[Duke750]

Had an interesting drive on the weekend up the Bruce Hwy to Rainbow Beach. On a number of occasions either going up a hill, overtaking or just accelerating the tacho would increase through 2,000-2,400 rpm and then rev up to 4,000rpm without changing gear. Very disconcerting.

I30 has only done 45K, and just had 45K service.

Going to dealer tomorrow.

[agentr31]

did the engine speed actually change or just the tacho...

"could" be a slipping clutch...

[Dazzler]

did the engine speed actually change or just the tacho...

"could" be a slipping clutch...

Sure sounds like it (or an ECU glitch?)..

Hope it is an easy fixed (not commonly reported on here) 

[agentr31]

wait... its says "automatic over-revs"

might be nasty if the auto is doing silly things... autos are never cheap to rebuild...

[Dazzler]

wait... its says "automatic over-revs"

might be nasty if the auto is doing silly things... autos are never cheap to rebuild...

   (It is easy to not read the heading .. just the first post.. and get confused)

[Duke750]

I assume that this is covered under warranty.

No, the engine speed did not change. My initial response was "bands". Do they still have "bands" in auto transmissions?

[Dazzler]

I assume that this is covered under warranty.

No, the engine speed did not change. My initial response was "bands". Do they still have "bands" in auto transmissions?

Only in CVT ones I think (but I am no mechanic...) 

[Lorian]

If the tacho increases but the revs don't really And it didn't change down then its probably a sensor or  dial fault.

Sent via swype & tapatalk on Android

[Duke750]

Took car to dealer today. Replicated and identified issue as problems changing between 2nd and 3rd gears. Scan log sent to Hyundai Aust for analysis. Waiting for response.

[Shambles]

Thanks for the update - it'll be interesting to see how this pans out....

[agentr31]

I assume that this is covered under warranty.

No, the engine speed did not change. My initial response was "bands". Do they still have "bands" in auto transmissions?

not sure mate... i thought they had "clutch packs" although what i think is a "clutch" is called a "drive plate" by nissan in the manual for my maxima...

who knows there are literally a thousand pieces in an auto...

[2i30s]

I assume that this is covered under warranty.

No, the engine speed did not change. My initial response was "bands". Do they still have "bands" in auto transmissions?

not sure mate... i thought they had "clutch packs" although what i think is a "clutch" is called a "drive plate" by nissan in the manual for my maxima...

who knows there are literally a thousand pieces in an auto...

and they are computerised also.

[Duke750]

I have been advised that Hyundai Aust wants my dealer to check the vacuum in my automatic transmission. Will keep you posted on what this means and what the outcome is.

[Dazzler]

I have been advised that Hyundai Aust wants my dealer to check the vacuum in my automatic transmission. Will keep you posted on what this means and what the outcome is.

Hope they get it sorted soon.. If you get a choice ask for a Dyson..

[LuciferDarklord]

Not sure about this particular model, but most still have bands - although they are self adjusting.  Most of the inside of the trans hasnt changed since the '50s except they are controlled by computers instead of complicated hydraulics.  Traditional autos decided when to change by a shift in balance between 'throttle pressure' and 'governor pressure'.  Throttle pressure is derived directly from a sliding valve attached to the throttle via cable (or a vacuum modulator in some others). Governor pressure is related to the vehicles speed and is derived from a governor valve spinning on the output shaft with a flyweight on it.  Light throttle, low throttle pressure, governor pressure overcomes throttle pressure early and forces the shift valves to flip over early.  Opposite happens when you hold your foot flat.  Now its just solenoids controlling when the trans shifts.

http://auto.howstuffworks.com/automatic-transmission10.htm

[Duke750]

Thanks for the explanation.

Hyundai Aust have advised my dealer to replace the gearbox. Waiting for it to arrive.

[eye30]

Hyundai Aust have advised my dealer to replace the gearbox. Waiting for it to arrive.

Probably cheaper to replace than to strip down

[Myowni30]

Wonder why the 6 Speed Auto is not used in the i30 yet.

See here December 2008 news (opens in a new window).

[Dazzler]

It is all cost versus benefit (to sales that is)

Over here the i30 is selling well enough they haven't even given us the 6 speed manual