How Much To Lower Timing With 75 Shot

Discussion in 'Fox 5.0 Mustang Tech' started by Silver5.0Stang1990, Jul 24, 2013.


  1. Silver5.0Stang1990

    Silver5.0Stang1990 New Member

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    How much do I need to lower my timing when I use a 75 shot.. Right now it's set to 14 degrees but I'm going to change my plugs from 25s to 24s and I'll gap them around 38.
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  2. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    I would set your base timing around 8 for that. The colder plugs will help too!
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  3. Silver5.0Stang1990

    Silver5.0Stang1990 New Member

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    Thanks I actually set it around 9 at first then moved it up to around 11.. I also raised my fuel pressure from 40 to 50 just to make sure it doesn't lean out.. It ran really good dropped my ETs from 13.80s to 13.20s.
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  4. Silver5.0Stang1990

    Silver5.0Stang1990 New Member

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    Next week I'm putting in the 125 jets and hoping everything holds!
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  5. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    What nitrous kit are you using? If you're using the NOS kit or something that operate similarly, then you don't need to mess with fuel pressure at all.
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  6. Silver5.0Stang1990

    Silver5.0Stang1990 New Member

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    I'm using a slightly older compucar nitrous kit.. It wasn't running real rich even after raising the fuel pressure so I don't know.
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  7. A5literMan

    A5literMan Mustang Master

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    I run my timing @10 deg with a 125 shot and 93 oct fuel
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  8. Gearbanger 101

    Gearbanger 101 we love us some gays up here Super Mod

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    Instructions for my ZEX kit states that with a 75-shot, the stock timing is sufficient. It drops 2-degree's at 100hp. The instructions are generally a little on the conservative side for wide safety margin, so if you're running 8-degree's now, you should be more than fine. As always though, make sure you're also running good fuel.
    #8

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