Fuel problems

[Jarvojj]

Hey Guys

I own a 1997 R33 GTST S2. Recently had a opportunity to fill up the tank and reset the km's

Tank is now empty and Ive done 300km! That is terrible economy. I know its a skyline and i didnt buy it for its thriftiness of fuel but 300km?

Ive heard people doing 450-500 on a tank , this seems to thirsty for me

- Done the 100k service
- Replaced fuel filter
- Replaced o2 sensor
- Havnt been flogging it

What else could cause my economy to be this bad even after I have done the above?

[Ben C34]

How have you established the tank is empty? You could have heaps left.

What you now need to do is fill up and figure out the actual consumption, not some random guess based on a 20yr old fuel gauge..

[Jarvojj]

I put in 50L and I got 300km it works out to be 16.6L to ever 100km 

[Jarvojj]

I did run it dead empty because I ran out of fuel half away down the road, I rolled it down the hill into the petrol station.

[Ben C34]

I would check for boost leaks by pressure testing and clean the Maf.

 

[admS15]

3 hours ago, Jarvojj said:

I put in 50L and I got 300km it works out to be 16.6L to ever 100km 

Thats not too bad to be honest. They're not very economical.

[GTSBoy]

I get pissed off when mine is worse that 13, driving in heavy stop start traffic. R32 with Neo25DET. It has been running 11s lately.

Heavy fuel consumption is very easy to achieve. Launch it, rev it, drive it around in 3rd when you should be in 5th. Pump the throttle up and down so that you never maintain a steady speed (like 95% of the morons on the road). All these things will make a Skyline suck the juice.

Then there's the mechanical issues listed above.

[Jarvojj]

Okay, thank you

[ERO54N]

11s/100 unbelievably good ?

[GTSBoy]

It's been known to run flat 10s occasionally over the last few months. Mostly 10.5-11. Change of route to work has helped. Less stop-start. You'd be surprised how much difference wheel alignment can make too.

[KiwiRS4T]

13 hours ago, Jarvojj said:

I did run it dead empty because I ran out of fuel half away down the road, I rolled it down the hill into the petrol station.

Hang on when did you put in 50L? Had it run out of petrol then too? I am sure your tank should hold more than 50L

Unless you are planning to run it empty again you should fill your tank to the brim and at some point before you run out fill it again and then calculate your L/100km...you may be doing worse than 16.6 L/100

Jack up each end of the car and spin the wheels to see if any are binding. Check your tyre pressures. Do you accelerate up to traffic lights and stop signs and then jump on the brakes? Is this mainly city stop start traffic?

 

[Slap]

How stock is the car?

my ss crewman gets 12/100 pushed it to 16/100 towing, my 32s 20det is better, and a led foot will equal them.

If you were light footed thats bad economy for stock,

Has it ever been modified or tuned maybe for e85 cause that sound like e85 ks to me?

(Not saying put it in and see)

[Jarvojj]

So I went to a different fuel station and put 50L in and I got 409.5km to it

[Slap]

Thats better

[Jarvojj]

1 hour ago, Slap said:

Thats better

I was going to United but I went to Caltex and got that, and couple days ago I went to BP and I’m around half a thank and I have got 200km

[Ben C34]

are you sure you are calculating use properly?

should be fill up and zero trip meter. drive around. fill up and record liters used, look at kilometers traveled then do math.

i get a feeling that's not how you are doing it?

[Slap]

United.. probably a high ethanol blend 95 or 98.  I smell the ethanol in there 91.

Most 95 and 98 contain no more than 10% . Becarefull  if its special blend 98 it could have more.

The pumps need to state when they contain %10 or less. If they dont who knows how much it was blended to meet the specific octane.

[GTSBoy]

2 hours ago, Ben C34 said:

are you sure you are calculating use properly?

should be fill up and zero trip meter. drive around. fill up and record liters used, look at kilometers traveled then do math.

i get a feeling that's not how you are doing it?

 

And the math is trival. 409.5 km? 50L? The process is 100*50/409.5 = 12.2 L/100km. And that is a perfectly fine consumption rate. More or less exactly what I got on my last tank. Of BP. Never use anything else. Even Shell 98 is not as good.

[KiwiRS4T]

2 hours ago, Ben C34 said:

are you sure you are calculating use properly?

should be fill up and zero trip meter. drive around. fill up and record liters used, look at kilometers traveled then do math.

i get a feeling that's not how you are doing it?

What worries me is the way he keeps putting 50L in. Does he run it empty and co-incidentally roll in to a service station? I doubt it.

[tridentt150v]

I have 300rwkw and I get 9.8l/100km...…..and I know I get this because I drove to the GC and back.  So 2400km, up the Hume then the Pacific with a bit of messing around first in Penrith then in Parramatta before continuing to the GC.

I drove around the GC a bit going to Wally World's etc, then when I came home I went through to Lismore then up to Tenterfield and back through the west of NSW [Tamworth, Dubbo, Forbes, Young etc].

So not a lot of traffic [but still some], and mainly highway cruising 100 to 120km/h.  Climate control was on, it was warm but not stinking hot.  I reckon if you can't do that with a well set up mildly tuned Gtst then you need to do some navel gazing.

I do have WMI....not sure if this makes a difference though cos I only used 2.5 litres for the whole trip.

Biggest single distance was something like 519km between fills....but that's from memory, I didn't log it.  It was over 500 guaranteed.