Author Topic: Cruising in 3rd and 4th gear  (Read 4205 times)

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  • gb United Kingdom
    Cardiff
Cruising in 3rd and 4th gear
« February 28, 2018, 14:21:42 »
Hello Everyone

From Cardiff (UK) here! I bought an i30 diesel manual in Cardiff 2015 registration this month. I realised that when at gear 3, it automatically cruises at 20mph and in the 4th gear it cruises to 30mph automatically and stays at that speed until I speed up or apply the break. Please note; I can accelerate if I want to. Is this normal? I tried to cancel cruise control but it’s not set up. Could anyone confirm this is a feature or at least how to turn it off?

Thanks


  • i30 UK owner

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  • england England
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Re: Cruising in 3rd and 4th gear
« Reply #1 : February 28, 2018, 14:30:30 »
Welcome cardiffian :D

I think you'll find that's called "diesel torque" and it's just a way of showing you how the engine can drive you forwards with no pedal power.

Very very common (and sometimes quite useful) :D
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  • gb United Kingdom
    Cardiff
Re: Cruising in 3rd and 4th gear
« Reply #2 : February 28, 2018, 14:38:35 »
HI Shambles

Thank you for your response.

I have not heard of this "diesel torque" phenomenon before. Is this normal in all diesel i30's?
« Last Edit: February 28, 2018, 14:53:50 by cardiffian » »
  • i30 UK owner

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  • dk Denmark
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Re: Cruising in 3rd and 4th gear
« Reply #3 : February 28, 2018, 14:46:45 »
Yes.  :D

At those speeds you're at so low rev's the ECU will keep the rev's adjusted to a minimum so you don't stall the engine.
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  • england England
    Yorkshire
Re: Cruising in 3rd and 4th gear
« Reply #4 : April 01, 2018, 03:07:01 »
Hello CardiffIan / Shambles / Asterix,

I had a similar question (my diesel i30 does the same) - thanks for the information!  Having never driven a diesel before it freaked me out a bit taking my foot off the accelerator at low revs to feel the car speed up.  Getting used to it now.

Cheers,

Paul.
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Re: Cruising in 3rd and 4th gear
« Reply #5 : April 01, 2018, 05:06:07 »
I never let my drivetrain on the car take any torque below 13-1350 RPM as it getting very unefficient at such low RPMīs with ECU trying to keep engine alive.

Slow RPMīs & extra fuel injected = Shock-load on drivetrain, bad economy (long term = sooting up engine & perhaps failure due to stressed engineparts) + you get less comfort.

Just personal opinion off course & welcome to the world of diesels where torque is everything & BHP "Just a figure"  :mrgreen:
 

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  • england England
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Re: Cruising in 3rd and 4th gear
« Reply #6 : April 01, 2018, 06:37:17 »
Thanks ChipMIK, much appreciated.
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Re: Cruising in 3rd and 4th gear
« Reply #7 : April 01, 2018, 07:14:48 »
Good, innit? I use it all the time in side streets. Lends some meaning to the old idea that some diesels just refuse to stall.  :D
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