Dodge Ram 2500 Diesel fuel injectors

• posted on August 24, 2006, 1:07 am
I met a guy who recently had his fuel injectors replaced on his 2001 Dodge Ram 2500 diesel (Cummins 5.9L). He tells me he gets 25 MPG with these new
Robert Bosch RV fuel injectors. Before he got only 19MPG +/-. He showed me his overhead display for that tank, as proof of his claim.
Has anyone else seen this type of gain with these?
Tim

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• posted on August 24, 2006, 2:53 am

If he's going by the overhead, he's fooling himself. The 275 RV injectors have a larger opening, and deliver more fuel for the same amount of 'ON' time as the stock injectors. This develops more power, and therefore less 'ON' time is needed for the same power output as the stock injectors.
The computer has no way of measuring the fuel flow through the injectors - it knows that at a certain RPM, and a certain amount of 'ON' time will deliver a certain amount of fuel. It uses those assumptions to calculate fuel economy.
Miles travelled per tank of fuel is the only reliable way to calculate fuel economy, and then only if you fill to the same level each time.

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• posted on August 24, 2006, 5:22 pm

Don't trust the overhead computer readout. Mine is 1.5 miles per gallon off. The real test is the old fashion way of using your brain and calculating the mileage.

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• posted on August 24, 2006, 5:31 pm

While I can't speak for a Dodge, the readout on my Duramax is also off slightly compared to my actual calculations, but it's consistent. While it may not give dead on numbers, it's easy to see trends. I think it would be close enough to show an increase from 19 -> 25, although in reality it may be 17.5 -> 23.5.
Does the Doge have an "instant" mpg readout?
DJ

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• posted on August 25, 2006, 2:09 am

Dodge
new
showed
As said by Tom L, if you change the injectors with ones with a different flow rating from the originals, the mileage readings from the trip computer are now meaningless.
--
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• posted on August 25, 2006, 3:43 am
I think you mean "even more meaningless" right?
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Laszlo Almasi

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• posted on August 25, 2006, 7:29 pm
Actually, I am impressed on how close many of them are considering that it is all done by pure calculation but you are correct, even more meaningless :-)
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