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 Post subject: Part time kits and fuel economy
PostPosted: Fri Oct 14, 2016 10:02 pm 
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Champion
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Joined: Sat Jan 24, 2015 9:42 pm
Posts: 63
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Location: ACT
Australian State: NSW
Cruiser Model: HDJ80 GXL
Transmission: Manual
Year: 91
Hi all

Anyone out there give some info on most
Time kits.

1. Fuel economy. Is it better?
2. Does it drive better?

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 Post subject: Re: Part time kits and fuel economy
PostPosted: Fri Oct 14, 2016 11:54 pm 
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80 Newbie
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Joined: Fri Jun 10, 2016 9:50 pm
Posts: 18
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Australian State: Not in Aus
Cruiser Model: HDJ81 VX Import
Transmission: Auto
Year: 94
What is in a part time kit? Just new front hubs?


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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sat Oct 15, 2016 6:47 am 
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Joined: Tue May 22, 2012 7:43 pm
Posts: 123
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Location: Brisbane North
Australian State: QLD
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 95
A few mates have done theirs with mixed results.
One guy didnt like it and removed it, the other likes it.
Fuel economy was slightly better but if you purchased the kits just for that its a lot of kms before you get your money back.

Carbon in the kit you get a new transfer diff, new hubs and a few other bits and pieces. You cant just swap the hubs over as the transfer (centre) diff is still spinning all other parts like front diff and cvs. I can imagine you wouldn't have any drive either as all the drive will be lost through the front free wheeling hubs.

Neil

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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sat Oct 15, 2016 7:05 am 
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Posts: 1747
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Location: Ingle Farm (Adelaide suburb) South Australia
Australian State: SA
Cruiser Model: FZJ80 GXL
Transmission: Auto
Year: 94
If you just put free wheeling hubs only, with centre diff lock off the power would take the line of least resistance and turn the front shaft and diff with no power to rear wheels. If you locked the centre diff the front and rear shafts would turn, driving the rear wheels but spinning the front diff. Front wheel drive cars tend to oversteer, rear wheelers tend to understeer, all wheel drives seem to be more neutral and go where you aim for. I think that, as a performance vehicle was the reason for all wheel drive (ie centre diff lock off in the 80's)
Mike


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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sat Oct 15, 2016 12:36 pm 
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Joined: Fri Feb 26, 2010 9:48 am
Posts: 1169
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Location: Brisbane
Australian State: QLD
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 93
Fuel economy is not a reason to fit a part time kit unless you are doing a BIG heap of driving. The difference is not huge and first you would have to offset the cost of the kit. I got one fitted as I had a big lift at the time and was getting front shaft vibs so the kit got rid of that on road. I personally like how it feels as a 2wd much better and I drive to the conditions so have never had a problem.

I elected to pay a few $ more and get the kit with the "heavy duty" hubs as I had heard a few 3rd hand stories about the hubs being the weak link and cracking.

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Mike O. - '93 GXL 80 Series. 1HZ + Garrett turbo, Safari Intercooler, 2" lift, XXi Adjustable caster plates, part-time kit, rear locker, custom drawers


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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sun Oct 16, 2016 10:38 am 
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Posts: 866
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Location: Sth. West. W.A.
Australian State: WA
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 93
When I bought my 80 it was almost 20 years old, so had wear in the driveline.
This backlash made it a real effort to get silent smooth gear changes, which annoyed the crap out of me.
I fitted the kit for that reason alone, and would do it again for that reason alone.
For me, the economy did not alter at all, but it is just so much better to drive now.
If the backlash doesn't annoy you, don't bother.
The only other gain to be had is the obvious, the front drive shaft, and the front axles only turn in 4WD, so if you are like me and mainly use it as a tug, it will take a lifetime to wear out front uni joints, front seal in the transfer, axle seals and hub bearings/sleeves, and CVs.
Hope that makes the decision easier :-)

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Cheers, PhillT :-) HZJ80, GXL, Manual, GTurbo, Part-time Kit.
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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sun Oct 16, 2016 11:28 am 
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Posts: 7194
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Location: Tom Price
Australian State: WA
Cruiser Model: I dont have an 80
Transmission: What did I just say?
Year: I dont have an 80 yet!!
One of my previous 2 80s was a standard so the factory part time transfer - the other was a GXL 40th anniversary so the viscous centre diff full time 4wd. Both had 1HZ engines and both manual. No real noticible difference between the two in regards to fuel ecomomy.
I much prefered the full time 4wd on gravel roads as opposed to the part time - it understeered a bit more but it wasnt as fazed by corrigations as much (didnt get all tail happy when driving straight when you hit some severe corrigations)

On the bitumen I didnt push either of them hard enough to pick a difference in the handling

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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sun Oct 16, 2016 3:35 pm 
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Champion
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Joined: Sat Jan 24, 2015 9:42 pm
Posts: 63
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Location: ACT
Australian State: NSW
Cruiser Model: HDJ80 GXL
Transmission: Manual
Year: 91
Cheers everyone.

Looking at doing it more
For the driving and less wear and tear on the drive line rather than fuel economy. I was just curious enough because the manufactures claim a decreas of like 10-15% on fuel saving.

Thanks all.

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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sun Oct 16, 2016 6:49 pm 
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Posts: 866
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Location: Sth. West. W.A.
Australian State: WA
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 93
CapsCruiser wrote:
manufactures claim a decrease of like 10-15% on fuel usage.



Pure fiction.

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Cheers, PhillT :-) HZJ80, GXL, Manual, GTurbo, Part-time Kit.
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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sun Oct 16, 2016 7:58 pm 
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Joined: Fri Feb 26, 2010 9:48 am
Posts: 1169
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Location: Brisbane
Australian State: QLD
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 93
Yep, what Phil said.

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Mike O. - '93 GXL 80 Series. 1HZ + Garrett turbo, Safari Intercooler, 2" lift, XXi Adjustable caster plates, part-time kit, rear locker, custom drawers


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 Post subject: Re: Part time kits and fuel economy
PostPosted: Sun Oct 16, 2016 8:52 pm 
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Joined: Sat Mar 21, 2009 8:59 am
Posts: 406
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Location: NSW Mid North Coast
Australian State: NSW
Cruiser Model: HZJ105 GXL
Transmission: Auto
Year: 98
Drop the front drive shaft and engage CDL for a week or two and see what that does for economy. Close enough to full kit apart from hubs. Tried this in my 80 and made no difference to fuel but made it drive very ugly.

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 Post subject: Re: Part time kits and fuel economy
PostPosted: Mon Oct 17, 2016 6:45 am 
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Posts: 1747
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Location: Ingle Farm (Adelaide suburb) South Australia
Australian State: SA
Cruiser Model: FZJ80 GXL
Transmission: Auto
Year: 94
One effect not mentioned, Aquaplaning. In a rear wheel drive vehicle on wet roads, hit the brakes, front wheels stop turning and start skating in the water - no steering. All wheel drive the wheels are driven, so no lock up aquaplaning. Being a cautious (prudent?) driver I haven't really put this to test.

Wear factor. I bought the 80 in 2002 with 217,00k and it now has 441,000k. Have not replaced either of the diffs, at one stage I had the CV joints replaced because they "Clicked" when turning (as in steering - not rotating) under power.

Mike


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 Post subject: Re: Part time kits and fuel economy
PostPosted: Mon Oct 17, 2016 8:37 am 
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Joined: Fri Feb 26, 2010 9:48 am
Posts: 1169
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Location: Brisbane
Australian State: QLD
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 93
mwitcher wrote:
One effect not mentioned, Aquaplaning. In a rear wheel drive vehicle on wet roads, hit the brakes, front wheels stop turning and start skating in the water - no steering. All wheel drive the wheels are driven, so no lock up aquaplaning. Being a cautious (prudent?) driver I haven't really put this to test.

Wear factor. I bought the 80 in 2002 with 217,00k and it now has 441,000k. Have not replaced either of the diffs, at one stage I had the CV joints replaced because they "Clicked" when turning (as in steering - not rotating) under power.

Mike


Sorry to be pedantic but rotating tyres can aquaplane however the contact speed required to do so is higher. From memory it is:

7.7 * square root(tyre pressure in PSI) for a stationary tyre

9 * square root(tyre pressure in PSI) for a rotating tyre

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 Post subject: Re: Part time kits and fuel economy
PostPosted: Mon Oct 17, 2016 11:06 am 
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Joined: Sat Jan 09, 2010 6:51 pm
Posts: 1747
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Location: Ingle Farm (Adelaide suburb) South Australia
Australian State: SA
Cruiser Model: FZJ80 GXL
Transmission: Auto
Year: 94
OK, AT 36PSI wet IS 46.2MPH or 73.9km/h, dry 54MPH or 86.4km/h. On bitumen roads in the wet, I watch for the two wet tracks where constant traffic has worn the roughness off the surface and the line markings and then drive in the drier areas where there is still texture to the surface. A practice I have followed for many years.
Mike


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 Post subject: Re: Part time kits and fuel economy
PostPosted: Mon Oct 17, 2016 11:11 am 
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Posts: 866
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Location: Sth. West. W.A.
Australian State: WA
Cruiser Model: HZJ80 GXL
Transmission: Manual
Year: 93
mwitcher wrote:
One effect not mentioned, Aquaplaning. In a rear wheel drive vehicle on wet roads, hit the brakes, front wheels stop turning and start skating in the water - no steering. All wheel drive the wheels are driven, so no lock up aquaplaning. Being a cautious (prudent?) driver
Mike

This conversation is getting a bit too sciency (new word ;-) ) for me to keep up with 100%, but would there not be a difference between the two constant system, with regard to aqua-planing, given that one is mechanical so no slip, the other is viscous, so slip involved?

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