Few months ago I finished restauration on my 82' GTV 6 and I started to drive her and I decided to measure fuel consumption because for some reason I was very much suspicious about her fuel consuption.
So I started measuring fuel consumption and I came to conclusion that she spent 19.5 litres on 100 kilometers.I was driving her only in town but I still think that's to much.Why???Because I have also 75 3.0 V6 America also with Bosch L-Jetronic system which has a consumption of 14 litres on 100 kilometers also when driven in town.Now it's winter time in Croatia and I live by seaside and temperatures are from 0 to 20 degrees of celzius which is not to cold and because of that I'm very suspicious about her consumption.
Anybody has some info or idea or previous experience why she is drinking so much fuel???Somebody said that's normal due to old type of Bosh L-Jetronic system but I don't beleive in that story.Thank's in advance.
I can't believe that no Ozzy didn't have a problem like mine.Comon guys don't be lazy to write a few tips at least.
have you checked for fuel leaks when the car is going, being the when the fuel lines are a pressure there maybe a pin hole in the fuel line. thats what the prob with mine is at the moment, also put some injector cleaner in the tank it might be a case of unused fuel being lost when you clean the injection you might find it runs a whole lot nicer to
Nikola,
Original test for "Hard" driving by the English magazine Autocar consumed about 14 litres/100km. So even allowing for ageing of the car, 19.5 sounds like way too much.
Cooler temperatures should give better consumption anyway.
What sort of condition is it in? You could try the "Greg Gordon" tuning checks:
http://www.hiperformancestore.com/Ljetspider.htm
But... I have a 1983 GTV6 and it seems to use a lot of fuel. So much that I haven't bothered to measure it. I'll try and work it out, but it only gets short trips every day, so it'll take a week or 2.
This happened to me on my 3.0l 75. Turned out to be the air flow meter getting stuck open so there was just way too much fuel being pumped in.....new AFM, problem solved.
That's the spirit guys.I was so happy when I saw a different types of answers.I will use all of your tips.Thank You very much.Anybody has some other info or clue where I could look at???
After almost 6 weeks of testing and checking and in the meantime waiting the gas analyzer to come back from servicing we gained something but still I'm not satisfied.With other words I'm very angry and I'm thinking how to set her on fire.Thirsty bitch.
Driving it 50 kilometers on open road and 50 kilometers in the city I measured 14,2 liters on 100 kilometers.Next 100 kilometers I measured 19 litres consumption which I made in the city with mixed driving which would mean fast and normal.
We checked everything and Greg's web page was also helpful.HC,CO,O2 and rest of the parameters were set to normal thru gas analyzer.
One thing I didn't try.The ECU.I have another one and I think I will try with that one so we will see.ECU which is on my car was allready soldered and trouble shooted because didn't wont to start the engine.That was more than 20 years ago.Maybe there is some kind of problem with ECU???
ANYONE,ANY IDEAS,EXPERIENCES
hi there see u r still having troubles, i had my 2.5ltr 90 running at 6.2 ltrs the other day on the highway and occassionly gets down to low 5's around town its doing around 10 to 11 it has me stumped at the moment ill ask some other guys i know to see what they say,
on a different note do you see any off callaways gtv 6 twin turbos around over there as i would like to get my hand on a set of turbos from a wreck
Callaways You won't find in Croatia neither in the rest of the Europe.Their natural habitat is the USA.
See with those guys You know if there is some kind of good tip or advice.
What exactly did you check? AFM?, Cold start injector? TTS? Every joint for leaks (air and petrol)? What colour is the exhaust, and what colour are the plugs? Bit hard to help unless you give us more info.
Last time I measured mine, which was a few years ago now, I'd get around 13-14l/100km in the city, and 9-10 on the highway. So yours does sound a little high. What's the temperature over there?
Quote from: dehne on April 18, 2010, 11:48:38 PM
hi there see u r still having troubles, i had my 2.5ltr 90 running at 6.2 ltrs the other day on the highway and occassionly gets down to low 5's around town its doing around 10 to 11 it has me stumped at the moment ill ask some other guys i know to see what they say,
on a different note do you see any off callaways gtv 6 twin turbos around over there as i would like to get my hand on a set of turbos from a wreck
Wow dehne that must be the best 2.5 V6 in the world if it's that efficient!! Is that the same one with the chip that you've had up to 250km/h? How much do you want for it, that car sounds awesome? I'd be wary of putting turbos on it though, that might lift the fuel consumption a fair bit; probably to the level of a modern japanese 4 cylinder car.
Nikola
I think the diff ratio on your 75 is a 3.59 and one on the GTV is a 4.1 The difference in gearing alone would account for some differences in the consumption between your cars. The shorter one obviously using more fuel. Sticking brakes, low tyre pressures, tight wheel bearings all increase fuel consumption.
What was checked on the car???
1.AFM which normaly gives reaction when screwing and unscrewing the spring for adjusting mixture when connected to gas analyzer.I'm not sure did we checked resistance on AFM.
2.Air leaks clogged and settled
3.Injectors cleaned and tested
4.Cold Start Temperature sensor checked and in good condition
5.Coolant Temperature sensor checked and in good condition
6.Aux Air Valve in good condition
7.Cold start injector working fine
8.Ignition in the right place and engine on position.
9.Thermostat working normaly
10.New spark plugs
11.Throttle position switch o.k.
12.Gas pump double relay working fine
Colour of the exhaust is black but car runs great,no smoke whatsoever and quick response to gas pedal.Car is almost in the factory setting concerning the HC,CO,O2 and the rest of the parameters due to gas analyzer.
20 years ago ECU was opened and something was worked on him because car didn't wont to start.They suceded to solder something inside the ECU and car started.But who can say that they missed something or something happened in the meantime.
Tommorow I'm going to my mechanic and first we will check gases with this ECU and then check gases with other ECU.
There was an episode when we set gases to a factory settings and than 3 days later when we checked again everything was nackered like we didn't touch anything.Tomorow we will see are we going to have a rerun.
Experiences???
I replaced the 2.5L with a 3L about a year ago. Fuel consumption is quite weird!
For example: Full tank - 60litres (never been able to put 75 in?) Open road and around town driving i will get about 400-450 out of the tank. Pretty horrible.
But the other week i was very low on fuel (so low that the light was stuck on even when i turned right) so i put just $20 in - about 14-15 litres. I managed 135k's before i had to fill up again.
Explain that one! But i can have a heavy right foot - Nikola did you think that your driving style has something to do with consumption?
Wow dehne that must be the best 2.5 V6 in the world if it's that efficient!! Is that the same one with the chip that you've had up to 250km/h? How much do you want for it, that car sounds awesome? I'd be wary of putting turbos on it though, that might lift the fuel consumption a fair bit; probably to the level of a modern japanese 4 cylinder car.
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yes sheldon it is the 1 with the chip in highway driving i can drive from bendigo to syd on a tank (being sensible) on good fuel 98oct and the turbos i was thinking for the race car you have gotta do what you can to get more power than what jim is going to built
rumor has it when hes not using the engine nasa is going to borrow it for the spaceshuttles
Quote from: Simon Aarons on April 19, 2010, 10:00:19 PM
I replaced the 2.5L with a 3L about a year ago. Fuel consumption is quite weird!
For example: Full tank - 60litres (never been able to put 75 in?) Open road and around town driving i will get about 400-450 out of the tank. Pretty horrible.
But the other week i was very low on fuel (so low that the light was stuck on even when i turned right) so i put just $20 in - about 14-15 litres. I managed 135k's before i had to fill up again.
Explain that one! But i can have a heavy right foot - Nikola did you think that your driving style has something to do with consumption?
When I drive my 75 3.0 V6 the same way I drive GTV 6 the fuel consumption is less.75 uses 15 litres on lead foot but GTV 6 uses 19 litres on lead foot.
Just to add some more data to the discussion. Finally filled the ALFA up after noting the odometer a month ago. Car is a 2.5L 1983 GTV6, Standard except that the AFM has been fiddled with at some point. Pretty tired engine.
Straight city driving, mostly short trips I managed 15.24 L/100km. The owners manual states "Urban" 14.8 L/100km, so that's pretty close.
AL.
Quote from: dehne on April 18, 2010, 11:48:38 PM
i had my 2.5ltr 90 running at 6.2 ltrs the other day on the highway and occassionly gets down to low 5's around town its doing around 10 to 11
I've just got to call SHENANIGANS on this one. 6.2ltrs/100km ? Are you just reading that off the 1980s trip computer, or actually measuring fuel consumption compared to the trip meter?
What's the trip computer say your fuel consumption is at 250km/h ?
Quote from: al_cam on April 21, 2010, 08:15:45 AM
Just to add some more data to the discussion. Finally filled the ALFA up after noting the odometer a month ago. Car is a 2.5L 1983 GTV6, Standard except that the AFM has been fiddled with at some point. Pretty tired engine.
Straight city driving, mostly short trips I managed 15.24 L/100km. The owners manual states "Urban" 14.8 L/100km, so that's pretty close.
AL.
That what are You saying I consider normal for this cars and electronics from that time and I would be more than happy to gain consumption like Yours.
Yesterday my friend mechanic changed the ECU with another one and fine tuned CO,HC,O2 on the gas analyzer so we will see.I'm going to make some kilometers and calculations.Hopefully will be good this time.I will keep You posted.
I've just got to call SHENANIGANS on this one. 6.2ltrs/100km ? Are you just reading that off the 1980s trip computer, or actually measuring fuel consumption compared to the trip meter?
What's the trip computer say your fuel consumption is at 250km/h ?
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well you are quite welcome to come for a drive to prove it and yes it may be off the trip computer but also i did say i can drive to sydney of a tank and to me the trip comp has got to be on the money for that one it is a 800 odd km drive of a 40 something ltr tank
Can't argue with that - 860km Bendigo to Sydney, 49 litre tank (say 45 litres between topups). That's 5.2 l/100km? Very impressive. Have you got an Energy Polarizer fitted?
not 860km i know a lot of short cuts more 800-820
For my unleaded Gtv6 over 16 years of ownership I have averaged 10.5l/100km, ranging from 8 - 13 l/100km. Mostly city/freeway driving.
Our recent trip to Alfesta (2 up in the GTV6 and lots of luggage).
The car is standard (ZERO mods - apart from cruise control) but in good nick. And I tend to drive it enthusiastically - but do not speed! (Yes you can do both!)
Route was from Canberra via the Snowy Mountains (fortunately no snow then though) and Melbourne to Phillip Island. Then on to the Otways and Ballarat before heading back to and around Melbourne for a bit. Then back home. There was a fair mix of conditions, lots of mountains and windy roads (some very windy) but a fair bit of straight flat highay too - not the best combination for frugal fuel sipping.
Distance: 2714 km
Petrol (mostly 95 RON but some 98 - nothing less): 263.6 l
l / 100 km: 9.71
Which is actually about the same as I get from our 2 litre quad cam naturally aspirated Impreza (and its twenty years younger!)
So, Nikola I would be concerned too - hope you find the solution soon.
DehneOh - wanna share the secret?
Ciao.
Quote from: AlfaACT on April 22, 2010, 08:02:36 PM
DehneOh - wanna share the secret?
Yeah c'mon, 6l/100km and 250 km/h. That must be some kind of magic chip you've got there.
Quote from: AlfaACT on April 22, 2010, 08:02:36 PM
Our recent trip to Alfesta (2 up in the GTV6 and lots of luggage).
The car is standard (ZERO mods - apart from cruise control) but in good nick. And I tend to drive it enthusiastically - but do not speed! (Yes you can do both!)
Route was from Canberra via the Snowy Mountains (fortunately no snow then though) and Melbourne to Phillip Island. Then on to the Otways and Ballarat before heading back to and around Melbourne for a bit. Then back home. There was a fair mix of conditions, lots of mountains and windy roads (some very windy) but a fair bit of straight flat highay too - not the best combination for frugal fuel sipping.
Distance: 2714 km
Petrol (mostly 95 RON but some 98 - nothing less): 263.6 l
l / 100 km: 9.71
Which is actually about the same as I get from our 2 litre quad cam naturally aspirated Impreza (and its twenty years younger!)
So, Nikola I would be concerned too - hope you find the solution soon.
DehneOh - wanna share the secret?
Ciao.
That what You described in Your story is what I call here in Croatia consumption on open road and I think I would take mine on open road and drive around 100 km and see what will I get.I'm mostly concerned about driving thru town.Stop and go,little bit of sideways driving,little bit of normal driving and there I espect to have 14 litrs. on 100 kilometers not 19 ltrs. on 100 kilometers.Testing are still in progress.I will keep You guys posted.Once more thanks to everybody's tips and advices.
First 100 kilometers driving thru town with another ECU I got 14.2 litres on 100 kilometers.That means stop and go,little bit of sideways driving and little bit of normal driving.Tests are continuing and I have a feeling that this time everything would be fine.We will see.
well the secret, lookafter your car only use good fuel, good oil, do not drive like a idiot, and have a autodelta chip in it, but please do remember that i can get it down to these figures but that does not mean i do drive calmly all the time, how could i when i drive an alfa occasionaly you need to let the inner stig out and drive like a crazy man and when this happens the consumption is a little more on the wallet draining side
Second 100 kilometers drive thru town 15.4 litres,also mixed way of driving.Still way bellow 19.5 litres :).
Third 100 kilometers drive thru town 14.4 litres.
Open road 9.2 litres on 100 kilometers.
Problem solved.Faulty ECU.
I'll be giving mine ECU for repair if possible but if not You will see my add about looking for one :).
i have a couple of them if you post the item part number ill see if mine are the same
Quote from: dehne on April 30, 2010, 07:23:44 PM
i have a couple of them if you post the item part number ill see if mine are the same
BOSCH part number is
0 280 001 117
My car is 1982. euro spec and do not have a lambda sensor and catalytic converter.How is the situation in Australia,do You guys have all this or Your cars are euro spec like mine???