Hello Everyone, I'm new to cars but I have a large background in Motocross and I'm capable of engine, electrical, and fab work. I have a 1990 FC that I'm doing a complete track car build on and I have several questions. Thanks, feel free to link me links to other threads i havent found.

1, I'm running a stock 13b N/a internally, to learn track day/ drifting the fundamentals on a lower hp car, but I do want to do a few things externally. I plan on buying a header and building a pipe. I'm not sure if rotarys require a certain amount of back pressure to change the power curve similar to a 2 stroke dirt bike? or can you just run a straight pipe with a silencer?

2, Besides building a cold air intake and running a better filter, what modifications can be made to the intake to increase performance? porting? other random stuff?

3, my chassis is a 90 but my engine wiring harness cpu and all came from an 86, what vacuum/electrical systems can be deleted? I wont be running a/c, heat/radio. I only need the bare minimum.

4, I'm familiar with both four stroke and 2 stroke engines and have no problem working on them. I understand how a rotary works and all the parts, i'm not exactly sure how it lubricates itself. THE intake has 2 injectors on it, but there are also 2 in the center iron. Are these oil injectors? or fuel and air as well?

Thanks,

Patrick

 

look up videos of Aaron Cake on Youtube as he has a lot of stuff viewable on engine rebuilds and a N/A to TII engine build.

 

Earlier cars used exhaust backpressure to activate the aux intake ports but your NA uses the air pump so you're fine. HOWEVER, a header, straight pipe and single silencer is going to be loud to a ridiculous degree.

That's about it really unless you are talking full intake manifold swaps. Note the car already has a cold air intake from the factory.

Uh, find out what engine is in the car because there are some significant differences between the '86 (S4) and 89+ (S5) engines. Sounds like a bit of a bastardization as the S4 ECU uses different sensors and won't have outputs for the aux ports and a few other things.

The nice thing is that the ECU relies on no other part of the car to function. Give the ECU power and ground and it will run the engine. However some other parts of the system are on the body harnesses such as coils. Also the CAS wiring is on the engine harness.

Lubrication is like any other engine with one exception. A oil pump draws oil from a sump then pumps it around the engine to lubricate all the bearings. Oil jets spray the inside of the rotors to cool them, and there is an oil cooler to cool the whole system.

The exception is that there are 4 oil injectors, two on the LIM and on on each rotor housing near the intake ports. These dribble oil onto the apex seal directly and into the intake airstream to lubricate the apex and corner seals.

A metering oil pump controls how much oil these injectors see based on throttle position (earlier cars) or an ECU signal (later cars).