injector pulse, fuel pressure and mpg calculation
#1
injector pulse, fuel pressure and mpg calculation
recently i installed a k04 kit, which requires the change to a 5bar fpr.
now obviously the trip computer calculation of mpg is wrong.
there is a way to enter a correction factor with vag-com apparently:
----
Control module 017
Selectct Adaption in Advanced Functions
Go to channel 03
Enter value (00085 would be 85% of normal)
----
first, has anyone computed what it would be for a 5bar fpr? i know wouldnt be +25% more fuel...that would be linear.
from <a href="http://www.rceng.com/technical.htm">Rc injector's</a> site they have a formula which may apply:
[(new pressure/old pressure)^1/2] X (old flow rate) = new flow rate
if i substitute:
4 in for (old pressure)
5 in for (new pressure)
1 in for old flow rate
i get 1.118 as the new flow rate.
or an 11.8% increase in fuel consumption.
i believe this the correct factor when just increasing the FPR on a stock 1.8t
feedback?
now obviously the trip computer calculation of mpg is wrong.
there is a way to enter a correction factor with vag-com apparently:
----
Control module 017
Selectct Adaption in Advanced Functions
Go to channel 03
Enter value (00085 would be 85% of normal)
----
first, has anyone computed what it would be for a 5bar fpr? i know wouldnt be +25% more fuel...that would be linear.
from <a href="http://www.rceng.com/technical.htm">Rc injector's</a> site they have a formula which may apply:
[(new pressure/old pressure)^1/2] X (old flow rate) = new flow rate
if i substitute:
4 in for (old pressure)
5 in for (new pressure)
1 in for old flow rate
i get 1.118 as the new flow rate.
or an 11.8% increase in fuel consumption.
i believe this the correct factor when just increasing the FPR on a stock 1.8t
feedback?
#4
Does this mean you would put in 88.2% with the vag?
Since the injector pulse has been lowered for the higher fuel pressure making the injectors put out a higher rate of fuel per ms.
#6
here's the original post by yippers...
quote:
<i>Too much optimism increase the value .... too pessimestic .. decrease ...</i>
so yes i believe, if you could, you'd put in 88.2%.
but since you can only do 5% increments, i think ill round it to 90%...and enter:
00090
into vag.<ul><li><a href="https://forums.audiworld.com/a4/msgs/2191752.phtml">original post</a></li></ul>
<i>Too much optimism increase the value .... too pessimestic .. decrease ...</i>
so yes i believe, if you could, you'd put in 88.2%.
but since you can only do 5% increments, i think ill round it to 90%...and enter:
00090
into vag.<ul><li><a href="https://forums.audiworld.com/a4/msgs/2191752.phtml">original post</a></li></ul>
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