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Time for a new helmet. I'm replacing my SA2000 Bell M2. I'm looking at the Bell M4 for around $380 and the G-Force Pro Eliminator for around $250. Any quantifiable differences for the significant cost difference? What are people's feelings on the price difference vs. ability to protect vs...

I think I'll store my IT-A Rx-7 outside this winter, probably on its open trailer. I'm in Colorado - winter ranges from -20F to 70F, relatively dry. I drained the coolant, disconnected the battery, it's on scrap tires, loosened the tie downs, and has a good quality car cover. Anything else...

Anyone have reasonably accurate info on how many amateur/club road-racing drivers there are in the USA these days? I suspect there's lots of crossover between SCCA, NASA, marque clubs, vintage, track days, etc. Not looking for circle track, drag, off-road, etc. I'm just curious to get a feel...

Finally got some good racetrack video up on YouTube! (Watch it in 480p.) Pueblo Motorsports Park, running HPDE4/TT with NASA. Why did the car suddenly spin? I'm wondering if it is the famed Rx-7 snap oversteer from a binding rear suspension - except in all three spins the rears lock well after...

My 1985 IT-A Rx-7 has the 4.77 Limited Slip from the front of a Kia Sportage. Ran the car this weekend and it seems to have started "howling" - sorry I don't have a better way to describe it. Diff had Mobil1 75-90 LS GL-5 gear oil in it with less than five hours running time. Drained the diff...

Need some help with jetting the stock Nikki carb on my 1985 12A IT-A Rx-7, please. And I hope this research will be helpful to others. Please note - I run in Colorado at about 5,000 feet above sea level. About 18% less oxygen at this altitude and summer trackside temps exceed 95F (very low...

More newbie questions! IT-A 1985 Rx-7, 4.77 Kia Limited Slip. What's the recommended/preferred differential lube? For the tranny, any reason not to use Mobil1 75W-90 LS (synthetic GL-5)? And, my rear rotors are warped - the pad oscillates 1/8" idling in fifth gear (wheels off, car safely on...

I'm looking for some wise and experienced help with my IT-A 1985 Rx-7, please. No need to get dirty or take late-night calls! Perhaps someone has built/campaigned one and wants tp help a novice create a stable, reliable car? Building a learning platform, not the fastest car. Want to learn to be...

It sounds like something out of "Mythbusters," but I heard you can do your own brake rotor cryogenics at home with "fairly good" results. I'm thinking - rotors on the outdoor gas grill (400-500F) for a while, cool them, then into a cooler with dry ice (-110F). Maybe two-three cycles? This...

Newbie needs some help, please. I've got a 1985 12A RX-7 running SCCA ITA. I believe it was originally a Pro7 car out of California (tokico illuminas, front coilovers, six-point welded cage, stock motor and carb, 4.77 LSD) I've got the chance to strip a 1985 GSL-SE street car, roller (no engine...