ignition cutout

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rallyrs
MegaSquirt Newbie
Posts: 19
Joined: Fri Mar 27, 2009 4:24 am

ignition cutout

Post by rallyrs » Wed May 04, 2011 2:33 am

I had an oops the other day in the escort and found a deficiancy with my instal. whilst hanging from my harness with my wheels skyward, the motor was still running. I figure relying on my reaction time or the fuel lines to purge may not be good for the wet sump engine. Wondering if anyone has any thoughts on an automatic cutout for impromptu wheels up parking.
MS2 extra, gsxr600 TB, Falcon EF vr 36:1, V6 commodore coils

long283
Helpful Squirter
Posts: 89
Joined: Fri Jun 02, 2006 6:01 pm
Location: Sydney, Australia

Re: ignition cutout

Post by long283 » Thu May 05, 2011 2:40 pm

You could get a tilt switch from a motorcycle wreckers or an electronics store to cut the ignition when a rollover triggers the switch.
But I think you will need a noise filter or a short delay so that the ignition isn't cut in hi-G turns or over rough bumps.

A small PIC chip could be programmed to take the tilt switch signal and only cut the ignition if the tilt is triggered for one second or more and maybe if the throttle is less than 10%.

Ask in the MS-Extra forum, maybe there is code that will do this using one of the spare inputs?

rallyrs
MegaSquirt Newbie
Posts: 19
Joined: Fri Mar 27, 2009 4:24 am

Re: ignition cutout

Post by rallyrs » Wed May 11, 2011 3:03 pm

Thanks. Bikes are an unknown to me so sourcing a tilt switch from 1 is a great idea. Scouring th other forums, found a brief referencce to an oil pressure cut out. If i were to Connect an oil pressure sensor to an input and use an output to kill the pumps I think this would also achieve same, I still have wet sump.my concerns are how would I start, because pressure is low,and it may effect pump priming pulse. Would I need an output, or can I turn off pumps in code?
MS2 extra, gsxr600 TB, Falcon EF vr 36:1, V6 commodore coils

devojet
Helpful Squirter
Posts: 82
Joined: Tue Jun 05, 2007 7:40 pm
Location: Gold Coast

Re: ignition cutout

Post by devojet » Thu May 12, 2011 2:06 pm

With the oil presure set up you can also run a wire from the starter circuit to bypass the oil pressure switch when the engine is cranking. I think holley sell a special oil pressure switch for the job that allows you to wire in the starter circuit as well. you will probably want to connect the switch to the ignition as well as the pump. At idle it will run for a little while after the pump has stopped.

Cheers

Daniel.
26 Chev hotrod with a 1UZFE and MS3x, Flex fuel, GPIO Transmission control and LCDash.
LS3 powered Race boat with MS3pro and GPIO.
MS2 on a 22r in a Hilux (mates car).
MS2extra on a turbo EF Falcon (brothers car).
Toyota Supra 1jz MS2extra, COP.
13B Turbo MS2extra.

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