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Re: good ignition modules?
[Re: pjc360]
#1162859
01/26/12 11:58 PM
01/26/12 11:58 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
So running an extra ground wire from the ignition module helps? does it have to be grounded to the engine? or can i ground it off the firewall right next to it?
It may sound strange, but the way most of our vehicles are wired, the firewall is not at the same ground potential as the engine. In electrical terms it is a ground loop. Most of our cars use a negative battery cable with two wires. A small wire going to the body and a larger wire going to the engine block. When you crank the starter to start the car, a large amount of current flows through the engine block negative wire to the battery. At high current, even small amounts of resistance in the battery ground cable will increase the ground level voltage. Because the body, and ignition box, are connected to a different ground wire the ground reference can be different than the engine block. The ignition box need the same ground reference point to detect the magnetic pulse from the distributor. Even with a wire from the block to ignition box, the ignition may not want to start (under starter load) if the engine block ground has too much resistance. Too much resistance in the battery cables will reduce the operating voltage to the ignition box and ignition coil. That covers the grounding issues that are usually harder to sort out than bad primary wiring, coil or ballast resistor problems.
Here is a link to wiki about ground loops: http://en.wikipedia.org/wiki/Ground_loop_(electricity)
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Re: good ignition modules?
[Re: pjc360]
#1162862
01/27/12 01:45 AM
01/27/12 01:45 AM
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Joined: Oct 2004
Posts: 16,482 Canada
CrAzYMoPaRGuY
I Live Here
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I Live Here
Joined: Oct 2004
Posts: 16,482
Canada
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Gold boxes aren't made for street use.
CrAzYMoPaRGuY
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Re: good ignition modules?
[Re: Robbins]
#1162865
01/27/12 10:33 AM
01/27/12 10:33 AM
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Joined: Jan 2003
Posts: 5,446 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,446
Indiana
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I agree that the original FBO A688 (ballast style) was the best ECU that I have run to date. The second generation FBO HR688 (non ballast style) only lasted 4 months on my car. I sent that box in so that FBO can perform a warranty upgrade into their new HHR688 (non ballast, rev limiter) in October, and I am being told that it will not be ready until March. If this new box performs at least as well as the original A688 box, then that box would be a good choice for the stock replacement ECU upgrade.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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