RE71R - Competition Tire Pressures - Track and Autoslalom

[Dave_W]

In F Street I was using 285 RE71Rs on 19x9 front and 19x9.5 rears (Boss 302), with pressures about the same as DaveW at the start of a run. For a day in the low- to mid-60s, I'd be on the lower end of the range (32F/28R), hoping to work the tire carcass a bit more to build heat through the run. Because of the narrower front wheel, I liked to use a few pounds more to help turn-in feel. Only mod at the time was the StranoParts 8419 1" hollow rear bar, I think middle hole (so 185 lb/in vs Boss 250 lb/in).

Autocross in the low 60s temps are getting marginal for R-comps, including the fast 200TW tires. Here in New England, March and November events can be pretty interesting. A couple years ago, the forecast called for a high in the low 50s and light rain. I ran my daily driver Fiesta ST on snow tires in HS and was holding raw FTD until the afternoon when the rain let up and a 2-driver AWD Street Mod on Hoosiers got me.

 

[Dennis DiLucente]

In response to request for additional RE71R Track Tire Pressures I offer the following:

Just ran two days @ Auto Club ROVAL while enjoying low-mid 70 degree sunshine & overnight temps in the low 50's. Our 2012 Boss was equipped with brand new RE71s (save for approx. 100 miles driving to the track) mounted on 19 x 10 inch HRE rims (squared set-up). The alignment specs were set to -3 Camber; 7.4 Caster and .0625 Toe-in. Suspension mods that could impact tire performance included Steeda Boss 302 Perf. Lowing Springs as well as Koni Yellow Shocks & Struts.

I used an initial Cold Tire Pressures setting of 26.5 psi on the LF/LR/RR & 27psi on the RF all day long. Hot Tire Pressures immediately upon re-entering the Paddock were 32-33psi. The RE71s performed flawlessly and generally ran consistent Inside/Middle/Outside tire temperatures all day using a IR gun.

This set-up yielded competitive competitive Lap (Time Thread) times (Race Hero) of 1:54s both days. Interestingly enough, the faster times occurred on both the 1st and the 6th/7th laps of morning as well as afternoon sessions which diminishes, to me, comments about RE71s getting greasy after they heat up a bit.