Engine/Transmission (1998.5 - 2002) Injectors and Mileage Questions

[rjrkihap]

Hi All,



I'm looking to replace my failed Quadzilla M3 and would like to avoid electronics. I liked how the Quad improved my mileage (a bit) and gave me a small bump in power (maybe 30 extra transmission safe horsepower). I have read people claims about injectors yielding an improvement in mileage. My questions are:

1. How does installing larger injectors improve mileage? You would think larger injectors yield more fuel and less mileage.

2. Is the price of the injectors worth the benefit of the increased mileage they will yield?

3. Assuming 1 and 2 are true, will the smallest injectors yield an improvement in mileage, ie. 275RV injectors {as I don't want to endanger the transmission}?



Thanks



Ron

 

[Rattler]

When i added the 275 injectors, i gained about 1 mile per gallon. Whether or not they will pay for themselves, i don't know. I put them in about 140k ago. The way a bigger injector gets better mileage(as was explained to me) is that a larger injector can give the fuel when needed, not late in the cycle as a smaller injector has to. Randy

 

[rjrkihap]

Thanks Rattler



Does anyone know if the aftermarket injectors actually atomize the fuel any better than the stock injectors. If so, does this add to the improved mileage? I also read somewhere that the aftermarket injectors use more holes than the stock injectors. I assume this would be to allow more fuel per injection?



Ron

 

[Sticks]

It depends on the injector. There are a lot of extruded/honed injectors out there that are OEM injectors with the holes bored out to a larger size, then there are complete new ones from blanks with an additional hole.



Yes, more fuel = more power (in crude terms, other things going on as well). More power means the engine does not have to work as hard on acceleration and maintaining speed.



The final bottom line is the mileage is all in your right foot.



Figure on $300 - $400 for a low end set of replacement injectors.



15 mpg @ 37 gallons = 555 miles per tank and $. 20 per mile

37 gallons @ $3. 00 = $111. 00

Possible claimed gain of 2 mpg with new injectors (best case)

2mpg @ 37 gallons = 74 miles

17mpg @ 37 gallons = 629 miles per tank and $. 17 per mile improvement

$13. 05 savings per tank.

23 - 31 fuelings or 14,467 to 19,499 miles to pay for injectors.



Funfactor = Oo.

 

[rjrkihap]

Thanks Sticks, great explanation.



Ron

 

[BEnglish]

It depends on the injector. There are a lot of extruded/honed injectors out there that are OEM injectors with the holes bored out to a larger size, then there are complete new ones from blanks with an additional hole.



Yes, more fuel = more power (in crude terms, other things going on as well). More power means the engine does not have to work as hard on acceleration and maintaining speed.



The final bottom line is the mileage is all in your right foot.



Figure on $300 - $400 for a low end set of replacement injectors.



15 mpg @ 37 gallons = 555 miles per tank and $. 20 per mile

37 gallons @ $3. 00 = $111. 00

Possible claimed gain of 2 mpg with new injectors (best case)

2mpg @ 37 gallons = 74 miles

17mpg @ 37 gallons = 629 miles per tank and $. 17 per mile improvement

$13. 05 savings per tank.

23 - 31 fuelings or 14,467 to 19,499 miles to pay for injectors.



Funfactor = Oo.

Now that’s the kind of rationalizing I can get behind!

ben

 

[KBrennan]

Has anyone used the DDP Dynomite diesel Injectors? Are they any good?

 

[Joe Mc]

I've only used Formula 1, Mach sticks. F1 Mach injectors.

You get what you pay for. Be wary of some of the less expensive ones out there as they are just "tips" that you install and then have to be pop tested/adjusted to be within similar pop psi.

 

[KBrennan]

I've only used Formula 1, Mach sticks. F1 Mach injectors.



You get what you pay for. Be wary of some of the less expensive ones out there as they are just "tips" that you install and then have to be pop tested/adjusted to be within similar pop psi.

So are you saying the F1 Mach injectors ar ebasicaly plug and play?

 

[firefighter_2000]

OEM Injectors

I bought a set of brand new OEM Bosch 275 injectors last year. I paid right at 600 for the set. I emailed back & forth with Joe Donnely a few times and found that by the time I got them mailed to me & all, it was roughly the same price. The guy at Arkansas Fuel Injection said not all aftermarket injectors are bad, but there are some companies out there that dont have the necessary equipment to test & set a reman injector correctly, and that some will take old injectors and add new nozzles without testing or making sure the pop off pressure is set correctly. He recommended using new oem injectors just for peace of mind... Which was good enough for me... I bought the set and couldnt be happier. Initially, I had trouble keeping my foot out of it but that has calmed down some. The fun factor was DEFINITELY there.

Craig

 

[KBrennan]

I found the Bosh 275 RV injectors at PDT Diesel Performance for $330. 00 but seem sa low price. Has anyone bought form these folks before and are they reputable/



PDR Diesel Performance: Bosch 275 RV 40HP Injectors 1998. 5-02 Dodge Cummins

 

[SWC]

KBrennan, I am surprised no one responded to your question. PDR Diesel Performance has been around a long time and can be trusted.

I have RV 275s and they were a nice power addition. However I am considering going with F1 Mach injectors. They seem to be cleaner burning.

Just my opinion.

Stan

 

[KBrennan]

KBrennan, I am surprised no one responded to your question. PDR Diesel Performance has been around a long time and can be trusted.

I have RV 275s and they were a nice power addition. However I am considering going with F1 Mach injectors. They seem to be cleaner burning.

Just my opinion.

Stan

Well I was wondering since no one said anything so I went to Midwest Fuel Injection out of IL. They were 430 more but shiped in three days and they are a US company.

 

[ILIANBG]

I bought my RV275 for $305, from Piers. That's about what those cost. A lot of people are overcharging, but you can still find a brand new RV275 around $300~$350.
Good luck.
Ilian

 

[KBrennan]

Well I was wondering since no one said anything so I went to Midwest Fuel Injection out of IL. They were 430 more but shiped in three days and they are a US company.

I goofed, they were only $34. 00 more. Total cost with three day shipping was $382

 

[jeepit]

Well I was wondering since no one said anything so I went to Midwest Fuel Injection out of IL. They were 430 more but shiped in three days and they are a US company.

Let us know how you like em!!

 

[Beast2B]

Just my observation, but I think many will agree--
the small timing advance from tuning box or Smarty made a MUCH larger difference in gained mpg than injectors. Use a Smarty programmer if you want to avoid electronics, but you will need a boost cooler of some sort to keep from setting an overboost code.

 

[KBrennan]

Just my observation, but I think many will agree--

the small timing advance from tuning box or Smarty made a MUCH larger difference in gained mpg than injectors. Use a Smarty programmer if you want to avoid electronics, but you will need a boost cooler of some sort to keep from setting an overboost code.

I already have the Banks Stinger kit withe the Big Hoss tuner. These new injectors should compliment that very nicely dont you think