[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
On 30 Nov 2003 at 20:13, Jim Adney wrote: > On 30 Nov 2003 at 20:13, David V.N. wrote: > > > Naive?No.Optimistic?Probably.Looking forward to doing it?Definately! > > I tend to be pessimestic about things like this, but I tend to believe that > this is because I think I understand them better than most. Of course I may be > wrong on both counts, but see below.... > > > It won't waste anything if used to feed a larger displacement (if you're > > refering to higher fuel pressure=max is 34 or 36psi,I think.)Either way an > > exhaust analyxer is in order,Can you suggest a source? > > The PS measures the pressure DROP across the inlet. It uses that to indicate > the amount of airflow. At low throttle and RPM this will be just fine with a > large engine; air is air and a measured amount will get a measured amount of > fuel. At some point the PS will max out, however, and then there will be no > additional fuel as the airflow continues to increase. So you are lean. > > If you try to cure this by just increasing the fuel pressure you can make > things work right at some point, but the mixture at 36psi will be 20% rich and > the PS will still be maxed out. Sorry this was garbled. Try this: If you try to cure this by just increasing the fuel pressure, you can make things work right at some single point, but the mixture at 36psi will be 20% rich across the board at low throttle and RPM, and the PS will still be maxed out at high air flow conditions (open throttle and higher RPMs.) -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org