Jump to content
SAU Community

Is It Normal For Me To Be Getting Just Under 300km Out Of 50l?


Recommended Posts

Is this normal? 17L/100k is a bit ouch. I'd hate to think that I'm burning a hole in my pocket when I don't have to be.

The car's gone 100,000k but the previous owner drove it like it was a shopping trolley, so the engine should be in pretty top condition.

Assuming it isn't normal, what are some possible reasons I would be getting such low k's? Might be worth mentioning that it feels like it's running a bit more sluggish than it was when I got it several months back (but I could be imagining things).

Thanks.

Service the car see how you go, plus how do you drive, i get about 450k a tank on a highway run at 7 psi (syd to melb) but about 300k driving around town at 10 psi with the occassional bit of fun, and about 200k when im driving the Putty Rd at 14 psi with alot of RPM.

that is pretty bad. i would get 450ks when it was stock. now i get 400kish with light mods. what mods does the car have? might need a tune depending on what you got.

The guy who owned it before me installed a performance clutch and exhaust, but that's it, so it's pretty much stock... Can't imagaine that either of those would affect fuel economy right?

Service the car see how you go, plus how do you drive, i get about 450k a tank on a highway run at 7 psi (syd to melb) but about 300k driving around town at 10 psi with the occassional bit of fun, and about 200k when im driving the Putty Rd at 14 psi with alot of RPM.

Yeah that was my plan (to get it seviced), just thought i'd try to find out a bit about what it could be before I took it in.

Thanks for the responses.

r34 gtt here with light mods and tune and serviced and I get just under 300kms out of 50L ... that's city driving, 11.5psi and an occasional squirt here and there.. So that's about 17l/100kms

If I was driving it like a shopping trolley it would probably do 350kms out of 50l which is about 14l/100kms so I think there's nothing wrong with it.

Edited by Delta Force

many things could be causing this

-O2 Sensor

-Coolant Sensor

-Fuel Mixture

-Driving Style

-Injectors

-Filters

Could also be getting a wrong reeding on the cluster itself.

I would take it to a workshop as if you end up checking all of these you will end up wasting alot of time and money when it could only be one thing :P

hope i helped

I am facing a similar situation

Mine is similar car, R33 Sedan RB25DET......automatic tho

I get 14L/100kms driving without boost...... the factory specification is 11L/100kms

I find these two sites useful, want to share with you

http://www.aa1car.com/library/2002/us30232.htm

http://autospeed.com/cms/A_2597/article.html

check ECU codes

check oxygen sensor

do a minor service, like change engine oil and oil filter

clean AFM with contact cleaner leaving without residue

check tire pressure*

change fuel filter

check for vacuum, boost leak (get a plastic container from BigW 80mm diameter and then put tire valve and plug it in to AFM, pump pressure, hear sound)

if you have money, get injectors cleaned and check/changed spark plugs......but is costly, so try a bottle of Nulon Fuel System Clean

gearbox oil...i heard that it will affect fuel consumption as well...correct me if wrong.

coolant temperature sensor, thermostat .....also possible.

update us if there is improvement

cheers

check ECU codes

check oxygen sensor

do a minor service, like change engine oil and oil filter

clean AFM with contact cleaner leaving without residue

check tire pressure*

change fuel filter

check for vacuum, boost leak (get a plastic container from BigW 80mm diameter and then put tire valve and plug it in to AFM, pump pressure, hear sound)

if you have money, get injectors cleaned and check/changed spark plugs......but is costly, so try a bottle of Nulon Fuel System Clean

gearbox oil...i heard that it will affect fuel consumption as well...correct me if wrong.

coolant temperature sensor, thermostat .....also possible.

Anything adding additional friction to the car will make its fuel economy worse. E.g. under-inflated tyres will have more contact friction with the road, hence worse economy... If you oil is sludgy and full-of-crap then it is possible for it to slow down things in the box/engine/wherever and increase economy...

I have a 235rwkw r33 and I get round 500km per tank when driving pretty normally, 550 in the highway... i had worse economy before I had the engine tuned.

I have replaced my O2 sensor, replaced the vaccum lines, service with good oils every 5000km, check my tyre pressure once a week (or maybe once every couple when i'm lazy). Checking the ECU for fault codes is pretty important.

what tyre pressure is ideal for 18's on an r34 gtt ? Right now I think I'm at 32psi which i believe was what the tyre place recommended..

I'm currently trying to go for a couple of weeks on 'cruise mode' only ie. as little boost as possible by shifting prior to 3000rpm and taking it easy in general. If it turns out I can get 350-400kms out of 50l I'll know there's nothing wrong with the car and it's just my driving style ...

Heck it's one thing I enjoy and to hell with the extra $100 in fuel money a month if that's what it takes to have some fun!

I'm still running with the original RE01s that came with my car and I put in 37lb in my 18s Denis.

Back to the thread,

With suburban (but not city driving), I'm easily getting 500Km/60l = 12l/100Km

HKS F-Con Pro-V ECU.

Envy Dyno showed that my A/F ratio was running well.

Hope you get to the bottom of the problem soon eh?

Tez :P

I've done 170Kms since refuelling and it's just under half full now ... so my economy based on this is still 16-17l/100Kms and that's with very early shifting (2500rpm), no boosting (other when absolutely necessary) ...

So yeah I think I have a problem somewhere as the economy should be a lot better when driving around like a granny..

I've done 170Kms since refuelling and it's just under half full now ... so my economy based on this is still 16-17l/100Kms and that's with very early shifting (2500rpm), no boosting (other when absolutely necessary) ...

So yeah I think I have a problem somewhere as the economy should be a lot better when driving around like a granny..

170km isnt very good, id wanna see at least 200 out of half a tank. My last 2 tanks im seeing around 230 half a tank and the last fill was 475 at it was dead empty, worked out to be 11.7/100 and thats driving every day to work in peak hour on Boost 98. This tank its a little worse , done about 435 and she needs filling thats on 100 octane.

i am on my first tank in my r33 gts-t.. just creeped under half a tank.. at 320km's

car is 100% stock!

bottom half of tank might go quicker tho.. so will have to wait :D

I'd be happy with 16l/100Kms economy if that meant my normal driving ie. boost when I feel like it and not think about fuel. In fact that's the economy I was getting before my last service when the oil and spark plugs got changed ... so I will be taking the car back to see if they can find the issue. It could be a dead O2 sensor or something like that. 16l/100kms when driving around at 2000rpm just isn't cool :|

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

    • That's the thing. Especially at idle, changing the cam angle by that much could be spewing more fuel out the exhaust courtesy of everything happening that bit later. More fuel also means more air (if the fuel didn't burn, then neither did the O2) and so the O2 sensors can start to tell interesting but misleading stories. And the specifics of what is happening could easily be affected by everything else you changed as well. And it could be dynamic, where a few revs more or less could somewhat change how the engine is breathing.
    • Good idea on the temp probe. The mv readings of the O2 sensors are very similar to one another, as is the injector pw. I went through logs in the past to see if there was a discrepancy and there is. Because they alternate up and down as narrowbands do.. they do often 'switch' as to which one is more. They were never 20%+ (more like 1-2%) so it's possible the difference between 20 and 15-17% is a similar discrepancy to 2.0% and 1.7% which I wouldn't have really noticed in the past. We did think about spacing the strut brace. Unfortunately the ~20mm that the GTR brace is lower than the GTT brace is effectively what you need to clear the vents. Moving it up would make it very uncomfortable, but it's plausible that 10mm is a unhappy medium between both hard places... The good news is.. using MR HAMMER it was actually pretty easy to bend back the bent bits to make sure the guard and headlight/new headlight tabs line up right. Yes, we used a R34 GTR guard to make sure the bolt holes all lined up with a known straight guard. As above, you can see the side skirt and the GTR guard are not meant to play together, but everyone seems to think this is a simple fix to the point where nobody who has had these talk to one another mentions how... ...so I'll just assume they know how to fix it when it comes to paint jail time again. Whoever they are. Nobody returns my calls. There's so much changed with regard to the ECU and the car.. that the next step really is to connect the scanner and attempt to drive the thing. It'll be pretty clear pretty fast how in or out everything actually is...
    • That's nasty! I think there is perhaps an inherent problem is using elastomers in such environments. The whole thing can and will get quite hot, and elastomers are not famous for their temperature resistance. On top of that, if the components are cast rubber or urethane and so on, there might be QA/QC problems with bubbles or voids in the material that could critically change their performance. They might just tear apart after being squished (presuming that any elastomers are used in compression rather than tension, I'm thinking that you squeeze one with a void in it and it tears the wall of the void to the outer edge of block, then the next time it extends or otherwise twists, it just gives up). This is all purely hypothetical, but it makes me wonder if the things that they have put into it to make it nice to use/live with are perhaps going to cause occasional failures like this. I wouldn't be getting up in arms over it, unless there are many repeats. I have personally ruined an Xtreme clutch - just an HD thing. I can't remember if it was still behind the 20 or was after the 25 went in. But it inverted some of the retaining spring/clip things around the outside. No-one could explain it. It wasn't thrashed, there wasn't heaps of torque being put through it, and there were no obvious problems other than the above. They were quite concerned by the event so they replaced it even though it was a few years old, which was very nice of them. As far as I am concerned, these things happen with clutches.
    • Any damage to the box/input shaft?
    • Hey there Mate , I just got my local guy to install it Waterhouse Performance, Penrith (specialise Nissan/Datsun and other performance cars) , you can do it yourself if you like , AMS has instructions on their website.  Cheers Pac
×
×
  • Create New...