December Prelims

[PamRichardson]

Encourage all of you to read the prelims just posted on scca.com

Lots of changes for 2022.

Pam

[jimwheeler]

I didn't see anything in the December stuff. Where did you see something?

[Danny"TheKraken"Richardson]

AS
1. #30294 (ROGER EAGLETON) Proposed Revisions to SCCA GCR 2021 Appendix M, Part 2
Effective 03/01/2022 In SMG, Appendix M.2.j.1. Stock transmissions, make changes as follows:
"5 speed to run with 3.73 3.90 ratio rear end. Manufacture Motive Gear, PN F888390."
2. #31848 (American Sedan Committee) Rear coil over option for all vehicles
Effective 03/01/2022 In GCR, Section 9.1.6.D.4.b.1., change as follows:
"Springs of any origin may be used, provided they are of the same number and type as originally fitted and they must be
installed in the original location. Front suspension Ccoil over springs and shocks are prohibited, unless fitted as original
equipment. Rear spring relocation to the shock is permitted."
Effective 03/01/2022 In AS Spec Lines, Ford Mustang GT 5.0l (15-17) Restricted Preparation, change Notes as follows:
"Rear spring relocation to the shock is permitted."
SCCA Fastrack News January 2022 Page 12
3. #31849 (American Sedan Committee) Wheel rim width increase and commonality
Effective 03/01/2022 In GCR, Section 9.1.6.D.6.a.2., change as follows:
"Maximum wheel width is 8 inches,Maximum wheel width is restricted based on the following:
Vehicles with max tire size of 275mm, max rim width is 10 inches
Vehicles with max tire size of 295mm, max rim width is 11 inches
Vehicles with max tire size of 315mm, max rim width is 12 inches
Vehicles with max tire size of 335mm, max rim width is 13 inches
uUnless indicated within the vehicle specification line.
Effective 03/01/2022 In AS Spec Lines, change Notes as follows:
Cadillac CTS-V (04-07) Restricted Prep. 5.7L V8 (Aluminum block, Aluminum heads), LS6, 2 valves/cylinder Restricted Prep. 6.0L
V8 (Aluminum block, Aluminum heads), LS2, 2 valves/cylinder: "Max. Wheel Size: 18 x 9.5Dia. 18.0 inches"
Chevrolet/Pontiac Camaro & Firebird (93-02) Restricted Prep. 5.7L V-8 LT1 (Iron Block, Aluminum Heads) 2 valves per cylinder
5.7L V-8 LS1 (Aluminum Block, Aluminum Heads) 2 valves per cylinder: "Max. Wheel Size: 17 x 9."
Chevrolet Camaro (10-15): "Max wheel size 20 X 10.Dia, 20.0 inches"
Dodge Challenger (08-20) Restricted Preparation 5.7L, 6.1L, or 6.4L V8 (Iron block, Aluminum heads), 2 valves/cylinder: "Max.
Wheel Size 18 X 12.Dia. 20.0 inches"
Ford Mustang Cobra and GT 94-95 (Restricted Prep) 5.0 and 5.8 motor: "Max. Wheel Size: 17 x 9."
Ford Mustang including Cobra 96-04 (Restricted Prep) 4.6L two and four valve motor: "Max. Wheel Size: 17 x 9."
Ford Mustang Coupe GT (05-14) Restricted Prep. (Aluminum Block, Aluminum Heads) 4.6L/5spd 3 valves per cylinder 5.0L/6spd 4
valves per cylinder: "Max. Wheel Size: 18 X 10.Dia. 18.0 inches"
Ford Mustang GT 5.0l (15-17) Restricted Preparation: "Max. Wheel Size: 18 X 10.Dia. 18.0 inches"
Pontiac GTO (04-06) Restricted Prep. 2004, 5.7L V8(Aluminum Block, Aluminum heads), LS1, 2 valves per cylinder 05-06, 6.0L V8
(Aluminum Block, Aluminum heads), LS2, 2 valves per cylinder: "Max. Wheel Size: 17 x 9.5."
4. #31850 (American Sedan Committee) Move from tire exclusion list to tire inclusion list
Effective 04/01/2022 In GCR, Section 9.1.6.D.6.b.4., change as follows:
"American Sedans may not compete or qualify on Hoosier A7 compound tires effective 06/15/2021.American Sedans must
compete on DOT “R-type” road race tires. Permitted tires are listed below. Soft “A type” autocross tires are prohibited:
BFGoodrich R1 & R1S
Goodyear DOT radial DOT R or W compound
Hankook Ventus Z214 C51/Medium
Hoosier R7 or R6 or HWET
Kumho Ecsta V700
Nitto NT101
Toyo R888, Toyo Proxes RA1, or Proxes RR
Yokohama A048
Rain tires must continue to have DOT rating, except that softer compound dry tires, such as the Hoosier A7 (but not limited to),
are not permitted for use as rain tires.
SCCA Fastrack News January 2022 Page 13
The objective of this rule is to require the use of a more durable and economical tire. Performance of approved tires will be
monitored by the ASAC and those which are found to deviate from this objective may be subject to exclusion by means of a Tech
Bulletin or other appropriate communications.
Additional tires may be requested for consideration by the ASAC and may be introduced within rule change timing cadence."

Also head changes for regional racers

[mlanglin2007]

I suppose there are people who'd take the position that since I only race this class on a divisional level - and not 8 race weekends a year - that my opinion isn't particularly noteworthy. I've always done this at a level I can afford and tried to always remember that we race for $5 trophies. As a result, I've always been reluctant to spend a pile of money on my Fox Mustang, especially knowing the club's history of rules creep.

These rules changes are shocking, to say the least, to people like me. My observation is that every Fox Mustang in the class has just been promoted from "2nd tier AS car" to "Future Barn Find". In addition, the wheel manufacturers must be thrilled, what with likely several thousand wheels having been just obsoleted.

I am not well versed in the rules change process, but thought that something like this has to have a pretty significant "Comment/Feedback Leadtime", or am I wrong about that?

I suppose that the financial calculation is that the club figures that running off the few remaining Fox Mustangs and Gen3 Camaros will be made up with increasing numbers of later cars. I've had fun here, but I guess I'll move on to a class (likely, vintage racing) where my car won't be dangerously slow. Take care and good luck.

[mw85gt]

There are a lot of changes proposed in the December Prelims. The rear coil over rule makes sense to me, since it allows T2 to AS cross over for the modern Mustangs. I understand the logic for the alternate head rule, we need to have a replacement for the full prep Edelbrock heads that are out of production. The proposed change that makes absolutely no sense to me is the wheel size change. This rule change will force full prep teams to throw away 4-5 sets of 8" width rims and replace them with 10" width rims. The full prep cars that upgrade to the 10" rim should see better handling and lower lap times. I fail to see what this achieves other than making the full prep cars faster as a class and stimulating the economy. I plan to write letter to the CRB opposing the wheel size change.

[Tim White]

The wheel change was discussed at the Runoffs meeting with not much opposition, if any. I didn't envision it going to 10" though when it was being discussed. 9" for 275 and 9.5" for 295 seems sufficient to me.

[mw85gt]

The proposed wheel size changes in the Dec Prelims, (which I do not support) are provided below

Vehicles with max tire size of 275mm, max rim width is 10 inches
Vehicles with max tire size of 295mm, max rim width is 11 inches
Vehicles with max tire size of 315mm, max rim width is 12 inches
Vehicles with max tire size of 335mm, max rim width is 13 inches

[PamRichardson]

Yes, IMHO, there should be WDYTs again...

But write letters now, with your opinion one way or the other, Pam

[rx555]

Just because you can run bigger wheels doesn't mean you HAVE to. I never get the complaints on that stuff. Run what you got and if you want to go bigger, you can. Same complaints last year with the 13" rotors.
My wheels size for RP Fbody stayed the same at 17x9.
Is there really much performance advantage to the mid packer of bigger wheels and keeping the tire size the same?

[Tim White]

Originally Posted by rx555

Just because you can run bigger wheels doesn't mean you HAVE to. I never get the complaints on that stuff. Run what you got and if you want to go bigger, you can. Same complaints last year with the 13" rotors.
My wheels size for RP Fbody stayed the same at 17x9.
Is there really much performance advantage to the mid packer of bigger wheels and keeping the tire size the same?

Actually Curt, your wheel did change, the strike though doesn't copy. They removed the wheel size sentence from your spec line. Theoretically speaking a wider wheel should improve the contact patch.