lacking power from my 190s
- Thread starter speedracer1000
- Start date
speedracer1000
New member
you have a good point. my plans were to use a 5/8 pickup tube or a sump to feed this inline pump I installed, but for the time being im using the stock pickup. im honestly not sure if a larger pickup or a sump would help or not.
kingranchstroker
Member
Did you replace your stock pump? Cause if that's failing your never gonna get your desired pressure . Doing a sump with larger supply hose will definitely get more fuel to the pump/ pumps...
speedracer1000
New member
no i didnt replace it i jus added this pump behind it kinda like a helper pump. didnt know if it would work or not. i was wondering about how it would do tryin to push thru the stock one. it did help but didnt totally fix it
Mike@MPD
New member
The tune should not be the issue
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MorganY
New member
Thats why. Replace the factory pump and you'll be where you need to be. I would replace it ASAP. Injector damage happens everytime pressure drops past 45psi.
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OBS F350
New member
Might be an issue with ICP. My renegade 190/75s only hit like 3.6 volts tops on a full fuel tune. Still feels like it pulls hard but I bet I'm missing out on some power. Holds 4.8 on an econ tune or stock. Just on the fence if I want to run them or buy brand new ones and have mpd/RCD or someone build them. Probably not worth having these old injectors modified again if its even possible for the ICP issue to be fixed with them.
MorganY
New member
I always find this a hard pill to swallow, even though it seems to be a rule of thumb on the boards. My fuel pressure holds steady at 68psi at idle and ~58psi under WOT. I'm on a relatively new stock pump, old style fuel filters, better flowing banjos up front and the blue spring, on STOCK injectors with a race tune. But if I simply put my fuel pressure sending unit in the BACK of the heads... pressure drops to 25psi, even on lesser tunes... just food for thought. A lot of guys measure up front and almost no one measures in the back. Whether it actually causes damage or not... who knows, but I think some power is likely left on the table without consistent pressure across all 8 injectors.
As far as pumps go, a lot of guys just use pusher pumps to feed the stockers, seems to work good for most. Though at some point with larger injectors I would want a better high pressure pump like a fuelab.
OBS F350
New member
Yea I can't really talk bad about Sheldon he helped me out a TON with my truck and saved me a ton of money but I was disappointed to find out later that the injectors are poorly build or modified in the wrong way. If I decide to go further with performance on my truck I will probably have brand new ones built but as of now i will just run them and build a car to go fast and tow with the truck. Op if you have a way to monitor ICP voltage I would check that out after you get your fuel pressure figure out.
speedracer1000
New member
i checked icp with the scan tool on the tow tune i been running and its at 4.8.. ipr % is around 84. havent checked on the hotter tunes.
speedracer1000
New member
i jus got matt 'to write me 3 tunes today. i been wantin to try his anyway. mine need updated. dont get me wrong even on extreme street and 30-35 psi wot the truck runs strong pulls good.. i can tell an improvement from before i added this pump. now if i could jus get it to hold at least 50 i could eliminate the fuel issue. that might take care of it all. i never ran the truck at the track or on the dyno so idk where its at power wise, right now id have to guess its around 450 ish. it runs slightly better than erics race tune with stock injectors and turbo did. extreme street is the hottest i have now
MorganY
New member
Do you have any bigger tunes than a tow file? If so, run it, then check icp.
Edit: Tree'd by OP
Fuel pressure below 50psi will hurt power.
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speedracer1000
New member
that's kinda what I thought... the way I see it a efi gas engine suffers a lot from low fuel pressure. no reason y this should be any different.
speedracer1000
New member
something else I been thinking about too.... the reg return setup im running still uses the factory fuel bowl and feed lines... im using 6.4 banjos but im wondering if my pressure loss is right there. I mean those holes the fuel has to flow through is pretty small, maybe the fuel cant fill the head fast enuff to keep up with the demand from the injectors through those banjos. and the gauge is on the regulator after the heads. so whats yalls opinion on that?
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MorganY
New member
Totally different from gas injectors. Low fuel pressure does not affect near as much as low icp. Unless fuel pressure is drastically reduced. Low icp ruins power. Low icp means you drop injection pressure in the cylinder by a factor of 7 for every psi of hp oil you drop.
If you have 40 psi, you are scoring the internals of the injector from lack of lubrication. Replace your dead factory pump, leave the helper pump in and be done with it. Then datalog all relative PIDs and go from there. Switching your banjo bolts back to stock aren't going to give you 15 psi, forget them and leave them there.
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speedracer1000
New member
i wasn't thinkin on putting stock banjos back in more like replacing them with a different fitting and line all together. aren't the banjo bolts acting more like an orifice? and you think just get a new stock pump and run it with the helper?
01PSD
New member
New stocker is where I'd go as well.
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