for a 93-94 rx7, whats the best fuel upgrades? i kno for a civic u get bigger injectors and a fuel pump and a fpr to run it more rich for turning up the boost, but im not sure about rotarys. i plan on gettin the power fc to tune my ecu with but i need help on the best pumps and injectors plus w/e else i need to upgrade.

 

upgrade your secondary injectors to either 1300cc or 1600cc injectors. With the 1600cc (required for high horsepower) you will need a new fuel rail and fuel pressure regulator. You also need to upgrade your fuel pump. Just go to one of the rx7 stores and take your pic depending on how much power you want.

 

Depends on what you want to do. Replacing the primaires with 850s and replacing the fuel pump with the supra pump or the walbro have been pretty popular lately.

 

how much hp is capable on the 850's and a walboro pump?

 

Here's a page I wrote that allows you to play with the numbers. It also has some (hopefully) helpful hints about how to choose numbers for each input:
http://maxcooper.com/rx7/how-to/fuel_system/calcs.html

-Max

 

Damn, I haven't seen that before. Nice. That's a keeper.

I would have to say any fuel system that's to be upgraded would include everything. If you're getting serious enough to really want a solid system then the pump, injectors and every last component in between should be looked at and planned out. What's the point of tearing into your system only to find out that you should have done everything the first time around? (Like me)

 

I agree with this to a point. I am running stock new 850s in a modded primary rail, RC bored out 1300cc injectors, and a Nippondenso fuel pump. Factory rails, factory regulator. I like my fuel system as simple as possible.......seen too many fires from wonderful DIY "custom" installs. Not knocking the aftermarket parts at all, when installed correctly they are fine.

I have made good power with my setup, at one point I was trapping ~124 mph on the street on pump gas, and have never had any problems at all with my fuel system.