$.29 mod ? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-03-2007, 11:43 AM   #1
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Default $.29 mod ?

after looking at this topic, http://www.bonnevilleclub.com/forum/...ic.php?t=79116

i was thinking . is there any way to put one in before the icm to make the spark hotter? just wondering if it would work and if longivity would become an issue.
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Old 06-03-2007, 11:52 AM   #2
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No, but you can ditch the Magnavox single-coil setup and switch to the AC Delco Type II system, then put on S2 (97 and newer) ignition coils. That should give you a noticable improvement.

The only way to increase spark voltage is to either boost your alternator output (slight gain), go to hotter coils (better gain depending on year), or switch to a standalone MSD ignition system.

There is no power to be gained unless you have a weak spark. Hotter spark doesn't generally mean more power unless you need a hotter spark due to other mods.
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Old 06-03-2007, 11:58 AM   #3
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thats what i was thinking just was wondering. thanks. i know i dont needed it just day dreaming. been working 50 miles from anyone with people that only speak spanish. had a long time to think about this. i think it might work if i made a plate and put the diodes in to it. taking the output from the icm into the diode then into the coil.
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Old 06-03-2007, 12:06 PM   #4
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And what'* the diode in that location going to do for you?
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Old 06-03-2007, 01:37 PM   #5
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slightly increase the voltage to the coils. my car came with type 2.
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Old 06-03-2007, 03:04 PM   #6
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Doesn't work the same as with the alternator field control signal from the PCM.

Diodes don't increase voltage. They decrease it by .3 or .7 volts depending on whether they're germanium-doped or silicon.

A diode simply blocks current flow in one direction, based on doping, or 'polarity' in your circuit (reverse or forward bias). As a function of HOW it works, it 'drops' a small amount of voltage in the forward direction.
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Old 06-04-2007, 02:08 AM   #7
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Quote:
Originally Posted by willwren
Doesn't work the same as with the alternator field control signal from the PCM.

Diodes don't increase voltage. They decrease it by .3 or .7 volts depending on whether they're germanium-doped or silicon.

A diode simply blocks current flow in one direction, based on doping, or 'polarity' in your circuit (reverse or forward bias). As a function of HOW it works, it 'drops' a small amount of voltage in the forward direction.
The alternator/pcm sense the output voltage to make sure its putting out the right voltage, so by dropping the voltage that the alternator/pcm SEES by .3-.7 volts, it will increase the output proportionally... thus the $.29 mod works..
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Old 06-04-2007, 08:07 AM   #8
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ok that makes since more then thanks
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Old 06-04-2007, 08:25 AM   #9
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It makes sense for the alternator in a GP the way the original article is written..and knowing the alts are different for GP vs Bonne factors.

However this is not the question

The question is.. Can a diode make the coils/ICM put out a hotter spark. Answer is still no.
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