What kinda FP are you OBS guys seeing w/ big injectors and stock fuel system?

[always-strokin]

Just curious. What are you guys w/ big injectors/turbo seeing for FP when WOT w/ the stock fuel system (read: non e-fuel)? What kinda drop between cruising and idle are you experiencing?

 

[bad12jr]

What's considered big? To me 300 plus is big. Which no one in there right mind would do with a stock fuel system.

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[CSIPSD]

Define big injectors...

 

[Curtis@Vision Diesel]

Define big injectors...

Cough......cough :naughty:

 

[always-strokin]

i'd say, maybe 180s and above? More specifically, 238/100s. I know charles has said he mad 633whp w/ 39psi and he doesn't believe FP is a huge factor, but I'm just curious what a mechanical FP would dip to w/ hybrid 238s.

 

[Gearhead]

It will not be enough and you risk killing your injectors...... Why try and find out?

 

[Nodge]

I ran my 238/100 on a new stock mechanical pump. It's not enough to run them. I wasn't monitoring pressure, but when the truck bucks and jerks and surges, it's pretty obvious it wasn't keeping up.
It did run fine in the lower tunes until I got my E fuel rigged up.

 

[always-strokin]

^What kinda hp/tq did you put down w/ the mechanical pump vs the efuel? You have an impressive looking setup that I'm actually looking to get also (well, close to it anyhow).

 

[Nodge]

Never been dyno'd.
The stock pump will not support them when run hard, you really need e-fuel.

 

[jschildm]

I think its more about not starving on fuel and damaging the injectors than it is about the horsepower gains by going to e-fuel.

 

[backwoodsboy]

11psi with 238/100 and a 'healthy' mechanical pump. This wasn't WOT either, about 2/3 throttle trying to purge air out of HPO lines.
E-fuel went on later that day.

 

[always-strokin]

^Yowch! Thats terrible. What kinda FP did you have @ idle?

 

[m j]

these guys are trying to warn you that the fuel is also the lubricant for the moving parts in the injector
no fuel = metal on metal with a few thousand lbs of hydraulic pressure pushing down on it

 

[EASH]

my old truck with 175/30s strong mechanical pump FP would drop to 13 psi at WOT changed to Efuel system with a SD pump regulator set at 60 psi and i couldn't make the pressure drop