[Vwdiesel] accuracy of speedo/odometer/avg fuel economy and other tidbits
lbaird119 at aol.com
lbaird119 at aol.com
Thu Sep 24 23:01:07 PDT 2015
I've yet to find a (post A1) VS speedo that is closer than 2-3 mph. I have and drive several cars and trucks. The Nissan Frontier is the ONLY one that is accurate. Dad's Dodge became so after a tire size change and a computer re-flash. My Work van was off about 5 mph WITH a correction box already in it. The '83 was so far off it was ridiculous! I had to have a cheat card by the radio, similar to what Doyt did. The Passats are off by about 3 mph but odo is correct. Golf is off a bit more. I think the 914 was good. The older cars were. If not, I re geared them until they were good (van and Mustang).
I was wondering how the car could know it was being sniffed compared to repaired but apparently it's the dyno testing that it was fooling with. Ingenuity. I wonder how much difference some NOx really makes. It wasn't that long ago that it wasn't tested on diesels then greenie gassers whined that it wasn't fair! Then came EGR for diesels since they determined you couldn't decrease the compression enough on a compression ignition engine!
I wonder how much more emissions 9or less) the cars will emit when compliant compared to not. although it may test higher at the moment or NOx is higher, I tend to wonder about the overall life of the car emissions. It could potentially be lower due to less wear, better running, etc Other emissions like particles, could easily be less.
I'm not instantly furious like the green gasser crowd that now a few, drive diesels. :-D
Loren
-----Original Message-----
From: Hayden Chasteen <dieseltdi at verizon.net>
To: vw fans <vwdiesel at vwfans.com>
Cc: VW TDI Mail List <vw-tdi at yahoogroups.com>
Sent: Thu, Sep 24, 2015 8:25 am
Subject: [Vwdiesel] accuracy of speedo/odometer/avg fuel economy and other tidbits
Ever since I purchased my 2015 Jetta TDI, I have puzzled over the apparent
inaccuracy of the speedo/odometer and especially the AVG MPG display. Unlike my
Grand Cherokee Ecodiesel, which is extremely accurate (by road test, GPS and
math calculations) the Jetta is about 9.2% off. Speedo over estimates speed by
3-5 mph. Odometer has about the same error and the avg MPG is also overstated
by the same 9+%. So finally, I made an appointment to take the car to the
dealer. I spoke today with the head tech and explained my concerns. His
response was very interesting: “If you want an accurate speedo and the other
things, buy a Phaeton or a CC!” He said that the accuracy will change as the
tires wear and “everything will average out”. He said VW aims for accuracy at ½
tire wear! Point is, don’t assume your gauges are correct, particularly the AVG
MPG. I also asked about the recall and we all couldn’t understand why the
2015/16 cars were included in the holdback/recall since they have a completely
different engine, emissions system and software from the previous models
(09-14). Their response was “you know as much as we do right now! We are
getting our information from the news also.” Just thought this was important
enough to pass along. Hayden
"God is not a diviner being or a magician, but
the creator who brought everything to life. Evolution in nature is not
inconsistent with the notion of creation, because evolution requires the
creation of things that evolve.” Pope Pius XII
“There are many men of principle
in both parties in America, but there is no party of principle.”
“I do not know
if the people of the United States would vote for superior men if they ran for
office, but there can be no doubt that such men do not run."
“I cannot help
fearing that men may reach a point where they look on every new theory as a
danger, every innovation as a toilsome trouble, every social advance as a first
step toward revolution, and that they may absolutely refuse to move at all.”
Alexis de Tocqueville
Proud owner of:
2014 Jeep Grand Cherokee Ecodiesel
1968
Beetle
2015 Jetta SE TDI
And many, many, many VWs; from a 1947 Beetle (13
Beetles total), to Vans (5 - 3 splitties 2 bay window (both were campers), 1
Vanagon Westy, Rabbits (3), Karmen Ghia (1), Jettas (11), Passats (2), Dasher
(1), New Beetle (1), Rabbit Convertible (1) and Rabbit Pickups (3) most now gone
but not forgotten.
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