Big advertisers don't trust their own ads. Before they call a campaign a win, they hold a group back. Some people see the ads. Some don't. Then they compare.
Most racers skip that step. We post the sponsor, tag the sponsor, thank the sponsor. Then we assume it worked. At renewal time, "I assume it worked" is a weak thing to say to someone holding a checkbook.
A logo on the car is a promise. A test is proof.
This is the kind of thing I work through with racers on a 1:1 Strategy Call: your sponsor, your channels, and a test you can actually run. But you can start the basic version today. Here's how.
Why "it probably worked" isn't proof
Researchers ran a test on about 500,000 new charity donors. Half got a thank-you call. Half didn't. Experts expected a big lift. The calls changed nothing. I wrote about that study in why thank-you calls don't keep racing supporters.
The lesson from it was simple. One of the researchers told nonprofits to test their own habits. Skip the calls for 10% of donors and see if anything changes.
That's a holdout test. Google's own lift studies work the same way. One group sees the ads. A control group is held back. The difference between the two is the part the ads actually caused.
You can't hold out people. Hold out weeks.
Here's the catch for racers. You can't split your sponsor's customers into two groups. You don't control who sees your Instagram.
But you do control when you push the sponsor. So hold out time instead.
- Give each sponsor their own tracked link. Google's free Campaign URL Builder adds tags to a link. Use the three it says to always use:
utm_source,utm_medium, andutm_campaign. If your sponsor uses Google Analytics, those visits show up in their own traffic report. Their numbers, not yours. - Add a code with their name on it. Clicks are nice. Sales are better. Ask the sponsor to tell you how many times it gets used.
- Pick one touchpoint to test. Say it's your race-week story posts. Leave everything else the same.
- Run "on" weeks and "dark" weeks. On weeks, you push the sponsor hard. Dark weeks, the link just sits in your bio. Alternate for at least four to six weeks.
- Write the plan down first. Then you can't fudge it later.
At the end, compare clicks and code uses for on weeks and dark weeks. If the on weeks win, you've got proof that the push works. If they don't, you just learned where to stop wasting effort.
Don't oversell small numbers
This part matters, so I'll be blunt. Grassroots numbers are small. Google warns that huge "lift" percentages show up easily when the control group has very few conversions.
Four clicks versus one click is not a 300% lift. It's three people. Report the raw counts, every time.
Also be honest about what you can't control. A race weekend, a holiday, or a sale at their shop can all bend one week. That's why you run several weeks, not one.
Report the zeros too. A racer who admits a post did nothing is a racer the sponsor believes when one works.
If you're stuck on the setup, this is a great use of a 1:1 Strategy Call. It's 60 minutes on your exact situation. We'll pick the right touchpoint, set up the links, and plan the weeks. You get a written action plan within 48 hours and 30 days of email follow-up.
Turn the result into your renewal pitch
Once you have even six weeks of data, your renewal meeting changes. You're not pitching exposure anymore. You're showing a report.
Something like this (example wording, not real data): "Race-week stories brought most of the clicks. The bio link alone brought very few. So next year I want to put more of your money into race-week content."
That's a racer who thinks like a marketer. Sponsors notice. It also builds on the basics in the three numbers sponsors want before your lap times and slots straight into the race recap you send after every weekend.
If you want the tools to keep score, The First Sponsor System includes a sponsor tracker and an ROI calculator built for this kind of reporting.
Where we stand
I'll be straight with you. LFR hasn't run a formal dark-week test for our own sponsors yet. I don't have a result of our own to show you. What I have is how the big advertisers prove their work, scaled down to a race car and a phone. We're adding it to our own reporting for 2027.
Prove it before they ask
Your sponsor will ask "did it work?" sooner or later. Have the answer ready.
Book a 1:1 Strategy Call and we'll build your test around your sponsor and your channels. You leave with the plan, the links, and the report format, ready before your next renewal talk.
Sources: Google Analytics Help — URL builders: collect campaign data with custom URLs, Google Ads Help — Understand your Conversion Lift based on users measurement data, The Chronicle of Philanthropy — "Thank-You Calls Show No Impact on Giving", Samek & Longfield, American Economic Journal: Applied Economics (2023). Verified as of October 2026. The dark-week method is my own scaled-down version of a holdout test, not a scientific study design. The renewal wording is an example, not real data. LeadFoot Racing has no customer, sales, or survey data in this post.
Do you believe?