Run Pre-mix or run RA OMP?

[infernosg]

What advice would you guys give for the following application:

S5 engine (electronic OMP)
Custom intake manifold (no provision for oil injectors)
Haltech Sprint RE (can't control electronic OMP)

Changing/modifying the intake manifold and/or changing the ECU are not options at this time, unfortunately. Aside from living with pre-mixing and no decel fuel cut the only option I can think of is to switch to a S4 front cover (clearance issues with S5 rotating assembly) and use the S4 mechnical OMP, which requires rigging some kind of OMP-throttle linkage (running TWM ITB's) and utilizing only two of the stock four oil injectors.

[Pete_89T2]

Originally Posted by infernosg

What advice would you guys give for the following application:

S5 engine (electronic OMP)
Custom intake manifold (no provision for oil injectors)
Haltech Sprint RE (can't control electronic OMP)

Changing/modifying the intake manifold and/or changing the ECU are not options at this time, unfortunately. Aside from living with pre-mixing and no decel fuel cut the only option I can think of is to switch to a S4 front cover (clearance issues with S5 rotating assembly) and use the S4 mechnical OMP, which requires rigging some kind of OMP-throttle linkage (running TWM ITB's) and utilizing only two of the stock four oil injectors.

The S5 electronic OMP is basically a 4 position stepper motor, perhaps you can use a spare output from the Haltech to run it at one of those four fixed positions (suggest the one that corresponds to "pig rich" oil delivery)? Or you can electrically hardwire it to do the same whenever the engine is running. The 2 extra OMP ports going to the intake mani would be blocked off on the OMP, but you would retain the 2 injector lines you have going to the housings.

Not the greatest solution, and you'll still have to live with premixing with the fuel, but it should be good enough to allow you to enable decel fuel cut as those 2 remaining OMP injectors will be functional.