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Improve performance by setting base boost
Posted by KeithG (more from KeithG) on Mon, 30 Sep 2002 16:58:26
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My 'new to me' 9k has been just one more example of a low base boost setting. The number of examples is at 7 and counting, that are set low after a number of years of wear/fatigue/heat cycles on the turbo/wastegate. It took 2 full turns of the wastegate rod to get it to the prescribed level of 6 psi. I have seen C900s at under 2 psi base boost and they would not attain 'end of yellow' until the base boost was set to the appropriate level. On my '95 9k (trionic 5), there was a boost waver at full throttle. The waver is still there (probably BCV), but it is reduced in amplitude and the lower end performance has been enhanced slightly. It is as if the system did not have to work as hard to maintain boost pressure. To set mine, I left the BCV connected to the wiring harness and used a plastic fitting to connect the C and W hoses. (nothing required on an LPT except running it as this is how the wastegate is connected on an LPT car) I used a 2" calibrated gage to set it at 6 psi. Loosen the wastegate lock nut and remove the clip when the car is cold as it is VERY tight behind the turbo. beyond that, just follow the APC FAQ or Townsend's information.
posted by 66.149.8...
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