Is this correct fuel pressure ?
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Is this correct fuel pressure ?
Running a MSD stage 3 sapphire 2WD.
Measured fuel pressure with gauge and it was 2,8-3 bar on idle when warm at approx 900-950 rpms.
With hose off fuel pressure regulator it was approx 3,5 bar.
When driving on the road the fuel pressure rose to approx 4,5 bar with 1 bar of boost pressure and just under 5 bar with 1,4-1,5 bar of boost pressure.
Is this correct ??
Cheers
Thomas
Measured fuel pressure with gauge and it was 2,8-3 bar on idle when warm at approx 900-950 rpms.
With hose off fuel pressure regulator it was approx 3,5 bar.
When driving on the road the fuel pressure rose to approx 4,5 bar with 1 bar of boost pressure and just under 5 bar with 1,4-1,5 bar of boost pressure.
Is this correct ??
Cheers
Thomas
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Also had the car at a MOT station today to get the Co level set and I'm quite surprised as to how hard that actually is to set properly.
Car is set @ 900-1000 rpm idle and all electronics are switched off.
It then read between 2,2 and 2,8% .... is it normal that the measure differs up and down like that ? ...and when the radiator fans kick in, it drops way down!
I was afraid it would run a bit lean since MSD says 2,5-2,7% so I adjusted the screw so that it measured between 2,7-3.2% instead. Rather have it run a little bit rich than risk anything, when an actual precise measure was so hard.
I guess a rolling road session with AFR measure is only way to make sure, that it doesn't run lean at higher RPMS and when on full boost.
Car is set @ 900-1000 rpm idle and all electronics are switched off.
It then read between 2,2 and 2,8% .... is it normal that the measure differs up and down like that ? ...and when the radiator fans kick in, it drops way down!
I was afraid it would run a bit lean since MSD says 2,5-2,7% so I adjusted the screw so that it measured between 2,7-3.2% instead. Rather have it run a little bit rich than risk anything, when an actual precise measure was so hard.
I guess a rolling road session with AFR measure is only way to make sure, that it doesn't run lean at higher RPMS and when on full boost.
Last edited by ThomasV; 12-07-2011 at 03:14 PM.
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Thanks James.
And by the way ... can't fault the MSD chip. It really works great. Car drives nice and smooth off boost and pulls even and amazing on boost. Couldn't ask for more.
Cheers!
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Now that we are on the subject ... I would actually like to know how the chip/ecu/fuel actually works.
The chip contains (among alot of other data) the fuelling information for the entire rev range and I am then able to adjust the fuelling a little bit by adjusting the Co screw clock/counter-clockwise, is this correct ?
In other words ... if I strap the car on rollers and it runs lean in the top-end of the rev range, it is down to the chip and not the Co screw adjustment ... correct ?
The chip contains (among alot of other data) the fuelling information for the entire rev range and I am then able to adjust the fuelling a little bit by adjusting the Co screw clock/counter-clockwise, is this correct ?
In other words ... if I strap the car on rollers and it runs lean in the top-end of the rev range, it is down to the chip and not the Co screw adjustment ... correct ?
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Thanks alot James. Appreciate it, mate!
Last edited by ThomasV; 13-07-2011 at 08:35 AM.
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