Jump to content
SAU Community

Recommended Posts

Hey guys,

First of all, I'm not sure if it is my O2 sensor that may be cuasing this problem, so any advice would be great :D

Last Thursday evening I filled my car up with BP 98 right to the top and have since been driving my Skyline on a daily basis. At the moment I have just under 1/4 of a tank of petrol left and have travelled about 315km's. I am not very happy with the fuel economy my car has been getting. Yes I know, fuel economy has been discussed many times before but I would like to know what can possibly cause sh!tty fuel economy when I have been driving pretty softly.

Yes I have been giving my car the occasional squirt but 90% of the time its just been off-boost driving. Does anybody know the exact capacity of the fuel tank in the Series 2 R33 GTS25-t?

My car has the usual modifications - turbo-back exhaust, FMIC, air-pod, electronic boost controller. However, since I have owned the car, I have not had it tuned. I am planning to install a HKS fuel-cut defender and then have my car tuned soon.

I am just after some reasons as to why I am getting poor fuel economy? Could it be that my O2 sensor is stuffed? The car needs a tune?

Cheers for any help guys :rofl:

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/
Share on other sites

It says on all websites that the fuel tank capacity is 65L, but I've never been able to fill up over 51L running the needle slightly below E. If your planning on buying a computer or piggyback, buy that first before you get it tuned, that way it will save you having to re-tune it in the future. Your not labouring the engine are you i.e. putting it in 5th at 50km/h or similiar?

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4689523
Share on other sites

You don't gain power from a fuel pump.

You buy a fuel pump if you need more fuel to the engine (ie. bigger turbo)

Or your stock pump is on it's way out, which after 10-16 years I'm betting it is getting a bit worn. A dyno run to check AFR's and checking the pressure in the fuel line will help determine that.

PS. You can't re-tune the stock ECU.

Edited by SKYRYAN
Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4689638
Share on other sites

No. Service the car if you haven't in a while (Oil & Filter, perhaps air/fuel filter and spark plugs). Then if your still getting poor fuel economy then get yourself an ECU or piggyback then get it tuned, scrap the fuel cut defender I say...

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4689683
Share on other sites

How much does a piggy back ecu set you back? As for the fuel-cut defender, my brother brought it and never used it so i can stick it in my car for free if i want lol

It has been around 7500kms since i changed the plugs and 4000kms since last oil/filter change.

Im going to change the plugs/oil filter/oil/air filter etc this weekend

What oil do you guys use? I'm using shell 5w-40, and my cars runs perfect on it:)

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4689735
Share on other sites

when i put my power fc in i didnt notice any better fuel economy. The power was about the same too, the only thing that changed was the delivery of power.

I was getting about 400kms to 45 litres at best. as mentioned above check plugs, fuel & oil filter, 02 sensor.

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4689759
Share on other sites

Give it an air leak test.

I had a few bad air leaks around the fmic.

I was getting 320km - 350km to a tank just putting around with the odd boot.

After fixing these leaks I get about 400km to a tank and obviously it drives alot better too.

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4690607
Share on other sites

Exactly! but at 315km from 3/4 tank that's really not that bad as far as skylines go.

My 32 tuned rich as struggled to get 300km to a 55L tank, lots of highway driving would see about 400km.

I think the Stag has a 65L tank and that gets about 400km/tank around town (hiflow turbo, 1.8T etc) and on the long trips down south I've managed to stretch it out to nearly 600km/tank.

Edited by bubba
Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4690862
Share on other sites

What oil are you using?

I run a 10w in my 25det and i'll get a good 450km out of it easily. but 80% of the driving i do is to perth and back. run pretty much same shit you do except i have had a tune on a piggyback SAFC-II.

Test your AFM. lambda works with that to determine your Air-fuel mix.

Oh, are you running a "de-cat" pipe? if you are, that'll be screwing with your oxygen sensor readings. backpressure = accuracy. like a lotto ball. can never count it until it stops for juuuust a second.

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4690938
Share on other sites

Hey guys,

First of all, I'm not sure if it is my O2 sensor that may be cuasing this problem, so any advice would be great :)

Last Thursday evening I filled my car up with BP 98 right to the top and have since been driving my Skyline on a daily basis. At the moment I have just under 1/4 of a tank of petrol left and have travelled about 315km's. I am not very happy with the fuel economy my car has been getting. Yes I know, fuel economy has been discussed many times before but I would like to know what can possibly cause sh!tty fuel economy when I have been driving pretty softly.

Yes I have been giving my car the occasional squirt but 90% of the time its just been off-boost driving. Does anybody know the exact capacity of the fuel tank in the Series 2 R33 GTS25-t?

My car has the usual modifications - turbo-back exhaust, FMIC, air-pod, electronic boost controller. However, since I have owned the car, I have not had it tuned. I am planning to install a HKS fuel-cut defender and then have my car tuned soon.

I am just after some reasons as to why I am getting poor fuel economy? Could it be that my O2 sensor is stuffed? The car needs a tune?

Cheers for any help guys :)

mate id be happy with 315 and 1/4 left

I have a series 1.5 R33 GTS-T with exactly the same mods as u, (Except splitfire coil packs) and i only get about 320 to a full tank city driving. Stock computers run mega rich man, and even more so when u boost them coz the stock computer is un-tuneable.

An full standalone would be the way to go, because then you can get all your parameters changed depending on if u want power or economy, or a balance of both.

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4691520
Share on other sites

Do you guys reckon it is worth getting an SAFC-II for my car and then getting it tuned properly? So that way i can adjust my fuel settings etc.

Also, I am running a catalytic converter, however once i pass pits the de-cat goes back in, I like my flames :)

Link to comment
https://www.sau.com.au/forums/topic/277239-o2-sensor-tune/#findComment-4691630
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • LOL.... a good amount of people (not all) on that continent seem to know everything and like to measure things in bananas, football fields, statue of liberties instead of the metric system lol.
    • I assume the modules are similar enough, so if you've had no issues I don't see why I would. I have tried to find a wiring diagram for the FPCM / fuel pump circuit, but I can't find it anywhere. Otherwise, I would just do some wire cutting and joining at the FPCM and give the 12 V supplied to the FPCM directly to the pump instead. If you know anyone that could help with wiring diagrams, I'd be very happy  
    • If it dies, then bypass. The task isn't difficult. I have one running on a standard R32 FPCM. That's after nearly 20 years of it running an 040, which pull substantially more current than the Walbro. They're not the same module, but I'd hope it indicates that the R33 one should be man enough for the job. I think people kill them when putting proper sized pumps on them, not these little toy pumps we're talking about here.
    • Silicone spray won't hurt anything. And if it does, that's an opportunity to put some solid steel spherical bushings in, so you can really learn what suspension noise sounds like, If you're going to try it, just spray one bush at a time, so you can work out which one is actually noisy. My best guess is that if the noise started only since putting the coilovers in, then it is just noise being transmitted up through the top mounts of the struts, and not necessarily "new" noise from bushes. But it's almost impossible to know.
    • Are you saying the 34 is SUV height, and not that we're talking about an SUV here? (because if we're talking about an SUV, you don't fix them. You just replace them when something breaks. Not worth establishing sufficient emotional connection with an SUV to warrant doing any work on one). I wouldn't jack my car up on a short little loop of 10mm steel rod poking out through a hole in the bumper bar, front or rear end. I realise that we're probably not talking about that type of loop at the front, being the one under/behind the bar on a Skyline.... but even for that one, trying to jack up on what amounts to a thin piece of steel, designed purely for withstanding a horizontal tension force, not a vertical compressive force (and so would be prone to buckling/crushing) and, my most particular bitch about it - located RIGHT AT THE EXTREME FRONT OF THE CAR, applying a load up through the radiator support panel, etc, with almost the entire mass of the car cantilevered between there and the rear wheels? Nope. Not doing that. Not on the regular. That structure out there in front of the front crossmember is not designed to carry load in the vertical direction. Not really designed to carry any load at all, really. The chassis rail that the tow point is connected to would be fine loaded in tension, as per towing. Not intended to carry the mass of the whole car, especially loaded all on one rail, with twisting and all sorts of shitty load distribution going on. No, I will happily drive up on some pieces of wood, thanks. That can only happen on driven wheels, and they are at the other end of the car, and this problem does not exist at that end of the car. And even then, I have been known to drive up on at least 1x piece of 2x8 each side at the rear, simply to reduce the amount of jack pumping necessary to get the car up high enough for the jack stands. What really really shits me about Skylines is the lack of decent places for chassis stands at either end of the car. You'd think they'd be designed into the crossmembers.
×
×
  • Create New...