they may be a touch warm but I don't think you're in danger. rx-7's see 1700 ALL the time, and some setups (really lean cruise or some of the bigger power characters while WTFO) hit 1900.

Yeah, but that is a rotary, which is hot by or because of design. Their design is much more forgiving of the high temps (except for on the wiring harnesses and hoses).

I echo what has already been said.

Save for valves, rotaries use the same stuff/materials/etc. A turbine wheel will not melt for a miata's 1600 degree heat, and then magically survive a rotary's 1900

Nobody said he needed to worry about the turbine, the exhaust valves will melt first.

Yes, but it's still apple to oranges when comparing heat from a piston engine and heat in a rotary engine. Apex seals, which I have never seen melt personally, would be my only worry with heat (other than warping). Piston engines however have valves with relatively thin material, round, and high velocity hot gas passing around them. Rotary the gas can pass unobstructed right out the exhaust port. Hot gas wants to build a shortcut through the valves.

Did a WOT 3rd gear pull today and took a glance at the gauge. At about 4k it's 1400 degrees and by 6k it was nearly 1700F. I'm running 14psi.

I was at the track last weekend and asked a guy about his egt's with really built up Audi 5 cylinder turbo and he said he sees over 2000f on the track. this does not mean 2000f is ok, but I dont think your temps are a that high. I saw an article on autospeed.com about egts and I think they said 1800f is about as high as you want to see. the temps referenced in the article is in Celsius fyi.

check out this series of articles on egts

http://autospeed.com/cms/A_0364/article.html