Pulling WG line off for max boost
Jun 21, 2011, 03:08 PM
#18
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40+ psi and stock turbo should never be mentioned in the same sentence. At that point your intake temps are off the chart. It's just too small.
Fred
Fred
Jun 21, 2011, 05:33 PM
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This is going to push your turbo hard but you most likely won't see crazy high psi #'s, the engine is going to be out flowing the turbo. You are going to def be pushing the turbo to it's limits so unfortunately you are going to destroy that turbo. . . . when? i dunno maybe a day maybe a year.
Jun 21, 2011, 05:38 PM
#20
^according to most others in this thread it wont hurt anything.
To 03white gsr sorry but you are wrong. In no way will the wastegate open with it being disconnected. For one, the wg opens the opposite direction the spring collapses, so there fore without the wg vacuum line the exhaust pressure would have to pull the spring open before the wg opens, that's why you can adjust them for more preload and get more boost. The pressure seen in the vacuum line to the wg is what pushes the spring together and allows the wg to open
To 03white gsr sorry but you are wrong. In no way will the wastegate open with it being disconnected. For one, the wg opens the opposite direction the spring collapses, so there fore without the wg vacuum line the exhaust pressure would have to pull the spring open before the wg opens, that's why you can adjust them for more preload and get more boost. The pressure seen in the vacuum line to the wg is what pushes the spring together and allows the wg to open
vacuum line to wastegate actuator disconnected = flapper stays shut until enough exhaust pressure exist to overpower the spring in the wga holding the flapper shut
boost controller connected to wastegate actuator but turned 100% up = not the same thing, but essentially will try to keep all pressure from the wastegate actuator as best as it can.
boost controller connected to wastegate actuator but turned 100% up = not the same thing, but essentially will try to keep all pressure from the wastegate actuator as best as it can.
A GM BCS at 100% duty cycle will fully seal the airflow off and vent the actuator line. LOTS of people on here run the IX turbo at 100% duty cycle from like 6000 RPM on. They typically have it under 100% below there though to limit peak boost.
FWIW, with proper tuning on good fuel and the stock wastegate actuator, I wouldn't be particularly scared of the IX turbo with the line disconnected. It will make over 30 psi, but only briefly. Turbo speed will also be in the range of "reasonable." At least by the standards around here of people running stock blocks to 550+ WHP...
Now a 25 psi actuator can probably sustain some serious turbo shaft speeds that may kill the turbo. Then again, Aaron made like 500 WHP on an IX turbo for like 2 years solid. I imagine shaft speeds were WAY up there...
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