Thunder bolt IV timing question
Anybody know what rpm the TBIV ignition reaches full advance? Also how much advance can you squeeze out of these units
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Fixx
Originally Posted by 87MagnumII
(Post 3409626)
Anybody know what rpm the TBIV ignition reaches full advance? Also how much advance can you squeeze out of these units
8*+24* = 32* total.. the number will be stamped on the side.. |
The rpm for full advance depends on which TB IV module you have. Depending on the module, it can be anywhere between 3000rpms and 5000rpms.
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Originally Posted by Griff
(Post 3409981)
The rpm for full advance depends on which TB IV module you have. Depending on the module, it can be anywhere between 3000rpms and 5000rpms.
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Does the preset # of the module ONLY matter when setting base timing? When setting total advance timing, does the -24 or -14 matter? Just bring up the RPM's til you see it stop advancing and set it at 34 degrees?? Sound right?
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Originally Posted by Thunderstruck
(Post 3410124)
Absolutely, the SC motors had different curves than the NA motors so you need to do some research on where the module came from.
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Originally Posted by kreed
(Post 3410164)
Does the preset # of the module ONLY matter when setting base timing? When setting total advance timing, does the -24 or -14 matter? Just bring up the RPM's til you see it stop advancing and set it at 34 degrees?? Sound right?
Originally Posted by 87MagnumII
(Post 3410274)
It's a v8-24 unit from a 260hp 5.7L. I upgraded to vortech iron heads, performer rpm intake, 9.8:1 compression, the lt4 hot cam with roller rockers and a 650 demon carb, I was wondering how much timing this setup will want.
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Originally Posted by 87MagnumII
(Post 3410274)
It's a v8-24 unit from a 260hp 5.7L. I upgraded to vortech iron heads, performer rpm intake, 9.8:1 compression, the lt4 hot cam with roller rockers and a 650 demon carb, I was wondering how much timing this setup will want.
Start at 32 degrees total advance and you can make small adjustments up from there. I doubt you will be able to run more than 36 degrees, and too much advance will cause detonation |
Originally Posted by rexcramer1
(Post 3410452)
With 9.8 compression you dont want too much advance. It also depends on if you want to run premium fuel all the time or not.
Start at 32 degrees total advance and you can make small adjustments up from there. I doubt you will be able to run more than 36 degrees, and too much advance will cause detonation |
Originally Posted by 87MagnumII
(Post 3410610)
Cool deal. I plan on running premium gas anyways but was told the vortecs don't like anymore than 34
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