Hi i have recently bought a rx-7 turbo 86 with a bad engine . after reading i found out how to rebuild it. i used stock parts new on the internal(every seal or o-ring or gasket) except for "super seals" (dont know what they exactly are) for the apex seals. and i bought used, in good condition, rotors and housings. I also had the housings "street ported" and cleaned up good. After the install of the short block im putting everything back as it came. However once I get it running I want to Boost it and make as much power as i can by adding on "bolt on parts". How much power will my rebuild hold, with and upgraded turbo kit and other performance compontets that are needed added together make? and what products are available????????????? thank you -shiva r

 

Three main things are needed.

1. Larger turbo. Hybrid turbos like BNR makes are a great choice. You can choose a turbo that will get you anywhere from 300 - 400+ whp. (http://www.bnrturbos.com/2ndGen.htm)

2. Fuel. Aftermarket fuel pump (walbro 255 is common). Larger fuel injectors: 4x720cc Greddy/Densos will be good for 300+ whp, depending on fuel pressure. Beyond that 1680cc Bosch secondaries are common.

3. Fuel control. This will depend on fuel injectors and turbo size. It ranges from piggyback computers like an AFC-NEO or Rtek chipped ECUs (www.pocketlogger.com) to a stand alone EMS such as Haltech, Microtech, etc...

 

thanks man. by the way do you know on av. how much power i will get from the street porting alone. I just did it by the template. it seems as if i would get alot of power.

 

Hard to say. The size of a "street port" varies, and the turbo size will be the main restriction on the peak horsepower, not the port size. It's a little more cut and dry with a NA motor.

You can probably find some comparisons here on the forum. A search should turn some up.

 

New to these rotary engines and wondering why they need big injectors to get much horsepower.

Most of the combustion engines I had experience with, like turbo cars, for 300 horsepower, the injectors are usually between 370cc and 420cc.

 

The shape of the combustion chamber, overlap, and airflow. Keep in mind that in a piston engine, the injector only has to feed one combustion event in it's cylinder every 4 strokes. In a rotary, the rotor make three combustion events ever rotation.

Stock NA FC came with 4 x 460CC injectors. Stock TII has 4 x 550CC injectors.

I run a bit more then 400HP in mine and use 2 x 720CC and 2 x 1600CC.

 

This isn't the clean-cut answer you're looking for, but that's a really subjective question. What people will call a "street port" varies widely on how much airflow it will allow.

Someone else here said to look at going with a BNR hybrid turbo, and with the right bolt-ons, you could make 300-400hp. This is a real rough guess on my part, but look at the BNR turbos on this website:
http://www.bnrturbos.com/2ndGen.htm
I'd estimate that you'll make an extra 20-30hp over what any one of those turbos is rated for on stock ports, and you'll probably spool it a bit faster, too.

Also, I'd just like to point out that the 86 RX7 never came as a turbo in the U.S., meaning that if you're in the U.S., your car has an engine that sopmeone else put in. (I forgot to look at where you are earlier)



This guy covers the rest of what you asked VERY nicely.
Another word of advice, Aaron Cake is one of the most knowledgeable members on this forum; anything he says, you can take as the word of God.

 

Thanks for the support, but statements like that scare the hell out of me. Everyone makes mistakes.