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WOT is the CORRECT DYNO READING ??????????? 

 

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 Post subject: WOT is the CORRECT DYNO READING ???????????
Posted: Sun Aug 07, 2005 1:25 pm 
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hi

just thought i mite stir the pot a little here just to see WOT peoples thoughts are on engine dynamometers and chassis dynamometers

Its amazing how many dyno manufactures there are in the world :?: but yet talk to anyone of them manufactures and they all quote different engine drive tran losses

chassis dynamometers are a classic :idea: they all meassure rear wheel power and have there owm method of calculating back to flywheel power
they all have a different conversion factor :?: :?: :?: WHO IS RIGHT :!: :!:

Lets forget about the conversion factor for the momment thats another cettle of fish all together :cry:

the most common chassis dyno(s) in australia are DTS , mainline and dyno dynamics speak to all three of these manufactures and they all bag each other

Drive a same vehicle on each of these dynos you will get 3 different readings so who is correct and remember a base entry to buy anyone of of these chassis dynos starts at $500000 australian dollars and i failed to mention PLUS GST :shock:


cya

 

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Posted: Sun Aug 07, 2005 1:27 pm 
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dyno 1 + dyno 2 + dyno 3
______________________ = Correct Reading
3

 

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 Post subject: LOL
Posted: Sun Aug 07, 2005 1:43 pm 
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chunkz wrote:
dyno 1 + dyno 2 + dyno 3
______________________ = Correct Reading
3




LOL :wink: some how i dont think it works that way

LOL :idea:

cya

 

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Posted: Sun Aug 07, 2005 1:53 pm 
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I think it is more to do with operators tweaking the output than the dyno itself. Find an honest dyno and use it for all your tuning and it doesnt matter what all the others read.

 

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Posted: Sun Aug 07, 2005 1:55 pm 
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chunkz, all you get from that equation is the average of three values of unknown reliability/accuracy.

 

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Posted: Sun Aug 07, 2005 1:56 pm 
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chunkz wrote:
dyno 1 + dyno 2 + dyno 3
______________________ = Correct Reading
3


did you guess that or did someone tell you?

 

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Posted: Sun Aug 07, 2005 2:05 pm 
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with so many variations between dyno and conditions..

it is more than fair to say that they are not really much use for getting to much info from other than admitting they are a great tuning tool..

the diffence between X,Y and Z and then the other variations that need to be take into account..

Dyno readings mean squat at the end of the day..
the only way to tell it the smile on your dial the ¼ mile times or track times..

look at this series that is traveling round with a dyno dynamics dyno.. they take the same dyno to each event the same cars with the same specs have run on it and have shown variances of upto 35kw's.

liken that to say a torque wrench, that would be that the same wrench on any given day would be of different poundage to what it was the previous day.. but you don't know what that poundage is, was the correct poundage measured last time or this time..

in short and end of rant..

to much variance exsists between dyno's and manufactures to class dynos as anything more effective than a tuning tool.

 

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Posted: Sun Aug 07, 2005 7:06 pm 
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they are realy only a tunning toll to provide repeatable conditions

 

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Posted: Sun Aug 07, 2005 7:17 pm 
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chunkz wrote:
dyno 1 + dyno 2 + dyno 3
______________________ = Correct Reading
3



If you want to go down this road.... sumtimes this method is quite accurate (sometimes) to calculate how precise (not accurate :D) these readings are you calculate the uncertainty which is "(highest - lowest)/"how many readings". so basically the more times you test theoratically the uncertainty would be very low....

so you would then end up with something like this....

dyno 1 + dyno 2 + dyno 3
______________________ "plus or minus" Uncertainty = Correct Reading
3

P.S basically the uncertainty is the degree of how precise the data is,....
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Posted: Sun Aug 07, 2005 7:57 pm 
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eb six on boost wrote:
they are realy only a tunning toll to provide repeatable conditions


Good to see somone with an idea...

Dyno = tuning tool, NAUGHT MORE

 

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Posted: Sun Aug 07, 2005 11:31 pm 
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I must disagree with everyone here. I believe dynos are great sales tools.

If I decide to sell the wagon I will be heading back up to my mates at Croydons because they give great numbers and then I can have that as a selling point.

 

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 Post subject: LOL seems people mis-read the question
Posted: Mon Aug 08, 2005 2:08 am 
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dc_todd wrote:
with so many variations between dyno and conditions..

it is more than fair to say that they are not really much use for getting to much info from other than admitting they are a great tuning tool..

the diffence between X,Y and Z and then the other variations that need to be take into account..

Dyno readings mean squat at the end of the day..
the only way to tell it the smile on your dial the ¼ mile times or track times..

look at this series that is traveling round with a dyno dynamics dyno.. they take the same dyno to each event the same cars with the same specs have run on it and have shown variances of upto 35kw's.

liken that to say a torque wrench, that would be that the same wrench on any given day would be of different poundage to what it was the previous day.. but you don't know what that poundage is, was the correct poundage measured last time or this time..

in short and end of rant..

to much variance exsists between dyno's and manufactures to class dynos as anything more effective than a tuning tool.


hi

question :?:

if i purchase a 24 carrot gold ring for $50000 + gst whot i expect to get for my money ? :wink:

answer

a . 9 carrot ring
b . 14 carrot ring
c . 19 carrot ring
d . 24 carrot ring

phone a friend
ask the audince
50 / 50

we all know a chassis dyno is a great tuning tool but that wasnt my question i ask in the first posting :wink: :idea:

 

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Posted: Mon Aug 08, 2005 12:35 pm 
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USELESS wrote:
I must disagree with everyone here. I believe dynos are great sales tools.

If I decide to sell the wagon I will be heading back up to my mates at Croydons because they give great numbers and then I can have that as a selling point.


and how many buyers really give a rats a*** about dyno results,,they just want to know if it runs and how quick it gets to 100k's,,and to most people dyno results can be bodgied to suit the occasion,,,there just a tuning tool and thats it

 

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 Post subject: PMSFL pay peanuts u get monkeys
Posted: Mon Aug 08, 2005 12:53 pm 
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pepsimax wrote:
USELESS wrote:
I must disagree with everyone here. I believe dynos are great sales tools.

If I decide to sell the wagon I will be heading back up to my mates at Croydons because they give great numbers and then I can have that as a selling point.


and how many buyers really give a rats a*** about dyno results,,they just want to know if it runs and how quick it gets to 100k's,,and to most people dyno results can be bodgied to suit the occasion,,,there just a tuning tool and thats it


LOL

again u missed the question

im certainly interested and remember we are not talking peanuts we are talking alot of money

wander if you where on life support system would ur attitude be who cares if the heart monitor is reading 98 beats per minute or if its reading 128 beats per minute

remember its a technical peice of equipment( chassis dyno ) and people are paying extremely high prices for that test equipment so for my money i would want to know why they all read different :idea: :wink: IS THERE A STANDARD THAT THE DYNOS HAVE TO MEET :!: :!: :!:

cya

 

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Posted: Mon Aug 08, 2005 1:15 pm 
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as i said,,and i'm not replying to your original post just what useless wrote,,how many buyers really give a toss about dyno results,,to most people there s**t.

 

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