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Thread: 1jz fuel economy

  1. #1
    Junior Member Domestic Engineer J0RD0's Avatar
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    Default 1jz fuel economy

    hi everyone, I have me a 1jzgte vvti engine + auto running a motec and 660cc injectors. At the moment everything else is stock (turbo/cams etc) and its also running what i think is stock boost 9psi. My problem is its getting on average about 230 - 280ks to a 45ltr tank which is pretty piss poor if you ask me, i did a run just putting it around which was very hard to do with an almost no lag and got around 320ks to a tank. I still have the standard 1jz injectors and im wondering if i re-fit the stockers and re-tune the engine will this give me a bit better fuel economy? Or will it just be a waste of time and money?

    Im also wondering what a standard 1jz soarer or supra gets to a tank on average just for comparison?
    RA23 1JZ VVTi 373hp - SOLD
    12.4 @ 110mph
    THE EVOROLLA 262.9hp - SOLD
    JZ parts facebook page - https://www.facebook.com/groups/524841910926804/

  2. #2
    Junior Member Backyard Mechanic
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    Default Re: 1jz fuel economy

    Who tuned the Motec ? Sounds to me like they didnt spend anytime tuning part/light throttle applications very well . Did you retain the AFM or go MAP tuning only ?
    11.72 @ 116.7mph = Quickest Stock Turbo Jzz30 series Soarer And 1st into the 11's WOOOT!!!

    Still going good
    http://www.youtube.com/watch?v=tc_7aRUGshw

  3. #3
    Junior Member Domestic Engineer J0RD0's Avatar
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    Default Re: 1jz fuel economy

    brisbane turbo and tuning, forgot to mention the tuned it without a tps and it is map sensored. The tuner also complained it was hard to tune with the auto/torque convertor at low revs. Sometimes on really light throttle its hesitates and drops revs, on the otherhand it is super fucking responsive and makes decent power. Eg i can be doing 60kph and in overdrive and give it slight throttle and it is on boost instantly
    RA23 1JZ VVTi 373hp - SOLD
    12.4 @ 110mph
    THE EVOROLLA 262.9hp - SOLD
    JZ parts facebook page - https://www.facebook.com/groups/524841910926804/

  4. #4
    Junior Member Domestic Engineer J0RD0's Avatar
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    Default Re: 1jz fuel economy

    Also ive changed the plugs about 5 times since ive had the car back and they dont seemed to be fouled up or anything.
    RA23 1JZ VVTi 373hp - SOLD
    12.4 @ 110mph
    THE EVOROLLA 262.9hp - SOLD
    JZ parts facebook page - https://www.facebook.com/groups/524841910926804/

  5. #5
    JZ Powered Too Much Toyota EldarO's Avatar
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    Default Re: 1jz fuel economy

    i was getting 400 odd k's out of 60 litres, so yours aint too shab i guess, with the smaller tank.
    mines 100% standard bar exhaust.

  6. #6
    Estranged Member Chief Engine Builder mullett's Avatar
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    Default Re: 1jz fuel economy

    Changing the injectors will make bugger all difference if it's been tuned right. Does your Motec have wide-band 02 capabilities? You need an ecu that can 'self tune' in light load situations (like a factory ECU does in closed loop mode) to get around the problem of the auto on the dyno. The other option is a 'lock up' torque converter, although I'm not sure that it would help enough, or to get the engine tuned on an engine (rather than chassis) dyno.

    Are you planning more mods? It seems to me that if you're going to leave the car at the level it's at now, you might as well go back to a standard ECU, it'll probably be much better on fuel.

    -RM.

  7. #7
    Junior Member Backyard Mechanic Hash_ra23's Avatar
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    Default Re: 1jz fuel economy

    easy fix:
    look under your rear guards...see all that rubber?
    stop causing that.

    done.
    1977 RA23 Celica -> 1ggte conversion [SOLD]
    MA70 Supra 1JZ 5speed [SOLD]
    Current: IS200 1JZ VVTI 6 speed

  8. #8
    Junior Member Domestic Engineer J0RD0's Avatar
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    Default Re: 1jz fuel economy

    Quote Originally Posted by mullett
    you might as well go back to a standard ECU, it'll probably be much better on fuel.

    -RM.
    HA HA you reckon i should spend a couple of grand wiring up a standard computer just to get a few extra ks?
    RA23 1JZ VVTi 373hp - SOLD
    12.4 @ 110mph
    THE EVOROLLA 262.9hp - SOLD
    JZ parts facebook page - https://www.facebook.com/groups/524841910926804/

  9. #9
    Junior Member Domestic Engineer J0RD0's Avatar
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    Default Re: 1jz fuel economy

    Quote Originally Posted by Hash_ra23
    easy fix:
    look under your rear guards...see all that rubber?
    stop causing that.

    done.
    pphhhhhht good one hash i didnt build this car to go to the shops in and do my shopping, i built it for other purposes .
    RA23 1JZ VVTi 373hp - SOLD
    12.4 @ 110mph
    THE EVOROLLA 262.9hp - SOLD
    JZ parts facebook page - https://www.facebook.com/groups/524841910926804/

  10. #10
    Estranged Member Chief Engine Builder mullett's Avatar
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    Default Re: 1jz fuel economy

    Quote Originally Posted by Jordan 76
    HA HA you reckon i should spend a couple of grand wiring up a standard computer just to get a few extra ks?
    It was just an option, depends on how much you changed the standard loom (if you started with it). When I did my EMS on the MR2 I left the standard plug pretty much intact, so it would have been a fairly easy job to go back to the stock ECU.

    -RM.

  11. #11
    Touching Automotive Encyclopaedia Aust162's Avatar
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    Default Re: 1jz fuel economy

    i got 325kms off my jza70 (manual). not sure how big the tank is though.. 60litres+ i'd say.I was babying it most of the time too, so your fuel economy is pretty decent compared to mine!
    *hearts* his 4age powered KE70 Panelvan!
    Hi, Im enthused about corollas..

  12. #12
    Junior Member Domestic Engineer J0RD0's Avatar
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    Default Re: 1jz fuel economy

    Quote Originally Posted by mullett
    It was just an option, depends on how much you changed the standard loom (if you started with it). When I did my EMS on the MR2 I left the standard plug pretty much intact, so it would have been a fairly easy job to go back to the stock ECU.

    -RM.
    nah its motec loom and computer, i only used the plugs off the stock loom
    RA23 1JZ VVTi 373hp - SOLD
    12.4 @ 110mph
    THE EVOROLLA 262.9hp - SOLD
    JZ parts facebook page - https://www.facebook.com/groups/524841910926804/

  13. #13
    Estranged Member Chief Engine Builder mullett's Avatar
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    Default Re: 1jz fuel economy

    325km out of 60L? The hell with that man, my evo does 300 to 40L if I'm nasty to it...I'm curious about these cars with terrifying fuel consumption, are you guys doing a lot of really short (5-10km) trips, or in heavy traffic a lot?

    Also, if your car has a 60L tank, you probably put 55L in...

    -RM.

  14. #14
    Senior Citizen Chief Engine Builder "Z" UTE's Avatar
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    Default Re: 1jz fuel economy

    VVTi 1JZ stock ECU in an RA23 got about 9-10litres per 100k on a trip,(Canberra to Dubbo) and anywhere from there to 15 litres per 100k when having some fun.

    The low down pulling power is a characteristic of the VVTi.

    cheers Chuck.
    "What man can build, man can fix!"
    MS51Crown Coupe,
    GSV40R Aurion luxo tourer. One TA22 currently receiving some TLC prior to paint One RS56 Crown ute under construction, 2 x TA22's awaiting rebuilds. Toyota Crown RS47J ute in need of serious TLC. Toyota Crown Custom Wagon MS53 daily hauler stocko!

  15. #15
    JZ Powered Too Much Toyota EldarO's Avatar
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    Default Re: 1jz fuel economy

    Quote Originally Posted by mullett
    325km out of 60L? The hell with that man, my evo does 300 to 40L if I'm nasty to it...I'm curious about these cars with terrifying fuel consumption, are you guys doing a lot of really short (5-10km) trips, or in heavy traffic a lot?

    Also, if your car has a 60L tank, you probably put 55L in...

    -RM.
    they're about 63L, so you whack pretty close to 60L into em.

    they do chew fuel,might have something to do with the 1J (standard) never actually being off boost.

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