Re: Choosing an ignition coil
[Re: rory73]
#1692457
10/30/14 09:37 PM
10/30/14 09:37 PM
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Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing
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Posts: 3,300
Northern Indiana
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When I bought one of the HiRev boxes to test it, it came with specific instructions on which coil and ballast resistor to use.
I don't recall the specifications off hand but I should still have the instructions if you don't have them.
If I remember correctly he wanted a higher resistance ballast and coil than the MSD unit to protect the ecu.
Keith
Last edited by Dunnuck Racing; 10/30/14 09:42 PM.
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Re: Choosing an ignition coil
[Re: rory73]
#1692458
10/31/14 12:05 AM
10/31/14 12:05 AM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
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So Cal
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Quote:
Hi all
I'm about to install a FireCore distributor (not the RTR version) and Rick Ehrenberg's HiRev ECU on my low comp 440. Until now I had a Blaster II coil but that doesn't seem to be recommended with this setup. My old ECU was a standard black 5 pin with 4 pin ballast resistor, by the looks of it the original unit. It worked but the distributor was on the way out and I wanted something better anyways.
Also upgraded to Holley Commander EFI without spark control though as I didn't feel like messing with GM HEI conversion stuff.
Both FireCore and Rick suggest using an OEM style oil filled coil but which one? I don't race my cars but I do want a reliable setup.
Thanks for your input!
Tim
Mopar Performance recommends a 0.25 Ohm ballast with the Blaster II and Chrome box. Keep in mind its resistance increases as the resistor heats up as it primary purpose is to limit the current to the coil.. U can use almost any value around 1.0 ohm..
I have been running the 0.25 Ohm resistor on my warmed over 383 for over 10 years without any issues..
Just my $0.02... 
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Re: Choosing an ignition coil
[Re: Sinitro]
#1692459
10/31/14 06:44 AM
10/31/14 06:44 AM
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Joined: Oct 2014
Posts: 79
Europe
rory73
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Thanks for the warm welcome and suggestions everyone! The ECU hasn't arrived yet, didn't know it comes with more detailed instructions. I'll wait and report back! Ordered the FireCore via Jegs, here's what they have to say: Quote:
Typical Wiring for Muscle Car or Street Rod Installation:
- Mopar Style ECU: 555-40800, 555-40805, 312-P4120505, 312-P412035
- 1 Ohm Ballast Resistor: 555-40103, 312-P5206436
-Mopar OEM or OEM Style (oil filled Coil) or HP Coil 555-40105
Trouble Shooting:
- Use the appropriate BR, 1 Ohm is recommended (minimum of 0.5 Ohm)
- Operation without BR will damage the ECU and Coil
- Do not use a CD (i.e. MSD) coil since this will damage the ECU
- Check voltage between Coil (+) and good ground ... should read between 7.0 and 9,0 Volts
Of course I'd be happy keeping the Blaster II coil, maybe putting a spare in the glove box ;-)
Nothing beats a well matched setup though, even on a street car!
Tim
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Re: Choosing an ignition coil
[Re: rory73]
#1692460
10/31/14 08:51 PM
10/31/14 08:51 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
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bethlehem pa
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Quote:
HP Coil 555-40105
that's Jegs high performance coil. same as the Blaster 2 (45,000v). use what ya got....
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Re: Choosing an ignition coil
[Re: Dunnuck Racing]
#1692464
11/01/14 06:29 AM
11/01/14 06:29 AM
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Joined: Oct 2014
Posts: 79
Europe
rory73
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Thanks Keith! Interesting, some of it's verbatim from the instructions that came with the FireCore distributor. The important bit however would be this line: "Coil primary resistance should be no lower than 1.4 Ohm"That's the spec for an old points distributor, which also suggests the 0.7 Ohm Blaster 2 isn't that well suited. Alot of coil manufacturers don't publish a data sheet, at least not online but what about the Pertronix FlameThrower? http://www.summitracing.com/parts/pnx-40011/overview/I've used Pertronix in the past and they're certainly a reputable enough company to buy from. How do I calculate the correct Ballast Resistor though? Tim
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Re: Choosing an ignition coil
[Re: BigBlockMopar]
#1692467
11/01/14 01:57 PM
11/01/14 01:57 PM
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Joined: Oct 2014
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Europe
rory73
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Sort of made up my mind now. If there are no objections I'll go for the MP 4529795 Ballast Resistor: http://www.summitracing.com/parts/dcc-4529795/overview/Strictly speaking a four prong isn't needed and certainly not used by the ECU but it'll snap right in and look correct. Matter of fact I still have a spare Standard Motor Products RU12 lying around but no idea what resistance that has. I *think* it's 1.5 ohm, which would be close to the MP one. For a coil the Pertronix FlameThrower sounds right, I'll keep the Blaster 2 as spare though. Maybe I'll change everything for a computer controlled ignition in the future. No doubt light years ahead of the Mopar stuff but for the time being I'll just tweak the existing setup. Thanks everyone! Tim
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Re: Choosing an ignition coil
[Re: Dunnuck Racing]
#1692468
11/02/14 11:04 AM
11/02/14 11:04 AM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
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Quote:
Here ya go,.......
Keith
Yikes!! that ECU seems way too touchy for any type of street use but that's just me 
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