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Thread: How to improve 4.6 economy

  1. 13th August 2013, 09:08 PM #31
    Hoges
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    There's been a deal of discussion on Range Rovers.net replacing the Lucas injectors in the GEMS engine with Bosch and other injectors originally specified for the Ford Mustang see also Bosch 4.6L V8 Fuel Injectors and scroll down to post #4 for more detail ...hope this helps
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
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  2. 13th August 2013, 09:37 PM #32
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    Quote Originally Posted by wanglemoose View Post
    btw none of those are the same as the gems ones. the spray pattern from the originals is a straight squirt. originally when i put mine in the bench i thought they were stuffed so i tested a brand new one to find exactly the same spray pattern, there is almost no atomization in them at all. changed to the bosch ones and fuel economy went from 17 l/100 highway to 12 l/100. torque also increased with the change. on another note these engines are a very dirty running engine i would suggest doing a carbon clean too.
    I have only done the change on a 3.9 classic but got good results most notably smoother running and mid range acceleration .
    This vid might be better to show the non atomization of the Lucas
    [ame=http://www.youtube.com/watch?v=Emnax2J4FX4]comparison bosch 24 multec lucas bosch3 bosch yellowtop bosch22 - YouTube[/ame]
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  3. 15th August 2013, 01:28 PM #33
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    cal415
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    Anyone know part no's? i would like to give these a try in mine.

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  4. 15th August 2013, 01:50 PM #34
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    hmmmm new injectors could be good.

    But I still have to think 17l/100 for a fully loaded P38 with stuff on the roof on mixed roads is actually pretty good.

    When mine was young and spritely I would do Adelaide melb trips and get in the 12's.
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  5. 15th August 2013, 02:44 PM #35
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    how about 20l/100km ULP for unladen p38 mainly on the highway.... definetly something up there i think.

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  6. 15th August 2013, 03:40 PM #36
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    Quote Originally Posted by cal415 View Post
    Anyone know part no's? i would like to give these a try in mine.

    19lb Fuel Injectors Mustang Camaro Corvette Set 8 | eBay
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  7. 15th August 2013, 06:47 PM #37
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    cal415
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    Quote Originally Posted by wayneg View Post
    19lb Fuel Injectors Mustang Camaro Corvette Set 8 | eBay
    Thanks, are these the same as some have used ok the 3.9 discos? If so I will get 3 full sets as I have 2 3.9s as well

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  8. 15th August 2013, 07:00 PM #38
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    Quote Originally Posted by cal415 View Post
    Thanks, are these the same as some have used ok the 3.9 discos? If so I will get 3 full sets as I have 2 3.9s as well
    AFAIK yes they are compatible.


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  9. 15th August 2013, 07:13 PM #39
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    Cool thanks i will order a few sets and see how they perform, how hard is the swap? taking a quick look at the motor i assume the top of the intake needs to be taken off?

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  10. 16th August 2013, 05:02 PM #40
    Hoges
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    Quote Originally Posted by Robsrod 58 View Post
    Hoges, Is this some white man magic I see
    It was an "Average" over about 700 km section of a 2600+ km return Bris-Canberra trip. I was attempting to see just what might be possible...I filled up on the Newcastle expressway at that large service centre (Ourimbah?) on 95 oct. to the first "click" on the pump, and did not reset the trip meter etc. drove to Canberra then filled up again ...it was freezing cold... then topped up again at Pennant Hills on the way home. I snapped the photo somwhere on the Pacific Hwy near the Gosford turnoff ...I think. It was early evening, the weather fine and chilly and the temp was just on the "dew point" ...so the air/fuel charge was optimum. further the temp of the fuel in Canberra and Pennant Hills was such that I probably got a decent density...i.e. more mass of fuel per litre than on a hot day where the fuel can expand by 20% or more...and servo pumps are NOT to my knowledge corrected for temperature... (in the same way, notice when pilots talk about refuelling large aircraft they usually speak in terms of taking on "X" lbs of fuel" not necessarily litres/gallons...

    A pump volume/GPS distance calculation ultimately came to a shade under 11.5 L/100km for the whole trip.

    NOTE: I only do these "experiments" when driving without the co-driver to amuse myself oh yes and wave to other LR vehicles irrespective of model...
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)
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