Hi, just got my series 5 bnr stage 2 turbo back (Looks Awesome!). Just wondering what size injectors to use when I install this turbo? Will 4 720's suffice? Or should I keep 550 primaries and go with a bigger secondary? I currently have 2 550's and 2 720's but just wondering what to do. Here's the rx7store add for the upgrade:

Stage 2: The stage 2 turbocharger upgrade for the S5 RX7 consists of a T04B compressor wheel, T04B compressor cover package with dynamic seal backing plate and dynamic sealed thrust collar. Turbine wheel is clipped to spec to decrease back pressure and help stabilize rotating assembly RPM. The Rotating assemblies are balanced and blue printed to minimize vibrations and to give you a more reliable turbocharger upgrade. The stage 2 turbocharger has a 360 thrust bearing option for the people running 15 psi or more. The wastegate is ported, and also the turbine housing inlet is portmatched to the gasket. This set up has dynoed 332 RWHP at 14 psi of boost, also has ran an ET and MPH of 12.3 at 114. The car will reach peak boost around an estimated 3800 RPM.

 

what does your fuel control consist of?

 

I tried using 720 primaries in mine however this made me have bad hotstart issues etc... so I'm going with a 550/890 combo with my stage III

 

I knew I left out some info. I'm gonna be running a Microtech ltx-8. This will be on a series 4 motor (stock internally) with that series 5 stage 2 turbo. This motor will be put into my first gen!!!


and that set up is sufficient for the stage 3 huh? You think I would be good with the stock 550 primaries and 720 secondaries? (my 720's will be gslse injectors, I had them cleaned at RC Engineering and they both flowed 720).