Does anyone have spec settings to change from factory 'track' alignment to a more street friendly alignment?
Thanks in advance for any help.

 

Exactly what are you asking for? There is a factory track alignment recommendation for the C7s but it has to be applied by the owner. The car doesn't get delivered with that setting. My 2015 Z06/Z07 was delivered with -1.2 degree camber at all 4 corners. I assume others were delivered with similar specs. Factory specs are shown in this picture:



FE1 through FE4 settings are for the base Stingray and the Z51 while FE6 and FE7 are for the Z06 and the Z06/Z07.

As you can see the factory settings are as wide as a barn door with a plus or minus .6 degrees in camber to choose from. A streetable camber setting would be in the range of -.6 degrees so you may already have that. If the inside of your front tires are wearing I would look at the toe in specs. GM recommends plus .1 degree of toe in but there is a tolerance of plus or minus .2 degrees. You could have a toe out up to -.1. I believe having some toe in is better for the street since it reduces pulling from side to side so you should be looking for plus .05 degree toe in.

If you want more streetable numbers than the car has now you could go with this:

Front Camber -.6 to -.8 degrees Looking at the specs you will notice the factory wants more camber on the right front but when you factor in the tolerances and the green zone settings on an alignment machine you could have exactly the opposite if you have a mechanic that just goes for green and done. One alignment machine that a dealer had allowed the mechanic to input my specs and tolerances and revise the green range which helped him get what I wanted.

Front Caster + 7.4 to +8.0

Front Cross Camber and Cross Caster as small as they can get it although a good alignment guy can play with the camber and caster from side to side to get the car to steer straight on a crowned road.

Front toe +.05 of Total Toe In (make sure they know you want Toe In as there is confusion on the plus or minus sign and which sign is Toe In or Toe Out).

Rear Camber -.5 to -.8

Rear Caster +.8

Rear toe +.05 Total Toe In

Thrust angle as close to zero as possible

You may already be close to these settings but if you are looking at max tire wear then I think these would get it for you.

Bill

 

thanks, Bill, exactly what I wanted and you have described my issue
spot on

 

I am interested in why you would suggest a rear caster setting of +.8 rather than the GM target setting of 0.0 ... what is your reason for this?

Thanks Clive

 

There is another thread on this subject and at this point based on reports and some testing by several heavy duty track people the best setting is +.8. GM indicates 0.0 + or - .8 so the +.8 is within their range. It may be that setting works better with the -2.0 camber setting recommended for the track which is a little beyond the FSM range for rear camber. Here is a link to a page in the thread: https://www.corvetteforum.com/forums...post1592779369

Bill

 

^^^^^^

Like Bill says, +0.8° for rear caster is within the factory specs, and some of the C7 track hounds have found that a slightly positive rear caster apparently gives a better "toe curve" - the change in toe with suspension compression/rebound.

I think a very important rear caster concern is that both sides be adjusted the same!!!

Make sure that whom ever does your alignment checks the rear caster, adjusts it to whatever you ask them to set, gives you a readout of what it is, and that it's the same both sides.

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