Bad Fuel Economy

[WetGTR]

and trust me i dont always give it a hit, u cant drive it any diff, it just chews fuel....

<{POST_SNAPBACK}>

Keep us informed about how it goes with the tuner

[mass_iv]

will do, i hope its just a small issue.... and hopefull he wont slug me.

[WetGTR]

I was hoping there won't be any charge actually, should be, well hope it to be part of their after sales service, hope that this type of thing still exists.

I know my tuner in Melbourne always gives me aftersales service & I always go back to him and recommend others.

Hope all tuners out there adhere to the same principles

Edited October 24, 2005 by WetGTR

[FATGTS-R]

I hope they look after him as well.

My car has gone back after initial ecu install at least ten times ( one occasion they used 120 litres of fuel and 15 sets of plugs) with niggling dramas and I have never received an invoice. Top guys. But to be fair they were not the cheapest workshop out there but its paid off with the phenomenal after sales support.

If your initial tune was dirt cheap I dare say they mapped for outright power/safety and not much else. Going back asking for economy might incur a bill. As the saying goes you get what you pay for. Good luck.

[Dee 33]

I'd be very suss about that fuel economy level. Take a look at what I have. Ive used your template as we have similar mods.

List of Upgrades:

1) T04e 460hp Turbo

2) Wolf3Dv4

3) Walbro fuel pump

4) Stock Injectors

5) Fuel Pressure Regulator Malpassi

6) No AFM (Wolf Map Sensor)

7) 240rwkw

If I drain the tank to pretty much empty I'll get 400km a tank. However, this is quite conservative driving.

[mass_iv]

i understand all the thoughts going round, but i will be taking the car back to the tuner... as for getting what you pay for, i paid $700 for the tune which is not that cheap.... hopefully he will come up with something and maybe ill get same if not more power with better fuel economy.

[ECR033]

Go and speak to your tuner - he tuned the car, so he should be the best person to diagnose what's causing your bad fuel economy (presuming he's a decent tuner) and therefore hopefully rectify the problem as a result.

It's not un-common for tuners to have to perform a bit of a 'touch up' after an initial tune. They can't always get it 100% right first time after a dyno tune as obviously normal street driving can dish up a number of different driving conditions as opposed to the constant conditions on a dyno.

You have to also remember that your tuner isn't a mind reader. You need to speak to him so he can understand exactly what you're after. If you told him to tune for maximum power, then he probably predominantly concentrated on your top end power. You do have standard internals (I think), so your tuner was probably being safe by running the car a little rich in the top end. Presumably, he didn't pay as much attention to your light load AFR's (which he probably should have done regardless of whether you told him to or not), so they're probably a little rich as well. If that's the case, he should be able to pull some fuel out there which should improve your economy as that's where the majority of your daily driving probably occurs.

Good luck. Let us know how you go.

[mass_iv]

yeh will do guys, i havent had a chance to speak to him yet, but i will be having a chat, i think he has run it a little rich to be safe, but i dunno if he meant it to be as rich, it has a bad flat spot at about 2000rpm, which i thought at start was just the huge GT30R, but now its become obvious it just a fuel prob....

ill keep u guys up to date

[WetGTR]

Well its a start!

Alot of tuners always think that way -

If ever in doubt just run it rich

It can be very over done at times.

Has to be a balance - good tuners are getting that balance correct.

[Tangles]

Query: Did you reset your ECU after the addition of the new aftermarket parts?

If not, do so, it might help somewhat. From what I understand, you should always reset the ECU after adding new parts. And you wont 'lose your tune' that you just paid for, as such.

Hope that helps?

Brendan

[R31Nismoid]

He has a PowerFC, since when has the PowerFC been a self learning one?

The STOCK ECU learns to a very limited degree but thats about it... its hardly a "great" adjustment anyhow.

[randominsanity73]

I dunno what's with my car then, but I get better fuel economy when I thrash it for the first 1/3 of a tank or so...just seems to burn more efficiently or something. Again, my R is fairly standard (310ps @ 1.0 bar), but if I drive it like a nanna everywhere, i'm lucky to 430km's to the tank. When I give it stick everywhere, I get 470....Go figure.

Maybe there's something odd about the way my car is setup *shrugs* I have a mines ecu, pretty sure there's an aftermarket fuel pump in there but dunno what as it came over from Japan like that.

Hope your car gets fixed up soon though

[mass_iv]

all fixed up now guys, he was happy to have a look at it, at no extra charge.

[mass_iv]

it seems a little better, but i guess ill have to wait and see.

[justin911]

mass_iv did ur tuner redo ya pfc maps ???

I've got the same problem as u.. my pfc wasnt tuned for econemy.. let us know how you go please

[Spook's_Skyline]

something else to consider for bad economy

ive been getting approx 350 ks to a tank

when i got my new fuel pump fitted, foudn out that my fuel lines were perishing and that there was a fuel leak!

if u got an old car, its worth checking out

ive replaced a heap of piping now due its age;

[benl1981]

Where abouts were the lines leaking??? in the engine bay or closer to the tank? could you ever see fuel dripping on the ground.

[WetGTR]

hmmmm its gooood!!

Nice to hear that he didn't charge.

I think its a good idea to always try discussing your problem if your not happy with something. At least it gives them a chance to discuss it.

What the worst that can happen....they do nothing, your no worse off.

If your still not happy, go back again. Same situation as above.

Hope all it well now and keep us up-dated.

[mass_iv]

thanks guys, seems ok now, i think he just fine tuned it a little more...

as for those leaking lines, i wudnt mind knowing where abouts i should look, as i have already replaced the lines from the fuel filter to the rail and just before the filter.

[Spook's_Skyline]

i would say from the pump as he was installing a new pump for me

i could always smell heavy petrol reversing up my driveway, but thought it was due to our lines running so rich

never noticed any leaks

could never smell petrol when the car was left over nite in the garage

Edited November 1, 2005 by Spooks_Skyline