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Thread: RD28 to TD42 conversion - revs too high HELP

  1. #11
    Administrator AB's Avatar
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    Quote Originally Posted by garett View Post
    other wise is it in low range ? ..
    Yeah right, no one even asked that?


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  3. #12
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    Is this a joke - 100kmhr in low range? Mine does 30k in 5th at 2000rpm

  4. #13
    Administrator AB's Avatar
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    4000rpm in 5th. I reckon it could be close to 100kmh. Highly not recommended of course!

    Give it a whirl PeeBee and let us know how you go


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    The 747 Winnie's Avatar
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    Quote Originally Posted by AB View Post
    4000rpm in 5th. I reckon it could be close to 100kmh. Highly not recommended of course!

    Give it a whirl PeeBee and let us know how you go


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    Nah man I get 50-60kph tops in 5th low range.

    Sent from my SM-G935F using Tapatalk

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    Quote Originally Posted by Winnie View Post
    Nah man I get 50-60kph tops in 5th low range.

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    New engine, redline is 3200rpm, Marks 85% reduction gears, so don't think I will even try!

  7. #16
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    Quote Originally Posted by jesskac92 View Post
    I have changed front and rear ratios, yes

    I'm waiting on a tacho reader, we live in the middle of nowhere so eBay is my friend.

    I'd like to think the tacho is wrong but it really doesn't sound like it, it's really singing at 100kph.
    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.

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    Administrator AB's Avatar
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    Quote Originally Posted by Winnie View Post
    Nah man I get 50-60kph tops in 5th low range.

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    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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    The 747 Winnie's Avatar
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    I'm going down the street in an hour or so, I'll test it then.

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    Tacho isnt reading correctly. Dropping from 4.6 to 4.1 will net a greater rpm drop than 200rpm

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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.
    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. Yes, my conversion has this same box, as I am running a TD42 box and RB30 Tacho. With 3.9 diff ratio, checked against the GPS I am smack on 100klm on the speedo and GPS.
    Last edited by PeeBee; 8th June 2017 at 11:39 AM.

  12. The Following User Says Thank You to PeeBee For This Useful Post:

    mudski (9th June 2017)

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