Tune or pump it up then tune?

inline6power said:
its got a 57mm over 66mm. its bd tow twins. not ideal for high hp but perfect for 400. injectors are ddp 4s which came with the truck. denny pin and timing is maxed without skipping a tooth. a little tunning on the pump and its pretty easy to drive with no smoke yet anything taking off.
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A good example of conservative parts that work well for the setup/goals.
 
Would not a larger injector crate bigger fuel droplets which, in my head anyways, burn longer and then get the fuel injected quicker because of the steeper drop in pressure?

also to help explain the less timing required with bigger pumps and larger injectors would be more fuel trying to be pushed in the same size injector.

Meaning, a 5x12 injecter having a 12mm head would in theory have the same droplet size as a 13mm pushing through a 5x18 with the same stroke. The 13mm is obviously pushing more fuel but less timing is required because off smaller fuel droplets.

Or do i have something mixed up?
 
inline6power said:
my chevy cummins with a ve setup is right at 400 and gets 18.4 hand calculated. its got a 57mm over 66mm. its bd tow twins. not ideal for high hp but perfect for 400. injectors are ddp 4s which came with the truck, not my first choice. denny pin and timing is maxed without skipping a tooth. a little tunning on the pump and its pretty easy to drive with no smoke yet anything taking off over 1/8 will leave a small cloud due to the injectors. truck is also a 5 speed.
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:poke:You need to post pics of your junk...it's pretty badass as far ass VE-powered trucks go, Chevy or not.
 
oldestof11 said:
Or do i have something mixed up?
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Droplet size isn't really a concern, the reason a larger orifice injector is used is for sheer volume and spray penetration. If the needle actuates correctly, a large orifice injector can atomize very well.

The injector will never "outflow" the pump, meaning no return fuel through the holder, so it essentially cannot decrease the time the pump requires to go from SOI to spill port.
 
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JQmile said:
:poke:You need to post pics of your junk...it's pretty badass as far ass VE-powered trucks go, Chevy or not.
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thanks Jason. i will try to post some here in a bit. really need to wash it lol. but i will see what i have on my phone and throw em up here.
 
this is all i have right now Jason. wiring is completely redone, as well as the interior. looks like a brand new truck now. these pics are kinda old. i will take some recent ones with the engine bay all cleaned up.
 

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At 60psi egts never get above 1350. Has a radiator mounted up front with a marine pump that circs water. Water temps have never got hotter than 190. Seems to work fairly decent

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Inline 6 power truck looks sweet bud:rockwoot:

Smokem thanks for the education.
Appreciate it, the search button would have never made it so clear.
Also since you know my goals and I know you know injectors
Please pm me a price and recommendation for the p pump swap.:Cheer:
 
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