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Im still trying to get a slight miss out of the 138 and have decided to replace toe coil, just cause I can
Not sure if i need the GT40 or GT40R. Stock grey motor in her.
I get confused with the whole resistor thing

Well, looks like the GT40 up until EH then GT40r
Thats according to the Bosch Coil catalogue I just downloaded.

I even answer my own questions, and I do talk to myself. The wife is right. I AM a nutter

John wrote:The wife is right. I AM a nutter

You're on this forum, so of course you're a nutter. It's a prerequisite

John wrote:Im still trying to get a slight miss out of the 138 and have decided to replace toe coil, just cause I can
Not sure if i need the GT40 or GT40R. Stock grey motor in her.
I get confused with the whole resistor thing

Hi John,

GT40 coil is the go for the standard grey i.e. 12 volts fed to the coil during cranking and when the engine is running.

GT40R is for an ignition system fitted with a ballast resistor i.e. 12volts fed to resistor which is reduced to about 9volts (9V coil) when running. The ballast resistor is bypassed during cranking which then allows 12volts to be fed to the 9volt coil which produces a fatter spark. If you run a GT40R with the standard system you will eventially cook the coil.

Cheers.

Thanks Craig.
You've just explained it to me perfectly. Makes sense now