Gearbox "slipping" when changing down to 2nd gear

[Kalle]

I took the Leggie out for a small track day and experienced some problems..

I used the tiptronic mode and found out that when changing down from 3rd gear to second gear it doesn't seem to lock in properly... when you hit the launch pedal it seems to slip more than I would expect (up to the red marks)
Almost like it was revved in neutral.

The cicumstances where that I braked heavily just before and then changed the gear and then did a sharp turn. The gaspedal was not touched during the braking and gearchanging and in the beginning of the turning.

I've read that it could be due to bad ATF!? Mine was changed a year ago by the previous owner so it shouldn' be too bad.. right? It looks ok atleast.

It is no problem changing gears up

What could be the problem?

[Kieran]

IT could be bad ATF, or just the wrong type in the gearbox. If you were on track, it could also be that the fluid was overheating. Could just be normal behaviour - difficult to say!

[bradc]

I would suggest that you try driving it normally on a road and trying a similar thing, and seeing if it happens. That will tell you if it was something to do with the temps of the transmission on that day. I would suggest you try changing the ATF as well if it happens in normal driving, it doesn't quite sound right to me.

[richy rich]

as said above get the atf flushed and changed for some good stuff amsoil is the best imo.
you can also consider these boxes do not like changing down to second gear try driving in D and see if it will change down to second it will not do it.

[amsoil]

The chances are that you have Dextron III in your box which is not the correct fluid for the Triptronic. THe fluid may be OK for normal use in a normal auto box but in a triptronic box it doesn't change gear quite as it should and it degradates with high temperature. From what you are saying I would guess that the fluid is overheating and breaking down, the slipping will wear the triptronic clutches in a disasterous manner if you don't do something. Sorry for the plug but:- http://www.performanceoilsltd.co.uk/...ion_fluid.html

If you look at the bottom you will see the difference in operating temperature between Amsoil synthetic ATF and mineral ATF. Amsoil ATF wont break down with temperature in the same way will last much longer than mineral ATF and being of the correct spec for the Mitzy triptronic will make the box and your driving much smoother. There is also advantage in resetting the Triptronic ECU when you change fluids, the gear changes are that different.
The time o change the fluid to the correct grade was really yesterday; Mitzy own fluid is the correct grade but I dont know if it will take the heat soak of a track day, I somehow doubt it really.
Yes I will ship if you have no one to take it over for you. If Mitzu Sweden might want more just PM me.

[richy rich]

you doing a double plug a don

[amsoil]

Don't really think I need to give a plug just concerned Kalle could loose his box.

[Kalle]

Ok, I'll change my ATF for amsoil and see what happens!

Found a retailer in Sweden, but there are two alternatives:
GEAR LUBE 75W-90 (AGR)
or
GEAR LUBE 85W-140 (AGO)

Which one do I go for?

[Nick Mann]

They look like gear oils? Can anybody say for sure? Might be good for the transfer box, but not the gearbox.

You need ATF. Dexron III is the closest readily available ATF, but for all the reasons listed in post 5 of this thread, I woul strongly suggest you find an Amsoil dealer.

[Kalle]

They are Amsoil transmission oil.. see their webpage:
http://www.normax.net/html/amsoil_oljor.html

Specifiacations on the two alternatives, most in Swedish, but some text in english and also a picture on the package

http://www.normax.net/09-105_swe.pdf
http://www.normax.net/09-121_swe.pdf

[Nick Mann]

I think that they are gear oils, though. Would probably be good in manual transmissions. But I think ATF has hydraulic properties as well as lubrication.

But I am not an expert! Someone who has more knowledge than me needs to confirm. (More knowledge than me on oils is not difficult!!)

[Roadrunner]

I think it's probably simpler than this. I'd suspect the ATF level is low. Warn the car up, stop on level ground, move the lever through from P to D and back, stopping at each click to ensure the ATF gets round the box, then check the level with the engine running. These boxes are very sensitive to having the correct ATF level and your symptom suggests the level is low.

[Physician]

One thing for certain ......... it is NOT acting properly. I've done a few track days and use EXACTLY the same procedure when changing down gears. I don't have any issues you detail.

As my oils will also be at high temperatures I would suggest that H7 may well be correct about oil levels ....... OR, the incorrect fluid has been put in the box.

[psbarham]

yup nicks right they are gear oil , fine in a manual box , you can put it in your auto if you want , it will save you a fortune in petrol and tyres coz it wont do bugger all in the forward motion department

[Kieran]

Found a retailer in Sweden, but there are two alternatives:
GEAR LUBE 75W-90 (AGR)
or
GEAR LUBE 85W-140 (AGO)

Which one do I go for?

Don't got for those Kalle! They're gear oils... the AGR is okay for your rear diff and transfer box, but not for your gearbox, which needs Automatic Transmission fluid. The Stuff you need is this:

http://www.performanceoilsltd.co.uk/...ion_fluid.html

[Kalle]

Have checked doing the same procedure when the vehicle has just heated up and there's no problem at all... However it changes gears a little strange on third gear when cold, but I assume that is normal?

Another related question
When using the tiptronic mode for driving fast you should keep the gas pedal down completely when changing gears, right? Is it normal that the engine revs up another 500rpm when changing and then it goes back to the normal rpm for the new gear? At what rpm do you guys change gears up? 6500?

[bradc]

I sometimes lift off between tiptronic changes, if you do it just right it sounds like a manual Most of the time I don't change the position of the throttle at all through the upchange.

If I'm trying to go fast then I'll change up anywhere between 6000 and 6500

[Kalle]

I have now phoned the mitsubishi center that serviced my car last year when they replaced cambelt, tensioner and autobox oil. It appears that it was no standard service, just a request from the owner M Jones. So the pulleys, waterpump, spark plugs, etc was not changed as would have been normal to do for the big service..

They claim they have changed the autobox oil to Mitsubishis own "Dire queen" oil?? Did I heard right? Is it really called "dire queen"?? Does anyone know what oil Mitsubishi uses for the tiptronic box?

[Roadrunner]

They claim they have changed the autobox oil to Mitsubishis own "Dire queen" oil?? Did I heard right? Is it really called "dire queen"?? Does anyone know what oil Mitsubishi uses for the tiptronic box?

Mitsubishi recommend their own brand DiaQueen SP-III ATF and you shouldn't have any problems using that. Your symptoms still suggest the fluid level is low - engine revving +500 between changes is symptomatic of that too. It should be easily checked ...

[Kalle]

It was a little hard to see on the dipstick but I think my levels were just fine...
Could this mean I have some mechanical problems inside the gearbox?