[Gannu_1]

A sticker on the Innova Crysta indicates 71.


Source: IAB

Try scanning the small QR code next to the number using a smartphone. Perhaps, that will indicate something.

[Sheel]

Don't know bro, but I would be wary using 4H. 4H is different from a full time or on demand 4X4, how, I do not know but in full time 4WD, there is no heaviness, but once you engage 4H, the SUV becomes a bit heavy.

I will leave the 4H mode for speeds >20 kmph and more so on slush/mud etc.

[Sankar]

Originally Posted by karan561

Sheel & Sankar,

Yes, the new Fortuner is not a full time 4WD (but RWD in regular 2H mode).
Also it doent have a centre diff.
There is not a restriction of it to be not to be used on high speeds on slippery surfaces like the way i used.
The previous gen Fortuner was full time 4wd having a centre diff but it remained OPEN in normal i.e. H Mode (normal tarmac driving) & only in HL Mode the centre diff was locked. The new gen Fortuner which is without a centre diff & in 4H Mode acts as a old gens 'H Mode'. Also relate it another way if they have given a system which is shift on the fly & they are giving instructions such as dont change above 100 km/h then such speeds are not possible in 'Off Road' situations. Hence its pretty much usable for high speeds on a wet day if you want. Also have had interactions / arguments with some Toyota guys and also some senior sales training people who had gone for pre-launch training and they too have used 4H at redline speeds in 5th & 6th gears.
Plus i did research on some other forums like FJ Cruiser forum (which uses similar shift on the fly system) there members are using the 4H mode at highway speeds too without any issue.

Hi Karan,

Toyota owners manual of the new Fortuner instructs the user to use 2H for hard surfaces and 4H only on unpaved surfaces and on icy/snow covered roads.

The book also warns the user about driving extensively in 4H on paved surfaces. A warning message is shown on the MID about high differential temperature and asking the user to shift to 2H.

I wonder why the toyota guys did not get the error when redlining it in 4H. Maybe they ignored it?

Because the new one does not have a center differential the 4H in new one does not act like 4H of the old one. The new one's 4H acts like old generations 4H with a locked center differential (if there is an option to lock the center differential of the old one).

[starter]

Originally Posted by karan561

The new gen Fortuner which is without a centre diff & in 4H Mode acts as a old gens 'H Mode'.

Is that a typo in the above statement Karan?
I think 4H in new fortuner is like HL Mode in the old fortuner. Not H Mode.

[karan561]

Originally Posted by Gannu_1

A sticker on the Innova Crysta indicates 71.

Try scanning the small QR code next to the number using a smartphone. Perhaps, that will indicate something.

Thanks Gannu for this tip

Originally Posted by starter

Is that a typo in the above statement Karan?
I think 4H in new fortuner is like HL Mode in the old fortuner. Not H Mode

Hi, There is NO typo there. There is no HL mode in new Fortuner just a 4H & 4L. Relate this to the modes of the Old gen Fortuner;

http://www.team-bhp.com/forum/test-d...ml#post1467341

^ So the relation with an centre diff unlocked of Old Fortuner in regular H mode should correspond to 4H mode of New Fortuner (New Fortuner has no centre diff at all = centre diff open of old Fortuner.)

Originally Posted by Sheel

Don't know bro, but I would be wary using 4H. 4H is different from a full time or on demand 4X4, how, I do not know but in full time 4WD, there is no heaviness, but once you engage 4H, the SUV becomes a bit heavy.

Originally Posted by Sankar

Hi Karan,
Toyota owners manual of the new Fortuner instructs the user to use 2H for hard surfaces and 4H only on unpaved surfaces and on icy/snow covered roads.
The book also warns the user about driving extensively in 4H on paved surfaces. A warning message is shown on the MID about high differential temperature and asking the user to shift to 2H.
I wonder why the toyota guys did not get the error when redlining it in 4H. Maybe they ignored it?
Because the new one does not have a center differential the 4H in new one does not act like 4H of the old one. The new one's 4H acts like old generations 4H with a locked center differential (if there is an option to lock the center differential of the old one).

Hey Sheel & Sankar,

Thanks for your valuable inputs.

Check out these 2 snap shots from the Users Manual;



^ Its clearly mentioned H2 & H4 are for "High Speed".

However its said to use H4 on off road, icy roads etc.



^ Just see how the emphasis on the word " Dry "

So Yes, User manual says do not use H4 or L4 in 'Dry' hard road/tarmac conditions due to high grip levels which will damage gear and drive train components.

But H4 just engages 4WD & a 50/50 torque split between front and rear axles and does not go into low range at all.
However i used it in very heavy rain when roads do become slippery & I believe H4 could be utilised as the wet slippery roads do allow the required slip to occur in the 4wd system (H4 Mode). Also this would provide a safer driving experience in these circumstances.

Overall this was done by me only on an 'experimental' basis on a very wet day. But i am obviously aware about the seriousness of this switchgear & would not try on a dry patch at high speeds.

[starter]

Originally Posted by karan561

There is no HL mode in new Fortuner just a 4H & 4L.

The 4H in the new fortuner is like HL mode of the old fortuner.
The 4L in the fortuner is like LL mode of the old fortuner.
Unfortunately, there is no H mode of the old fortuner in the new one.

[karan561]

Originally Posted by starter

The 4H in the new fortuner is like HL mode of the old fortuner.
The 4L in the fortuner is like LL mode of the old fortuner.
Unfortunately, there is no H mode of the old fortuner in the new one.

Old Fortuner when shifting from H Mode to HL mode, the Centre diff got locked (while it remained open in normal H mode), New Fortuner has no Centre Diff at all so how will it be locked in H4 mode and act as HL of old Fortuner ?

[Sheel]

You know Karan, I too felt the same when I was on those crappy HT tires, but a switch to AT did solve this issue for good.

Any new all terrain available in 265/60 R18 apart from Yokohama?

[starter]

Originally Posted by karan561

Old Fortuner when shifting from H Mode to HL mode, the Centre diff got locked (while it remained open in normal H mode), New Fortuner has no Centre Diff at all so how will it be locked in H4 mode and act as HL of old Fortuner ?

Sorry Karan if this is OT
My understanding is that in the old fortuner, when the center diff is unlocked (in H mode), the torque split is rear biased but there is no chance of a transmission wind-up due to the center diff.
When the center diff is locked (in HL mode), the torque split would be 50:50 front and rear with no reduction in gearing.
That is exactly what is happening in the 4H mode in the new fortuner. Since the new fortuner has no center diff, it is in two wheel drive until you shift it to 4H. Once in 4H, because it has no center diff, you are advised to not use it on dry surfaces because it needs the surface to provide some slip. Else, you might cause transmission wind-up.
Do you agree?

[karan561]

Originally Posted by Sheel

You know Karan, I too felt the same when I was on those crappy HT tires, but a switch to AT did solve this issue for good.

Any new all terrain available in 265/60 R18 apart from Yokohama?

Not yet, but i hear Continental is working on the Cross Contact AT pattern for 18" (should be coming in the next 2-3 months)

Originally Posted by starter

Sorry Karan if this is OT

Not at all man

My understanding is that in the old fortuner, when the center diff is unlocked (in H mode), the torque split is rear biased but there is no chance of a transmission wind-up due to the center diff.

Old Fortuner is a permanent 4WD (not rear biased) and only with the help of torsen (torque sensing) limited slip centre diff that during slip it sends the torque to the axle with more grip in order to maintain healthy motion.

Once in 4H, because it has no center diff, you are advised to not use it on dry surfaces because it needs the surface to provide some slip. Else, you might cause transmission wind-up.
Do you agree?

I know & where did i use it on a dry surface ? As i stated earlier this was done on experimental basis on an extremely wet day when roads were slippery & I believe H4 could be utilised as the wet slippery roads do allow the required slip to occur in the 4wd system (H4 Mode).

[human_wheels]

Originally Posted by karan561

Likes;

- The Hill Hold assist can get irritating for someone who knows how to release the clutch on the slope and doesn't need this assistance. I say this because you cannot switch off this assistance.

So true. I hate this feature in my Duster AWD. But agree that its a useful feature for many.

[Sankar]

Originally Posted by karan561

Hey Sheel & Sankar,

Thanks for your valuable inputs.

Check out these 2 snap shots from the Users Manual;

Attachment 1670360

^ Its clearly mentioned H2 & H4 are for "High Speed".

However its said to use H4 on off road, icy roads etc.

Attachment 1670364

^ Just see how the emphasis on the word " Dry "

So Yes, User manual says do not use H4 or L4

Hi Karan, if the tyres are good and if there's no standing water a wet road may not allow the wheels to slip and slide like a snow or ice covered road. There's a oil temp sensor in the front differential and if it gets too hot you will get a warning on the dash.

The manual also does not say that you can use it on wet roads or wet paved surfaces. All it says is don't use it on paved surfaces or expressways. It says only to use it on tracks that allow the wheel to slide.

This is from the workshop manual of the new fortuner.

[karan561]

Originally Posted by Sankar

Hi Karan, if the tyres are good and if there's no standing water a wet road may not allow the wheels to slip and slide like a snow or ice covered road. There's a oil temp sensor in the front differential and if it gets too hot you will get a warning on the dash.

Hey Sankar,

I know the manual what you are saying is all said before in post #95 & i have already made the point there that you shouldt drive on 'dry' paved roads / expressways in H4 + OE tyres are bad performers in Rain so that point about having good tyres is out of question.
Also when people are driving on ice covered roads those are icy patches and cars can do 100+ easily on those highways. So drivers dont switch ON H4 when they see an icy patch and then turn it off after its passed, they always keep it on. So Relax. I understand your concern towards a fellow BHPians car's health & you too respect my decision & logic behind a experimental analysis of H4 mode on a extremely wet day & in a downpour.

All it says is don't use it on paved surfaces or expressways. It says only to use it on tracks that allow the wheel to slide.

See again Why havent you mentioned the word 'dry' before paved surfaces which they have clearly mentioned.

But overall thanks for your input as enough has been discussed on this now & with all due respect towards your point of view, it was a fun talk but lets not carry forward this discussion further.

[Sankar]

Originally Posted by karan561

See again Why havent you mentioned the word 'dry' before paved surfaces which they have clearly mentioned.

But overall thanks for your input as enough has been discussed on this now & with all due respect towards your point of view, it was a fun talk but lets not carry forward this discussion further.

Because paved wet road (expressway in this case) doesn't allow the wheels to slide. If it did then all other regular 2WDs would be losing control on that stretch.

Signing off from this topic

[karan561]

Originally Posted by human_wheels

So true. I hate this feature in my Duster AWD. But agree that its a useful feature for many.

Hey, good to know that you found the hill hold assist irritating as well.

But honestly over time i have gotten used to it & sometimes i actually wait for this to kick in on a up-slope