every manifold i find is a t4 flange is it just easier to make those and have the person buy the t4-t3 adapter plate or do we really need to run that big of a turbo im only wanting to get about ~450 HP out of 15 PSI but the billet ball bearing turbos ive been looking at are all t3 flanged rated up to 600 HP

 

Rotaries are not as "efficient" and require more fuel and air. From what I have read, for every 10 hp you make on a piston car, you make about 7.5 hp in a rotary, so we tend to upsize the turbos. Rotaries also flow alot of exhaust gasses. A T3 may work at smaller hp levels, but will tend to be a choke point in the higher RPM / hp levels.

Howard coleman has a lot of good info in the single turbo and auxiliary injection section of the forum.

https://www.rx7club.com/auxiliary-in...turbos-888852/

 

yes, the rotary engine does need a larger turbine snail to do it's job. T3 flanges are too restrictive and hurt most turbo's efficiency numbers(especially with your target goal).

and take howard's threads with a grain of salt, some of the information is inaccurate or misleading. there are no rules to building a car and everyone's results will vary, i've broken higher than his 1.3VE division theory which means his fuel calculations are in fact lower than they should be. then with race fuels the numbers become even more skewed when you push the limits. consider it a "ballpark" lesson.