start issues

[catsey]

i have on the a 5.2Griff supercharged with a piggy back OMEX200 handling the ignition. over one year i have experienced starting issues. I finally identified the root cause . Placing my digi meter on AC V i observed no triggering from the OMEX and when it did come into life and start i observed a voltage value of 5.6 approx , Note this observation is just using a tool to observe a value i am aware that i would need an Oscilliscope for a true picture but the procedure was adequate for me to check the VR effect pick up gap. this was 0.030" i reset at 0.015"( Omex tolerance 0.012 to O.020"
I then observed a voltage indication of 8 to 9 VAC. Resolved the starting issue
the voltage prior was i believe just on the threshold of the cranking voltage required for the OMEX to trigger the ignition. My question is the OMEX MAP will this be affected as resetting the Pick up gap will affect the induce voltage level observed by the OMEX Map will this affect the MAP will i require to Rolling Road.?
A hall effect pick up is not so influenced by the pick up gap having a broader tolerance based on its principle of operation.
Appreciate any help experience with this

[blitzracing]

Just strobe the timing, if the gap has an effect the timing will move. Seems unlikely however as I expect the rise time of the signal is very sharp.

[catsey]

blitzracing said:

Just strobe the timing, if the gap has an effect the timing will move. Seems unlikely however as I expect the rise time of the signal is very sharp.

. i am a novice . I would have thought that the MAP would be referenced engine speed, induced voltage level.
I need to buy a strobe what should the advance values be? my thought was the Ignition timing would have advanced.
After sorting out the start issues( i did verify pick up wiring and impedance etc) before setting the gap.Heat shield on odd bank of cylinders had vibrated loose and damaged 2 leads developed an engine misfire So i replaced leads( Racetech ) same time dizzie cap and plugs.Plugs B7ECS. car started no misfire rev freely went for a road test after doodling on light throttle through town on opening up throttle car started to misfire . Also developed shunting sure its fouling the plugs. Will have a look tomorrow. But thanks for your help and guidance

[Belle427]

I know nothing about the Omex but if it has a Map programmed into it then I can’t see it being affected.
Are you able to connect to the Omex module on a laptop to view the ignition map?

[catsey]

Belle427 said:

I know nothing about the Omex but if it has a Map programmed into it then I can’t see it being affected.
Are you able to connect to the Omex module on a laptop to view the ignition map?

thanks no ill get a strobe ill strobe at this setting 0.015 now no prob starting however when engine gets hot starts misfire then ill set at 0.022 and strobe again and profile eng advance idle to 5k cheers

[catsey]

blitzracing said:

Just strobe the timing, if the gap has an effect the timing will move. Seems unlikely however as I expect the rise time of the signal is very sharp.

,
Thanks for your info
Didnt have a strobe set the gap at 0.023 from 0.015 car runs smooth no misfire pull up at steep hill Nick of Pendle in 5th at 1000rpm and accelerates smoothly Run up to Max Temp engine is very smooth with no misfire. So yes MVR sensor the map is affected by the air gap the gap changes the induced voltage level so in my case finding the starting issues was due to excessive gap approx 0.030 then rectifying start issue by setting gap at 0.015 led to advancing the timing engine to true speed of the engine when warm developing misfires.

[catsey]

Belle427 said:

I know nothing about the Omex but if it has a Map programmed into it then I can’t see it being affected.
Are you able to connect to the Omex module on a laptop to view the ignition map?

as you can see from my experience and born out by old faraday changing an MVR type pick up will change the MAP.

[Belle427]

Every day is a school day as they say.
Glad you got it sorted.