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Dwell Control on XR6T 

 

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 Post subject: Dwell Control on XR6T
Posted: Wed Mar 21, 2007 1:23 pm 
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Hey

Just wondering if the ECU controls the dwell or the coils/built in ignitors control it on the xr6t.

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Posted: Wed Mar 21, 2007 6:22 pm 
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my thoughts are that the ECU will do the dwell control... most COP type coils need external dwell control. id say around 2.5ms

 

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Posted: Fri Mar 23, 2007 1:07 pm 
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i had a look at ba coils today, they have only two wires, which leads me to beleive the ecu has built in ignitor and does dwell control

 

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Posted: Fri Mar 23, 2007 9:28 pm 
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Forgive my stupidity, but what's dwell control and what does it do?

 

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Posted: Fri Mar 23, 2007 10:15 pm 
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dwell is the time that the primary coil windings are earthed to charge the coil, when the primary coil earth is disconnected the magnetic field collapses and forms a high voltage buildup in the secondary windings...

 

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Posted: Mon Mar 26, 2007 10:49 am 
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thanks ebs_4l, simon from nizpro replied on the nizpro forums and confirmed it aswell :)

now i dont need to buy the autronic CDI and can just run the sm4 :)
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Posted: Mon Mar 26, 2007 11:03 am 
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So does that mean the coils have built in ignitors?
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Posted: Mon Mar 26, 2007 1:41 pm 
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i dont beleive they do, i tink the ford ecu has the ignitors... otherwise they would be 3 wire coils. I could be wrong though

 

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Posted: Mon Mar 26, 2007 1:57 pm 
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Do you know if there is any truth to this:

wolfV500 manual wrote:
How to determine if you have Coil On Plug or Coil On Plug with Internal Coil Igniter
Coil On Plug without an Internal Coil Igniter will have a resistance across two of the pins on the connector of between approximately 0.5 Ohms and 1.0 Ohm. Whereas Coil On Plug with Internal Coil Igniter will not have such a low resistance between any two pins on the coil connector.
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Posted: Mon Mar 26, 2007 2:14 pm 
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that sounds right.. since you will not have a direct connection to the coil primary circuit from the coil pins. you will see about 1.2k ohms and the other reading will be anything above this, i think the ones on the honda outbaord engine i was playing with the other day were 1.2k and 5k

with no ignitor you will see primary coil resistance of just a few ohms, .5-3ohms

also, most built in ignitor coils will have 3 wires, - + and trigger, whereas no ingitor will just have + and switching ground pulse

 

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Posted: Mon Mar 26, 2007 2:17 pm 
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Thanks, Ill test them tonight if I remember.
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