I'm sure that it's been posted here thousands of times. I did a search and I'm still not sure what I should be at. Here is the deal:

I have a 2004 sedan on regular suspension. I installed the sedan sports suspension and the Z/Coupe spring setup. I also purchased OEM 18" wheels and have 245/40/18 tires.

That being said, when I get the lifetime alingment from Firestone, do I have them align it to the stock 04 sedan specs? Thanks for the help.

 

Found some info talking about using the coupe specs when you lower the car. Should I use the coupe numbers from the same year? Anyone...

 

So what did you finally do? How did the wear go? Do you still have this car? This setup?

 

OEM misAlignment specs are only for a brand new vehicle with new rubber bushings. Any change in rideheight will require a new development of alignment numbers.

After lowering [or raising] methods must be developed to correct camber gain curves and toe bump steer curves.

Things people selling springs forget to tell you!

 

You can only get just so much correction without camber kits anyway. I just told Firstone to get it as close as they could and it's real close to stock. I have like 1.2 deg of camber in the back and stock in the front. Toe can be set just fine. I have no tire wear issues, just a slight bit of extra wear on the insides. Rotation helps with that.

 

What springs and how much drop are you working with?

 

Unrevised 350Z springs which give about an inch of drop.







The back sits a bit lower than the front and I have two rear coupe springs I haven't put in yet.

 

How much are dealers charging for an alignment these days? Do they do the rear and the front wheels? What can they do to the rears? Are there toe adjustments back there?

 

I think Firestone is approx $70 for a one time "4 wheel" alignment and they have a "Lifetime" for $130. Yes there is adjustment in the back. Toe can be corrected (it WILL be off after lowering) and so are several other parameters.