As our 2010 Mazda MX-5 autocross project continues to evolve, we’ve been hard at work on Project STR, installing and testing suspension components and adding some go-fast graphics.
We’ve also tried to answer the question about what tire and wheel size produces the quickest lap times. One thing we did confirm is that what feels good isn’t always fast, and what’s fast doesn’t always feel good. The MX-5 has been a great test bed to find out what fits, and what works. A full report will appear in the next issue of Grassroots Motorsports magazine.
Meanwhile, the battle for the top positions in the SCCA’s Street Touring Roadster class are turning out to be intense, with just a few tenths of a second separating the trophy positions at most SCCA National level events this season. The Toledo ProSolo was no exception with the margin of victory for Project STR driver Chris Harvey coming in at a scant .087 seconds over runner-up Jason Wong in his well-prepped Honda S2000. Just .389 seconds back was David Corsaro, piloting his Honda S2000 CR to third place.
Along with finding ways to make the car go faster, another fundamental part of this project is keeping the car streetable. To that end, our driver, Chris Harvey, drove 250 miles to and from the event on the same Dunlop Direzza Sport Z1 Star Spec tires and Kosei K1TS wheels he raced on—just like we did for the Peru National Tour two weeks earlier. No tire change at the event was needed. The rest of our gear for the weekend was packed into the car. Chris’s only complaint: what to do with all of his spare time at the event. Could going fast get any easier?