KKtrips Posted June 29, 2009 Share Posted June 29, 2009 Hi guys - those of you out there who have an Datsun L6 help me out and let me know roughly what fuel milage you are achieving. I have a stock albeit 25 year veteran Datsun L26 and with twin SU's On a 50-60L tank I achieve around 200 - 250Km round town around 300Km round town and occasional motorway driving 380 - 400Km on a long distance trip I can watch the fuel gauge move as I am driving and it distresses me at the amount of fuel my 240 uses. I'm sure its a lot more than it should do. (it used the same amount when it had a single carb, the twin SU's have made negligible difference) Any stats you guys have would be appreciated. Cheers PS - I am a fairly nanna driver 99% of the time so its not the lead foot causing it. Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted June 29, 2009 Share Posted June 29, 2009 You only need 2doors and two seats ... that is bad fuel economy though! Quote Link to comment Share on other sites More sharing options...
mark105 Posted June 29, 2009 Share Posted June 29, 2009 my L24 does about 300ish around town and about 450-500 on the open road on a 45L tank in the 240k the old L20e in the 260 used to do about the same i think but on the 60L tank the 260c has. 240k is better cause its a few hundy kg's lighter id say. Quote Link to comment Share on other sites More sharing options...
Rusty Posted June 29, 2009 Share Posted June 29, 2009 smaller jets? Quote Link to comment Share on other sites More sharing options...
fuel Posted June 29, 2009 Share Posted June 29, 2009 how's the ignition timing looking? does it have functioning vac advance? exhaust not restricted in any way? brakes partially binding? does it have an aftermarket electric fuel pump possibly over-powering the float bowl valves in the carbs? what colour do the spark plugs look like when they are pulled out? does the oil go black real quick after an oil change? Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted June 29, 2009 Share Posted June 29, 2009 smaller jets? I lold, quite heartily Quote Link to comment Share on other sites More sharing options...
Guest Posted June 29, 2009 Share Posted June 29, 2009 mine really wasn't any better than that eh haha, but i did tend to have my foot either flat on the gas or the brake, getting it to change out of first etc.... lol does it feel like its running smooth or what? feel slow? always been that bad? Quote Link to comment Share on other sites More sharing options...
fuel Posted June 29, 2009 Share Posted June 29, 2009 is it still 3 speed? perhaps that's not helping either. I don't feel so bad now that the VR-4 sucked a 55L tank dry in 300kms open road driving trying to refrain from boosting. Quote Link to comment Share on other sites More sharing options...
84_S12 Posted June 29, 2009 Share Posted June 29, 2009 How's the thermostat? Quote Link to comment Share on other sites More sharing options...
FLAWLES Posted June 29, 2009 Share Posted June 29, 2009 viewtopic.php?f=14&t=18251 get that, surposedly it does 800km per a tank i have my doubts but yea is it 3 speed? my old 4m powered mega beast 4spd crown nailed a trip to palmy from hamilton, i was rather chuffed maybe 4m the datsun lol Quote Link to comment Share on other sites More sharing options...
Spencer Posted June 29, 2009 Share Posted June 29, 2009 if someone in welly's has a wideband chuck it on there see what its up to know a few people who have got there carby cars running very economically with a wideband tune up Quote Link to comment Share on other sites More sharing options...
KKtrips Posted June 29, 2009 Author Share Posted June 29, 2009 Timing is bang on spec - and advance is how it should be (mech and vac)- mechanical fuel pump, and I doubt its flooding the carbs- plugs are pretty much spot on - brakes ain't dragging at all - oil does go black, but no faster than I would expect in an old car. thats what is so mystifying - there are no obvious signs that it is overfuelling or that it is leaking the fuel BTW - still 3 spd, but top gear is 1:1 same as the 4 spd (and most likely 5 spd too) Quote Link to comment Share on other sites More sharing options...
KKtrips Posted June 29, 2009 Author Share Posted June 29, 2009 smaller jets? I lold, quite heartily I bit my tongue - quite hard Quote Link to comment Share on other sites More sharing options...
fuel Posted June 29, 2009 Share Posted June 29, 2009 Timing is bang on spec - and advance is how it should be (mech and vac)- mechanical fuel pump, and I doubt its flooding the carbs- plugs are pretty much spot on - brakes ain't dragging at all - oil does go black, but no faster than I would expect in an old car.thats what is so mystifying - there are no obvious signs that it is overfuelling or that it is leaking the fuel BTW - still 3 spd, but top gear is 1:1 same as the 4 spd (and most likely 5 spd too) in a 5 speed 4th gear is usually 1:1, and 5th is usually anywhere between 0.6-0.8:1. It's the other two gears I'm meaning, in a 3speed it's putting more work on the engine trying to move the slug, I bet 1st gear is somewhere between 1st and 2nd (probably closer to 2nd) on a 5 speed. Does it go any better with the twin SUs? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted June 29, 2009 Author Share Posted June 29, 2009 if someone in welly's has a wideband chuck it on there see what its up to know a few people who have got there carby cars running very economically with a wideband tune up Do explain what a wideband is? I'm suspecting you mean an Air Fuel Ratio meter? Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted June 29, 2009 Share Posted June 29, 2009 if someone in welly's has a wideband chuck it on there see what its up to know a few people who have got there carby cars running very economically with a wideband tune up Do explain what a wideband is? I'm suspecting you mean an Air Fuel Ratio meter? ^you got it in one. tells you exactly what fuel/air ration is instead of just lean or rich Quote Link to comment Share on other sites More sharing options...
Spencer Posted June 29, 2009 Share Posted June 29, 2009 yea wideband oxygen sensor, not cheap but someone in wellys may have one. sentra dave has one he may send down or something. Can use it to super lean out your cruise mixtures and see where its using all the gas Quote Link to comment Share on other sites More sharing options...
KKtrips Posted June 29, 2009 Author Share Posted June 29, 2009 in a 5 speed 4th gear is usually 1:1, and 5th is usually anywhere between 0.6-0.8:1. It's the other two gears I'm meaning, in a 3speed it's putting more work on the engine trying to move the slug, I bet 1st gear is somewhere between 1st and 2nd (probably closer to 2nd) on a 5 speed.Does it go any better with the twin SUs? Extremely keen to keep column shift - therefore 3 spd is mandatory, - and yeah it goes better with the SU's but only when I boot it hard.. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted June 29, 2009 Author Share Posted June 29, 2009 yea wideband oxygen sensor, not cheap but someone in wellys may have one. sentra dave has one he may send down or something. Can use it to super lean out your cruise mixtures and see where its using all the gas Do I chuck it in the exhaust tailpipe or weld in a threaded insert to fit it at the collector? Quote Link to comment Share on other sites More sharing options...
mark105 Posted June 29, 2009 Share Posted June 29, 2009 whip it up the tail pipe seems to do the job just fine. Not like your EFI so wont have a narrow band in there already. Quote Link to comment Share on other sites More sharing options...
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