CoilX

[Hutchie]

Hi,
My RPM signal on my MR2 is not clean enough even though it is circa 5v taken from the ECU.
Will the coilX work even though is quite a low voltage "unclean" signal? -no where near 400v!

Many thanks.

Phil.

[brentp]

Hi Hutchie, apologies for the late reply.

The CoilX module is designed to tap right into the coil pack primary (the (-) connection on the coil). It won't work with a 5v signal, by design.

[ohiokm11]

Brent,

I ordered CoilX and installed it Saturday prior to a race on Sunday. The application is a 2 stroke Honda 125cc engine on a shifter kart. The CoilX instructions detail connecting to the negative side of the coil and and the other to ground. There is no 12v source feeding the coil, only a ground and +, (coil is like this)


I connected the ground of coilx to the ground on the coil, and the Coilx "Coil" wire to the + wire going into the coil from the ignition. I don't have access to an ocilloscope to check whats coming out of these. RCP is run off a 12V battery pack that is only connected to RCP.

In the software I enabled the RPM and tried the clock divider of CLOCK/128 and CLOCK/32 and got no data either time, just zeros.

Any ideas on how I can get this to work properly?

-Ray

[gizmodo]

For the my CoilX install on my car I tapped into the trigger signal (ground) going to the coil. That goes to the coil side of the CoilX. You don't cut the trigger wire, you just tap into it.

The ground from the CoilX goes to a ground on the bike. I went directly to the battery.

[brentp]

The CoilX module is designed to work with a conventional coil as gizmodo described, where the spark is triggered by the negative going pulse on on input to the coil pack, with the other coil pack connection tied to +12v.

ohiokm11, so your coil pack is essentially opposite of that, with ground fixed, and the 12v pulse providing the trigger?

[ohiokm11]

The CoilX module is designed to work with a conventional coil as gizmodo described, where the spark is triggered by the negative going pulse on on input to the coil pack, with the other coil pack connection tied to +12v.

ohiokm11, so your coil pack is essentially opposite of that, with ground fixed, and the 12v pulse providing the trigger?

That's correct Brent. The ground wire is grounded to the engine and the ground from the ignition box mounts to the same location. The + wire goes into the coil. I'm not sure that it is 12V though as there is no battery in the system, there is just a stator as shown below.

[brentp]

Unfortunately, coilx is not designed to interface with those types of coils.

its is possible to interface to that trigger signal with a custom circuit, but first we would need to see what the waveform looks like.

Would you be able to look at the signal with an oscilloscope?

[ohiokm11]

Well that's disappointing. Unfortunately no I do not have access to an oscilloscope to check the signal.

[brentp]

Try the local college or hackerspace to see if they can help you with measuring the signal. If you find a specifications sheet or more information from the manufacturer, post it here so we can learn more about how the ignition system works.