AutoX class question

[burningchrome]

I'm running 265/40-18 Michelin PS4S on 18x9.5 wheels. No suspension mods (yet). Does this drop me all the way into SM?

I'm a casual AutoXer, so my wheel/tire choice is more about aesthetics.

 

[Lunares]

Casually will anyone care? No

With no mods, running wider wheels than stock puts you into ASP (for a P3D). But if you run in BS highly doubt anyone will challenge. You can run 265-35-19 tires on a 19x8.5 wheel and that's allowed. Maybe if you go to nationals someone will care.

If you want to do suspension mods, most mods for sale involve spherical bearings and that will drop you into SM.

 

[SD_Engnr]

Casually will anyone care? No

With no mods, running wider wheels than stock puts you into ASP (for a P3D). But if you run in BS highly doubt anyone will challenge. You can run 265-35-19 tires on a 19x8.5 wheel and that's allowed. Maybe if you go to nationals someone will care.

If you want to do suspension mods, most mods for sale involve spherical bearings and that will drop you into SM.

What he ^ said.

 

[burningchrome]

Thanks! I don't want to be that guy though. I just want to be right.

 

[usofrob]

I found they don't care until you're beating them. Last year I just said I was in STU, because that seems like where it *should* go with just wider wheels. (I was only running 235 wide tires, and I still go dirty looks in BS)

 

[SD_Engnr]

Thanks! I don't want to be that guy though. I just want to be right.

Likewise, so I just did X runs, or practice days. Next year I'll run ASP unless I think I'll be called out. Otherwise, it's SM and that's going to be tough!

 

[Lunares]

Likewise, so I just did X runs, or practice days. Next year I'll run ASP unless I think I'll be called out. Otherwise, it's SM and that's going to be tough!

Honestly, SM and ASP have almost the same PAX. I dont think the competition is really that different. We wont be competitive in either class without hoosiers anyway!

 

[ItsMeOK]

Man, I am still confused on this, maybe just me but if not we could sure use a step by step what common improvements are allowed and the class line that we cross when doing the next.

For example, please correct as I don't know and this is a wild guess. Add other popular upgrades too.

B Street
Stock Performance 3 with PUP and 20" sport wheels (20X8.5" Front / Rear +35 offset) 235/35 20 Tires (has to stay 200 UTQG treadwear)
Wheel width can't change
Change to 18" or 19"?
Change up to 265/X?
Change up to XXX/40?
Change brake lines to stainless steel
Change brake fluid
Change brake pads to track or street /track ? Any limit?

A Street Prepared (Now I am not sure where the spherical bearings come in on these products or which, all, etc. are counted)
Change to MPP Sport Coilovers
Change to MMP Rear Toe arms
Change to MPP Rear Camber arms
Change to MPP Front Upper Control Arms

Street Modified
Change to MPP Rear Trailing Arm
Change to MPP Rear Traction Arm
Change to MPP Front Lower Control Arm Bearing
UP Front or Rear Sway Bar

 

[ItsMeOK]

Can't seem to edit but I forgot that I don't think you can change the offset either

 

[SD_Engnr]

Man, I am still confused on this, maybe just me but if not we could sure use a step by step what common improvements are allowed and the class line that we cross when doing the next.

For example, please correct as I don't know and this is a wild guess. Add other popular upgrades too.

B Street
Stock Performance 3 with PUP and 20" sport wheels (20X8.5" Front / Rear +35 offset) 235/35 20 Tires (has to stay 200 UTQG treadwear)
Wheel width can't change
Change to 18" or 19"? 19" based on only being able to go down 1 size. Offset must be within +/-7mm.
Change up to 265/X? Can do any size that fits without modification
Change up to XXX/40?
Change brake lines to stainless steel Yes
Change brake fluid
Change brake pads to track or street /track ? Any limit? Any material can be used.
A single sway bar can be removed or upgraded.

A Street Prepared (Now I am not sure where the spherical bearings come in on these products or which, all, etc. are counted)
You can run upgraded rotors, and calipers as long as they are the equal to or greater than stock size.
F/R upgraded sway bars are allowed.
Any change to MPP components (or anything currently available) will bump you out of this class because they contain spherical bearings.

Street Modified
This is likely where most of us with aftermarket parts will end up. Almost all mods are allowed, with the exceptions that are spelled out.

 

[Shake Shinde]

Is it true that you can legally run 0.5" wider wheels in BS? If so, 18x9" should work with 265mm tires.

 

[SD_Engnr]

Is it true that you can legally run 0.5" wider wheels in BS? If so, 18x9" should work with 265mm tires.

No. Cannot go wider on the wheel. Reference section 13.4.

 

[ItsMeOK]

Thanks SD_Engnr
Much clearer now.
Guess it's SM then

 

[ItsMeOK]

Change to 18" or 19"? 19" based on only being able to go down 1 size.

I think you could get one with 19" too so maybe ok to go down 1 to 18"


Edit
Nope just checked have to have 20" if performance but if other trim models have 19 or 18 would 18 be allowed?

 

[Lunares]

Change to 18" or 19"? 19" based on only being able to go down 1 size.

I think you could get one with 19" too so maybe ok to go down 1 to 18"


Edit
Nope just checked have to have 20" if performance but if other trim models have 19 or 18 would 18 be allowed?

Correct, if you are racing a P3D stealth or non P3D you would be allowed to use 17, 18, 19 or 20. P3D+ can only use 19, 20 or 21

 

[SD_Engnr]

Change to 18" or 19"? 19" based on only being able to go down 1 size.

I think you could get one with 19" too so maybe ok to go down 1 to 18"


Edit
Nope just checked have to have 20" if performance but if other trim models have 19 or 18 would 18 be allowed?

Unless you are repeatedly winning the class, and you are protested by someone in the know, I doubt you'll have issues running 18" on the Performance 3 with performance upgrade package.