ModifiedA4

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)
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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?

a_o_smith

...i think 1.118 as a percent it 111.8% (which doesnt sound right to me)

Audi2ptzero

so that means there is a .118 gain or 11.8%.

Audi2ptzero

Since the injector pulse has been lowered for the higher fuel pressure making the injectors put out a higher rate of fuel per ms.

DAP@EPL

FYI, the correction only allows a range from 85% to 115% in increments of 5%.

ModifiedA4

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>

ModifiedA4

yup...exactly what im thinking...not sure if its right...but it seems reasonable.

ModifiedA4

correct...according to yippers.

a_o_smith

youre right...dumb moment

ModifiedA4

happens to everyone