Stock Tune With Larger Dump

[Buf-Phoon]

that's it right there.Mechanic V DIY V a qualified and experienced tuner.

Why risk it

[ETM]

hey trevs that is your best bet, just keep off the throttle especially up oozley

[trevs]

I agree driving off boost isnt that hard but I was thinking just in case it wouldnt hurt to disconnect it for a fail safe method that's if doing that would work

ill test the boost solenoid tomorrow in my lunch break and see if its normally closed like I think it would be

trev

[ETM]

if not bypass the solenoid all together with a new line direct from turbo to the wastegate

[senna_T]

Yes it is normally closed mate, the wastegate regulates the boost by opening to bypass exhaust gas out of the exhaust housing, keeping it shut would mean the turbo would continually build boost

someone may correct me if I'm wrong

[ETM]

He is talking about the solenoid valve though not the actual wastegate valve. It may be either but I suspect as a safety measure it would be to set it normally open as if the electrical signal was to fail it would cause a massive spike if it was normally closed.

[trevs]

thanks for the help mate im sure either way it could be made to work to stop boost from building

the reason I was thinking nc was because about a year ago the hose fell off the bottom of mine and the car over boosted all the time untill I realised and put it back on

cheers trev

Edited 06/07/09 11:09 AM by Buf-Phoon

[ETM]

Yeah if the hose falls off that replicates a normally closed valve with no electrical signal so it will overboost badly.

[trevs]

  ETM said:

Yeah if the hose falls off that replicates a normally closed valve with no electrical signal so it will overboost badly.

cool in that case your idea to bypass the solenoid all together with a new line direct from turbo to the wastegate will work a treat

cheers trev

[Redback]

I have checked this myself. The ECU supplies power to the solonoid keeping it shut to build up boost, when it releases the voltage the solonoid opens allowing boost pressure to hit the actuator and open the gate. Hence, if you unplug the solonoid it's essentially the same as runny a hose directly from the turbo comp housing to the actuator. Get yourself a boost guage and check it. If it's only spiking by about a pound or two I wouldn't stress because the factory parameters on the ECU map will have a rich value to tolerate any factory boost spikes should they occur. If the boost goes beyond what the factory ECU map can tolerate the vehicle will dive into limp mode. If you want to do thing slow that's fine but you shouldn't be bolting up an exhaust and intercooler and racing around for months. These vehicles are sensitive to inlet and exhaust changes and should be custom tuned to extract safe and reliable HP.

Hope this helps mate.