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.
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.
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.
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.