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#15
by
moTthediesel
on 20 Mar, 2006 22:25
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Over 65mph and the drag is going up out of all proportion to the reduction in journey time, our limits are 60 and 70 here, A road and M road respectively, about right, 80 mph and she drinks fuel - Fact!
Speaking of the relationship of speed and fuel consumption, here are some results of a test done on a Porsche 356. This was done by a 356 Registry member with access to some high tech gizmos. (and maybe too much time on his hands)
First, a data recorder was hooked to the accelerator pedal to record throttle position. Then the car was driven back and forth over a flat and level section of highway at speeds of 45, 60, 70, and 80 mph. Then the car was then mounted on a dyno and run at the same throttle settings that were recorded from the two way passes.
The results:
45 mph: Too small to be replicable on the dyno
60 mph: 6.2hp!
70 mph: 12.8hp
80 mph: 29.2hp
At the risk of sounding like a greenie-weenie, it's easy to see why just slowing down is the easiest way to save fuel :roll:
Parasitic drag is bee-atch :x
moT
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#16
by
gunny
on 20 Mar, 2006 23:37
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Yep, know exactly what you mean, I drive my '86 diesel golf 104 miles round trip to work every day and only average like 40 mpg, at 70mph, but driving back and forth to my moms on the weekends on the back roads at around 45 to 55mph and I get closer to 47mpg.
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#17
by
Hey
on 21 Mar, 2006 15:04
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speedball30... keep us up to date. I'd really like to see what will make the greatest difference.
I bet it will be:
1)injectors
2)cat
3)tires
If I were you, I would put the timing donw to 1mm. 1.15mm seems a bit high! Each burning cycle produces less torque if timing is too soon in the piston movement.
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#18
by
speedball30
on 25 Mar, 2006 13:57
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They told me the pump stroke could not be adjusted on my car....I'm gonna get my injectors to SMOG ASAP.
As for the cat, can I just cut the bottom off it and remove the inards and put it back together? Or is it simpler/better to cut it out and replace with a new section of pipe?
Thanks for the help
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#19
by
tylernt
on 25 Mar, 2006 15:44
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As for the cat, can I just cut the bottom off it and remove the inards and put it back together?
You can remove the cat by disconnecting the pipe unions in front of it and behind it, then smash out the catalyst with a metal rod and a hammer. This is assuming it's legal for you to do that in your state/municipality, of course. :wink:
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#20
by
wyldman
on 25 Mar, 2006 18:33
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Removing or gutting the cat is illegal.If you do remove it,it will fail the visual inspection part (they check for the cat) of the Ontario Drive Clean emission testing here.
If you gut it,you should weld a pipe through it,as it will resonate and make it sound funny if you don't.A good technician will hear this,and may fail it due to suspecting a failed or removed catalyst substrate.
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#21
by
okron1k
on 26 Mar, 2006 00:30
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normally my first quarter of a full tank takes me to 200 km's. this tank i tried something different. right now im at about 330km's and im at a quarter
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#22
by
tmaybee
on 26 Mar, 2006 17:28
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normally my first quarter of a full tank takes me to 200 km's. this tank i tried something different. right now im at about 330km's and im at a quarter
What did you try that made such a difference :?: :?: :?:
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#23
by
jtanguay
on 27 Mar, 2006 03:59
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normally my first quarter of a full tank takes me to 200 km's. this tank i tried something different. right now im at about 330km's and im at a quarter
What did you try that made such a difference :?: :?: :?:
let me guess. you did not mash the 'diesel' pedal as much? :lol:
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#24
by
ricosuave
on 29 Mar, 2006 20:13
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normally my first quarter of a full tank takes me to 200 km's. this tank i tried something different. right now im at about 330km's and im at a quarter
cmon, did you do the vent trick to get every drop in there and drive like a nancy to get 330 at 1/4 tank? if you were to reasonably get 250 for each 1/4, that means 1000 per tank. on a 1.9 idi jetta, i would very much doubt that. so, i call bs on the 330km on 1/4 tank unless you can back it up with some info.
not trying to rain on your parade, but, this forum does not need unrealistic information like that floating around, imho.
rico
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#25
by
wyldman
on 29 Mar, 2006 20:26
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A well tuned Jetta 1.9L TD will get over 1000 KM per tank if you baby it.I've done it a few times.
I've never gotten anywhere near 330 km out of the first 1/4 tank.My MKII Jetta gas gauge is like that (thens it goes down much quicker from 3/4 on down),but the MKIII's seem to get 250 KM or so out of the first 1/4 tank.
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#26
by
ricosuave
on 30 Mar, 2006 19:10
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well, shut my mouth.
i didnt believe it.
my best was 950
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#27
by
chrissev
on 31 Mar, 2006 05:16
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Removing or gutting the cat is illegal.If you do remove it,it will fail the visual inspection part (they check for the cat) of the Ontario Drive Clean emission testing here.
If you gut it,you should weld a pipe through it,as it will resonate and make it sound funny if you don't.A good technician will hear this,and may fail it due to suspecting a failed or removed catalyst substrate.
as far as I can remember from having my diesel jetta drive clean inspected, all they ever did was stand behind the car and do a visual smoke-test. They never checked for a catalytic or hooked any testing equipment up to the exhaust. My jetta didn't have a cat on it.
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#28
by
wyldman
on 31 Mar, 2006 06:31
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Your Jetta never came factory equipped with a cat,so there is no need to look for one.
The A3's have a sticker under the hood marked "CATALYST",so they should be looking for one.If the technician knows his stuff,he should also know most newer VW diesels have them,and he should check for it.
Some places are just lazy,and just start the car and look for smoke,they don't do the correct visual inspection to verify the other emission equipment is intact.Rewiring of the low speed advance control (if noticed),is also an emission violation,and they can fail it if they realize it.Best to make you mods clean and neat,so they look factory.They will never figure it out then.