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Thread: RD28 to TD42 conversion - revs too high HELP

  1. #21
    Legendary Rossco's Avatar
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    Unless they're not 4.1s does sounds high. Double check maybe. .

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  3. #22
    The 747 Winnie's Avatar
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    Quote Originally Posted by AB View Post
    Wish someone could test it for us as I've done 60 in 4th before not revving too high on 4:1


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    70km/h at 3500 rpm
    5th gear low range, 4.1 diffs and 33" tyres

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  5. #23
    Patrol God threedogs's Avatar
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    Maybe if its an electronic issue Killer Kustum Kables
    may be able to assist as well
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

  6. #24
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    Okay, so if the tacho is out, does anyone have any suggestions how I would go about testing & fixing this?

    Cheers

    Jess

  7. #25
    The master farter
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    Quote Originally Posted by jesskac92 View Post
    Okay, so if the tacho is out, does anyone have any suggestions how I would go about testing & fixing this?

    Cheers

    Jess
    Read my post budette. And PeeBee's response to my post. I'm guessing here is you issue.
    Last edited by mudski; 9th June 2017 at 09:39 AM. Reason: incorrect gender assumption. lol

  8. #26
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    Quote Originally Posted by mudski View Post
    I reckon the tacho is out of whack. When I did the conversion from ZD to TD in my GU, I sent the loom to Killa Kustoms to get it cut and shut to suit the TD. It came back with a little box in the loom which is for the tacho signal. This box is adjustable too so they must calibrate it or something to suit.
    I'm gonna guess you either dont have this box, or you do and it just not calibrated right. Theres no way you can do 100ks at 4000rpm in a TD. I had 4.3's in mine at it was at 2700rpm in 5th at 100ks. Now with 4.1's its at a nice 2450rpm. So you can't be at 4000rpm when you had 4.6's...

    As PeeBee said too, the RD box is different and wont fit the TD. So we know the box is right. Can you take a pic of where the speedo sensor mounts into the box too? The GQ and GU boxes are different to each other, but i have seen GQ TD boxes used in GUs. But the speedo pickup is different.
    If its a GU box, remove the sensor and tell me what colour the speedo gear is. Then take the car for a run with a GPS in hand that tells you the actual speed. We can then work out if you are actually going at the right speed too, if your speedo is out, you should be correcting this to by using a different tooth counted speedo gear.
    Finding different speedo gears for a GQ box is near impossible these days.
    Will have a look at the box over the weekend and let you know

    As for the speedo, I have done the GPS test and @ 100kph on the dash I was doing 104kph on GPS, so it's not out by much.

    I have watched a few TD42 0-100 video's on youtube and I can see what everyone is saying about how loud these engines are. It's my first TD42 and I've never actually owned a diesel before so it's all new to me. I used to be a Nissan Import kinda girl till I went bush haha

    Thanks all for your help. Will let you know what else I find in regards to the gearbox/tacho.

  9. #27
    The master farter
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    The tacho box thingo in mine is against the firewall under the dash, near the heater outlet. If that helps.

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