123 Ignition: Am I buying the Bosch Blue or Red Coil?

[dj_efk]

Conflicting info from 123 Ignition themselves!

Which one and why? Who has got what (and do we have actual proof of which one is better with this setup) ??

 

[Stevehose]

Blue coil has a built-in ballast resistor which you don’t need. Red coil is higher output.

 

[autokunst]

I am currently using the red coil. Although I don't have a lot of mileage on the setup to prove success.

 

[dj_efk]

OK so sounds like it's the red coil. Thanks guys.

Do I understand I need an external resistor? If so what is the spec (or even better, is there a link)?

 

[Stevehose]

I've run the 123 with a red coil (NOS German one but haven't heard anything bad about the new ones) for over 5 years without any issues. Works great. You do not need the ballast resistor. Mine is only used as a electrical junction box.

 

[HB Chris]

Steve, Why so many wires by your coil? Looks like you still have the black/red speed relay wires?

 

[Stevehose]

Hmmm dunno, I thought I removed the speed relay wires, looks like I have a weekend project to get to the bottom of it!

I do have the 123 and my fuel pump tach sensor hooked up there, a radio interference suppressor, tach wire, starter wire. I'll check, thanks for the eagle eye.

Steve, Why so many wires by your coil? Looks like you still have the black/red speed relay wires?