zizrac

Ok rotary techs, a little advice please.

I have a Racelogic TCS and a custom fuel setup that makes the project all the more interesting.

My motor was built by Pineapple and uses the MSD 6-Plus and DIS ignition. The lower intake manifold has two custom fuel injectors installed a couple inches above the original secondary injectors. The system is cross-wired with the primaries so when the front primary fires the rear secondary fires and when the rear primary fires the front custom injector fires with it.

Given this complex injector setup and the quirky nature of rotaries when it comes to fuel I have concluded it is safer to purchase the optional spark cut from Racelogic rather than risk a lean condition. For it to work it must meet the criteria from this excerpt of an email from them....
Our MSD interface is designed to interface with the crank pulses from an
MSD system, it also relies on the crank pulses being directly linked to
the spark occurrence. I.E. if there are 4 sparks per revolution then it
would be reliant on 4 pulses on the crank feed to the spark unit.
If your MSD system has this arrangement then it could be suitable.

When using spark cut, they also warned of combustion in the exhaust which I don't mind since I don't have a CAT and that the unburnt fuel may wash oil off the apex seals.

So what do you think, is it safer to go with a fuel or spark cut?
Does the spark system for the 13B meet the requirements Racelogic wrote of?
I pre-mix 2-cycle oil so is oil washing away from the apex seal a major concern?

Your comments are much appreciated.

Also, thanks to both Racelogic and Rob at Pineapple Racing for their advice.

RICE RACING

Fuel cut wont work on this engine/injector set up.

The software is written so it will cut injectors in batches (front rotor rear rotor) This means when front rotor fuel fires the software will cut both primary and secondary injector for that rotor.

In your case you have a signal for the front rotor triggering an injector for the rear rotor This is bad, for the way the racelogic works You will need to revert the injection pattern back so the extra injectors fire int he same rotor sequence as stock.

Ign cut is a bad idea on ANY engine, it results in massive wear and in some cases ignition problems under heavy traction control conditions (fouling plugs).

Fire injectors either (primary,secondary,tertiary) obviously ECU capable and within tuning window
PF
PF,SF (batch)
PF,SF,TF (batch)

& same for rear rotor, oh and finaly make sure the tertiary injecotr location is still in individual runners, not a common charge delivery pipe etc.

Good luck with it