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Veedubboy

Boost Check G60

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Done this today to double check boost integrity of a charger i was selling...though it might be handy to a few people. The boost levels can also be checked using a boost gauge function on the MFA (Corrado only). Use the following procedure: Start engine Move the MFA selector to "2" Press and hold the MFA end button (keep holding) Stop engine Start engine Release the MFA end button. Press the MFA End button one time. You should now see 550-750 readings fluctuating with idle. Anything higher than 750 is probably not right (a vacuum leak possibly?). Much less than 550 is probably too much timing advance. Run the car to the redline in 3rd and 4th gears noting the highest readings you get Running a standard 78mm pulley you should see 11psi if the charger is in good nick but a charger with a smaller pulley should make more than 11.6 EURO Hg(#'s of boost/vacuum) 200 - 23.7 400 - 17.8 600 - 11.9 800 - 5.9 1000 0 (Atmospheric pressure, charger is bypassed?) 1200 2.9 psi (You have a major boost leak) 1400 5.8 psi (Your charger is in very poor condition) 1600 8.7 psi (Your charger would benefit from new apex strips) 1800 11.6 psi (Good for stock pulley, needs new apex strips if 68mm pulley) 2000 14.5 psi (Good for 68mm pulley on stock charger) 2200 17.4 psi (Good for 68mm pulley on heavily ported charger) Any more than this and you must ensure that the fuelling is seriously up to scratch At this point you are into the realms of different injectors, aftermarket engine management and so forth. If you suspect a boost leak then examine all the intake pipe work very closely for damage. The soft rubber hoses leading to and from the intercooler are prone to splitting and the join between the two halves of the charger baffle box is also a problem area (silicon sealant or an RSR outlet should sort this out!).

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