Funky Boost Curve

[robboxr6t]

hi guys, ive done a search, just wondering why my boost curve isnt consistent, and what could I do to remediate the situation?

thanks..

Edited 16/01/06 08:13 AM by robboxr6t

[Blonk]

Your actuator sux............

[robboxr6t]

its a brand new garret one and my tuner tried another one today and same result.

Edited 16/01/06 08:23 AM by robboxr6t

[Blonk]

Why did you remove the stock one??

And have you replace the solenoid??

[Robit28]

I may be wrong, but would say that's normal. The T's boost is controlled by a solenoid that bleeds the air. Once the required boost is reached, the actuator arm opens to let exhaust out which in turn drops the boost. The computer sees the drop in boost, shuts the actuator and the boost rises again. Then the cycle begins again, this all hapens fairly fast and that's what your seeing on the dyno graph.

Rob.

[robboxr6t]

c and v told me it needed replacing cause it made this problem a while ago and also it made a clicking noise like a compresser when idling. now that I have had this replaced it still made the same problem so they told me to replace th cat so I did, and still the same bull sh$#

[rob82]

I would say 8psi acuator and a friday afternoon tune!!!

[Blonk]

Not very clear

Did they replace the actuator or the solenoid????

[rob82]

Elaborating I would say that's its going in and out of closed loop boost control, they probably have set the open/closed loop bounds large enough or not tuned the desired table correctly.

[Blonk]

I would say they have replaced the solenoid and not the actuator....

The wastegate is held shut by a spring, when the correct boost is achieved the solenoid opens allowing a vacuum to pull the actuator open which then pulls the wastegate open, The vacuum is drawn from the intake side of the compressor.

If the spring on the wastegate is cactus it will not remain closed even if the solenoid is shut..