Yeah I would sat that Dragons reccomendation is a little overkill in order to reach your stated HP goal. A good sideport will give you all that you need. I am not sold on bridgeports for turbo cars yet anyway.



Rotaries use larger A/R's because of the Exhaust pressure. The volume of air is not much different than that of a 2.5 litre engine. cuz thats what the displacement of a two rotor enigne is. However the perephrial port exhaust design gives lots of pressure on the exhaust and this causes a need for a larger A/R.



The main reason a piston engine could make more power on the same turbine is boost. Most Rotaries like the ones we build cant take the high boost as say the 2JZ engine can. Most GT-Rs and supras boost close to 2 kilos and the most I have seen on a rotary is 1.7. I would say that is the reason you see differences.



As far as fuel requirements for 550 HP you can probably slide in there but your inj% will be greater that 80% I dont really worry about that a whole lot when it gets over 90 then I would say time to change.

If you really want to make 600RWHP then a slightly better turbine is in order and then you will need to run larger injectors and a pump that can keep em filled.

 

I wonder if the PFC and the Haltech have different methods of measuring injector duty. Both Igy and Dragon have hit the 80% injector duty mark(me as well) with 850cc primary and 1680cc secondaries. I have "tried" to get them lower, but I start pinging even with Japanese High-Octane(102+octane). When I had the non-sequential setup, I was hitting 60%-65% injector duty boosting .85 kilos.



My motor is stock and I am running a ND fuel pump with aeromotive FPR set at 3 kilos(~45psi) without vacuum.

 

Rob, two bolts PLUS hood pins. Ranzo, I'm with you. As it sits I'm going to go with the smallest of my previuosly mentioned options, the GT35/40 Ball bearing, 1.06ar. It seem that this turbo should be good for low 500s@ 20-22 psi. I will be adding a surge tank, a second fuel pump, and some larger primaries. like 850s, or 920s. Careful tuninig of the Haltech, and some crossed fingers. We shall see... Carl

 

The backwards hood on a first gen has its advantages!



Though I do have to explain nearly every day why the back of my hood is up so high.

 

Im pretty sure the PFC calculates it using injector size and the map setting for the cells that you are in. Halteck may actually be looking at how many times the injector is firing.

 

Randy,



What size injectors and what injector duty are you seeing on your PFC?

 

I see between 84-90% depending on the day. I use 550 prim. and 720 sec. boosting 1K. Stock engine 362 HP.

 

Has anyone run 20-24psi on a GT35/40? Nocab says 430@15.5psi, RPM Performance says 430@10psi(dyno) all these guys with 35/40, and no one has the *****/setup to turn it up to a modest 22psi, what gives????

 

Never get that w/ a gt35, a bigger garret turbo would tho, like you listed