Outer Limits 4x4 Board

Just wondering if people could post up some figures regarding fuel consumption of the 4.2L (Six Cylinder) Diesel Engine (in any model toyota).

If you have oversize tyres fitted, could you please include the difference you found when going bigger and what size tyres you are currently running.

How would a 1HZ Troopie cope with 35"s and what would be an estimated fuel consumption?

Regards,

Nick

Had a 1hz in a 75 series ute. Non turbo.
fuel consumption is shithouse when on the road with 35's but still good compared to petrol.
Mine was high and pretty wide a lot of the time (spacers) and I really noticed a difference in consumption when going from 33's to 35's.

Power suffered considerably too but not to the point that you would be holding up traffic or anything. Still very good offroad due to low down torque and gearing of the deisel.
I had extractors and straight thru muffler and k&n filter etc which seemed to help a lot too.

Good luck. Definitely worth having 35's or bigger and sacrificing some speed on road even if you do chew a bit more juice.

BTW I got anywhere from 350 to 450 km per 65l of fuel depending on what driving etc.
Before all the mods I think I got up to 600 km per 65/70litres

I got a 1HZ 80 series, with 35" BFG Muds. Average is about 13L/100km. Its a friggin heavy thing too mind you

Phill

Thanks so far! These are exactly the sort of comments that I am after!

Cheers,
Nick

i got 900km outta both tanks, 90 & 50 i think from mem.
that was flat out at 120kmh with 35's. and a turbo

With stockers on mine and no lift - 1300 per tanks

Now with 5" lift and 35's - lucky to get 800 from 140L.

Do have exhaust and pump tickled for more fuel = more fun in bush.

Now thinking turbo will bring eceonomy back (unless i'm boooooooooosstting everywhere - which - I think I will be....)

Either Turbo or diff gears once you run 35's would be necessary - or extratcors and good dyno tune...

80diesel4play wrote:With stockers on mine and no lift - 1300 per tanks

Now with 5" lift and 35's - lucky to get 800 from 140L.

Do have exhaust and pump tickled for more fuel = more fun in bush.

Now thinking turbo will bring eceonomy back (unless i'm boooooooooosstting everywhere - which - I think I will be....)

Either Turbo or diff gears once you run 35's would be necessary - or extratcors and good dyno tune...

trust me the turbo does not make the much diff in fuel econ! either do diff gears! i have had both, the diff gears went south as the rev way to high for freeway work, but kept the turbo as it does give it a bit more omph..

hrm I have found the turbo to make a fair difference in economy - better around town but worse on the freeway, probably because you CAN do everything at 120 you do. in the 80 I get about 11 litres/100km with 5" lift and stocker wheels (yes it looks gay) town and 12 - 13 litres/100km highway depending on how hard it is pushed, if you go very soft on it and keep it around 100km/h it is spectacular, 10.5l/100km but it is hard to be disciplined to keep it that slow all the time. on the other hand it will go 10 all day without raising a sweat so the turbo is worth the $.

injection timing, injector condition, valve timing (timing belt condition), oil selection (5W30 recommended for later models!) and oil condition (religious 5000km change interval) make differences to fuel economy. overfuelling for extra power is not a good idea on any indirect injected diesel, it makes the EGT's go unacceptably high, and can burn exhaust valves, crack precombustion chambers (which can fall apart and cause really catastrophic damage), soots up the oil too quickly, and causes the engine to wear unacceptably quickly.

if you can afford it, go for a 1HD-T or 1HD-FT, they are direct injected and have reliable 200kW+ potential with bigger turbo, intercooling and tuning, without internal modification. 140 - 150kW is the best you can reliably expect from an internally standard 1HZ, the indirect injection makes the motor less and less efficient as the boost goes up to the point where stuffing more air in just causes the engine to get hotter without valuable power gains - around 10 - 12psi boost.