Patrick Patterson

this motor is in a jetboat, have had it running. Have tuned it to a degree. but having a massive problem with detonation. max timing is at 23btdc. really just wondering how the triggers should be set up. crank trig is 18x multi tooth, and cam is cam pulse 1x. both have pullup resistor on and both set to rising. wondering if one should be set to falling? seems like it gets out of sync by about 20btdc. cheers patrick.

yeah i am, do you have one?

That's really the only thing I could put it down too. This is a trigger scope with engine off filter level 1 and the fuel pump still running. Also been advised to put a suppressor on the IGN feed to DFI module if that would be any help? and shorten the earth wire that feeds it also. I've got the loom out so I will run shielded cable from the triggers to the DFI and back to the ecu. And I will pull some timing out of the tune, but it really should handle 28* all day long. Trigger Scope Log 2022-04-16 12;00;25 pm.llg

Timing light works with wasted spark. from the ecu we can lock it at 0 and read 0 and lock it at 28 and read 28 no worrys. Like I said earlier, applying level 4 filter on trig 1 fixed the fuel pump issue and steadied the spark issue. So just wondering if its more likely a trigger issue ie: getting noise at higher rpms

I don't know if it does or not. I will have to ask the old man. I think you might know him Tim Patterson from Engine Rebuilders in Wanganui.

When I built the loom for this boat, it was running the standard ECU (which had lots of problems inside the memcal chip). So we simply got the link and wired it into the box I had the standard one in. So there is no shielded cable for the triggers. The HT leads that go over the engine for cylinders 2,4,6 lay over top of the trigger wiring to the DFI unit and close to the loom that goes to the link. Could this play a part in the advancing? getting to much noise at higher rpms thinking the engine is in a different position? The way the timing light showed it, is that we were 56* BTDC not 28*?

I have a G4+ xtreame, has 2 knock inputs

Ok will do. Any recommendations only setting up knock sensors on this? Or would it be better to have knock audio to listen too?

Not that I saw or remember sorry.

Testing it with a static test light. Happened most the weekend. I changed the filter on trig 1 and it seemed to stay stable.

Ok I can change that, but would that cause the issue of it advancing past 28BTDC?

Also, when the Trigger Ref was set, should that have been done with the DFI in bypass mode or not? So with engine idling remove the 8v or est it should in theory show 10BTDC. Cant really think of anything else that cause it to advance, at a guess some points would have been in the 50'sBTDC. if you look at the map file I sent, trig 1 has level 4 filtering, that stopped the fuel pump continuously priming. No idea what to check over next, any thoughts?

Ok I will load that on. Just can’t work out why it’s over advancing from the maximum of 28

Hi Adam. what would you set the dwell time too? I have it all working, but the the ignition will come over the maximum advance. Reading on motecs site they say that if the dwell time is too short the dfi ignores the est signal. Any help would be great. blown 2 sets of head gaskets from detonation. cheers patrick. Boat.pclr

Hi Adam. will do again once I get the heads back on the motor during the week.