Proposed Rules Clarifications

[Greg Amy]

This month's submissions...

Re-wording, Ride Height

Current rule 9.1.4.F.5 "Chassis":

Minimum ride height is 3.0 inches for STO, 4.0 inches for STU and 5.0 inches for STL. Ride height will be measured at the lowest point of the rocker panel, not including the pinch weld.

Change 9.1.4.F.5 to read:
Ride height will be measured at the lowest point of the rocker panel, not including the pinch weld.

Add 9.1.4.1.C.5 (STO)
Minimum ride height is 3.0 inches.

9.1.4.2 (STU) Insert new Sub-Section letter prior to "Engines", labeled "Chassis". This will be Section "C" if the aero re-wording goes into effect prior to this change.

Add 9.1.4.2.C.1 (STU)
Minimum ride height is 4.0 inches.

9.1.4.3 (STL) Insert new Sub-Section letter prior to "Engines", labeled "Chassis". This will be Section "C" if the aero re-wording goes into effect prior to this change.

Add 9.1.4.3.C.1 (STL)
Minimum ride height is 5.0 inches.

[Greg Amy]

Re-wording - Dry Sumps

Current rule 9.1.4.J.4, "Dry Sump Systems":

4. Dry-sump systems:
STO:
The dry-sump system is limited 5 stages. It shall consist of 1 pressure stage and a maximum of 4 scavenge stages. If the OEMstyle pressure pump is used it shall count as the one permitted pressure stage. There may be a maximum of 2 two-port scavenge stages, or a maximum of 4 single-port scavenge stages, or any combination such that oil is not being scavenged from more than a maximum of 4 locations.
STU:
The dry-sump system is limited to 3 stages. It shall consist of 1 pressure stage and a maximum of 2 scavenge stages. If the OEMstyle pressure pump is used it shall count as the one permitted pressure stage. There may be a maximum of 1 two-port scavenge stage, or a maximum of 2 single-port scavenge stages, such that oil is not being scavenged from more than a maximum of 2 locations.
STL:
Dry sump systems are not permitted.

Delete 9.1.4.J.4 entirely.

Add 9.1.4.1.D.6 ("STO, Engine"):

Dry sump systems are allowed. The dry-sump system is limited 5 stages. It shall consist of 1 pressure stage and a maximum of 4 scavenge stages. If the OEM style pressure pump is used it shall count as the one permitted pressure stage. There may be a maximum of 2 two-port scavenge stages, or a maximum of 4 single-port scavenge stages, or any combination such that oil is not being scavenged from more than a maximum of 4 locations.

Add 9.1.4.2.B.5 ("STU, Engines"):

Dry sump systems are allowed. The dry-sump system is limited to 3 stages. It shall consist of 1 pressure stage and a maximum of 2 scavenge stages. If the OEM style pressure pump is used it shall count as the one permitted pressure stage. There may be a maximum of 1 two-port scavenge stage, or a maximum of 2 single-port scavenge stages, such that oil is not being scavenged from more than a maximum of 2 locations.

Add 9.1.4.3, STL, no addition required, as dry sump systems are not allowed.


PLEASE NOTE: The section letters for "Engines" may/will change based on prior re-verbiage approvals. The section letters used above are relfective of the July 2011 issue of the GCR.

[Greg Amy]

Re-wording - Suspension Pickup Points

Existing rule 9.1.4.N.2, "Suspension and Steering"

2. STO and STU original suspension pick-up points below the upper line of the wheel rim must be used within a tolerance of 1.0 inch; however, if the lower suspension pickup point is changed from the OEM location, 50 lbs. must be added to the car. STL cars must retain the OEM lower suspension pickup points. The body/frame around the pick-up points may be reinforced. This reinforcement shall be limited to a radius of 6.0 inches. The 1.0 inch tolerance applies to pick-up points on the chassis only.


Changes:

Delete the sentence "STL cars must retain the OEM lower suspension pickup points."

9.1.4.1, STO, Add Section "Suspension and Steering" prior to "F. Brakes"

Add to that above 9.1.4.1.x section "suspension and Steering:

1. Original suspension pick-up points below the upper line of the wheel rim must be used within a tolerance of 1.0 inch; however, if the lower suspension pickup point is changed from the OEM location, 50 lbs. must be added to the car. The body/frame around the pick-up points may be reinforced; this reinforcement shall be limited to a radius of 6.0 inches. The 1.0 inch tolerance applies to pick-up points on the chassis only.

9.1.4.2, STU, Add to 9.1.4.2.D, in existing "Suspension and Steering" section:

3. Original suspension pick-up points below the upper line of the wheel rim must be used within a tolerance of 1.0 inch; however, if the lower suspension pickup point is changed from the OEM location, 50 lbs. must be added to the car. The body/frame around the pick-up points may be reinforced; this reinforcement shall be limited to a radius of 6.0 inches. The 1.0 inch tolerance applies to pick-up points on the chassis only.

No change needed in STL.

Existing rule 9.1.4.N.3, "Suspension and Steering"

3. STO and STU suspension mounting points above the upper line of the wheel rim must be retained within a tolerance of 3.0 inches, however, the body/frame around the pick-up points may be reinforced. This reinforcement shall be limited to a radius of 6.0 inches. The 3.0 inch tolerance applies to pick-up points on chassis only. STL cars must retain the OEM upper suspension mounting points.


Changes:

Delete sentence "STL cars must retain the OEM upper suspension mounting points."

Add to the above-new section in STO, "Suspension and Steering"

2. Suspension mounting points above the upper line of the wheel rim must be retained within a tolerance of 3.0 inches, however, the body/frame around the pick-up points may be reinforced; this reinforcement shall be limited to a radius of 6.0 inches. The 3.0 inch tolerance applies to pick-up points on chassis only.

9.1.4.2, STU, Add to 9.1.4.2.D, in existing "Suspension and Steering" section:

4. Suspension mounting points above the upper line of the wheel rim must be retained within a tolerance of 3.0 inches, however, the body/frame around the pick-up points may be reinforced; this reinforcement shall be limited to a radius of 6.0 inches. The 3.0 inch tolerance applies to pick-up points on chassis only.

No change needed in STL.

[mossaidis]

Change 9.1.4.F.5 to read:
Ride height will be measured at the lowest point of the rocker panel, not including the pinch weld.

No mention of exhaust?

[Greg Amy]

No mention of exhaust?

That ride height requirement - which caused me to lose a qually session at the Runoffs last year 'cause my ITS exhaust was too low - was changed with the 2011 rules (before I joined the STAC). Whereas before ride height was 3" across the whole bottom of the car, now ride height is measured at the rocker.

GA

[benspeed]

Greg - keep after it and you'll have the tighest/clearest class ruleset in the GCR!

Question, It appears that the 968 turbo was only a Euro model and it never came with a 2.5L turbo. Can the car still be classed in STU with turbo or is it a better approach to request a supercharger be permitted on the Porsche 968?

Still looking at STU as the next class up for the car.

Thanks

[Chip42]

good work, Greg.

on the upper suspension mount rules - take out "however" and replace it with a period.

[Greg Amy]

....take out "however" and replace it with a period.

Noted, thanks.

Greg - keep after it and you'll have the tighest/clearest class ruleset in the GCR!

Hmmm, a satisfied customer. No worries, we'll address that next concall.

Question, It appears that the 968 turbo was only a Euro model and it never came with a 2.5L turbo. Can the car still be classed in STU with turbo or is it a better approach to request a supercharger be permitted on the Porsche 968?

Right now we do not have "opportunity" (read: allowance in the rules/philosophy) to allow additions of turbos/SCs to cars that did not come from the factory that way (except in STO; see Acura NSX). There is discussion about allowing such beasts with spec'd TIRs, but I don't see that coming short-term. We are trying very hard to reign in the World Challenge cars so that they have a place to play but are not "the" cars to have, so I encourage you to consider doing a STU-to-the-rules build and see what comes of it...2750# for a built 2.5L is pretty attractive versus an Acura TSX WCT 2.4L car at 3,045 piggies...300 hundred pounds more...

GA

[benspeed]

Thanks Greg - appreciate the clarifications. Figure I still have a couple ITR seasons left, but do have the desire to run nationals and stick with the 968.