Okee dokee David. I'll let it be for now :) Mind you, I have a mate for that gauge somewhere, if I can find it I'll compare the gauges. cheers alistair
On 2013-07-24, at 9:37 AM, David Beierl wrote: > At 12:03 PM 7/24/2013, Alistair Bell wrote: >> Well, it is a USG (US Gauge) pressure gauge. You can't be doubting those readings can you? > > You'd be amazed at my ability to doubt gauges. I've got a lovely little chromed-brass vacuum gauge made by USG for Gomco, the (at one time anyway) pre-eminent maker of medical suction devices. It's pretty, readable, responsive, and irritatingly far off. > >> Yup, Bentley gives value in Bar and psi. 2.5 Bar = 36.25 psi. Leaving aside gauge error, I was just wondering if the extra 2psi would be enough to enrichen things beyond the O2 sensor's control ability. > > Hollow laughter, since the ECU has the demonstrated ability to follow a shorted sender down into super-rich will-barely-idle hell. But remember that the system should operate (except for emissions) perfectly with sensor and CAT removed. My California-spec '84 was delivered that way in Germany and didn't get its CAT and lambda sensor until it arrived in the US in 1991. > > So lessee...stoichiometric mixture is 14.7:1. Best economy mixture is about 16.7:1, best power mixture is about 13.3:1. If the system is aiming for stoich at 2.5 bar, 38 psi will bring it rich by 4%, to about 14:1. I don't think you have a worry. And of course the feedback system will get its sticky fingers in there, mis-read the misfiring cylinder as lean and screw your mixture up completely. > > Yours, > David |
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