Fuel preassure on idle?
22 February 2003, 05:20 PM
#1
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Hiya lads!
I've just been in the garage and fitted the new fe td05 (big thanks to Mark) and one of them nifty malpassi fuel regs (adjustable 1:1 jobbie).
As the link doesn't seem to keep the pump running with just the ignition on (it runs it enough to kick preassure up, then it comes off) adjusting preassure at atmospheric becomes a tad difficult.
Well knowing it's a 1:1 reg, and it now idles around -0.5-0.6 bar (if I remember correctly), the 2.9 bar it runs fuel preassure right now should be around 3.5 bar at atmospheric, and .5 over standard.....right?
I'm a wee bit paranoid with fuel...
/J - I've got to sort an in car fuel preassure gauge....better get another Defi then...
I've just been in the garage and fitted the new fe td05 (big thanks to Mark) and one of them nifty malpassi fuel regs (adjustable 1:1 jobbie).
As the link doesn't seem to keep the pump running with just the ignition on (it runs it enough to kick preassure up, then it comes off) adjusting preassure at atmospheric becomes a tad difficult.
Well knowing it's a 1:1 reg, and it now idles around -0.5-0.6 bar (if I remember correctly), the 2.9 bar it runs fuel preassure right now should be around 3.5 bar at atmospheric, and .5 over standard.....right?
I'm a wee bit paranoid with fuel...
/J - I've got to sort an in car fuel preassure gauge....better get another Defi then...
22 February 2003, 05:28 PM
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One thing you can do is get a bolt on gauge for the pressure reg (£25) these bolt straight into the Reg.
Why can you not do atmospheric pressure?? just disconnect the vacumn pipe to the reg and adjust it whilst idling??
As long as the vacumn pipe is blocked whilst you do it there is no problem..
Rob
Why can you not do atmospheric pressure?? just disconnect the vacumn pipe to the reg and adjust it whilst idling??
As long as the vacumn pipe is blocked whilst you do it there is no problem..
Rob
22 February 2003, 05:45 PM
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fuel pressure at idle will be approx .5 bar below pressure at atmo.only way to check is to have a pressure gge inside the car to check it..pump shd pressurize the system when u turn igntion on..as a guide with uprated pump and regulator mine pressurizes at 2.4bar and idles at 3.2bar and is 3.6-3.7 at atmo the rate shld rise inline with boost pressure ie 1bar boost on mine fuel 4.6-4.7 bar
22 February 2003, 07:54 PM
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Rob - I have the gauge on the reg mate. 
The regulator uses the manifold preassure to keep the fuel preassure relative to...if you see what I mean.
So indeed, if the reg is set at 3 bar atmo, it'd show around 2.5 at idle (which runs at .5-ish bar of vaacum) - which IIRC is stock values.
My 2.9@idle seems to work well (been out tweaking the map), I think I could nudge it up a slight bit more even.
/j
The regulator uses the manifold preassure to keep the fuel preassure relative to...if you see what I mean.
So indeed, if the reg is set at 3 bar atmo, it'd show around 2.5 at idle (which runs at .5-ish bar of vaacum) - which IIRC is stock values.
My 2.9@idle seems to work well (been out tweaking the map), I think I could nudge it up a slight bit more even.
/j
23 February 2003, 03:05 AM
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Am i not right in saying then... remove the vacumn line from the Reg whilst adjusting teh pressure??
How can there be .5bar minus pressure if there is no vacumn to the reg..
Heres what i think...
Start car with vacumn disconnected from the reg, adjust the pressure to the required atmospheric pressure.. reconnect the vacumn pipe??
Am i being really thick here??
If there is no vacumn to the Reg then this is Atmospheric pressure, seems pretty obvious to me???
Rob
How can there be .5bar minus pressure if there is no vacumn to the reg..
Heres what i think...
Start car with vacumn disconnected from the reg, adjust the pressure to the required atmospheric pressure.. reconnect the vacumn pipe??
Am i being really thick here??
If there is no vacumn to the Reg then this is Atmospheric pressure, seems pretty obvious to me???
Rob
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23 February 2003, 05:04 PM
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Seriously now.. deffo not taking the p!ss would there be any problem with setting up the fuel pressure my way?? reason i ask is because my Fuel pressure is set this way and i am worried that it may be incorrect now...
Rob
Rob
24 February 2003, 06:41 AM
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2 bars? Heard it was enough for at least 300 atw in the U-know-which-country.
It's at 3.5 now, I'll nudge it up to 4 later (can't be arsed with a major remap at the moment).
/J
Heard it was enough for at least 300 atw in the U-know-which-country. It's at 3.5 now, I'll nudge it up to 4 later (can't be arsed with a major remap at the moment).
/J
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