How Much To Lower Timing With 75 Shot

[Silver5.0Stang1990]

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.

 

[84Ttop]

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

 

[Silver5.0Stang1990]

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.

 

[Silver5.0Stang1990]

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

 

[Noobz347]

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.

 

[Silver5.0Stang1990]

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.

 

[A5literMan]

I run my timing @10 deg with a 125 shot and 93 oct fuel

 

[Gearbanger 101]

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.