i30 Owners Club

GOT PROBLEMS OR ISSUES? => DIESEL => Topic started by: cardiffian on February 28, 2018, 19:21:42

Title: Cruising in 3rd and 4th gear
Post by: cardiffian on February 28, 2018, 19:21:42

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

Title: Re: Cruising in 3rd and 4th gear
Post by: Shambles on February 28, 2018, 19:30:30

Welcome  :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

Title: Re: Cruising in 3rd and 4th gear
Post by: cardiffian on February 28, 2018, 19:38:35

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?

Title: Re: Cruising in 3rd and 4th gear
Post by: Asterix on February 28, 2018, 19:46:45

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.

Title: Re: Cruising in 3rd and 4th gear
Post by: paulemmo on April 01, 2018, 08:07:01

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.

Title: Re: Cruising in 3rd and 4th gear
Post by: guest9517 on April 01, 2018, 10:06:07

I never let my drivetrain on the car take any torque below 13-1350 RPM as it getting very unefficient at such low RPM´s with ECU trying to keep engine alive.

Slow RPM´s & 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:
 

Title: Re: Cruising in 3rd and 4th gear
Post by: paulemmo on April 01, 2018, 11:37:17

Thanks ChipMIK, much appreciated.

Title: Re: Cruising in 3rd and 4th gear
Post by: The Gonz on April 01, 2018, 12:14:48

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