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quattrorunner quattrorunner is offline
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Join Date: May 2006
Location: Las vegas
Posts: 5,728
Garage
Fuel pressures and afr

So I gut a leask worm up regulator and wanted to instal it. Got me a set of fuel pressure tools that I could use to make the adjustments.
My system has one fuel pump, and it's an 044 Bosch up front (911vin car)
First of all, my afrs for my current wur are as follows:
Idle. 12.1
3krpm 15.5
Slight load up a hill. 15.7
Full boost. 11.1
And these are approximate.
Then I installed the adjustable wur and attached the gauges to check pressures.
My system was in spec at 87 psi. And my control ales was I. Spec at first but then I felt like my Chinese gauge set went south and no longer gave good readings so my made sense. It looked at first like my wur wasn't heating but I had voltage to the plug. No change in control pressure with time. Bad gauges maybe.
So screw the adjustment part. I'll just use the wur as us but the adjustments were very similar to my old one. Only real change was full boost dipped way rich inti the 9's which my car just cut out.

Why does everyone else have better afr's during cruise and idle than me?
I get high EGT numbers at slight load like going up a hill or sustained 90mph driving (1550*) because my afr is super lean when driving like that. Dangerous.
Thanks.
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Old 03-06-2014, 07:21 AM
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