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.

2024-02-13 Throttle Body Cable TO Drive by Wire

Q. What is the ruling on going the opposite way of the rule below?

Going from a cable TO a DBW.

4.7.3. Drive by Wire Throttle Bodies:
4.7.3.1. Engines originally equipped with a drive by wire throttle body may replace the OE
throttle body with a cable operated throttle body from any vehicle on the VPI list, as
long as the replacement throttle body has an equal or smaller flow diameter.


A. The rule only provides what it says, not the other way. Going from cable to fly by wire is + 25 points.. If paying engine swap points and the engine going in comes with fly by wire the throttle body is included.