires for my new 19” track wheels to go on my 991.1 GT3 I noticed that Hoosier lists the 325/30/19 and the 345/30/19 at 26.8” dia.
This differs from your own measurements. Do you know why? Have you had a chance to measure the 345?
Are you aware of anyone that has tried this out?
Regards,
Lawrence
08-11-2018 | 11:09 PM
#112
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Joined: Sep 2015
Posts: 987
Likes: 85
From: Little Rock, Arkansas
Thanks for this info Wind911, very helpful.
When I was ordering tires for my new 19” track wheels to go on my 991.1 GT3 I noticed that Hoosier lists the 325/30/19 and the 345/30/19 at 26.8” dia.
This differs from your own measurements. Do you know why? Have you had a chance to measure the 345?
Are you aware of anyone that has tried this out?
Regards,
Lawrence
08-13-2018 | 06:32 AM
#113
Intermediate
Joined: May 2015
Posts: 41
Likes: 1
From: Umhlanga Rocks, South Africa
I have not tried 345-30/19 on my .2 GT3. The numbers in my table are just calculated from the published sizing info not from real world measuring. Hoosiers sometimes has deviations on the actual size from the published size so it's hard to say. I don't think stock GT3 can fit 295/345 combo without rubbing. Hope this helps.
I'm going to try the 265/325 combo and see how we go.
08-13-2018 | 06:35 AM
#114
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Posts: 41
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From: Umhlanga Rocks, South Africa
I am running R7's 345/30/19 rear and 265 fronts. The 345's rubbed the fender on the drivers side ever so slightly, mostly because of the weight of the driver on that side. I raised the ride height a few clicks in the rear and that solved it. (the riased ride height was very small and resulted in No change in driving dynamics best I can tell).
What rear camber settings are you running?
08-13-2018 | 10:17 PM
#115
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From: Little Rock, Arkansas
09-24-2018 | 04:34 PM
#117
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Joined: Feb 2015
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From: Saratoga Springs, Ny
looking to copy this set up , do I need to purchase front and rear shims to get there or is it adjustable from the factory to get that camber ?
If if I need to purchase shims what size from tarret ? And do I need anything else before brining back to the dealer
also the car will be 80% track 20 % road , is this set up ok for that type of usage? running R7 on the track and sport cup2s for the street
09-24-2018 | 10:40 PM
#118
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My car felt very neutral on stock alignment, but I went with an aggressive alignment to address tire wear. I ended up at -2.7 front and -2.4 rear, 0 toe front, 0.25" of total toe rear, and stock front caster. Unfortunately the car now feels more numb on turn-in, and a bit over-steery mid turn. Need to mess with the sway settings I suppose... if tire wear doesn't improve dramatically, I may go back to stock alignment.
09-25-2018 | 12:33 AM
#119
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Joined: Sep 2015
Posts: 987
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From: Little Rock, Arkansas
looking to copy this set up , do I need to purchase front and rear shims to get there or is it adjustable from the factory to get that camber ?
If if I need to purchase shims what size from tarret ? And do I need anything else before brining back to the dealer
also the car will be 80% track 20 % road , is this set up ok for that type of usage? running R7 on the track and sport cup2s for the street
I do exactly as you do - about 80 percent track and 20 percent street. I think the set up is perfect so far. I also run R7's on track (with 19 inch forgeline) and cup 2's on road
09-25-2018 | 12:34 AM
#120
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Joined: Sep 2015
Posts: 987
Likes: 85
From: Little Rock, Arkansas
My car felt very neutral on stock alignment, but I went with an aggressive alignment to address tire wear. I ended up at -2.7 front and -2.4 rear, 0 toe front, 0.25" of total toe rear, and stock front caster. Unfortunately the car now feels more numb on turn-in, and a bit over-steery mid turn. Need to mess with the sway settings I suppose... if tire wear doesn't improve dramatically, I may go back to stock alignment.