VDJ79 Dual cab help

Submitted: Monday, Sep 09, 2013 at 00:02
ThreadID: 104249 Views:6040 Replies:6 FollowUps:11
This Thread has been Archived
Hi all, I am about to order my new dual cab 79, the only thing I dont like is the gearing. Has anybody fitted taller diff gears. Tyre size will be 285/75, this will not compensate enough, I would like to drop the revs by 200 - 300 rpm in top gear.

Cheers
Back Expand Un-Read 0 Moderator

Reply By: AlbyNSW - Monday, Sep 09, 2013 at 06:35

Monday, Sep 09, 2013 at 06:35
I have one and are running that tyre size and the gearing is fine. I was initially concerned like you but have found it a non issue, the RPM is consistent with a Hilux manual.
Interesting to note there is a fuel consumption thread on LCOOL and it was reported that fuel consumption between 4th and 5th is the same.
AnswerID: 517851

Reply By: hotfishez - Monday, Sep 09, 2013 at 07:18

Monday, Sep 09, 2013 at 07:18
Fuel consumption is another thing to look at, I have not seen or heard of a vdj getting anything under 15 opposed to the advertised 11.9. Any mods help in consumption?
AnswerID: 517853

Follow Up By: Member - Howard (ACT) - Monday, Sep 09, 2013 at 08:32

Monday, Sep 09, 2013 at 08:32
Hotfishez,
the only mod that will get you 11.9/100 is the lifting of the right foot.
I have got down to 12 on mine when I first got it
empty tray, running at max 100 km on freeway travel.
now with the canopy on back and always heavily loaded , running 285's it averages 15-15.5.
I try to limit revs to 2500 when cruising.
the vehicles have the aerodymanics of a brick on the highwayand thats where fuel use is worst.
surprisingly in a recent drive from Mungerannie to Poeppels corner via the Warburton /K1 it returned 7.9 km per litre(12.5/100) when loaded to Max but we were driving in fuel conservation mode.

cheers
Howard
Resigned to Retirement

Member
My Profile  Send Message

0
FollowupID: 797587

Follow Up By: AlbyNSW - Monday, Sep 09, 2013 at 08:40

Monday, Sep 09, 2013 at 08:40
My consumption figures are similar to Howard's and I run fully laden with a gullwing canopy
To give you a comparison the last trip I did of about 6000k I was averaging 10 to 15% more fuel use than a similarly configured dual cab diesel Hilux, this was a mixture of highway and offroad use, my vehicle would of been heavier than his.
0
FollowupID: 797588

Follow Up By: Member - VickiW - Monday, Sep 09, 2013 at 21:16

Monday, Sep 09, 2013 at 21:16
Hi, I have the wagon and average 12 - 13 without any real change when fully loaded for a trip (not towing).
My daily drive to work includes lots (lots) of heavy traffic too.
0
FollowupID: 797656

Follow Up By: Dennis Ellery - Tuesday, Sep 10, 2013 at 12:02

Tuesday, Sep 10, 2013 at 12:02
When new, my 2008 Troopy came with skinnies – on tests on bitumen, and a light foot on the pedal 11.9 was achievable.
When I changed over to the wider, lower pressure, 285/75 tyres fuel consumption rose noticeably.
Wouldn’t tow in 5th - tests, towing a 3 tonne caravan on bitumen showed there was no measurable difference in fuel consumption between 4th and 5th
0
FollowupID: 797674

Reply By: Member - Rosco from way back - Monday, Sep 09, 2013 at 08:31

Monday, Sep 09, 2013 at 08:31
I'm running the std 265/70 tyres with a single cab (no doubt the same gearing I would think). These are nowhere near as tall as you're proposing and gearing doesn't seem to be an issue. At around 100 kph, I'm only pulling about 2300 RPM which seems reasonable to me. From what I've read you need to keep under 2500 RPM if you're after economy.

As far as consumption goes I agree 11.9 is a bit of a fairy tale, however, on a recent trip, fully loaded and towing the Conqueror which would nudge 2 tonnes I managed 15.5 over flat/undulating open country at 90-100. If I gave it a bit more stick it quickly jumped to 22.5.

The thread mentioned on Lcool has some interesting results which are better than mine. I am hoping mine will improve with time when it loosens up a tad as I've only done 25K.

Personally I don't see it as an issue and I would add no doubt Mr Toyota would remove the entire drive train from his warranty if you played around with the gearing.
AnswerID: 517856

Reply By: Robin Miller - Monday, Sep 09, 2013 at 10:48

Monday, Sep 09, 2013 at 10:48
Think carefully about tyres and what you wish to achieve.

If I had that car a wouldn't let if off the showroom floor without spacers to align the rear track to the front and hence lower rolling resistance on some surfaces.

Remember all tyres of a nominal size are not the same diameter.

You will get lower rolling resistance and lower revs if you fit 255/85/16 which are taller than 285/75 by up to 1cm depending on brands.
Robin Miller

Member
My Profile  Send Message

AnswerID: 517863

Follow Up By: Member - Rosco from way back - Monday, Sep 09, 2013 at 11:19

Monday, Sep 09, 2013 at 11:19
Not sure Robin

But isn't there a legality/insurance/road worthiness issue with wheel spacers??

My understanding (limited thought it may be) is that they're fine as long as you don't use them on road.
0
FollowupID: 797599

Follow Up By: AlbyNSW - Monday, Sep 09, 2013 at 12:47

Monday, Sep 09, 2013 at 12:47
Wheel spacers are definately illegal for on road use
0
FollowupID: 797606

Follow Up By: Robin Miller - Monday, Sep 09, 2013 at 16:49

Monday, Sep 09, 2013 at 16:49
Marginally Illegal Rosco - but Hotfish has stated he wants 285/75/16 tyres which are probably illegal on that car.


(Degrees of illegally is an interesting concept - in practise you could probably win with properly done spacers as they make the car safer - as we still have some common law rights left).

Robin Miller

Member
My Profile  Send Message

0
FollowupID: 797629

Follow Up By: Mick O - Monday, Sep 09, 2013 at 17:08

Monday, Sep 09, 2013 at 17:08
As an aside to the spacer debate, I totally agree with Robin's sentiment in respect to widening the stance of the rear wheels to match the front.

I have used generic steel spacers with a drastic result. I then had custom 40mm spacers made from Billet aluminium from Galpro Engineering in Adelaide. The 40mm allowed at least 15mm of the axle hub to act as a spigot for the wheels. Being custom made, the tolerances and fit were a damn site better than the steel units. No problems with the aluminium but having lost a wheel, I was always nervous due to the conditions I subject the vehicle too on one of my trips.

Just before leaving on this year's expedition I had Multidrive Technologies in Geelong widen the rear diff housing and make me custom axles. They also laminated and strengthened the diff housing all the way to and around the diff pumpkin. Bloody magnificent job, the stances of both axles now match perfectly and it's fully engineered, certified and no insurance/rego hassles. The diff housing has also been strengthened as an added bonus. It kicks serious butt in the sand now!

Multidrive Technologies

Darryl is the bloke to talk to.

Cheers Mick

''We knew from the experience of well-known travelers that the
trip would doubtless be attended with much hardship.''
Richard Maurice - 1903

Lifetime Member
My Profile  My Blog  Send Message

0
FollowupID: 797635

Follow Up By: The Landy - Tuesday, Sep 10, 2013 at 12:13

Tuesday, Sep 10, 2013 at 12:13
Thanks for the info Mick, and I have ordered the Fuel Manager from Terrain Tamer...

Cheers...
0
FollowupID: 797676

Follow Up By: Dennis Ellery - Tuesday, Sep 10, 2013 at 12:56

Tuesday, Sep 10, 2013 at 12:56
Spacers or not - It’s a personal choice.
Having driven in groups of 4WDs, mainly in sand, I have never been at disadvantage by not having spacers. The main difference I have encountered is a person’s sand driving ability (excluding differences such as the engines torque at low revs, ground clearance, or its wheel diameter and width)
0
FollowupID: 797677

Reply By: 99problems - Monday, Sep 09, 2013 at 19:27

Monday, Sep 09, 2013 at 19:27
I consistently get between 11-12 in my 76 Wagon. With OME, 3 inch exhaust, 265/75/16 KM2's.

When I was looking at tyres, unless you can find a manufacturer who recommends fitting a 285/75 tyre to a 16x7 rim I wouldn't bother.
AnswerID: 517882

Follow Up By: Member - Hillel K (VIC) - Monday, Sep 09, 2013 at 19:59

Monday, Sep 09, 2013 at 19:59
Hi there I am interested to know how you have found the KM2's as i need to replace my tyres in the next month
Thanks
HK
0
FollowupID: 797651

Reply By: 99problems - Tuesday, Sep 10, 2013 at 17:30

Tuesday, Sep 10, 2013 at 17:30
Found them great, so far only on black stuff. No real noise, that's not saying much though, when comparing to wind noise.
AnswerID: 517932

Sponsored Links

Popular Products (13)