Jump to content
SAU Community

Recommended Posts

Greetings all,

I did a quick search to find my answers and didn't find anything (or im just really crap at using the search function) so if someone could point me to a thread or answer my question here it would be greatly appreciated.

I have an R34 GTR and its running rich (always leaves a shitload of black crap over the rear bumper). I currently get just under 400kms to a tank (thats with a lot of freeway driving).

Would the following items make a huge difference in fuel economy if i changed them?

New O2 sensor

Hiflow Cat

Power FC and tune

Although this is a how long is a piece of string question, how much roughly have people noticed a change in fuel economy with mods such as these, and what other mods could i do to better the economy.

Thanks muchly,

Matt

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/
Share on other sites

Thats pretty normal i rekon for an R34 GTR, considering I have a R33 GTST and i can get 600 from alot of freeway driving, if i did a few mods like a front mount and an exhaust i would probably get maybe 500 and urs being a GT-R sounds about right!

I would get a tune done and see how it goes from there.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4239138
Share on other sites

i had a r32 gtst with plenty of bolt on mods including a t04e highmount turbo setup. when i first bought the car i tested the fuel economy and got 300kms for a full tank as it was running rich as. checked over the engine to see if i needed to change anything before a good tune and i noticed the oil was black as. changed it over with fresh synthetic and got 50kms extra from that.

so i guess do what you can and its usually the small things that can make a big difference and maybe a good retune will make it perfect.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4239158
Share on other sites

Already had a HKS F-Con Pro-V instead of a Power FC when I received it. I run just slightly rich & happy to leave it that way.

A 3" Hi Flo Cat didn't make any noticeable difference to my fuel Eco.

So a good tune and attention to the 02 Sensor may improve things for you.

I've always been able to get 460Km out of a tank via a run along the M/H-way and doing a run up and down Mac Pass to home.

...and 430-440/tank in suburban driving (without peak hour traffic) or 500 on a H-way

What injectors are you using?

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4239254
Share on other sites

400 km / tank is ok, a tuned PowerFC will get you more power AND more fuel economy is your tuner is very good and you don't use the accelerator a lot :P

Normally you do a few mods and get a Power FC and more power, but it's not cheap, and its not going to magically get 600km/tank or something...the best I've ever got was 11l/100km on mostly highway driving in a GTR, with a tuned Power FC.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4240607
Share on other sites

Funny this thread pop'd up cos i just did a quick fuel economy test which ended last night at 360km on the trip computer and down just a mm topping the empty line so i would expect 20-30more kays.

My driving was highway at night, very little stop-start and occasional 7000rpm tacho views.

I have most of the bolt-on mods including the power fc.

I also leave plenty of black carbon deposits on my garage floor and pop flames if i change gear on load.

fuel was shell v-power.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4240658
Share on other sites

^^^ out of interest use bp ultimate and tell us how you go as i noticed a slight difference changing from v power to ultimate.

I cant resist a test; your on! ill do BP ultimate and check knock + fuel economy as ive used nothing but V-power

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4240998
Share on other sites

yeah ive been doing some tests with different fuels.

Vortex 98 was the worst ~13.5km/100km mostly suburban driving.

V power was pretty good @ ~12.8km/100km same conditions, even with a lil more spirited driving

now im trying Ultimate.

But the first 2 are more convenient for me to get cos its on my route to work.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4245433
Share on other sites

yeh same i've got caltex and shell just outside my house but bp is abit more down the road. but always try and get bp ultimate...for some reason i'm getting about 40kms more on bp ultimate doing the same routes and on and off boosting but it might just be me lolz. otherwise it would be good to see how people go form changing from one fuel to ultimate.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4245571
Share on other sites

could i just ask, how many litres are you calling a tank? this is something that shits me about most people that ask for advice on fuel economy. they will say a tank and not how many litres they actually used. so if you have a slightly dicky fuel gauge your economy could be 20 or 30% better than you think.

so either state how many litres you are using to go that many kms, or actually work out your economy like DLOOOK did.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4249492
Share on other sites

I'm averaging 14L/100km from my R. Thats a 50/50 of h/way and suburban driving daily. And alot of that time, im not going over more than 35% injector duty so im not getting up it too often. Im using BP ultimate only.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4250069
Share on other sites

Correct me if I'm wrong but don't R34 GTR's have bigger fuel tanks than R33's?

Anyway, my (stock) R gets an average of 380-400KM from a full tank (~50 litres). And that's mainly city driving. I've noticed that highway economy isn't actually that much better, driving to geelong and back I'll use half a tank and its about a 200Km return trip from my area.

Edited by ras1983
Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4253368
Share on other sites

Run a diagnostics to check both your O2 Sensors, if they are both cycling on the metre then they are fine and no need to change.

High flow cat is alway good as you have a GTR I put one ASAP.

Next time before you fill up, run the fuel tank low to about 1/4 left and put a whole can of injector cleaner in and then fill up with BP Ulitmate (I use IMO)

Next service change your Fuel Filter.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4253477
Share on other sites

I reckon you should be able to get a bit more than 400k if you do a lot of freeway runs.

my 32GTR makes about 400km (fuel light comes on) and its pretty much stock, apart from exhaust and ebc. I do about 50/50 highway and suburban driving, occasionally stuck in traffic jam. I also get a a bit of black carbon crap on my rear bumber. Going to replace the cat soon.

But ye, check your O2, clean your AFM, change your plugs, oil, fuel and oil filter, tyre pressure and see how that goes.

Link to comment
https://www.sau.com.au/forums/topic/243211-fuel-economy/#findComment-4253564
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

    • Join SAU NSW for a flame-grilled feed & flame-spitting cruise! Sunday 17th August 2025 3:30PM Meeting Archies Flame Grille Sylvania Waters 4:45PM Cruise Departure 5:15PM Arrival at Cape Solander Kurnell Meet Location: Archies Flame Grille Final Destination: Cape Solander Kurnell *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
    • Yeah good luck out there! Will be good to see a mighty GTST going harder than the GTRs
    • i will be there 😁
    • Hello!  i just finished manual swaping my r34 skyline with a r33 rb20de box(RB71C)box  When the car is running it squeaks crazy loud and it was smoking from the gearbox area. The gearbox is fine it was tested. The clutch slave cylinder seems like it doesn't fully releases the clutch. I want to ask if this noise is from the throw out bearing or could it be the clutch assembly or disk att.xFliq87Gzw6kImKBVqDebXkj0fBqymk0JaYeP3_3SlM.mp4
    • A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
×
×
  • Create New...