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Location:
Victoria, Melbourne
Registered:
August 2003
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Bosch Coil with ballast resistor...
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Wed, 11 February 2004 10:04
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Hi guys,
Well just got myself a Bosch GT40RT transformer ignition coil
today and i seem to have run into a bit of a problem... 
It says that the coil needs to b used in conjunction with a ballast resistor.
Did the Aus Spec ae86 come with a ballast resistor or do i need to install one?
If so what type of ballast resistor?
If i knew i was going to run into a problem like this i would have got the GT40R and just slapped it in!! 
Any info is much appreciated!
thanks
Ryan
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Location:
sydney
Registered:
March 2003
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Re: Bosch Coil with ballast resistor...
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Wed, 11 February 2004 10:13
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the r in gt40 stands for
use with a resisotr
u need a gt40 if u want to run no resistor
unless things have changed over past 5 yrs
its been awhile sine ive bought coils
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Bosch Coil with ballast resistor...
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Wed, 11 February 2004 12:32
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Depends what engine you're using - if you're using a 4AC with stocky point ignition(  ), then yup, there's a resistor there.
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Location:
1st street on the right
Registered:
November 2002
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Re: Bosch Coil with ballast resistor...
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Wed, 11 February 2004 20:45
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You can just get rid of the resistor and use a gt40. Just remove the res and wire direct to coil. I've done this in more things than I care to remember without porblems. Just sends 12 volts to coil instead of 8 (which some get fed at startup anyway).
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Bosch Coil with ballast resistor...
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Thu, 12 February 2004 06:24
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GT40 or GT40R??
do not use these GT40 coils with elec ignition. they will die.
i give them about two weeks with the jaycar HEi kit  (well didn't give but thats what they take  )
Cya, Stewart
ps, they are fine for points tho, they just can't deal with the higher dwell of elec.
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Location:
Victoria, Melbourne
Registered:
August 2003
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Re: Bosch Coil with ballast resistor...
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Thu, 12 February 2004 06:29
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oh ok, yeah coz im installing a 4age next week, so im going to install the gt40rt with a ballast resistor i picked up 2day!!
thanks for the help. 
Ryan
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Location:
1st street on the right
Registered:
November 2002
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Re: Bosch Coil with ballast resistor...
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Thu, 12 February 2004 10:33
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Stewart, Can you elaborate on how it's affected by increased dwell? No disbelieving you, just furthering my ed. As I understand, the resistor allows 8 volts to the coil (why?) but checking a 5me elec setup I have here with resistor it bypasses at startup and feeds 12v.
Best prior experience I've had is on range rovers which don't have a resistor but a resistive wire as the feed to the coil. This burns out and we just replaced the wire with std and ran a non resistive coil, elec or points.
Pls explain
thanks
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: Bosch Coil with ballast resistor...
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Thu, 12 February 2004 12:32
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Reduced dwell (longer charge time) can possibly cause a non-suitable coil to overheat and die.
Most ballast restitors drop 6-8V to the coil during running, again, to stop overheating.
It gets bypassed at startup, supplying 12V to allow for easier cold-starts (rich mixtures).
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