Effects of larger injector on wire tap box- ETC vs ETH

[Hohn]

For a long time, it has been perceived that an ETH usually only gains an additional 30hp or so by tapping the wire. But i wonder-- is this only valid for stock injectors?



Once you get into injectors, would the power difference between wire tapped and not tapped on an ETH get bigger? I theorize that the larger injector passes more fuel on the secondary injection pulse that fueling boxes generate. So since it can pass more fuel in this same amount of time, shouldn't tapping the wire give you proportionately more power?



My thinking is that a wire tap with stock injectors will net only 30-40hp more on an ETH.



What about a stage 2 injector? Maybe a 90 hp difference?



How about stage 3 injectors? 100+hp difference?



Can anyone verifiy my thinking here with dyno #s?



I am thinking about my next setup, and I am not going to tap the wire if it's only 40-50 hp more.



HOhn

 

[KLockliear]

Typically, the Comp/UFM will make about 95hp on a stock ETH in 5x5. We have seen up to 125hp gain on a truck with Stage 3 injectors, so yes, bigger injectors allow the box to deliver more power than it can with stock injectors.



ETH (220rwhp) + Stage 2's (+90rwhp) = ~310hp

ETH (220rwhp) + COMP/UFM (+95rwhp) = ~315hp

ETH (220rwhp) + Stage 2's (+90rwhp) + COMP/UFM (+95rwhp) = 440rwhp*



ETH (220rwhp) + Stage 3s (+115rwhp) = ~310hp

ETH (220rwhp) + COMP/UFM (+95rwhp) = ~315hp

ETH (220rwhp) + Stage 3's (+115rwhp) + COMP/UFM (+95rwhp) = 465rwhp*



* denotes these setups were with an HX40 size turbo (completes the package).

 

[Diesel Freak]

Kieth, on the trucks with the HX40, were the dyno runs made in direct or OD?

 

[KLockliear]

5th Gear. Around 450hp, they make more power in 6th.

 

[Hohn]

Thanks Keith-- I guess we have heard from an authority here, and that settles it for me.



I am thinking that I have to do other stuff before I can tap the wire. With DD2 and EZ, I am near the max airflow of stock intake, exhaust, and turbo. I have not had any EGT problems, but I think the wire tap would surely change that.



Keith, since I have you here... I have a lopey idle with my DD2s. I know that Rod has been in contact with you on this. I also know that DD is always researching and upgrading their injectors. I honestly can't see anything I did wrong on the install- my FP is solid and I have no leaks. My oil level isn't growing, nor does it smell fuelish. My mileage is unchanged, even though I am NOT driving conservatively.



I don't see this VERY slight lope as a problem, more as an annoyance, and I would like to know that everything is OK.



J Hohn

 

[KLockliear]

Some trucks exhibit that. It's rare though. Is it something you hear or see in the tach or something you can feel? I assume it smooths out as soon as you come off idle?



With Stage 2's, adding the UFM/COMP will require an AFE airbox (or similar), HX40 sized turbo, fuel line upgrade, pusher pump kit, gauges, 4" exhaust and a clutch.

 

[Hohn]

Correct, Idle is the only time it appears. It's something you can hear and feel. . the tach is no less wobbly than it was stock. So far, it's been harmless, so I have no reason to worry-- it's more just a curiousity of mine.



I have gauges. I will be adding the other requisites over the coming year(s). I figure that the EZ+2s combo is more than enough power for a while, giving me plenty of time to get the intake, exhaust, clutch, and other things required to REALLY move some fuel.



HOHN

 

[Sticks]

Originally posted by KLockliear



ETH (220rwhp) + Stage 2's (+90rwhp) = ~310hp

ETH (220rwhp) + COMP/UFM (+95rwhp) = ~315hp

ETH (220rwhp) + Stage 2's (+90rwhp) + COMP/UFM (+95rwhp) = 440rwhp*



ETH (220rwhp) + Stage 3s (+115rwhp) = ~310hp

ETH (220rwhp) + COMP/UFM (+95rwhp) = ~315hp

ETH (220rwhp) + Stage 3's (+115rwhp) + COMP/UFM (+95rwhp) = 465rwhp*



* denotes these setups were with an HX40 size turbo (completes the package).

Are these actual dyno numbers with the combinations, or just the math? I think that I remember reading somewhere that 50hp over stock injectors, and 50hp over stock box/module does not = 100hp over stock when combined. It would be more like 80hp. I don't know myself, just trying to get educated.

 

[KatDiesel]

Originally posted by sticks

Are these actual dyno numbers with the combinations, or just the math? I think that I remember reading somewhere that 50hp over stock injectors, and 50hp over stock box/module does not = 100hp over stock when combined. It would be more like 80hp. I don't know myself, just trying to get educated.

Those would be dyno numbers, Keith works at Diesel Dynamics.



And if you know how to do the math it will add up regardless of what you read on here Least mine have alsways added up pretty close, but its jsut something you learn over time.

 

[mopars1]

The figures for the ETH and DDII injectors are right on. My figures from two different dyno shops (same brand dyno) was 310 and 314. With the EZ box added I hit 352 rwhp. For what it is worth, I also have the stock clutch that has never slipped yet and the injectors are over two years old, just in case there has been some changes made in the injectors.

 

[jtisdale]

I have a set of DDIII's that were originally bought for an ETC, will that matter?

 

[KatDiesel]

Originally posted by jtisdale

I have a set of DDIII's that were originally bought for an ETC, will that matter?

Nope won't matter. They will make more hp installed in an ETH then they would in an ETC without any boxes turned on.