Jump to content
SAU Community

Recommended Posts

Mind if I ask S/K about fuel consumption of 230klm per 50 litres (and that's with a very light right foot) around town but on the highway I get an even 10 klm per litre (various speeds). Would this signify toooooooo rich at around town speeds or am I barking up the wrong tree?

(Power FC + Apexi boost control kit+Apexi Pod filter+Z32 AFM+ 3" turbo back system+FMIC)

Or is someone helping them selves to my fuel?

Just joking about the last part

Cheers

Muz

Link to comment
https://www.sau.com.au/forums/topic/52199-lousy-fuel-consumption/
Share on other sites

Sure is terrible and yep had two tunes done (same bloke - that could be the problem) and produces good HP (210rwkw at 1 bar) but I have it set at only .7 bar most times. Our best local tuner is not PFC literate and those tunes were done at another location.

Cheers

Muz

That doesn't sound too good re: fuel consumption.

Plus shouldn't an r34 be making more than 210rwkw with those mods at 14psi? (sure it might be the dyno, but to me that seems to be 10-20+ odd rwkw off the norm?)

I know it's bad to start saying check this and check that when you don't really have a clue (I'm still new to this thing), but have you had the timing checked? Maybe try a different tuner..

wil..

Thanks wiich,

Ahh no, an R34 GTT in standard form will only put out about 206 kw at the flywheel. That equates to somewhere around the 140-150 mark at the wheels (I'm open to correction from those that will know the correct equation) so 210 is not too shabby under those circs. The problem that I have is reasoning why I get excellent mileage on the highway and really disasterous figures around town.

Go to another tuner you say. Not all that easy when you live 2000klms from the capital city and there are no decent PFC tuners in between. We have to work with what we have unfortunately.

Cheers

Muz

How does your boost come on?

Is it tuned for an aggressive boost ramp?

Maybe if the boost is like a light switch, you are boosting more than you should around town, and when you get on the freeway you aren't boosting, therefore not using much fuel......

How many Litre per 100kms Muz?

I use 13 L/100km on the highway and 15-18 around town normally but have been known to hit 33!

I am also concerned about fuel consumption but I only have a modified stock ECU. I think there must be something in the tune.

Hi Bass Junky,

No, I have a very progressive boost setup and rarely get on boost around town. (can't afford the points after my travels thru NSW).

ABO BOB, Good to hear from you mate. How is the 4 door going, any more trips down to Wakefield? Consumption on the highway is an even 10 or better and around town up above 20. I also think it has to be in the tune but when I look at all the numbers in PFC H/C they mean squat to me. Looks like I will have to invest in a data logit set-up.

yeah, i know mine is running pretty rich as well, gets lots of burps and pops from the zorst ...

pfc is on route from jap (well, when they are in stock) will be interesting to see if it makes a difference

cheers

i get about the same as tang0 maby the s2 mods are more economical but i know my car is running rich  

running 0.9 bar

Hi Bass Junky,

No, I have a very progressive boost setup and rarely get on boost around town. (can't afford the points after my travels thru NSW).

ABO BOB, Good to hear from you mate. How is the 4 door going, any more trips down to Wakefield? Consumption on the highway is an even 10 or better and around town up above 20. I also think it has to be in the tune but when I look at all the numbers in PFC H/C they mean squat to me. Looks like I will have to invest in a data logit set-up.

Highway is very good Muz. Around town there must be something in the tune rather than anything broken. I get 13.6ish on the highway.

I've been to the creek once since I last saw you but I've now had my racing wheels and tyres stolen from my garage so no more racing for a while.

i struggle to get 300kms to 55L driving to work and back (all 60kph zones)

as soon as i hit the highway its awsome, 600kms to 55L when i drove down to grafton.

It must be the closed loop kickin in, i have a standard ecu with a tuneable chip. makes about 200rwhp in a r32 sedan.

Geez A/B,

Sorry to hear about the wheels mate and yes I'm beginning to think that it is all in the tune. Checked the system out this morning on the way to work (via H/C) and all voltages appear to be where they should be so it has to be in the numbers. Oh for a decent PFC tuner up here. Getting to the point where I'm thinking about flying a tuner up from Brisbane just so he can coach our local tuner in the finer points of a PFC. PM'd the other reply to ya.

Mick, I would be happy with anything over 300 around town.

Cheers

Muz

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

    • @Murray_Calavera  If I were an expert I wouldn't be in here looking for assistance.  I am extremely computer literate, have above average understanding on how things should be working and how they should tie together.  If I need to go to a professional tuner so be it, but I'd much rather learn and do things myself even if it means looking for some guidance along the way and blowing up a few engines. @GTSBoy  I was hoping it would be as simple as a large vacuum leak somewhere but I'm unable to find anything, all lines seem to be well capped or going where they need to be, and when removed there is vacuum felt on the tube.  It would be odd for the Haltech built in MAP to be faulty, the GTT tune I imported had it enabled from the start, I incorrectly assumed it was reading a signal from the stock MAP, but that doesn't exist.  After running a vacuum hose to the ECU the signal doesn't change more than 0.2 in either direction.   I'll probably upload a video of my settings tomorrow, as it stands I'm able to daily drive, but getting stuttering when giving it gas from idle, so pulling away from lights is a slow process of revving it up and feathering the clutch until its moving, then it will accelerate fine.  It sounds like I need to get to the bottom of the manifold pressure issue, but the ignition timing section is most intimidating to me and will probably let a pro do that part.  Tomorrow I'll try a different vacuum line to T off of, with any luck I selected one that was already bypassed during the DBW swap. @feartherb26  I do have +T in the works but wanted to wait until Spring to start with that swap since this is my good winter AWD vehicle.  When removing the butterfly, did it leave a bunch of holes in the manifold that you needed to plug?  I thought about removing it but assumed it would be a mess.   I notice no difference when capping the vacuum line to it or letting it do its thing.  This whole thing has convinced me to just get a forward facing manifold when the time comes though.
    • Update: tested my spark plugs that are supposed to be 5ohms with a 10% deviation and one gave me a 0 ohms reading and the rest were 3.9ohm<, so one bad and the others on their way out.
    • 9" wheels are a little too wide for a RWD 32. They can fit. People have put R33 GTR wheels on 32s for years and years. But they are a very tight squeeze. This has been known for about 30 years. As I said - there is no difference between a 17 and an 18 in terms of what will fit. The rolling diameter needs to stay about the same as stock - not very much larger. If you increase that, you will start to have problems. If you increae rolling diamater at the same time as yo increase width, you will have problems earlier. as 9" wheels are pushing the boundaries already, you would need to be careful with tyre choice. I would put 8.5s on the front of mine, but would expect problems with 9s.
    • post up screen shots of your injector tables
    • Diagnostic flow for a code 21 says check signal at the ECU pins, on a voltmeter of some kind it should read 0.1V at idle, 0.12V cranking, 0.15-0.25V at 2000 rpm. Check each coil such that +1, -3 is infinite or very high resistance, -3, +2 should do the same. (-1, +3), (+3, -2), (+1, -2), and (-1, +2) should all be somewhere between 0 ohms and high resistance. If you trace the path from the coil pin all the way back to the ECU in the diagram the resistance you measure at the coil vs connected to the harness should be pretty much the same. 
×
×
  • Create New...