Mk3 not boosting ! Help....

venomstreetmachine · 08-26-2009, 10:48 PM

Hi guys, I got this sweet Mk3 with all kinds of mods.
i just built this engine with stage 2 internals.
Got a super T4 turbo with 3' V band and an external Tial wastegate.
I also have a Turbo XS T4 manifold.
I have everything hooked up but I am not getting any boost.
The turbo has no shaft play, spins freely by hand ( its brand new)
I start the car and when I rev up I should hear the turbo or see some boost but I dont. I checked all intercooler pipes and vacuum lines,,, checked OK
I reved it up to 5K RPM and let off the gas, my HKS BOV should have gone woosh ! My boost gauge shows -10 and when i gas it, it goes to 0.

Does anyone have any ideas? Perhaps anyone have Vacuum diagrams on the 7MGTE?

Also, what symptoms would occur if the knock sensor is not hooked up and the O2 sensor not plugged in?

08-26-2009, 10:48 PM	#1
venomstreetmachine Banned Join Date: Jun 2009 Location: Abilene Tx Posts: 10	Mk3 not boosting ! Help.... Hi guys, I got this sweet Mk3 with all kinds of mods. i just built this engine with stage 2 internals. Got a super T4 turbo with 3' V band and an external Tial wastegate. I also have a Turbo XS T4 manifold. I have everything hooked up but I am not getting any boost. The turbo has no shaft play, spins freely by hand ( its brand new) I start the car and when I rev up I should hear the turbo or see some boost but I dont. I checked all intercooler pipes and vacuum lines,,, checked OK I reved it up to 5K RPM and let off the gas, my HKS BOV should have gone woosh ! My boost gauge shows -10 and when i gas it, it goes to 0. Does anyone have any ideas? Perhaps anyone have Vacuum diagrams on the 7MGTE? Also, what symptoms would occur if the knock sensor is not hooked up and the O2 sensor not plugged in?

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