Has anyone found 18" wheels that fit PP in stock width/offset?

[Anthony@HTM]

I don't have anything that's made with stock widths and offsets. I could probably verify a set of Forged wheels for the application that it's needed for, but of course the question really is, why not go larger in width [MENTION=22788]Cindy42[/MENTION]? Do you need a specific size because of autocross restricts the sizing for your class?

Missed the part about stock width!

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[FlowForm_Wheels]

Missed the part about stock width!

Yeah that makes it a real tough one. I'd say that 99.9999% of the aftermarket wheels in the industry aren't made in same width/offset as factory because there's just too much to improve upon when it comes to fitment from the factory as well as the opportunity to run much wider tires.

 

[Cindy42]

Yes, it would be easier to find a wider selection and even more affordable wheels if Stock class rules were not involved. Rules now allow to go up or down 1" (this is new in the last few years), but width has to be the same and offset has to be within .25" I believe is the number. Having the stagger really kinda stinks as I'd like to be square and rotate. Moving to another class is always an option, but usually turns into a spending competition. I have 2 small kids, not enough free cashflow. ;)

 

[Whiskey11]

I know at least one credible driver trying out 18s, with an eye toward treating third gear as the new second gear. (Frankly, if it appears to work, I may try it myself.)

Having seen this thrust chart, I don't see it ending well for a GT/PP. Like I said, it has barely more thrust in the upper RPM range than a Shelby GT and down low it loses a lot to even the coyote powered S197's and the new Camaro. Tom and I went back and forth on this up until the thrust chart came out and that pretty much confirmed what he believed to be true: Not enough grunt to justify going shorter to avoid shifting and not short enough to make the car come out of digs without the downshift anyway. At that point you are better off using the common 19" sizes (which only loses a mph and change in 275 form and none in 285 form) and shifting to third when you need it and enjoying the absolutely epic power and torque coming off the corner.

I'll admit though, I did not look at the Ecoboost Mustangs. The key here being the 3.73 rear gears and the MT82 transmission with a 7k RPM redline and 6800 fuel cut.

 

[DickR]

Cindy - Welcome to the S550 GT PP FS club! For an extra set of wheels you might check with Chris Cox in California to see if any of his FS legal wheels are for sale since he is now in STP. I got my Forgestar wheels through Sam Strano with lead times of at least six weeks.

Regarding speeds in gears my car hits the rev limiter at about 6800 rpm and will hold pretty close to there on the limiter.

Note that there is now a 265/40x19 RE-71R that is about 2 mph faster at redline than the 275/35x19 but is also about 3/4 inch narrower tread per Tire Rack specs. The cost is significantly lower however.

 

[Cindy42]

Good to see you DickR! Will you be at Wilmington Pro? I have some 265/35/19's that I just bought for my 2013, so I need to use them up first before I change. I have an extra set of stock wheels for now, but I definitely am trying to figure out the best combination for when I can start purchasing. Are your Forgestars 19"?

 

[DickR]

Good to see you DickR! Will you be at Wilmington Pro? I have some 265/35/19's that I just bought for my 2013, so I need to use them up first before I change. I have an extra set of stock wheels for now, but I definitely am trying to figure out the best combination for when I can start purchasing. Are your Forgestars 19"?

Cindy. Yes to both questions.

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[RocketGuy3]

Yes, what Dennis said. Bonus is saving 12lbs per front tire/wheel and 15lbs per rear. Took about 10 weeks to get. I ordered through Howey Industries. Tires are a full 2 inches shorter. Doesn't look quite as silly as I thought it would.

Nice, have any pics from other angles?

Just a bit of a drop, and that could actually look pretty good.

 

[NightmareMoon]

So thrust chart... I get that banking to stay in 3rd won't pay off with the GT V8, 2nd is where the torque is at.

But are we only talking a couple mph difference between the rev limiter in 2nd with 18s vs 19s?

I mean if it's only +2mph without shifting then it doesn't seem like a big deal. Some course designs I guess you'd need to shift where you didn't need to before, but what percentage of courses is a difference from 18s to 19s going to actually come into play? Often if you need to shift with the 18s, you'd also need to shift with 19s, right?

I've done a few local events with the stang and a couple years a while back in other cars. No experience with nationals, so just trying to understand the perspective (and plan my own wheel-tire setup)

 

[jpaulson]

Nice, have any pics from other angles?

Just a bit of a drop, and that could actually look pretty good.

That's the only pic I have for now. I'll take some at the next event to post up.

 

[jpaulson]

So thrust chart... I get that banking to stay in 3rd won't pay off with the GT V8, 2nd is where the torque is at.

But are we only talking a couple mph difference between the rev limiter in 2nd with 18s vs 19s?

I mean if it's only +2mph without shifting then it doesn't seem like a big deal. Some course designs I guess you'd need to shift where you didn't need to before, but what percentage of courses is a difference from 18s to 19s going to actually come into play? Often if you need to shift with the 18s, you'd also need to shift with 19s, right?

I've done a few local events with the stang and a couple years a while back in other cars. No experience with nationals, so just trying to understand the perspective (and plan my own wheel-tire setup)

I believe the difference will be between 3 and 4mph in 2nd gear. At the lot I run the most, Packwood, I would say that 80% of the courses have one or two sections that require 60 plus mph. On short 19's, this requires a shift or an extended period on the limiter at least. I figure that I will have to shift anyway. My thought is that the gearing advantage of the 18's makes 3rd more usable and may provide more options on when/where to shift.

I could be all wrong, but I've never been the guy that does what everyone else does.

 

[jpaulson]

Cindy - Welcome to the S550 GT PP FS club! For an extra set of wheels you might check with Chris Cox in California to see if any of his FS legal wheels are for sale since he is now in STP. I got my Forgestar wheels through Sam Strano with lead times of at least six weeks.

Regarding speeds in gears my car hits the rev limiter at about 6800 rpm and will hold pretty close to there on the limiter.

Note that there is now a 265/40x19 RE-71R that is about 2 mph faster at redline than the 275/35x19 but is also about 3/4 inch narrower tread per Tire Rack specs. The cost is significantly lower however.

They also have a 265 45 18 that is just about the same height as the oem's at 27.7 inches tall. These will be my plan B if the shorter tires don't work out.


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[Cindy42]

DickR and JPaulson, does this car have a camber bolt procedure in the FSM like the previous generation?? What are you doing for alignment?

 

[jpaulson]

DickR and JPaulson, does this car have a camber bolt procedure in the FSM like the previous generation?? What are you doing for alignment?

You are allowed to slot the upper strut hole up to 2mm. I don't have the file handy but I'm pretty sure it's in this thread somewhere. Shoild get you between 2.2 and 2.5 dregrees of negative camber.

I have only a handful of runs in car so far on oem pirellis. I am starting with zero toe in front and slight toe in the rear. Car came with about 1.2 degrees negative camber in back so I left it as is for now.


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[Impulsed7]

http://www.apexraceparts.com/apex-products/S550-Mustang/#.Vv1BqvkrJD8

In case you needed stock widths, not sure about offset here, but they fit over pp brakes. BMW guys love these, and they are incredibly durable.

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