webmaster Posted December 13, 2008 Report Share Posted December 13, 2008 MEASURING BOOST PRESSURE This measurement requires the following road test conditions Engine at normal operating temp (make sure oil is warm along with coolant) In 3rd gear, hold the car between 1500rpm and 2000rpm Floor the accelerator pedal Monitor the boost pressure between 3000 and 4000rpm, note the pressure, and compare to the chart below (the factory manual calls for measurement at 3k rpm which is too low for old turbo charging units IMO) N9T: 610 +/- 40 mbar (8.8 +/- 0.6 psi) N9TE: 620 +/- 40 mbar (9 +/- 0.6 psi) N9TEA: 780 +/- 20mbar (11.3 +/- 0.3 psi) N9TEA - CHECKING OPERATION Disconnect the connector from the electro valve Install boost pressure test gauge Perform test (same test above for checking boost pressure) Record values obtained as P1 (manual says ~0.5bar or ~7.25psi) Reconnect the electrovalve connector Perform test for boost pressure again Record new values obtained as P2 (manual says ~0.8bar or ~11.6psi) --> If P2 > P1 -- boost monitoring is correct --> if P2 is the same as P1 -- boost pressure monitoring is incorrect If boost pressure monitoring is incorrect, check: Check continuity of wires 2 and 2D Check diode (wires 2A - 2C) between pins 1 and 2 of electrovalve Check the hoses and circuit taps within the hose routing for: dirt, oil build up, ice at the restrictors Scans of these pages in the manual will be attached shortly.... Quote Link to comment Share on other sites More sharing options...
webmaster Posted December 16, 2008 Author Report Share Posted December 16, 2008 Quote Link to comment Share on other sites More sharing options...
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