Many variables can affect the boost pressure and the reading on your boost gauge. In fact your boost gauge can even be incorrect. Our advertised approximate boost levels are taken at sea level, full throttle and at the peak rpm or redline. Operating your vehicle at a higher altitude will lower your boost. Vacuum hoses that are shot can leak 30-50% of your boost. We suggest replacing all vacuum hoses with new OEM cloth woven hose material in the correct size. We also highly recommend that all vacuum hose connections use a hose clamp or at least a zip tie. A worn engine or leaking valves can lower the boost. Incorrect cam timing or a highly ported head can lower the boost. A 1.8L engine is about 10% smaller than a 2.0L engine and you will see about 10% less boost. Then of course you can also have a boost leak in your boost systems tubes or intercooler. You can also have drive belt slippage. If you own a G60 car replace your spring tensioner and install our billet tensioner cap. The ideal tension will compress the tensioner springs until there is about one coil width between the coils. Lysholm type screw compressors utilize a metal housing and metal internal screws to produce boost. If the compressor is up and operating it can only make its full boost potential. If the charger looses oil or a bearing fails it will stop turning altogether. Yes, finding boost leaks and diagnosing a low boost condition can be very time consuming and frustrating, the best of luck.
tel:
541.388.1202