Alignment ??
Thread Starter
Racer
Joined: Sep 2012
Posts: 395
Likes: 52
From: East Tennessee
Alignment ??
Going to the local dealer in the morning for alignment after putting on a set of Firestones today. My question is should I take the PFADT specs or let them use factory specs. Just looking for good even tire wear. The front tires I replaced were worn on the inside, although the right more than the left.
These are the specs I found searching the forum.
https://www.dropbox.com/s/9q85na7tvv...ions.docx?dl=0
These are the specs I found searching the forum.
https://www.dropbox.com/s/9q85na7tvv...ions.docx?dl=0
Safety Car
Joined: Nov 1999
Posts: 4,287
Likes: 1,157
From: Green and Wet Western Oregon
2023 C7 of the Year Winner - Unmodified
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You don't tell us if you are driving a base, Grand Sport or ZO6. I cannot speak for the base model, but an alignment to Pfadt street specs greatly improved tire wear on our Grand Sport.
Instructor
Joined: Sep 2014
Posts: 179
Likes: 5
From: Clarksville Tennessee
Going to the local dealer in the morning for alignment after putting on a set of Firestones today. My question is should I take the PFADT specs or let them use factory specs. Just looking for good even tire wear. The front tires I replaced were worn on the inside, although the right more than the left.
These are the specs I found searching the forum.
https://www.dropbox.com/s/9q85na7tvv...ions.docx?dl=0
These are the specs I found searching the forum.
https://www.dropbox.com/s/9q85na7tvv...ions.docx?dl=0
I would take the PFADT specs with you, factory specs are for the track. I would however call the dealer to ensure that they will set it up that way, if not, find a good shop that will. If they will show you, see how the car is setting with the factory specs and then compare the numbers at the end. Try and get a print out of before and after if you can.
Le Mans Master
Joined: Sep 2014
Posts: 7,001
Likes: 988
From: lake havasu city arizona
This shows the print out of my recently done alignment by the only shop in this Podunk town, Chevy dealer.
For what its worth
https://www.corvetteforum.com/forums...ent-specs.html
NSF
For what its worth
https://www.corvetteforum.com/forums...ent-specs.html
NSF
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
Use this sheet instead (no wiggle room),
http://www.pfadtracing.com/docs/camb...t-settings.pdf
If the insides are worn out, and the middle and outer edges not, then go with the pure street alignment instead of even the factory alignment specs.
The factory alignment is semi aggressive for track/street, and you are not pushing the car hard enough to get a evenly wear the tires with even the factory alignment.
Also add, there is a steering wheel sensor in the car (accessed/read through the OBDII port), so when they aligning, the should be zeroing out on the wheel sensor at zero too (not just looking at the steering wheel and guessing if it centered of not).
Lastly with the amount of adjustments on the vet for all 4 wheels, it does take some time to get it all right. 30 to 45 mins is the norm to have a zero steering wheel/alignments print read out all correct. If they can not get it right, or tell you that there is not way to get the alignement to the specs per the above link, find another shop.
Not only is there the standard adjustments on the bottom end points, but spacer shim in the upper A arms if you run out of adjustments on the standard lower adjustment points to get the car to align correctly.
http://www.pfadtracing.com/docs/camb...t-settings.pdf
If the insides are worn out, and the middle and outer edges not, then go with the pure street alignment instead of even the factory alignment specs.
The factory alignment is semi aggressive for track/street, and you are not pushing the car hard enough to get a evenly wear the tires with even the factory alignment.
Also add, there is a steering wheel sensor in the car (accessed/read through the OBDII port), so when they aligning, the should be zeroing out on the wheel sensor at zero too (not just looking at the steering wheel and guessing if it centered of not).
Lastly with the amount of adjustments on the vet for all 4 wheels, it does take some time to get it all right. 30 to 45 mins is the norm to have a zero steering wheel/alignments print read out all correct. If they can not get it right, or tell you that there is not way to get the alignement to the specs per the above link, find another shop.
Not only is there the standard adjustments on the bottom end points, but spacer shim in the upper A arms if you run out of adjustments on the standard lower adjustment points to get the car to align correctly.
Team Owner
Joined: Mar 2007
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From: Right Corner Pocket of Illinois
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I think the issue is the tolerances. You can be in “spec” but be far to one side or the other of nominal. I would take the PHAT recommendation but try to have your technician “nail it”.
Race Director
Joined: Oct 2007
Posts: 11,367
Likes: 211
From: Edgewood Washington
St. Jude Donor '11-'12-'13-'14-'15
GM allows for a wide variation of settings to meet their acceptable spec.
Some Dealers will use this to just get it close and then say it meets specs.
You need to have the Tech take the time to get the numbers spot on and using the PFADT street/track settings will give you the good handling/tire wear you're after.
Some Dealers will use this to just get it close and then say it meets specs.
You need to have the Tech take the time to get the numbers spot on and using the PFADT street/track settings will give you the good handling/tire wear you're after.
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