Stupid electrical gremlins

[jjorgensen52]

Finsihed the wiring on my motor today ... or so I thought. I am using an Accel Dualsync to output cam and crank signals for my new eDist system. The problem is, the crank trigger is not inducing a signal in the ign. module. I am correct in thinking that the ign. module works by using induced current from the sprocket on the dist. shaft? (It's a hall effect sensor, if that makes any difference). This leads to the problem that the distributor signal is not functional because it is always grounded through, which doesn't make much sense to me.

 

[MikeRenz]

Re: Stupid electrical gremlins

i don't really follow what you're trying to ask. Are you using a crank trigger, or the crank signal from the dual sync.

 

[jjorgensen52]

Re: Stupid electrical gremlins

i'm using the signal from the dualsync. It should be a voltage pulse to the induction circuit for every cylinder. Except it seems to be continuously under power and thus not funtctioning properly. That is the info I was lkooking for about the ign. mod though mike

It is wired as follows:............................................________________
____....................................................................../......................................]
DIST]------Crank signal (hall effect) (+)-------=[ IGN Mod pickup (+)...]
.........]------Crank signal (hall effect) ( - )------=[ IGN Mod pickup (-) ...]
...............................................................................[

BTW, i worked on this for 11 hours today... my mind is mildly fried :roll: , so if I'm incoherent thats why

 

[jjorgensen52]

Re: Stupid electrical gremlins

New theory: after doing a bunch of research into HEI, I ran across this

"There are some differences in the signals these three types of sensors send to MegaSquirt-II. The Hall effect, optical, and points systems produces a similar signal - a square wave of constant amplitude, polarity, and duration (in engine degrees). However, the variable reluctor sensor produces a sinusoidal (alternating current) wave form (with both + and - components) whose amplitude varies with rpm. This signal can be processed by an ignition module to produce a square wave suitable for input to MegaSquirt-II."

Thus, a hall effect will not trigger the IGN module... :doh: should've known that. Which means, I believe, I can toss the IGN mod. entirely, feed the + and - hall effect to the ECM reference line, and still get an EST output. That will then trigger the dwell in my eDist to start the firing cycle. Assuming that the hall effect is working correctly in the first place.
I think I am going to go crazy before I get this to work properly :roll:

 

[ed hess]

Re: Stupid electrical gremlins

I am using the accell dual synch dist as well.

what you are trying to do is not docummented by accel as being possible with this unit as far as the directions that ship wiht the distributor.

As far as i know, and i may be wrong, this distributor will only work with the dfi gen7 and gen6.

i would suggest you call accel dfi and ask them about what you are doing.

ed

 

[jjorgensen52]

Re: Stupid electrical gremlins

I've tried calling them and I got no dice. Not even an answer. Anyway, the reason I am totally baffled is that the cam side hall effect works just fine, running through my eDist. But the crank doesn't. I have concluded that because the hall effect has a square wave output, it won't work with the IGN mod (instead, it just feeds the current from the sensor back through so it gets confused, I got it to work for a second when I was fiddling with connectors) and thus I am not getting an EST signal. Way I see it, the ign. mod outputs a square wave based on the sine wave from the inductor. So bypass that, supply the square wave and all should be go.
I did talk to a tech at a DFI 7 licensed installer, he didn't seem to think what I was doing couldn't be done, so long as I hooked it up right.

Going to go and try my new theory tomorrow afternoon, will post up results.

 

[jjorgensen52]

Re: Stupid electrical gremlins

No good... seems I'm having a disconnect between the ignition and the ECM ... cause I have no power feed at the ign module :dunno: ... going to talk to a guy who knows more about this than I tomorrow and see what his opinion is. Also going to try swapping back to a stock dist. / coil and seeing if that will allow it to fire

For those of you who know about the ECM ... what do I have to power to get the thing to be fully functional?

 

[jjorgensen52]

Re: Stupid electrical gremlins

the tech looked at it today... said he needed some other test eqiupment, is going to check it over in the morning. If it's a no show on a reason for this madness, I'm going back to regular HEI to get the motor together, running and in the truck. I might make Jimmy's running yet :tup:

In the meantime, going to keep troubleshooting the other setup... can't understand it.