hj75 2h excessive fuel consumption

[wombat_831]

my hj75 seems to use quite a bit of fuel once i get out on the open road and struggles to sit on 100k i rebuilt the motor 13000 km ago nov 2005 and have striped and checked the gearbox about 18 months ago i use diesel cond and run a AiT turbo at 9lb boost i have a 2 1\4" exhaust running straight out (no muffler either) just before the rear wheel and my exhaust temp taken at the manifold before the turbo runs about 500-600 degrees at 90 -100k i also have a landcruiser snorkel and with the price of fuel nearly $2 a litre here i cant afford to go have some offroad fun or get out shooting :truck:

[Dave_STR]

It sounds like its running rich, to rich. The exhaust temps are pretty high aswell.

Have you have it dyno tuned. If not get it done asap, other wise you will end up with some melted piston's.

Dave.

Edit

You exhaust sounds a little to small to for a turbo application, I would be running 2 and 3/4 inch system at the smallest. Go a 3 inch system aswell.

Not cheap I know but it will get the old 2H running at its optimum.

Mate good luck and keep us informed, not a Toyota man but have always appreciated the old 2H and the 12HT, have heard of one running on 3 cylinders with 3 cylinders either cracked or in the sump and still running.

[wombat_831]

i had the fuel pump looked at about 2 yrs ago by Australian diesel fuel injection services and they supposedly tuned it up and that was just after i fitted the pyro meter because i had replaced 2 heads both cracked and pre combustion chambers cracked as well confirming that it may have been running to ritch then mabe ill just pull out the manual and look at the fuel pump myself as there is no 4x4 dyno here in town that i know of im already looking at a 3" system but its just trying to convince the handbrake i can do it all myself in the workshop at work its just the stacks that will be the problem

[bigluxs84]

i would think the zorst is too small for a start i have just put a turbo on my 2H and had it dyno on my 35's and have not had a prob yet with it

my set-up is a T3/T4 turbo with a 3" zorst from turbo back no mufflers and the crossover pipe is a bit of 2" pipe then straight in to a 2 1/2 pipe

http://www.youtube.com/watch?v=wemBhpNm2d0 (http://www.youtube.com/watch?v=wemBhpNm2d0)

http://i67.photobucket.com/albums/h289/bigluxs/nat1-2.jpg

[wombat_831]

bigluxs84 are you running twin exhaust setup

[bigluxs84]

bigluxs84 are you running twin exhaust setup

nope just the one 3" to the back

[CHMS]

Change your air and fuel filters if they haven't been done recently, check all the valve clearances, and get the pump timing and fuel adjustment checked out. Like the others said, i would also go a 3" exhaust.

[wombat_831]

its always been the same on fuel its just starting to hurt more a mate and i did all the valve clearances about 12-18 months ago when i replaced the last head im seriously thinking about a water to air inter cooler too i was going to get the guys at work to build it the inlet on the manifold is 65mm so as long as i keep the 'open' area in the cooler at about the same or larger it should be ok am i right as i have access to 19mm od 12.5 id and some 20od 17id aluminum tube so i was going to cut them to length cut 2 end plates drill holes in the plates to run the tubes through enclose it so the water runs round the tubes and then reduce the ends to run air through the tubes between the turbo and inlet manifold or am i using tubing thats too big and wont pass enough air over the surface area of the tubes

[502chev]

It sounds like its running rich, to rich. The exhaust temps are pretty high aswell.

Have you have it dyno tuned. If not get it done asap, other wise you will end up with some melted piston's.

Dave.

I agree. Take it and have it dyno tuned immediately !!!! Alot of people only worry about "booooost" pressure and never about exhaust temp. Exhaust temp is very critical when it comes to how long an engine will last.

[wombat_831]

i noticed today when sitting on 70ks at 2000 rpm the pyrometer was sitting on about 360 degrees i usualy keep an eye on the exhaust temp and change the sensor between the front and rear bank every now and then as well especially after replacing two heads but these blokes at australian fuel injection seem to think its ok im just trying to figure out how to rebuild my spare injector pump and test it at the right revs the toyota manual makes it look realy hard but i reckon ive got enough mechanical knowledge to do it ill catch up with the diesel mechanical lecturer in my next tech school block and mabe he can help me as i know he is a drinker im sure it will be easy to negotiate a fair deal. i just wish we had a 4x4 dyno in kalgoorlie it also needs the extra setup for the snorkel or it will not be right either

[beast2h]

check the fuel/water seperator remove it clean and refit. 3inch pipe will help.... you need a proper pump tester it build an injector pump properly.
check the injector pump timing. if it is set at standed it can probley be advanced just a little to suit the turbo and fuel.

[wombat_831]

just filled up and put in 37.74L and done 210 km works out to 17.97 L per 100km thats round town but its when i get out on the highway that the fuel just disapears

[beast2h]

so have you checked or changed anything yet??

[DesertCruiser]

Wombat 831, I've got a HZJ75 with a turbo, out on the highway I use 20L per 100Km. and my temp just needs a warm to hot day to go up.that sucks, used to get 600km out of 80L, I worked it out...the bad fuel consumption. It was, Roof rack, Bull Bar with 12,000lb Winch and side rails, rear draw compartments full of drag chains and recovery gear, 2 wacoe friges, high lift jack and so. A lot of extra weight, cost me 200km in fuel. You know, I removed: the Heavy Duty Roof Rack (112Kg)and (Wind Drag) Emptied the rear draws (96Kg) The twin Rear wheel carrier and wheels(87Kg) Emptied the 100L water tank (say100Kg) and removed my atop bull bar Lightforce XGT's (wind drag). In all, I removed over 500Kg of weight and a few high wind Drag Factors. I went back up to 550K's gained 150Km per tank. and my temp went down, even on hot days!
I spent big $$$ trying to find out my overheating problems, Dyno's, Injector pump timing checked( It was a little out), new injectors, new radiator, fan and water pump and on and on.
It was all the extra shit I put on the poor old girl.
Well, I like all the extras! so I'll just have to be carefull!

[wombat_831]

na haven't had a chance to change or look at anything yet im still saving for my 3" exhaust ive got a 9 month old daughter so were just making do at the moment until i finish my trade in 12 months any hoo desert criuser ive only got the 2h not the 1hz motor not quite as good on power and economy as yours but there is a bit of extra shit on mine too as ive got about 60l water rollbar with 2 spares ontop that sit just under roof level 4 lightforce 240s above the roof as well as mud flaps that im about to take off as they mess my angles up and theyve been riped off out bush a few times but it puzzles me cos on the highway its always been the same before i put all the extra stuff on

[HJ75]

Had the same prob used fuel,got hotand no power.I had done the valves 12 mths before and decided to do them again anyway and shore enough most exhaust valves were out.temps down,economy up and power back.This is on an 87 2H 330000 ks

[wombat_831]

im also wondering if because i have a 2h with an aftermarket turbo and not the 12ht that my fuel pump is not set up properly to run a turbo as the governor vacuum lines once i start boosting then come under 9-10 psi of pressure instead of the vacuum it should be under

hjz5 do you mean valve clearances or replaced the valves

[beast2h]

mines has the vacuum control governer 11psi dosent affect it!

[wombat_831]

just did my 3" exhaust today and i filled up yesterday and put in about 17L for the last 100k round town so itl be interesting to see what i put in next week its a good thing my trade school lecturer had stuff all for us to do today as i machined up the adapter for the AiT turbo the waste gate tube was the hardest thing to get right unfortunately she is only a dump pipe at the moment as ive got to save another $90 to get the other 3 bends done luckily i picked up a pre bent 90 degree mandrel beng for $15 yesterday there worth $65 but the guy had it as old stock on the shelf i couldnt get the money out quick enough

[beast2h]

kool looking good

[HJ75]

Adjusted the valve clearance.Fuel has gone from 420k,s to 500 a tank.

[goldiexxxx]

hell, Im really surprised by some of the figures you boys are quoting for your fuel consumption. My 2H troopy got an average of 12.3km per 100km on a recent trip from Townsville to Cape York and back. Thats about 670km per tank. Im running a 2H with two Hiclones, K&N air filter, extractors, and 2.5 inch exhaust. The car was fairly loaded with camping gear, fridge, tools etc, but i totally agree, i too have rid the old girl of the roof rack, that was a significant saving if fuel consumption and increase in range.
Ive had this vehicle for 12 years now and ive got plenty of detailed figures of her fuel consumption. Im no expert, but here are my tips on how to reduce your fuel usage on a 2H. (listed in order by most significant)
1. extractors and larger exhaust
2. get rid of any unnecessary weight or wind drag
3. Hiclones (ill speak more about my thoughts after)
4. Valve clearances (readjust every year)
5. High flow air filters
6. Anything else that keeps your engine temp down (clean radiator etc)

Hiclones: I know a lot of people who rubbish them, saying they dont make any improvement in either power or fuel consumption, but again, Im no expert, but here is a theory. Most people are installing Hiclones on modern common rail diesel engines or computer controlled injected petrols. Maybe these engines are already running close to their optimum performance, therefore Hiclones will make little difference. Maybe older style engines that can do with any improvements are able to respond to any help they get from increased air volume in the pots. I dont have dyno print outs, but i do have detailed fuel usage figures for my veh. I can confirm that i got a 17% improvement in fuel consumption after installing the two hiclones. The power increase with just noticeable.
Anyway, there is a couple of ideas that i would be interested in responses from the more cluey of the members. Like i said, im no expert, so dont shoot me down too fast.
Cheers, Goldie

[beast2h]

geee you are getting insane fuel economy!!!

[wombat_831]

after my three inch exhaust i did 200 km and put in 33.37L so thats about 3L per 100 better im going to play with the fuel screw next and check the exhaust temps with the pyro to make sure it doesnt get too hot

[THE RIG]

i get shithouse fuel consumption with my 2H too,ive got extractors,2.5'' exhaust exiting just behind the cab and just had a fresh tune up with new injectors,i havent got any figures,but im saying they wouldnt be too good,but ive got big bullbar,big lights,roof light,double side rails and bigger rubber, mud flaps and all the gear which wouldnt help either



tom

[mickyd]

Been a few years since i had my hj47 and hj75 cruisers. The 47 was standard 2H and i used to get about 600km's a tank (sometimes 650km if a lot of highway driving) The 75 series had the 2H with aftermarket turbo and i was getting around the 1000km mark for 120lt's. That was with rear drawers and bullbar with high mount winch.