About 4 months ago I installed some 5x.016 injectors in my truck with a stock turbo. I didn't *have* to change injectors, but I figured I may as well upgrade them now and never need to upgrade them again. Here's my experience.
The biggest concern of mine and that I saw here on the forums was that they would be uncontrollably smoky. Another concern I read was that they would easily overwhelm a stock turbo. So far, however, I have not seen either of those effects.
When I installed the big sticks, I also swapped the stock AFC spring to one of the big springs from the stock governor. I didn't notice any extra smokiness, but I also noticed a pretty big lack of power, too. What happened was that the governor spring was far too stiff and would barely increase the fuel even with a lot of boost. What I wound up doing was using the stock spring with a couple smaller springs put inside, effectively stiffening the spring rate. I have realized that the star wheel and preboost can only adjust the response so much, while the spring rate is really quite possibly the most important factor.
Yes, it will smoke some if I keep my foot in it, but it is easy to keep it under control. It has fast boost-building ability and doesn't block out the sun. Furthermore, I think it behaves better under high loads with the bigger injectors, but that is a fairly subjective observation (since I tow dismally inoften).
As far as idling and low-load operation, I haven't noticed much difference at all. From my experience, I would say that big injectors are very controllable if you just take the time to get the AFC right.
The biggest concern of mine and that I saw here on the forums was that they would be uncontrollably smoky. Another concern I read was that they would easily overwhelm a stock turbo. So far, however, I have not seen either of those effects.
When I installed the big sticks, I also swapped the stock AFC spring to one of the big springs from the stock governor. I didn't notice any extra smokiness, but I also noticed a pretty big lack of power, too. What happened was that the governor spring was far too stiff and would barely increase the fuel even with a lot of boost. What I wound up doing was using the stock spring with a couple smaller springs put inside, effectively stiffening the spring rate. I have realized that the star wheel and preboost can only adjust the response so much, while the spring rate is really quite possibly the most important factor.
Yes, it will smoke some if I keep my foot in it, but it is easy to keep it under control. It has fast boost-building ability and doesn't block out the sun. Furthermore, I think it behaves better under high loads with the bigger injectors, but that is a fairly subjective observation (since I tow dismally inoften).
As far as idling and low-load operation, I haven't noticed much difference at all. From my experience, I would say that big injectors are very controllable if you just take the time to get the AFC right.
arty018:
Spring rate makes a much bigger difference than people give it credit for. Found one at ace hardware that completely changed how my truck ran. Starts moving at 10-12psi, and full travel with no coil bind at 40-42psi. Night and day difference from the stocker.
