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Old 12-06-2012, 12:55 AM   #1 (permalink)
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injectors hp ratings and mpg

Okay. Why do I see people posting that with 60 90 hp injectors they get better fuel economy then stock? I would think the higher hp rating the more fuel you would use. What are stock injectors hp rating?
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Old 12-06-2012, 03:16 AM   #2 (permalink)
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Ok I think I can answer this. The reason you see people talk about better mpg on bigger injectors is just like every other performance mod you hear about doing the same thing. It's about being efficient. If driven for better economy (keeping your foot out of it) then you can get better mpg because its running more efficiently. If driven hard I'd say you probably use more fuel than when driven hard on stock injectors because they simply don't put out as much fuel. That's the simple answer. Now as for stock injector HP. I can only assume that it would be zero when compared to performance injectors because they are giving you a HP rating over what stock already is. And be mindful that those ratings are not iron clad. They are estimates at best. Hope I answered your question


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Old 12-06-2012, 08:14 AM   #3 (permalink)
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When changing injectors, or nozzles, you change the spray pattern. Particularly on the Common Rail motors, that can have a HUGE impact on efficiency. 3 nozzles holes vs 4 or 5 or 6 makes a big impact, too. It totally changed the flame front as the fuel burns. As the fuel is used more efficiently, then less is needed for the same power level. i.e. 150hp on a stock engine would use X liters of fuel per minute. On a more efficient 150hp level, that same motor with better injectors/nozzles, would use 5%-15% less fuel.

Just because the injector is now capable of letting more fuel in the cylinder, doesn't mean that injector is always letting that amount of fuel in.

Clear as mud?

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Old 12-06-2012, 08:23 AM   #4 (permalink)
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So are we assuming that all 60/90ish HP injectors have more spray holes than stock? Or that they get a better spray angle?
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Old 12-06-2012, 08:30 AM   #5 (permalink)
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Good info!
I was actually wondering this myself as I was contemplating some 45hp injector tips for cheap.
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Old 12-06-2012, 10:40 AM   #6 (permalink)
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Yes we are assuming that. They wouldn't be better than stock otherwise. And test have been done to show this so it's not really a assumption. All injectors are different so some are better than others but if been around vehicles especially diesels for and period of time you understand that that's just the way it is with parts. performance or not


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Old 12-06-2012, 09:24 PM   #7 (permalink)
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thanks for the info every1
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Old 12-07-2012, 06:43 PM   #8 (permalink)
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i can say my millage did not go up with injectors at all i am running industrial 30LPM aka 100hp sticks.
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Old 12-07-2012, 07:10 PM   #9 (permalink)
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i imagine my mpg would go up if it could keep my foot out of it for a full tank...
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Old 12-07-2012, 07:25 PM   #10 (permalink)
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Quote:
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i imagine my mpg would go up if it could keep my foot out of it for a full tank...
Exactly I can get 12 mpg or I can get 20 all depends on the heavy right foot and have seen 22.3 city and highway combined with good fuel and double dose ps cetacean boost.
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Old 12-07-2012, 07:34 PM   #11 (permalink)
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Quote:
Originally Posted by 06speed View Post
So are we assuming that all 60/90ish HP injectors have more spray holes than stock? Or that they get a better spray angle?
Quote:
Originally Posted by davis21 View Post
Yes we are assuming that. They wouldn't be better than stock otherwise.
You can't assume that, because it's not true. You call up pretty much any injector company and order 90hp nozzles or injectors for an 04.5-07, it's still going to have the 5 holes they came with factory. Same with your 03-04 or 07+ 6.7, still going to have the same 8 holes as factory there.

Really the only time you're going to change the number of holes is mixing things, namely the Motorsport nozzles which are a 7 hole design.

The same is going to hold true for the spray angle; 04.5-07 is 124*, 03/04 is 143*, and 07+ 6.7 is 146*. The Motorsport nozzles are 143*.

Do they change the angle a little? Possibly. It's not going to be from a 124* to a 143* for example, maybe a couple degrees or so.

There's a thread on here (Exergy vs Industrial) that has some decent info on the mixing of 143* nozzles in 04.5-07 trucks, but it kind of petered out.

I don't know anyone changing the number of holes on CR injectors. I'll go ahead and say no one does.
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Old 12-08-2012, 05:13 PM   #12 (permalink)
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So the motorsports nozzles are supposedly the only 7 hole design? And they only come in the 03-04 spray angle?

Are they selling these and recommending them to 04.5-07 owners? If they say more holes is better for atomization, why isn't everyone doing this?
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