To do this conversion aprox. how much would it cost ? and would i need to change subframes like on a FD or is it just a matter of motor mounts and other stuff like that I searched but didnt get any answers to my questions really

 

first to tell to use the search button, there have been millions of posts on this subject

 

There is a post called "My 3 Rotor FC Build" not 1/2 an inch away!!

 

I was mainly asking about the subframe and i did search and found nothing about the subframe

 

and as for the other thread it gives a cost but he did say he wasnt finished did he not? hmm im gonna go over to DSM talk and tell someone to do search maybe ill feel "big" after im done

 

okay well the FC is a good plateform for a 20B, other than getting new motor mounts and a standalone ECU, you don't need to modify the car.

 

Didn't mean to flame you hard for not searching, it's just a fairly good thing to do when you want to know something first, plus it's a question asked almost every day on here.

As BlackFC said, to get a 20B FC running you need motor mounts and an ecu. Other compoenents of course have to be upgraded (fuel system, intercooler, etc)
If you want to use the stock mounts you will have to remove the swaybar (not the better choice).

 

A 20B conversion is about $35,000 from a professional shop, depending on their respective package deals and options.

Note that the 20B conversion is a custom process, not a bolt-on kit, so it depends on how you build it. Therefore, questions like "how much horsepower", "how will it handle", "how much will it cost if I do it myself", etc., cannot be answered on an individual basis. On that note, the FC doesn't necessarily require a subframe, but you could have one installed if you like. Also to correct previous posts, you do not need a standalone EMS, upgraded fuel system, intercooler, sway bar, etc., depending on how much of the original 20B you have, how you build the car, etc. However, the 20B will absolutey not fit the stock mounts of any RX-7 made to date, so some type of fix is required for that issue. Oh, and yes, you may need to modify the car, once again depending on how you build it. Is that vague enough?

Searching this 2Gen subforum isn't going to help much. I recommend just going to our well-hidden 20B subforum and reading every thread.
https://www.rx7club.com/forum/forumd...365&forumid=95

Also, these two external links cover the basics:
http://www.se-rx7.com/20b/
http://fc3s-pro.com/TECH/20B/20b.html