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Old April 13th, 2004, 12:27 AM   #1
 
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1999 AV6 Analysis

This thread is about the analysis of my 99 AV6 with my Auterra Dyno-Scan. This is the site for it http://www.auterraweb.com/index.html and this is what I am using it on http://www.v6performance.net/forums/...threadid=20711 .

As time goes on I will post up info I collect from using this including Dynamometer tests.

First Analysis

Speed test (highway):

80 MPH gauge reading = 75 MPH OBD II reading
85 MPH gauge reading = 80 MPH OBD II reading
90 MPH gauge reading = 84 MPH OBD II reading

80 and 85 MPH are only off by 5 MPH from the actual reading but 90 MPH is off by 6. The OBD II scanner gets the speed info right from the ECU so as long as the tires are at the right pressure (OEM size rims/tires) you will get very accurate readings. I havenít had time to do any other speed tests so I am not sure how off the gauges are at lower speeds.

More to come soon .



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Old April 13th, 2004, 12:35 AM   #2
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we know this already chris
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Old April 13th, 2004, 12:44 AM   #3
 
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Quote:
Originally posted by abram2001 on April 13th, 2004 at 01:35 AM

we know this already chris
Yeah I know that we all know the gauges are off. But we don't really know the exact numbers at certain speeds .



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Old April 23rd, 2004, 03:22 AM   #4
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Have you done any dyno runs with your scanner yet? I can't wait to see your results.
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Old April 23rd, 2004, 03:25 AM   #5
 
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Originally posted by TH23 on April 23rd, 2004 at 05:22 AM

Have you done any dyno runs with your scanner yet? I can't wait to see your results.
Not yet, I might do some this coming week .



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Old April 23rd, 2004, 03:36 AM   #6
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Cool I really wish I could afford a PDA and OBD-II scanner, it sounds like it's pretty fun to use.
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Old April 30th, 2004, 01:51 AM   #7
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cool information. You thinking getting HUD[heads up display] from Defi would help this problem?

Those are electronic speed readers.. i believe.
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Old April 30th, 2004, 02:00 AM   #8
 
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Originally posted by HwaNi.J30A-C on April 30th, 2004 at 03:51 AM

cool information. You thinking getting HUD[heads up display] from Defi would help this problem?

Those are electronic speed readers.. i believe.
It's possible. The gauge cluster is what is off most of the time, not the speed sensor. But the speed sensor can be off if you have a tire and wheel combo that are not the same diameter as stock and/or low tire tread.



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Old May 12th, 2004, 03:26 PM   #9
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Can you do a top speed run to like 130 MPH, and then report back to us?
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Old June 1st, 2004, 07:15 PM   #10
 
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I did this last week but forgot to post it .

Using my GPS I got this from it on the same stretch of highway:

Accuracy between 6.4-7.7 feet

65 MPH gauge reading - 62.8 MPH GPS
70 MPH gauge reading - 66.3 MPH GPS (+5 MPH from 65 = +3.5 MPH GPS)
75 MPH gauge reading - 71.4 MPH GPS (+5 MPH from 70 = +5.1 MPH GPS)
80 MPH gauge reading - 76.4 MPH GPS (+5 MPH from 75 = +5 MPH GPS)
85 MPH gauge reading - 81.2 MPH GPS (+5 MPH from 80 = +4.8 MPH GPS)
90 MPH gauge reading - 85.2 MPH GPS (+5 MPH from 85 = +4 MPH GPS)

All GPS speeds are an average over a few minutes of driving for each speed reading. Most of the time it only was only a different of +/- .3 MPH. The accuracy between the gauge and actual speed peak at 80 MPH but then start dropping after that. This drop also shows up in the OBD II readings. I'll have a bit more on this soon.

Quote:
Originally posted by Lxcord on May 12th, 2004 at 05:26 PM

Can you do a top speed run to like 130 MPH, and then report back to us?
Sorry, don't feel like doing that right now .



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Old June 3rd, 2004, 09:45 PM   #11
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Plum you sir are a Wussy
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Old June 4th, 2004, 12:02 AM   #12
 
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Originally posted by Lxcord on June 3rd, 2004 at 11:45 PM

Plum you sir are a Wussy
You go buy one and do it yourself then . And I have maxed out my car before (it was a long time ago), check my sig link above.



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Old June 19th, 2004, 09:22 PM   #13
 
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hey chris,
just outa curiosity, could you do the same thing at lower speeds?
ie 30-35-40-45 up to 70ish?

i was doin a road trip today w/ my gps, and i found my 65-80 ranger is closer to accurate, than my 30-55 range
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Old June 20th, 2004, 12:18 AM   #14
 
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Quote:
Originally posted by davejax904 on June 19th, 2004 at 11:22 PM

hey chris,
just outa curiosity, could you do the same thing at lower speeds?
ie 30-35-40-45 up to 70ish?
I might do it at lower speeds sometime this week. Stay tuned .



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Old July 14th, 2004, 11:24 AM   #15
 
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hey is it safe to assume the same for all years. or is the difference varied with the new igntion?
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Old July 14th, 2004, 01:32 PM   #16
 
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Originally Posted by snikwad
hey is it safe to assume the same for all years. or is the difference varied with the new igntion?
6th gen and 7th gen AV6 or just all model year 6th gen AV6's?

At this point I think all 6th gen AV6 gauges suffer from the same inaccuracies.



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Old July 14th, 2004, 01:34 PM   #17
 
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6th gens.
i know all manufactorers do this deliberately, i read somewhere that its required by law for them to make speedos show optimistic readings.
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Old December 9th, 2004, 04:38 AM   #18
 
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This thread completely slipped my mind until yesterday, sorry . So I went out last night to a deserted area and did some low speed testing. Only did 5-50 MPH, forgot 55 and 60 MPH .

GPS Accuracy - between 6.2-8.9 feet

5 MPH gauge reading - 6.7 MPH GPS
10 MPH gauge reading - 9.1 MPH GPS (+5 MPH from 5 = +2.4 MPH GPS)
15 MPH gauge reading - 13.9 MPH GPS (+5 MPH from 10 = +4.8 MPH GPS)
20 MPH gauge reading - 18.6 MPH GPS (+5 MPH from 15 = +4.7 MPH GPS)
25 MPH gauge reading - 23.8 MPH GPS (+5 MPH from 20 = +5.2 MPH GPS)
30 MPH gauge reading - 28.1 MPH GPS (+5 MPH from 25 = +4.3 MPH GPS)
35 MPH gauge reading - 33.6 MPH GPS (+5 MPH from 30 = +5.5 MPH GPS)
40 MPH gauge reading - 37.8 MPH GPS (+5 MPH from 35 = +4.2 MPH GPS)
45 MPH gauge reading - 42.6 MPH GPS (+5 MPH from 40 = +4.8 MPH GPS)
50 MPH gauge reading - 47.4 MPH GPS (+5 MPH from 45 = +4.8 MPH GPS)

Again, all GPS speeds are an average over a few minutes of driving for each speed reading. Most of the time it only was only a different of +/- .4 MPH for each reading. Low speed testing isn't easy to do since cruise control won't work under 25 MPH. It would be great to have someone make up a list like this with there GPS reading so we can compare them .

More info soon. But this time, a lot sooner than 5 months .



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Old December 18th, 2004, 11:10 PM   #19
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Now what is CAN? Bc I see you can get it with or without CAN? What cars use that?
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Old December 19th, 2004, 12:44 AM   #20
 
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Originally Posted by DeadDoc
Now what is CAN? Bc I see you can get it with or without CAN? What cars use that?
CAN is a new type of diagnostic communication. Right now it's on select 2003, 2004 and 2005 car models. By 2008, all cars sold in the US must use CAN. I suggest buying the one with CAN so that you're set for the future.

http://www.auterraweb.com/aboutcan.html

What's messed up is that they aren't selling the CAN adapter separately. Do they expect customers that already bought the first kit to buy another $289 kit just for CAN support ?



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Old May 3rd, 2005, 10:25 AM   #21
 
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Originally Posted by Plumaccordcoupe
More info soon. But this time, a lot sooner than 5 months .
*Looks at calendar* haha

I've had all of the collected data since January, just haven't found the time to look through all of it. I'll try to make some extra time for this soon though.



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Old May 3rd, 2005, 10:35 AM   #22
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you stink
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Old May 5th, 2005, 10:35 AM   #23
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I want to see one of those top speed readings.



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