1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

2nd gen coil pack for direct fire

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Old Sep 23, 2001 | 04:34 PM
  #26  
REVHED's Avatar
Hunting Skylines
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From: Brisbane, Queensland, Australia.
Madaz, on this particular dyno I made around 130hp at the wheels but I'm probably getting an IDA Weber soon so that should add another 10-15hp. I wouldn't say the direct fire made a BIG difference but it definately seems to run a bit smoother especially at high rpm. You should try it. As for the radiator it's a 3 core item and the temp gauge never goes above 1/3rd of the way up. Just take your radiator to the local shop and they'll re-core it for ya.
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Old Oct 23, 2001 | 08:50 AM
  #27  
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EliteHardcoreCanuckSquad
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From: Toronto
This may be a dumb question after all the Direct Fire setup talk.
But I want to know if it's possible to use a 2nd gen leading coil to direct fire my leading plugs by just replacing the leading coil with the 2nd gen leading one (making the 2nd gen coil fire both @ the same time).

Are there any resistance or timing issue I should be worried about?
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Old Oct 23, 2001 | 12:17 PM
  #28  
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From: Santurce
Originally posted by Jeff20B
To keep it on topic, the resistance of a 2nd gen Leading coil is too low for a 1st gen ignitor. But I would recomend installing a 3rd ignitor and using two stock style coils on Leading. Care for more info?
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Old Oct 23, 2001 | 01:27 PM
  #29  
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From: Westminster, MD, USA
Jeff,
Why are you trying to rev to/past 8000rpm? Power on a stock ported motor drops off after about 6500. Unless you have a ported motor designed to rev to 8-9k, you are loosing power to the wheels. I know you want to go past the peak before the shift so that the next gear falls into the peak area, but 8k is just a little too far. Shifting around 7k should yeild better acceleration IMHO, but if you just want the car to sound cool, go for 8k

my $.02 from my experience with my G-tech and dyno graphs
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Old Oct 24, 2001 | 04:57 AM
  #30  
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Yeah it does sound cool, but I wouldn't call shifting at high (8K) RPM "loosing power at my wheels" per se. You have a good point, but it's a little fuzzy. To me, it looks like you're going on what you've just learned about your car on a dyno with the DIS coil and MSD that we've been told has a tendency to loose power past 8k RPM. Now I'm a little fuzzy. Sorry, could you repeat that?(I'm a little tired and I wish I'd seen this sooner)


> Are there any resistance or timing issue I should be worried about? <
MyRxBad, the 2nd gen coil's resistance is too low and will kill a 1st gen ignitor.
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Old Oct 24, 2001 | 06:32 AM
  #31  
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From: Westminster, MD, USA
It is not based on my dyno runs alone. Look at dyno runs on a stock ported motor and see where the peak Hp is located. It will be between 6-7kRPM. Also your peak torque will be around 3-4K. Oh, and if you have a wideband O2 sensor hooked up during the pull, you will see that it is burning all the fuel, so any more spark does not gain you much - It just helps to smooth out the power. Again this is with a stock ported motor and a correctly adjusted carb/injection system.

Since I've gone to a ported motor, I can't do any stock-port evaluations on the dyno for you.
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