GT Car Alignment Specs - Share your set-up / knowledge
07-31-2022, 07:08 PM
#1021
I went from 11-12 minutes to 14-15 minutes on the rear for my last alignment along with the stiffer swift front springs. Car is much more stable under braking now and even better in the high speed sweepers too. That equates to about 2mm going to 2.5mm. I think either number can work for those who frequent the track. Most of my driving is to the track or on it, so tire wear is not an issue. They wear out before there is any unevenness. I do have TPC toe links as well. Maybe 3 mm is too much for most, but it should be at least 1-2 mm of toe in for the rear depending on your driving preferences. For reference, I believe the GT4 Clubsport cars run about 15-17 minutes of toe in for the rear axle.
08-01-2022, 01:39 AM
#1023
Three Wheelin'
I am running basically the same Forgeline size from BGB but in VX1Rs. John always knows his stuff. I am sure your car handles well.
Last edited by lovetoturn; 08-01-2022 at 01:50 AM.
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jreifler (08-01-2022)
08-01-2022, 01:50 AM
#1024
Three Wheelin'
When talking about toe settings, it would be helpful to keep the unit of measure consistent. You talk about MM, then move to minutes. I think it would be helpful for those who are not well versed on how alignment measurements works to stay with a common denominator.
I still get lost when converting MM to minutes, to degrees, to inches.
I still get lost when converting MM to minutes, to degrees, to inches.
Hope this helps. Edited post #1019.
Last edited by lovetoturn; 08-02-2022 at 12:51 AM.
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aarodynamics (08-01-2022)
08-01-2022, 05:10 AM
#1025
I went from 11-12 minutes to 14-15 minutes on the rear for my last alignment along with the stiffer swift front springs. Car is much more stable under braking now and even better in the high speed sweepers too. That equates to about 2mm going to 2.5mm. I think either number can work for those who frequent the track. Most of my driving is to the track or on it, so tire wear is not an issue. They wear out before there is any serious unevenness. I do have TPC toe links as well. For reference, I believe the GT4 Clubsport cars run about 15-17 minutes of toe in for the rear axle.
Maybe 3 mm (18 minutes) is too much for most as mentioned above, but it should be at least 1-2 mm (6-12 minutes) of toe in for the rear depending on your driving preferences.
All numbers mentioned here are per wheel, so you can double any of the numbers to get the total toe. There are of course 60 minutes in 1 degree, so for the example above, 12 minutes equals 12/60 or .2 degrees. It just amazes me how much difference there is between .1 and .2 degrees of toe-in on the rear end of the car when driven at the limits. Again we are talking about tenths of a degree, but when you are going 100+ mph it doesn't take much.
Maybe 3 mm (18 minutes) is too much for most as mentioned above, but it should be at least 1-2 mm (6-12 minutes) of toe in for the rear depending on your driving preferences.
All numbers mentioned here are per wheel, so you can double any of the numbers to get the total toe. There are of course 60 minutes in 1 degree, so for the example above, 12 minutes equals 12/60 or .2 degrees. It just amazes me how much difference there is between .1 and .2 degrees of toe-in on the rear end of the car when driven at the limits. Again we are talking about tenths of a degree, but when you are going 100+ mph it doesn't take much.
The rear toe spec you mentioned for the Clubsport sound close to the 3mm of toe-in per side I was recommending with non-offset toe links which makes sense given Clubsports typically wouldn't be swapping toe links to comply with competition rules/regs.
I found anything less than my recommendations above to significantly negatively impact my lap times and confidence on track.
The 1-2mm of toe-in per side should be considered a minimum and is fine for dual-purpose street/track or pure street cars that aren't driven near-limit on the track. With that said, I personally would still go for the minimums I recommended above instead and just consider tires the cost of doing business for a stable rear end on a Cayman.
Last edited by aarodynamics; 08-01-2022 at 12:52 PM.
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lovetoturn (08-02-2022)
08-01-2022, 07:11 PM
#1026
Three Wheelin'
Well said. I like a precise buttoned down rear end......and that works well for other things in life too. 
If you drive regularly at the track, you will be going through a few sets of tires per year anyway. If your car is setup properly for your driving style and ability, then the tires should wear evenly during there relatively short lifespan. If you drove a lot of road miles, yes you would wear out the inside edge of the rear tires with 2.5-3 mm of rear toe in, but again people with that much rear toe in tend to go through tires rather quickly.
If you drive regularly at the track, you will be going through a few sets of tires per year anyway. If your car is setup properly for your driving style and ability, then the tires should wear evenly during there relatively short lifespan. If you drove a lot of road miles, yes you would wear out the inside edge of the rear tires with 2.5-3 mm of rear toe in, but again people with that much rear toe in tend to go through tires rather quickly.
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08-01-2022, 07:19 PM
#1027
Rennlist Member
Well said. I like a precise buttoned down rear end......and that works well for other things in life too.
If you drive regularly at the track, you will be going through a few sets of tires per year anyway. If your car is setup properly for your driving style and ability, then the tires should wear evenly during there relatively short lifespan. If you drove a lot of road miles, yes you would wear out the inside edge of the rear tires with 2.5-3 mm of rear toe in, but again people with that much rear toe in tend to go through tires rather quickly.
If you drive regularly at the track, you will be going through a few sets of tires per year anyway. If your car is setup properly for your driving style and ability, then the tires should wear evenly during there relatively short lifespan. If you drove a lot of road miles, yes you would wear out the inside edge of the rear tires with 2.5-3 mm of rear toe in, but again people with that much rear toe in tend to go through tires rather quickly.
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lovetoturn (08-02-2022)
08-01-2022, 07:23 PM
#1028
I think every Cayman owner should get up to 80mph on the freeway, stomp on the brake pedal enough to engage ABS immediately, feel their rear end wiggle, and decide if they're comfortable with that even for street driving. For me, stabilizing the rear end would personally be worth a cost increase in tire consumables even for street driving since you never know when you're going to need to stomp on the brakes.
Last edited by aarodynamics; 08-01-2022 at 07:37 PM.
08-01-2022, 07:27 PM
#1029
Rennlist Member
I think every Cayman owner should get up to 80mph on the freeway, stomp on the brake pedal, feel their rear end wiggle, and decide if they're comfortable with that even for street driving. For me, stabilizing the rear end would personally be worth a cost increase in tire consumables even for street driving since you never know when you're going to need to stomp on the brakes.
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lovetoturn (08-02-2022)
08-01-2022, 09:37 PM
#1030
Rennlist Member
I’m amazed at the amount of detail in this thread. We don’t setup open wheel race cars with this level of alignment intricacy. Amazed it makes that much difference on a 3200lb road car.
The wiggle under braking in the GT4 has never bothered me on track but maybe it’s costing me time under braking. I also agree with the comment that if the car isn’t moving around on you then you’re just not going fast enough. It’s amazing watching a fast track day guy get in the passenger seat of a fast race car guy (which I’m not.)
The wiggle under braking in the GT4 has never bothered me on track but maybe it’s costing me time under braking. I also agree with the comment that if the car isn’t moving around on you then you’re just not going fast enough. It’s amazing watching a fast track day guy get in the passenger seat of a fast race car guy (which I’m not.)
Last edited by Bents; 08-01-2022 at 09:43 PM.
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lovetoturn (08-02-2022)
08-01-2022, 09:44 PM
#1031
Rennlist Member
I’m amazed at the amount of detail in this thread. We don’t setup open wheel race cars with this level of alignment intricacy. Amazed it makes that much difference on a 3200lb road car.
The wiggle under braking in the GT4 has never bothered me on track but maybe it’s costing me time under braking.
The wiggle under braking in the GT4 has never bothered me on track but maybe it’s costing me time under braking.
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lovetoturn (08-02-2022)
08-02-2022, 12:39 AM
#1032
Three Wheelin'
And Porsche knows that we exist to extract that last bit of performance that they had to leave on the table to satisfy the world market and make the car durable and warrantable. Somebody from Porsche also reads all this stuff, particularly these types of threads, and smiles, and thinks , they get it too… they are just like us.
Lots of great comments here.
Lots of great comments here.
Last edited by lovetoturn; 08-02-2022 at 12:43 AM.
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LZRD GRN (08-02-2022)
08-02-2022, 11:46 AM
#1033
RL Community Team
Rennlist Member
Rennlist Member
What exactly cause the wiggle under hard braking, which components and why?
08-02-2022, 12:08 PM
#1034
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08-02-2022, 12:14 PM
#1035
That said, whether or not overspecified, this thread was a great resource for me to get mine in a good spot, and after the mods & one iteration of adjustment I did, the car drives very differently than before, in a good way.
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