Terms of Use

Last updated: October 16, 2026

What RaceCombo is

RaceCombo provides educational calculators, guides and organizational tools for drag racers. The site is operated as an independent publication. Contact: help@doogex.com.

Use of the tools

The free calculators and guides may be used for personal, non-commercial purposes. Results are estimates produced by published formulas, shown on each page. You are responsible for verifying any number you rely on against your manufacturers' data and your sanctioning body's rules before acting on it.

Paid products

Paid products (the Tuning System and racer packs) are digital tools delivered as web pages, purchased for a one-time payment through Stripe. Access is provided at a private page address shown after purchase; keep that address — it is your copy of the product. Products are licensed for your personal use; you may print worksheets and logs for your own use.

Your data

Tools on this site store the information you enter (combo, logs, worksheets) in your own browser's local storage. That data is not transmitted to us. Clearing your browser storage deletes it permanently; we cannot recover it.

Weather and track data

Live weather is provided by Open-Meteo and may be delayed or unavailable. Track elevations are compiled from published sources believed reliable at the time of publication; verify against official sources for sanctioning purposes.

Liability

Motorsport is inherently dangerous. Nothing on this site is a substitute for your sanctioning body's rulebook, your chassis and component manufacturers' specifications, or professional judgment. To the maximum extent permitted by law, RaceCombo is not liable for damages arising from use of these tools or reliance on their results.

Changes

We may update these terms; the current version will always be posted on this page with its date.