ALIGNMENT SETTINGS QUESTION (PP1 SPEC OR GT350 SPEC)?

[PUNISHER7772]

I have a 2018 GT PP1, I'm installing 20X10 with a 295/30/20 F and 20X11 with a 295/35/20 R. My original set has around 27k but I have the dreaded front inner tire wear which I believe is mainly due to toe being off a little as the rest of the tire looks pretty good. The rear looks pretty good overall right now and I did have it aligned about 10k miles ago but they didn't really touch anything except the front toe. I did ask for specific settings before the job and was told no problem but not the end result. I do run auto cross once maybe twice a year and same with the drag strip. Looking at the Ford specs it seems the run a little more aggressive in the front on the GT350 and GT350R but much less aggressive in the rear. I know the suspension is different between the two but the tire are also much wider, are the specs based more on the balance of the car, the different suspension parts, or the wider tires?
I would actually like to run around -1 deg of camber front and rear, caster around 7 deg, and 0 toe in the front and around .10 in the rear. I realize I may need front camber bolts for fine tuning but any idea how much play is in the rear camber settings? Car is not lowered but does have some IRS parts added (see signature).
Also I know 27k on P4S isn't that bad with the way the car is run, would just like to have a little better/even wear in the front. I've attached 3 pics of the front tire and 1 of the rear, also the alignment paper from when I had it done.

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[NightmareMoon]

I believe that is a tire comstruction issue with the michelins, not an alignment issue. We get a lot of reports about inside edges going out with michelins soecifically and it doesn’t seem to matter if you have 1 degree or 3 degrees of camber.

Also make sure you aren’t driving around with low air pressure too often.

 

[PUNISHER7772]

I believe that is a tire construction issue with the michelins, not an alignment issue. We get a lot of reports about inside edges going out with michelins specifically and it doesn’t seem to matter if you have 1 degree or 3 degrees of camber.

Also make sure you aren’t driving around with low air pressure too often.

Thanks for the response, low pressure is never an issue. I actually tend to run them a little higher than Ford suggests. The fronts are never under 37-38 PSI and actually found they seem to have a little more bite up there versus the 32-35 PSI range. I think I may aim for zero toe or possible maybe slightly under but I think I need to get the front camber equaled out as well. I'm also wondering if the caster being slightly higher combined with the toe setting was adding to it. I know I'm pretty limited in the front without CC plates though.

 

[shogun32]

Any particular reason not to flip the tires inside out?

 

[NightmareMoon]

Any particular reason not to flip the tires inside out?

They are directional, so we can’t rotate them. They have a dry grip compound on the outside shoulders and use a wet optimized compound in the center and inside edges.

37/38 cold is quite high. If those are hot pressures, its still high but not so much. The ride is noticeably harsher and grip should be falling off up above 37 or so.

 

[shogun32]

They are directional, so we can’t rotate them. They have a dry grip compound on the outside shoulders and use a wet optimized compound in the center and inside edges.

sure, but for someone getting bent out of shape over having to spend money and also insisting to run high perf tires, for street use I can't imagine why one would care if the compounds are flipped. It's not like street use needs compound specialization.

37/38 cold is quite high. If those are hot pressures, its still high but not so much. The ride is noticeably harsher and grip should be falling off up above 37 or so.

Yeah I tried 38 cold just for laughs once and traction was very lacking compared to more rational numbers.

 

[Dana Pants]

Any particular reason not to flip the tires inside out?

You can (with the problems identified by Nightmaremoon), a tire shop might not. I vastly prefer directional tires vs tires that gave insides and outsides for exactly this reason.

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