ChampCar Endurance Series

ChampCar Tech Desk

Official channel for ChampCar technical questions, interpretations, and VPI requests.

Before you submit a ticket

The Tech Desk is for rules clarifications and technical questions. It is not a post race tech line, a place to protest results, or a place to fish for how other teams built their cars.

Most questions can be answered by reviewing the current BCCR Rulebook. Please read the applicable section before submitting a ticket.

If your question is already covered clearly in the BCCR, your ticket may simply be answered with a reference to the rulebook section.

VPI request checklist

For all Vehicle Performance Index (VPI) requests you must include:

  • Year, make, model, and trim level
  • Engine size and engine horsepower
  • Drive type: FWD, RWD, AWD, or 4x4
  • Transmission type: automatic or manual
  • Car weight and all factory options that affect performance
  • A link to the vehicle on automobile-catalog.com or another site with full specifications if it is not listed there

Requests that do not include all required info and research will be denied without review.

2023-02-25 - BMW E36 front chassis X-brace

Q.
Requesting ruling on BMW E36 front X-brace points. BMW has an OE part that replaces a single cross-bar between the front of the trans tunnel with a X-brace that also ties into the front subframe. I had teched the car w/ the x-brace installed in 2019 as material points, and tech at that time changed points to 0 due to it being a part installed on non-M E36s.

This part was installed on all convertible models (non-M3 'verts) since start of E36 production. Since there is no differentiation between coupe, sedan or convertible models on VPI line, I believe this is the reason for 0 points given at that time. RealOEM.com supports this, showing the part is applied to 92-99 E36s.

This brace was also added to the Light Weight special model of the 95/96 M3 (not on standard M3), and then added to all S52 powered M3s as well. It is generally now sold as a "M3 performance upgrade part" (while in reality, it started as a convertible part which was later added to M3s).

What is tech's current ruling for this part? Is it 0 points due to it being a part on a vehicle that is within the E36 M50B25 VPI line? Or is it material points since it is only a convertible part, and my car is a coupe?

For reference, the added material for the x-brace consists of:
25" long 1" OD tube
24" long 1" OD tube
11" long 0.5" OD tube
8" long 0.5" OD tube
5"x3" mounting plate
5.5" x 3" mounting plate
1"x1.5" brace plate
2.5"x2.5" brace plate
(I'm coming up w/ 95 sq inches / .066 sq ft of material)

A.
You cannot pick and use parts across the platform years to build a car that was not ever mass produced that way. You cannot use specific convertible parts for no point add. As far as point value if it is a cross brace between or close to suspension mounting points it will carry the 10 point strut or subframe value. If not then material points should be added.

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