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Old 07-21-2014, 01:49 PM
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Default Thunderbolt IV ignition module

My module stated it's a V8-22 module. I was offered a V8-20R module.....will this one work for my 260hp 350?

Thanks
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Old 07-21-2014, 03:48 PM
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somebody?
anybody?
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Old 07-21-2014, 04:14 PM
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should work fine just have to retime your motor V8-22 has 22 degrees of advance and the V8-20 has only 20 degrees of advance so your base timing is different.
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Old 07-21-2014, 05:26 PM
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I was thinking exactly the same way. Thanks for the response!!!
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Old 07-21-2014, 05:26 PM
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V8-22 Module has 22 Total Advance all in by 4500rpm.

V8-20R Module has 20 Total Advance all in by 5250 RPM.

Therefore, I would not recommend the V8-20R module. It's got a super slow azz curve.

This is according to my notes. Which I'm sharing to you for free. Thus, if I'm wrong, I owe you nothing. LOL.
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Old 07-21-2014, 05:31 PM
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Ok, thanks.

Looks like I need a V8-22module then!!
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Old 07-21-2014, 05:41 PM
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I might just have a pair......

Meeting a guy at the shop in a few minutes.....will let you know....
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Old 07-21-2014, 06:00 PM
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Last handful of pages on this Merc bulletin shows a lot of Merc's most used modules' curves/specs:

http://www.boatfix.com/merc/Techbk/95/95HGB4.PDF
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Old 07-21-2014, 06:02 PM
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Originally Posted by commandersander
I might just have a pair......
How would your wife / girlfriend respond to that ?
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Old 07-21-2014, 06:51 PM
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Thanks commandersander!!
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