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Thunderbolt IV ignition module

Old 07-21-2014, 07:18 PM
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I thought my cruiser had a bad thunderbolt yesterday. I swapped the ignition from the good engine and she fired right up. Well before ordering one today I told the story to some good friends and they said it could have been a bad connection. They were all tight and looked fine but I crimped on 5 new ring terminals and re installed and she runs like a dream. Went out yesterday and today zero issues.

Try new connections before wasting money.
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Old 07-21-2014, 07:24 PM
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I appreciate the information. I did find loose connections in the main engine harness. I opened up the pins and checked voltage at various points. That's when I noticed the module had it's locking tab broken off. I have some lines on a module or two, but I feel without a locking tab it'll loosen up.
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Old 07-21-2014, 08:01 PM
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the 20 will work just fine just set your timing at total advance. You will need and advancing timing light so you can set at full advance.
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Old 07-21-2014, 09:30 PM
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I have a digital Bluepoint timing light, thanks.
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Old 07-21-2014, 09:38 PM
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the v6 modual is the cats ass you can run more inital timing
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Old 07-21-2014, 09:53 PM
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^^^Even for a stock 260hp 5.7?^^^

I plan on installing an Eddy intake and possibly a 350 Mag cam in the off season.

Last edited by Jonesyfxr; 07-21-2014 at 09:56 PM.
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Old 07-22-2014, 01:40 AM
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Here are the advance curves for all the modules. You don't want a V8-20R unless you plan on running the engine over 5300rpms.
Will it work...Yes. Should you use it...No. It will never fully advance.
You want to use a module that has full advance in by 4000rpms.
Attached Thumbnails Thunderbolt IV ignition module-ign-curves-large-medium-.jpg  
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Old 07-22-2014, 06:27 AM
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we use the delco est system to replace merc thunderbolt more reliable and hotter the secret for fishermen is it idles at 18-20 degrees so its very quiet and very smooth for hours of trolling the v6 box gives more inital if you set the top end timing to 30 at 3500
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