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Thread: Supercharged HSE 4.6

  1. #1
    Join Date
    Jun 2017
    Location
    Victoria
    Posts
    1

    Supercharged HSE 4.6

    Gidday there all..new to the website and Im hoping I can get some info from the extensive knowledge base here on supercharging a 4.6 P38 Rangie. I will be using the resources of Horsepower Engineering Australia KENNEBELL

    I guess Im after the learnings from people on here who currently own OR have done this to their 4.6 and what problems they encountered. I will be more than happy to post images and progress of the project as it develops but again, any insight to tuning issues/problems will be appreciated!

    Mak

  2. #2
    Join Date
    May 2003
    Location
    Sunny Coast QLD
    Posts
    25,865
    Welcome to AULRO.COM

    I am looking forward to your Project.
    I know the Gems V8's were supercharged by a company at some stage,,

    I havent read a lot on here about it...

    Bring it on
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to ???
    Its a gas gas gas Tug?
    Making Lemonade since 2016.


    Golf GTX Tourer MKIII 19' of Heaven


  3. #3
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    135
    Supercharging a P38 V8 basicly means replacing the ECU. That is to say, you would need a new map and thus a chip (two actually) in your GEMS ECU, the bosch thor has not been done yet afaik, or something like a megasquirt which you can piggyback onto the standard ECU. The reason for doing this is that the ECU en BECM just love to talk to each other, in code even and if one of them is not happy with what it is hearing, the engine will not start The reason that this is a problem is because starting the engine in a P38 is not actually a flow of electrons going through the ignition switch to your starter relay but a small signal to the BECM, which in turns sends out an electrical current to power the relay for your starter motor etc etc.

    There has been a bloke in the UK (where else?) that has done a megasquirt on a P38 GEMS, if you want to go that route I can dig it up for you

    AFAIK the supercharged P38's that came from the factory also actually bypassed the ECU. As did the overfinch blokes, they shoehorned a GM V8 in there for more power.

    In any case, great fun to squeeze more power out of those beauties! Mind you though that on a tired engine and driveline this can spell trouble...

    Cheers!
    -P

  4. #4
    Join Date
    May 2013
    Location
    Melbourne
    Posts
    3,990
    A pretty impressive website, but I couldn't find any specific mention of the 4.6 engine. Do they have experience with this engine, and if so have a specific kit for it?
    If they don't, wouldn't there be a few reputable Aussie companys like Harrop etc who may be able to assist?
    Finally, I don't know how much power, or how amenable this engine is to a supercharger, but I reckon it'd need internal upgrades as well, to cope with a supercharger?
    What about an LS3?
    Just a few of my thoughts, but I LOVE V8s (there's no substitute for cubic inches!), any V8, so I'm looking forward to your "journey".
    Good Luck, Pickles.

  5. #5
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,408
    Hi

    This site contains masses of info about the Rover V8, here is a page on forced induction

    Forced Induction and Nitrous

    Small block Chev install

    350 chevy conversion, fitting the engine

    There are also LS1 conversions around

    Good Luck
    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  6. #6
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,470
    My opinion, an LS3 and 6 speed auto would be less of a headache than supercharging the 4.6. As mentioned above, you'll get more power and torque plus better fuel consumption from an LS.

    From what I've read in the past, supercharged 4.6's don't get even distribution of air (or something along those lines) and you end up with some cylinders running lean, then bang!! There was one getting around here years ago! Didn't last long at around 7 pounds of boost.

    Cheers
    Keithy

    Green 2000 P38 Range Rover HSE - Gone
    Blue 1999 P38 Range Rover HSE - Gone

    Silver 2002 P38 Range Rover HSE - Sequential LPG, BCDC Charger, TPMS, Rear Locker, Wheel Carrier, Bullbar & Spotlights, General Grabber AT2's, Too Much to Mention!

  7. #7
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    135
    Keithy is right, there was indeed a problem with that! Mind you, that was a GEMS afaik and the air intake had not been sufficiently modified. The rover V8 can indeed be supercharged without trouble, but you would need to alter quite a few things

    I tried to find the link but can't find it if you have the patience to go through a lot of pages, check the rpi engineering facebook page. I'm pretty sure it was on there at some point

    -P

  8. #8
    Join Date
    Apr 2010
    Location
    Lower Hunter Valley NSW
    Posts
    314
    Supercharge it mate! Just don't plop the blower on top of your bottom section of the inlet manifold - unequal amounts of air going into the cylinders like those have already said. Mount it on the side and have it going to the stock upper intake via the throttle body. Piggy back your existing ECU by using a megasquirt controlling your fuel and spark. Happy days!

  9. #9
    Join Date
    Mar 2012
    Location
    Melbourne
    Posts
    19
    Hi all - my first post here. What brand/make/model supercharger is recommended and who sells them? Mine is a 1998 4.6 with a high spec rebuild and stroked to 5.0l - the people who did the rebuild say 'the engine will easily handle a low boost system' - but what's the first step - who do I approach? Any insights gratefully received. I'm in Melbourne. IMG_1595.jpgIMG_1605.jpg

  10. #10
    Join Date
    Mar 2012
    Location
    Melbourne
    Posts
    19
    Well, I'm not too good at uploading photos - I'm in Melbourne [but in Coventry UK for a couple of months before heading home]. Regards Andrew

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