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Thread: lets put an END to the MYTH!

  1. 5th August 2009, 11:13 AM #51
    Dougal
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    Quote Originally Posted by c.h.i.e.f View Post
    wait my bad the latest sv6 commodore is producing 260HP or 264 metric HP so in other words the 4bd1T is 150Kw (200HP) when the new defender isnt making that much power and it has had hundreds of millions of dollars spent on the development
    The strength limits of the 4BD1T haven't been found yet.
    We have a guy who's popped head gaskets with 60+ psi boost. AFAIK he replaced the head gasket and is still driving it.

    The bottlenecks are:
    1. Stock fuel pump seems to be good for only 140 cc/1000 shots of diesel.
    2. Getting enough boost to burn that cleanly.

    140cc/1000 shots of diesel burnt cleanly at 3200rpm is going to give almost 200kw.
    You need north of 30psi and a very good intercooler to get enough air in at that rpm.
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  2. 5th August 2009, 11:16 AM #52
    B92 8NW
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    I reckon even my TF ute with humble 4ZE1 and 370,000 km would outrun my 300Tdi auto.
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  3. 5th August 2009, 11:17 AM #53
    Dougal
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    Quote Originally Posted by c.h.i.e.f View Post
    well that proves that it has a loud turbo whistle and that americans are prepared to goto extreme lengths to prove something but who on this site has had there 4bd1T tested on a qualified dyno? because knowing quiet well that a 1986 5 speed standard 4bd1 produces not even 50HP well something very special must be done to achieve more than 100hp
    I don't have a qualified dyno. I have a man-made viaduct of which I know the exact slope.
    Which is why I know I've got 75kw (100hp) at the wheels at 2000rpm in 4th.

    You can do the maths yourself.
    6.84 degrees.
    2.5 ton
    22.2 m/s.

    Nothing special, just more fuel and enough boost to burn it cleanly.
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  4. 5th August 2009, 11:24 AM #54
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    c.h.i.e.f
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    ok yep that does equal 100HP but im sure there will be other factors to take into consideration in about 1 min i will hav the exact specs of the 4bd1 and 4bd1T direct from isuzu ill see what that has to say to wether im incorrect and if so ill stand defeated
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  5. 5th August 2009, 11:36 AM #55
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    ok ill stand corrected at the moment the figures show 4bd1T at 79kw@3000rpm and the 4bd1 66kw@3200 rpm but it still doesnt explain why the 300tdi will pull over the gap (freemans water hole) in 5th and the 4bd1 would be back to 3rd
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  6. 5th August 2009, 11:38 AM #56
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    dullbird
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    I suppose it depends where the power is available...or perhaps the 4bd1 is not very well
    Our Land Rover does not leak oil! it just marks its territory.......



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  7. 5th August 2009, 11:38 AM #57
    Dougal
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    Quote Originally Posted by c.h.i.e.f View Post
    ok ill stand corrected at the moment the figures show 4bd1T at 79kw@3000rpm and the 4bd1 66kw@3200 rpm but it still doesnt explain why the 300tdi will pull over the gap (freemans water hole) in 5th and the 4bd1 would be back to 3rd
    You're looking at industrial specs.
    Automotive 4BD1T is 100-105kw stock.

    My 100hp to the ground is not my peak power. It's just one point on the curve.

    How stock is this 300tdi?
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  8. 5th August 2009, 12:20 PM #58
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    almost everything is stock
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  9. 5th August 2009, 12:49 PM #59
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    isuzurover
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    Quote Originally Posted by c.h.i.e.f View Post
    ok ill stand corrected at the moment the figures show 4bd1T at 79kw@3000rpm and the 4bd1 66kw@3200 rpm but it still doesnt explain why the 300tdi will pull over the gap (freemans water hole) in 5th and the 4bd1 would be back to 3rd
    From wikipedia:
    The 4BD1T is a turbocharged version of the 4BD1, it was produced from 1980 and was fitted to Isuzu NPR trucks from 1986 and sold in the US. Approx 100kw, 330Nm
    There were higher specced versions than this AFAIK.

    300Tdi in disco spec is about 83kW and 270Nm isn't it???
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  10. 5th August 2009, 12:53 PM #60
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    Quote Originally Posted by dullbird View Post
    60 pounds of boost at 55mph WOW

    i'm only kidding! not really sure what that video is showing other than he cant keep a camera straight it whistles alot and when on boost it gains a moderate 10mph
    He was driving around town so couldn't test it fully, and the engine was putting out so much power the torque converter was slipping.

    Power and torque from a diesel is directly related to how much boost you can put in (given enough fuel). As you spotted, he was getting 60psi of boost (almost 4x 300Tdi spec), and producing too much power and torque for any clutch or torque converter he has tried to-date.
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