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Instantaneous Fuel Flow Gauge 

 

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 Post subject: Instantaneous Fuel Flow Gauge
Posted: Tue Aug 08, 2006 2:58 pm 
Oompa Loompa
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Age: 32

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Ride: AUIII XR6 VCT ST

Power: 137 rwkw

Location: Sydney
NSW, Australia

If there is another forum addressing this could someone point it out because i can't find anything so far...

I'm looking to create an instantaneous fuel flow gauge for my AUIII XR6. I don't want one of those 5 sec increment one's that come with trip computers cause i reckon they're crap. Has anyone made one for their car?

Otherwise, I'm happy to sit down and make one and write up a doco for it. In that case, does anyone know anywhere that sells fuel flow rate or fuel pressure gauges/meters?

 

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Posted: Tue Aug 08, 2006 5:55 pm 
Getting Side Ways
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most decent gauge makers have fuel pressure guages

an issue i see with your idea of a fuel flow meter is you'd need one on the return line as well so you'd get an accurate figure

 

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Posted: Tue Aug 08, 2006 7:25 pm 
Oompa Loompa
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Ride: AUIII XR6 VCT ST

Power: 137 rwkw

Location: Sydney
NSW, Australia

thats right. the only way to do it accurately is to run either flow rate or pressure (easy to work out flow rate from pressure) on either side of the fuel rail and the difference between the two is the fuel usage. i can use some of the electronics stuff i'm learning at uni to make a circuit to make it work.

 

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14.904 @ 92.1mph

Shhh. Nothing is impossible. Just needs more development time!

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Posted: Tue Aug 08, 2006 10:42 pm 
Getting Side Ways
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Age: 36

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Ride: 1994 ED XR8 Sprint

Location: Somewhere in
QLD, Australia

i'd like to know how you're gonna figure out the flow rate given the pressure differential given that you've got a fuel pump forcing fuel at a high pressure towards injectors and a regulator, and virtually no pressure in the return line as there is no restriction

you really need 2 inline flowmeters to figure it out

more to the point, why do you want to know how much fuel you're using at any given time? without going into some fancy programming, the best you'll be able to figure out is litres per minute/hour, which isnt really usefull

 

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Posted: Tue Aug 08, 2006 11:04 pm 
Oompa Loompa
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Ride: AUIII XR6 VCT ST

Power: 137 rwkw

Location: Sydney
NSW, Australia

you can work a lot of this out using fluid mechanics theory. i just did 6 monts of pipe flow theory at uni so that won't be a problem.

as for my motivation, just something i always want to do. what unit i choose to use for measurements doesn't really matter. the setup that i'll end up doing will really depend upon what works best in terms of hardware. there won't be any need for any software or cpu processing.

 

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137.1rwkW
14.904 @ 92.1mph

Shhh. Nothing is impossible. Just needs more development time!

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Posted: Tue Aug 08, 2006 11:19 pm 
Getting Side Ways
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Ride: 1994 ED XR8 Sprint

Location: Somewhere in
QLD, Australia

using your theory, whats the airflow in a compressor tank at a pressure of 100PSI and an outside air pressure at sea level?

 

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Posted: Thu Aug 10, 2006 6:17 pm 
Oompa Loompa
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Age: 32

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Ride: AUIII XR6 VCT ST

Power: 137 rwkw

Location: Sydney
NSW, Australia

considering that its a tank, which is sealed, the net mass flow rate is zero. What's your point?

 

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14.904 @ 92.1mph

Shhh. Nothing is impossible. Just needs more development time!

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