Big Blue24
Comp Diesel Sponsor
- Joined
- Jan 5, 2008
- Messages
- 6,310
I think you'd benefit from a lighter spring, I really like the 30-35psi spring with my compound turbo setup. It always has more boost available for AFC movement than needed so you can perfectly dial back the fuel curve depending on your driving conditions.
When I used to run just an AFC spring, I really liked the old super heavy governor spring from a 160hp pump, it wouldn't go full travel till 55 psi but it worked great for a hot truck that made 80 psi. But in towing situations it was horrible at times where you'd reach a wall of not enough boost to advance the AFC foot and you'd be stuck at say 30 psi overall boost and the throttle stopped up against the AFC foot so you're only option was to downshift and grab another gear or sit there wanting more fuel and not able to get it.
When I used to run just an AFC spring, I really liked the old super heavy governor spring from a 160hp pump, it wouldn't go full travel till 55 psi but it worked great for a hot truck that made 80 psi. But in towing situations it was horrible at times where you'd reach a wall of not enough boost to advance the AFC foot and you'd be stuck at say 30 psi overall boost and the throttle stopped up against the AFC foot so you're only option was to downshift and grab another gear or sit there wanting more fuel and not able to get it.