Engine/Transmission (1998.5 - 2002) H/O injectors---how much H.P.?

[BWillard]

Picked up a set of H/O injectors for my truck, anyone have a guess what kind of HP gain this would be on my S/O? The truck currently has an auto so it has the smaller injectors to begin with which are smaller than a stick truck, right? So really I'm going up two sizes with the H/O injectors. Just wondering if I should go with the 275's or DDI's if this really isn't much gain.

 

[Mundgyver]

H. O. Injectors I have an H. O. but am not familiar with H. O. injectors. I do know that the VP-44 is different on an H. O. truck than a standard truck and also the turbo is different being an HX rather than an HY.



With just an EZ and my tuck in stock form other than a BHAF filter, I was at 262 hp to the ground. I have a 6 speed.



I have 275's now with an Edge Comp, BHAF filter, Rip-Rook4 inch exhaust and a FASS fuel system. I am right at the 400 mark when everything is turned up to maximum tilt in 5x5.



I have set my truck up for heavy towing.



You have an HY turbo and your VP does not put out the pressure of an H. O. designated VP-44. I don't know what the pressure difference is. Your automatic will absorb alot of your power, more so than a stick. This can be overcome with an upgrade of the transmission. You will also have the Dana-70 rear end.

 

[PC12Driver]

I'm pretty sure that the HO injectors actually flow less than the SO injectors. The HO gets it's additional power from the higher compression and mods to the injector pump. I'm thinking 275's or DDII's would be the way to go.

 

[KLockliear]

You will lose about 15-20hp putting the ETH (581) injectors in your ETC.

 

[Mundgyver]

You will lose about 15-20hp putting the ETH (581) injectors in your ETC.

Reason, please

 

[JR2]

I believe the reason is stated above, different VP, different compression, different engine set up. I know the HO injectors have a different pop off pressure too.



JR2

 

[isb360]

1) What are the differences between an ETC VP and an ETH VP? (Different internal solenoids, different duty cycles given to VP by ECM, etc)



2) If an ETC VP goes south, can it be viably replaced with an ETC VP pump?





Tim

 

[isb360]

1) What are the differences between an ETC VP and an ETH VP? (Different internal solenoids, different duty cycles given to VP by ECM, etc)



2) If an ETC VP goes south, can it be viably replaced with an ETC VP pump?





Tim

 

[Mundgyver]

My book says that if you have to replace an H. O. designated VP-44 pump, that it must be replaced with the same model and than putting the standard model on will create problems. Im at work right now so I do not have the reference in front of me. I can look it up when I get home tonight. I know it is the same with the pistons also and they go through something called grading.

 

[JBlock]

smaller holes and high pressure on the HO

The Ho's have higher injection VP pressure and smaller holes in the injectors.

 

[Mundgyver]

BWillard,

The Ho's have higher injection VP pressure and smaller holes in the injectors.

As JBlock stated above and in thinking about this, you might have a problem running the H. O. injector. If they have a higher pop off pressure than you pump can supply, basic fueling to the engine could be compromised. The higher pop off pressure requirement would explain why you would lose 20 to 30 hp as stated earlier.



Does this make sense to everyone

 

[BWillard]

Yeah, that makes sense. Anyone looking for a set of H/O injectors?

 

[Mundgyver]

BWillard,



When I replaced my injectors with the 275's the one thing that was pointed out to me for difference was that my stock (H. O. ) injectors as you called them, had 5 holes in them. The 275'2 came with 7 holes that were smaller in diameter. The explination that was given to me at that time by a very trusted Diesel mechanic in McMinnville, Or. was that the reason for more horse power was a better atomization of fuel because of the smaller holes and in that there were 2 more of them.



I picked up about 1 mpg when I installed them Research the pressure output of your VP and then look at the pop-off pressure of a set of 275's. I think that would be the key to deciding on which injectors you want.



I know that I am very happy with mine and have all the power I need. I'm not planning on going much beyond where I am now. I do know that if I elect to put my foot into the throttle at 40 mph on the freeway, nothing that Furd or Chubby builds has been able to keep up with me. That includes ones with stickers that say "BANKS" on them. Not saying I can't be beat, just have not run into one of them yet. I have a couple of guys here where I work that run Duramax and Ford. They are always kidding me about having a little truck cause I have the short bed and at one time declared that they had the better rig. Thats fine. When I offer to bring both trucks (theirs and mine) to the same weight and then put on the load of their choice to both at the bottom of a particular hill, they kind of hem and ha around and back of real quick.



I think you would be real happy with a set of 275's. And besides when you get use the them, you can always move up another 100 hp with a set of stage III from one of the vendors that prowl this forum. Good luck in you choice and have fun. -Wally-

 

[BWillard]

Mundgyver,



I kinda got the same thing going on here with a couple buddies. It's all in fun, but I want to be the winner of course I'm not looking for a drag truck just one that can tow the 5,000lb goose with a 5,000lb rockcrawlin' jeep on it----faster up hill than them! OH and in the process cover them in smoke:-laf I'm swapping out the auto for a NV5600 soon then comes the turbo and injectors. So any suggestions welcomed guys!