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Thread: Speed in 4th td5 discovery

  1. 12th May 2014, 09:24 PM #1
    disco_potato
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    Speed in 4th td5 discovery

    What is a safe speed to sit on in 4th gear with a td5 disco 5 speed
    I tow my race car regularly and I have heard it is not a good idea to use 5th gear for towing. 100 kmh in 4th is around 3000rpm is that safe?
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  2. 13th May 2014, 06:26 AM #2
    MarknDeb Guest
    read the cars manual to see what it says RE towing speed and gears, if it says nothing you are able to do the speed limit in 5th
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  3. 13th May 2014, 07:00 AM #3
    disco_potato
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    Thanx. I didn't think of that.
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  4. 13th May 2014, 09:24 AM #4
    Tombie Guest
    I'd be towing on the flat in 5th...

    And then dropping back on inclines
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  5. 13th May 2014, 09:32 AM #5
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    Disco Muppet
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    ^ X2.
    Don't keep it in 5th under ANY strain.
    The Phantom - Oslo Blue 2001 Td5 SE.
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  6. 13th May 2014, 07:27 PM #6
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    Alex 110
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    drive by your egt's. Others may correct me but my understanding is they will be lower with more revs in a lower gear (within reason) for any given speed - especially under load
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  7. 13th May 2014, 07:36 PM #7
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    Quote Originally Posted by Alex 110 View Post
    drive by your egt's. Others may correct me but my understanding is they will be lower with more revs in a lower gear (within reason) for any given speed - especially under load
    I think the concern is gearbox strength rather than engine EGT.
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  8. 13th May 2014, 08:17 PM #8
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    Blknight.aus
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    depends on the weight your pulling and the general conditions. (wind, roof rack, surface conditions)

    I'll back tombies advice on this one.
    Dave

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  9. 13th May 2014, 08:52 PM #9
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    EGT's have a great way of telling you how hard your engine is working and henceforth how much strain is on your box. I tow a 2300kg van and while I use 5th, it has to be under the right conditions, ie, flat road, minimal headwind cool ambient ect. I try to not pull any more than 15psi boost whilst in 5th and under these conditions I can maintain the magic 90-95.
    Ideally, 4th is the go but the revs do get a bit tedious at times. Mechanical sympathy is the rule of this subject.
    Regards
    Robbo
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  10. 13th May 2014, 08:56 PM #10
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    Yorkie
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    4th and 3000rpm gets annoying so I use 5th on the flats bits and downhill keeping egt's under 500'C.
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