Jump to content
SAU Community

Recommended Posts

Hey everyone,

Finally decided to create a thread asking why this is the case with my car.

The main point being - it's eating up a lot of petrol.

This is my first car which is turbo, and I realise GTT's consume more petrol then N/A's.

But the tank before I filled up, I only got 261km's out of almost a full tank.

From what I've heard, that's far less then average.

Any reason why this could be?

Seeing as this car is my baby, it's rarely driven let alone thrashed.

Cheers.

Edited by Swole
Link to comment
https://www.sau.com.au/forums/topic/434493-r34-gtt-chewing-up-petrol/
Share on other sites

Lots of short trips......

Nope, drives usually go for as long as cruises (because they generally are cruises), probably between 1-3 hours.

Got told that the car may have been tuned to consume more petrol and if so I should get it retuned?

Several things come to mind,

Dirty afm

Faulty water temp sensor

O2 busted

Atmospheric bov

Intercooler leaks

Unsure of what half those mean but I'll definitely ask some mates.

Cheers.

Edited by Swole

a tune shouldn't make a car chew more fuel unless you are really relentlessly using the extra power that a tune has unleashed.

otherwise, that kind of fuel usage certainly points to an issue somewhere and the solution is bound to be in the list mentioned above.

take it to a reputable shop that knows skylines and get them to go thru the list testing the various components.

But the tank before I filled up, I only got 261km's out of almost a full tank.

How much fuel did you put in to fill the tank?

Driving style is always a big contributor to fuel economy - good or bad. If you consistently use boost, you will get crap economy. Unless you can CRUISE - on a constant throttle - the O2 sensor will not play any significant role in getting good fuel economy. City driving, or any form of on/off throttle driving, is not conducive to getting the ECU to pay any attention to the O2 sensor. If you let the engine warm up before driving anywhere, then of course you will get crap economy - burning fuel to do no distance doesn't make sense.

No matter how hard you drive a stocky R34 it should not get that bad in terms of fuel economy which indicates there is a problem.... I have had my car tuned from semi stock all the way through to where it is now and it hasnt been that bad on fuel even on ethanol.... Take it to a reputable tuner or mechanic and get it sussed out as you certainly have a problem :)

How much fuel did you put in to fill the tank?

Driving style is always a big contributor to fuel economy - good or bad. If you consistently use boost, you will get crap economy. Unless you can CRUISE - on a constant throttle - the O2 sensor will not play any significant role in getting good fuel economy. City driving, or any form of on/off throttle driving, is not conducive to getting the ECU to pay any attention to the O2 sensor. If you let the engine warm up before driving anywhere, then of course you will get crap economy - burning fuel to do no distance doesn't make sense.

45L before that tank, then 49L after using it.

No matter how hard you drive a stocky R34 it should not get that bad in terms of fuel economy which indicates there is a problem.... I have had my car tuned from semi stock all the way through to where it is now and it hasnt been that bad on fuel even on ethanol.... Take it to a reputable tuner or mechanic and get it sussed out as you certainly have a problem :)

Yep, already got a couple mates who are mechanics to check it out.

Thanks for the responses.

You're lucky, I get 180-200kms out of a full tank of V-Power and the only mods I have are a front mount, exhaust, 12psi boost on stock turbo, tuned to 215rwkw with a power fc, it's got a new 02 sensor, I cleaned out the AFM not long ago, new set of plugs, only thing I can think of is the exhaust leak I have at the moment but I don't think it should be that much.

  • Like 1

I was getting around 13.8-14.5L per 100km with my GTT, 12psi, exhaust, nistune. Changed o2 sensor, afm, fuel filter, spark plugs (1.1mm gap), all did nothing... Then I noticed the car idles a little rough, so I re-gapped my plugs to (0.9mm), clean AAC valve and reset the ECU, car idles a lot smoother and now can do about 12.5L per 100km and thats city driving.

Also if someone has put a low temp thermostat in, or yours is stuck open, then that will also add to poor fuel efficiency. Cold crank enrichment tapers off at 70C so the quicker she gets up to temp the better.

Edited by Missileman

It's been like that always, when it was stock and after the tune, I do do alot of short trips, I'm running PFR8 plugs with a 0.9 gapp, car idles smooth, but you can farken smell the richness when I come to a stop or idle.

I was thinking of cleaning the AAC valve would that do anything, is it the same process as the r33 tutorial write up? Would the exhaust leak be causing it aswell.

Yeah, basically the same, but you need to disconnect 2-3 coolant hose up the top, and you just need to quickly bleed the system after you put the AAC back together by loosening the bolt and start the car and then when coolant start coming up, tighten the bolt and your done. It looked/sounded difficult but it's very simple.

id both be changing you rthermostat and 02 sensor. 100 bucks. if it works great, if not, you have two new parts that you know are fine. 02 sensors are meant to be changed every 40k and most have the original factory one in.

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

    • Did this end up working? Did you take some pictures?
    • And finally, the front lower mount. It was doubly weird. Firstly, the lower mount is held in with a bracket that has 3 bolts (it also acts as the steering lock stop), and then a nut on the shock lower mount itself. So, remove the 3x 14mm head bolts , then the 17mm nut that holds the shock in. From there, you can't actually remove the shock from the lower mount bolt (took me a while to work that out....) Sadly I don't have a pic of the other side, but the swaybar mounts to the same bolt that holds the shock in. You need to push that swaybar mount/bolt back so the shock can be pulled out past the lower control arm.  In this pic you can see the bolt partly pushed back, but it had to go further than that to release the shock. Once the shock is out, putting the new one in is "reverse of disassembly". Put the top of the shock through at least one hole and put a nut on loosely to hold it in place. Put the lower end in place and push the swaybar mount / shock bolt back in place, then loosely attach the other 2 top nuts. Bolt the bracket back in place with the 14mm head bolts and finally put the nut onto the lower bolt. Done....you have new suspension on your v37!
    • And now to the front.  No pics of the 3 nuts holding the front struts on, they are easy to spot. Undo 2 and leave the closest one on loosely. Underneath we have to deal with the wiring again, but this time its worse because the plug is behind the guard liner. You'll have to decide how much of the guard liner to remove, I undid the lower liner's top, inside and lower clips, but didn't pull it full off the guard. Same issue undoing the plug as at the rear, you need to firmly push the release clip from below while equally firmly gripping the plug body and pulling it out of  the socket. I used my fancy electrical disconnect pliers to get in there There is also one clip for the wiring, unlike at the rear I could not get behind it so just had to lever it up and out.....not in great condition to re-use in future.
    • Onto the rear lower shock mount. It's worth starting with a decent degrease to remove 10+ years of road grime, and perhaps also spray a penetrating oil on the shock lower nut. Don't forget to include the shock wiring and plug in the clean.... Deal with the wiring first; you need to release 2 clips where the wiring goes into the bracket (use long nose pliers behind the bracket to compress the clip so you can reuse it), and the rubber mount slides out, then release the plug.  I found it very hard to unplug, from underneath you can compress the tab with a screwdriver or similar, and gently but firmly pull the plug out of the socket (regular pliers may help but don't put too much pressure on the plastic. The lower mount is straightforward, 17mm nut and you can pull the shock out. As I wasn't putting a standard shock back in, I gave the car side wiring socket a generous gob of dialectric grease to keep crap out in the future. Putting the new shock in is straightforward, feed it into at least 1 of the bolt holes at the top and reach around to put a nut on it to hold it up. Then put on the other 2 top nuts loosely and put the shock onto the lower mounting bolt (you may need to lift the hub a little if the new shock is shorter). Tighten the lower nut and 3 upper nuts and you are done. In my case the BC Racing shocks came assembled for the fronts, but the rears needed to re-use the factory strut tops. For that you need spring compressors to take the pressure off the top nut (they are compressed enough when the spring can move between the top and bottom spring seats. Then a 17mm ring spanner to undo the nut while using an 8mm open spanner to stop the shaft turning (or, if you are really lucky you might get it off with a rattle gun).
    • You will now be able to lift the parcel shelf trim enough to get to the shock cover bolts; if you need to full remove the parcel shelf trim for some reason you also remove the escutcheons around the rear seat release and you will have to unplug the high stop light wiring from the boot. Next up is removal of the bracket; 6 nuts and a bolt Good news, you've finally got to the strut top! Remove the dust cover and the 3 shock mount nuts (perhaps leave 1 on lightly for now....) Same on the other side, but easier now you've done it all before
×
×
  • Create New...