injectors and timing

[Scrappy]

This is my ?, how do the different performance injectors affect timing?

I have Flux 2. 5's and I bought a VA C5 that was custom tuned for a truck with the same mods but running DDP 120 hp injectors. The other truck had very little timing rattle with the C5 but mine rattles so bad it actually will buck/hesitate and throw codes.

Are the DDP injectors honed tips with stock spray angles? That is what I thought I had heard. Flux injectors are EDM'ed on new blank tips, I know they are in the 1's and I thought I heard that the Flux 2's are just honed out Flux 1's? What is the difference between the 2's and 2. 5's? Spray angles? honed more/less?

how do the spray angles in the Flux injectors affect timing versus stock angles? advance it? or retard it?

 

[Tinman]

Bigger injectors don't actually change timing but they functionally advance timing. That is to say, the injection event(s) start at the same time reguardless of injectors size, but a larger injector will deliver more fuel sooner therefore functionally advancing timing. The bigger the injector, the more the advance.



DDP injectors are honed so they have stock spray angle.



Flux inj. are EDMs and have a narrower spray angle in the 03 and 04 trucks. (The 04. 5 trucks have a narrower spray angle stock. You can search here to get the exact numbers). Spray angle shouldn't effect timing but will effect combustion efficency. I don't think any Flux injectors are honed but maybe.



I don't know why your truck would act up so much since it was "tuned" for 120 hp injectors. I'd try going back to stock timing then go from there.