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Engine Specific Info and Questions => IDI Engine => Topic started by: 89VWdieselGolf on January 23, 2008, 03:20:28 pm
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I just figured out my mpg's with the new diesel (new to me, trying to save fuel cost vs. my turbo gasser mk2) and it got 32 mpg. I don't think thats too great seeing as my gasser got 29 before i added the turbo.
i've cut away the air box to get more air flow, turned up the IP a little bit to get a bit more power, running 0w40 synthetic rotella, and it idles a little high.. maybe 1000rpm.
other then the idling, i cant see why fuel mileage would be decreased unless the fuel filter is old.
whats "normal" for a N/A?
thanks,
Jeff
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that's what i got before any tune up , synthetic oil, etc.
on the highway i get almost or just 700 km's to a tank. I think it's a 70 l tank, right?
so 10 km's /l
oh wait, that would 45 mpg. oh well that actually sounds a little high. could be why i only have to fill it every 2 or 3 weeks in town though. In town i get about 500 km's per tank 1/2 city 1/2 highway driven hard.
either that answered your question or depressed you. sorry.
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I was greatly disappointed if I hit less then 800kms/tank on my 92 1.6 TD. NAs should get mid 40s easy. what's your timing at, condition of injectors, what tranny are you using, what are your shift points, do you have any smoke, how;'s the air filter etc ect
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yeah you should be getting at least 40-45 mpg.
BTW that wasn't 45 mpg i'm getting, it's actually about 30mpg
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i've gotten that bad before... depends how you drive. although my td never seemed to changed whether i drove really fast or really slow
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My 91 1.6 NA Golf gets about 800 km per tank. My 86 1.5 NA Golf got 1000 km per tank. Gearing is different on the 91, so it accelerates noticeably better, but loosing 200 km/tank is hard to take. I haven't calculated actual mileage on the 91, but my best on the 86 was 56 mpg (Imperial).
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I had to squeeze my NA 91 Golf to get 1000km per tank. Once I even sputtered into the filling station just over 1000km of all hwy driving. That is really quite good and you seen my Golf. It was looked/sounded like a heap of crap. Also, the mileage dropped significantly when I put the new trans in. Geared much different and revved faster on the highway.
Does your engine reach operating temps? I have to put a piece of cardboard behind my grill to allow it to warm up. Did you check the compression? Is it slower than it should be? Also, check the return line to the tank, they can leak. You would notice a leak in the injector lines so that couldn't be it.
Compression test will tell you a lot. Could be your rings. Do the tests that I mention and if you find nothing, then its probably internal. In the worst case otherwise, it would be your injectors. Ive heard horror stories of V8 fuel economy with VW diesels and it was rectified with rebuilt injectors.
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I have the window sticker from my 86 Golf NA Diesel, it states........
37 MPG City and 44 Highway for 97 CID 4 cyl Diesel with 5 speed trans. An estimated annual fuel cost of $450.
Manufacturers Suggested retail price
Golf Diesel 2-door $7,580
4 speaker prep $145
Air Conditioning $695
Power Steering $235
Destination Charge Wetmoreland, Pa. $320
Total $8975
I got a little less in mileage stated on the sticker but the car had 240,000 miles on it. Now it has a turbo motor and I get about 33-37 around town. And maybe 38-39 highway. But I drive with a heavy foot and like to keep the turbo boost up.
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32.2 mpg?
Sounds a little low. My 80 Dasher diesel wagon got 33.6mpg on a 3600-mile trip, pulling a trailer(2400 lbs., total weight 4660lbs).
J.R.
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i just got 41.9mpg in mine, and thats the lowest that ive ever recorded for my NA... usually i get about 44mpg, but its gotten 48mpg before...
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well its a 55L tank to start. and the air filter is new, using 0w40 synth. oil. not sure what it revs at on the highway (tach doesnt work) but im not sure how new the fuel filter is. I drive about 130km/h on the highway. i've turned up the IP a LITTLE bit to get a but more power, smokes a bit but not much, maybe i'll turn that and idle down.
BTW, the last fill up i put in 54.5L (remember its a 55L tank) and got 667.1 kms to that tank
thanks for all your numbers guys,
i'll mess around with it and see what happens
Jeff
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find your tranny code and go to www.scirocco.org/gears and you will figure out what your RPM is at 130. That's probably why your mileage is so poor
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"AWY ('90 Diesel)" I assume thats mine (btw, i use that site all the time, its great!)
4147RPM :roll:
no wonder.
if i had an AUG (as crappy as they are) it would be 3863RPM, but that would be even worse acceleration.
BTW, i just ordered a new fuel filter
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I think AWY is for the eco diesel only but I could be wrong.
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So what, your saying it is an AUG (I'll check that out next week when i bring it into the shop to do some work on it)
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It could have an ACH as well I think
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that says 85 therefore it would be the CE1 reverse light connector correct??
although if it were, it would be 3495RPM
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that chart is not perfect although it is very good.
I don't own a lot of NAs, so who knows :lol:
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My diesel is 30 years old now and its gets 41 MPG. That's at a constant 75 MPH, driving 360 miles, one way. I can drive the full 360 miles and a big chunk of the way back before I have to fill up.
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ya but thats a consistent 360miles, so like that would be alot easier. Although 75mph is about 130kmh. we'll try the fuel filter, turn down the IP and see what happens[/quote]
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I commuted in a 92 NA for years and the moment I went above 120km/h, my milage went right into the outhouse. My mech at the time swapped out the 5th and waggled his finger at me repeating "below 120 to save the money!". I did it for two weeks: My wallet was thicker! :D
120 seems to be the magic number no matter what with these cars. My experience anyway.
Cheers,
Andy
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(http://img395.imageshack.us/img395/2712/comparison2jl9.jpg)
the closer you can keep it to 2k rpm's, the better your mileage, but more strain on drivetrain components (if you're using a real tall 5th gear)
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i just read that page, but from what i gathered (which wasnt much to be honest :oops: ) is that mod is for a turbo car. If im reading it wrong and it can be used for an N/A car... what needs to be done?
edit... ok after reading it over again (and again) i see what they are trying to. So i need to adjust the screw that changes the fuel flow (the one VW puts a band around) until it reaches the right IP pressure
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ohhh ok i get it now.... just need to make up some gauge to measure it.... so does this work with both turbo and n/a's? and is the internal pressure supposed to be the same between the two. (again, i assume that thread if for turbo diesels)
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"AWY ('90 Diesel)" I assume thats mine (btw, i use that site all the time, its great!)
4147RPM :roll:
no wonder.
if i had an AUG (as crappy as they are) it would be 3863RPM, but that would be even worse acceleration.
BTW, i just ordered a new fuel filter
I had an AWY in my 90 Golf NA and I consistently got 55-60mpg. It was a real screamer on the highway, but it was still efficient.
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There are a tremendous number of factors that can assist in producing poor fuel economy. Here is a non-exhaustive list: bad fuel, worn or improperly calibrated pump, improper pump or cam timing, old or improperly calibrated injectors, incorrect valve adjustment, improperly functioning hydraulic lifters, dirty air cleaner or other intake restriction, boost leak or pre-turbine exhaust leak on a TD, exhaust restriction, restriction in the fuel line, imbalanced or poor cylinder compression, worn accessory bearing such as alternator or a/c compressor, malfunctioning electrical system causing excessive drag on alternator, slipping clutch, improper transmission fluid or fluid level, worn or improperly lubed cv joints, worn or mis-adjusted wheel bearings, dragging brakes (which in turn can be caused by a variety of factors including but not limited to improper pedal freeplay adjustment, worn or corroded calipers, worn, dirty or corroded brake shoes, blockage in brake line, malfunctioning master or slave cylinder, malfunctioning brake booster), improperly balanced or improper tires, poor driving habits.
Andrew
you just described my N/A rabbit! minus the turbo! L.O.L.
i had a buddy make up a gage for the OUT bolt for a I.P. i can't wait to try it?
thanks Duane
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You forgot poor alignment :p
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increasing vehicle weight, roof racks, dino oil (debatable I'm sure), tire width, tire traction,worn steering components (resulting in bad/varying alignment), AC, PS, stereo setup, bad battery, driving with lights on (DRL can easily be disabled on mk2s), under inflated tires, warped rims, excessive idling,
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I have no back seat in the rabbit and i use it like a truck and i haul around about 700lbs. tools for my ironworker carrier! i'm like a boy scout gotta be prepaired! the last time i figured my milage when i went down to the state of Georgia to get my caddy with a tow dolly i averaged 25miles to a gallon!
I guess at that milage? naa!! i'll still drive the rabbit!!
Duane