1JZ-GE - new car to me, have some questions

[Jingle Balls]

Hi All, have some questions about my newly purchased JZX90 Chaser.

It's been using a fair bit of fuel ($20 lasts under 100km with sensible driving - which seems high to me). First thought was the air filter, which was indeed nasty, so I tried to get a replacement panel but was told it was uncommon and expensive, so I ditched the facto airbox and did a pod filter setup, retaining all the original sensors and breathers.

I also replaced the spark plugs, which I've found the ones installed were for the previous generation chaser, and slightly longer, so have high hopes for improvement there. But I came across a reasonable amount of oil on the plug out of cylinder 5 (5th from the front). The others seemed OK but looked old, with a slight yellowy tarnish. What does this likely mean? There's no oil in the coolant and the car doesn't over heat.

I'm leaving the battery off over night to clear the ecu and see what mileage I get from these fixes. What other things should I look at or replace to perhaps increase my economy?

[Bling]

It's been using a fair bit of fuel ($20 lasts under 100km with sensible driving - which seems high to me).

Work out how much fuel $20 actually gets you...(f**k all) then take another look at the economy and decide if that's high or not.

[eskimo]

It's been using a fair bit of fuel ($20 lasts under 100km with sensible driving - which seems high to me).

Work out how much fuel $20 actually gets you...(f**k all) then take another look at the economy and decide if that's high or not.

Agreed,

even worse if your running it on 98.. $1.96 per L even 95 is not much cheaper.

the above actually doesnt seem that bad for a strait 6 & assume thats around town.

[blindnz]

my gt-four gets like 130km of $40 around town... the trueno (NA) gets around 105km from $20 so i would think 100km for $20 from a straight 6 is all good

[sergei]

my gt-four gets like 130km of $40 around town... the trueno (NA) gets around 105km from $20 so i would think 100km for $20 from a straight 6 is all good

My fuel economy averages ~12L/100km city/hooning cycle on my ST205
on trueno (20V AE101) it was ~9L/100km (my driving).
on 1GFE (mum's car) is ~9L/100km (mum driving).
So one would expect 1JZGE be around 8-10L/100km.

BTW how much you get out $20 is wrong way to measure fuel economy.

Fill it up, reset trip meter, drive almost full tank, then fill it up again, record litres at the pump and km on trip meter (then you can figure out either L/100km or km/L, whatever floats your boat). Do this a few times. This is the most accurate way of measuring fuel economy practically.

[1I1]

Agrees with Sergei.

If going off the $ per km ratio, my 20v seems to be $40 per 200km which prob isn't too bad considering thats $40 of 98 (so very little petrol )

[Jingle Balls]

thanks for the replies guys. what about the oil on the spark plug?

wow some of you have such crap fuel economy haha. $20 in my trueno got about 135km, in my wrx running 20psi with 800cc injectors, about 100km, and the chaser about 85km. I wouldn't have thought the standard chaser uses more than the modified wrx, especially not by that much.

[Dell'Orto]

Dollar value is pointless, fuel fluctuates too often for it to be a good guide. Hell $20 used to get my RX7 into wellington, around all night and back again

[Alex B]

Agrees with Sergei.

If going off the $ per km ratio, my 20v seems to be $40 per 200km which prob isn't too bad considering thats $40 of 98 (so very little petrol )

Sweet the ITR does that too, guess its not so bad after all.

[Mr Revhead]

Dollar value is pointless, fuel fluctuates too often for it to be a good guide. Hell $20 used to get my RX7 into wellington, around all night and back again

Thats a cheap tow truck!

[Dell'Orto]

More reliable than my MR2 was! Which consequently, used to use $50 of fuel to get from Blenheim to Chch and back

[Jingle Balls]

yeah i know k's for the dollar isn't the best but it's a pretty easy measure to get reasonably close. considering if fuel changes even ten cents that's only going to be an additional coke can of fuel to 10 litres which is going to be 2-3km at best

[Jingle Balls]

If going off the $ per km ratio, my 20v seems to be $40 per 200km which prob isn't too bad considering thats $40 of 98 (so very little petrol )

i did some tests on this and i found that my 4age got more k's out of 98 for the same amount of money as 95, and 95 got further than 91. So 98 not only gives better performance, but the better performance gives better economy for the dollar. I've run 98 in all cars i've owned since then. I'm yet to test this on the big 6 cyl though

[cat007]

Fill it up, reset trip meter, drive almost full tank, then fill it up again, record litres at the pump and km on trip meter (then you can figure out either L/100km or km/L, whatever floats your boat). Do this a few times. This is the most accurate way of measuring fuel economy practically.

I agree

BUT

I have a bit of a problem with carrying an extra +50kg around of fuel for no reason. Hence why I rarely fill up - and will often put ~$40 in at a time.

[Mr Revhead]

If going off the $ per km ratio, my 20v seems to be $40 per 200km which prob isn't too bad considering thats $40 of 98 (so very little petrol )

i did some tests on this and i found that my 4age got more k's out of 98 for the same amount of money as 95, and 95 got further than 91. So 98 not only gives better performance, but the better performance gives better economy for the dollar. I've run 98 in all cars i've owned since then. I'm yet to test this on the big 6 cyl though

Depends on if the cars ecu is tuned for it.
My car gets no better performance or economy on 95 or 98 than 91.
If your car has a performance tyoe engine then 95 or 98 will be better. But if you have an economy type, then 91 will be fine.
Eg a 20v loves 98, a 4afe is fine with 91

[sergei]

Fill it up, reset trip meter, drive almost full tank, then fill it up again, record litres at the pump and km on trip meter (then you can figure out either L/100km or km/L, whatever floats your boat). Do this a few times. This is the most accurate way of measuring fuel economy practically.

I agree

BUT

I have a bit of a problem with carrying an extra +50kg around of fuel for no reason. Hence why I rarely fill up - and will often put ~$40 in at a time.

Well it is not always 50+kg. And you can do it once in a while for statistics.

[deaf_rattle]

Fill it up, reset trip meter, drive almost full tank, then fill it up again, record litres at the pump and km on trip meter (then you can figure out either L/100km or km/L, whatever floats your boat). Do this a few times. This is the most accurate way of measuring fuel economy practically.

or just fill up, do 100kms and then fill up again.

[cat007]

Well it is not always 50+kg. And you can do it once in a while for statistics.

true. Except in this case here he has at least a 60L tank. I wouldn't be surprised if it had a +70L one tbh....

[gt4dude]

I'm using 25L per 100km to and from work with 30% motorway driving

This is figured from a round trip of 61kms with 22kms of motorway driving costing me $15 per day at the current rate of 1.98/L for BP Ultimate 98.

Car is an untuned 1996 ST205 Celica GT-Four with a Gen 2 turbo on a Gen 3 engine (CT26).


EDIT: Sorry my mistake, It's actually 12.42L/100kms. I only factored in the trip there, not the trip home.

[FLAWLES]

Well it is not always 50+kg. And you can do it once in a while for statistics.

true. Except in this case here he has at least a 60L tank. I wouldn't be surprised if it had a +70L one tbh....

yip 70L tank