Rtek 1.8 and bnr stage 1
 

Is Rtek 1.8 good enough for bnr stage 1 turbo.? would I run into any problems

No it will not. The four 720cc injectors with the 1.8 will still inject the same amount of fuel as the stock 550's.

wow didn't know that thanks. 2.1 here I come.:)

Dont think this is true. Why would you even want a rtek chip then?

This guy is doing it...
https://www.rx7club.com/members/yellowspeed17-44169/

Maybe look at this thread.

https://www.rx7club.com/rtek-forum-168/rtek-1-8-setup-723382/

I'd think you'd be okay, but to extract more power you'll want something you can tune, you can use a safc along w/ 1.8, but for that price you could get 2.1.

Good luck!

It's not worth it, you COULD run it but at a lower boost level. Do it right and get the 2.1, you won't regret it.