Sooooooo, my car is still making no boost. Here's what's been done so far to trouble shoot:....
09-03-2006, 08:26 PM
#1
AudiWorld Super User
Thread Starter
Sooooooo, my car is still making no boost. Here's what's been done so far to trouble shoot:....
(Oh, for the record, home brew stage III with plain KO4s). It happened all of the sudden - no smoke, no noise - nothing.
1. Checked for codes - none
2. Logs - seem OK - requested boost is what it should be actual is ZERO.
3. Pressure tested - leak at the coupler attaching the lower inlet pipe to the upper inlet pipe - fixed - no more leak - still no boost (shouldn't have been an issue since it's on the intake side anyway)
4. Downpipes came off - exhaust side of the turbos looked fine. The wheel spins freely and smoothly.
5. Pressure tested the wastegates - they open and close smoothly
6. Compressor side of the turbo examined with my eyeballs - the wheel spins with easily when the exhaust side is spun - - fins looks fine.
7. BPV were taken out of the loop by completely disconnecting the vaccuum lines - - essentially, I removed the BPVs since there would be no way for them to open - - still no boost.
Any more ideas? I am running an EBC (but tried a MBC just in case my AVC-R was broken) and no N75 over boost control. Unhooking the BPVs essentailly takes the N249 out of the picutre. I'm lost at this point.
The car is begging to be shipped to Piggie but I really think this may turn out to be something stupid right in front of my eyes - what am I missing?
1. Checked for codes - none
2. Logs - seem OK - requested boost is what it should be actual is ZERO.
3. Pressure tested - leak at the coupler attaching the lower inlet pipe to the upper inlet pipe - fixed - no more leak - still no boost (shouldn't have been an issue since it's on the intake side anyway)
4. Downpipes came off - exhaust side of the turbos looked fine. The wheel spins freely and smoothly.
5. Pressure tested the wastegates - they open and close smoothly
6. Compressor side of the turbo examined with my eyeballs - the wheel spins with easily when the exhaust side is spun - - fins looks fine.
7. BPV were taken out of the loop by completely disconnecting the vaccuum lines - - essentially, I removed the BPVs since there would be no way for them to open - - still no boost.
Any more ideas? I am running an EBC (but tried a MBC just in case my AVC-R was broken) and no N75 over boost control. Unhooking the BPVs essentailly takes the N249 out of the picutre. I'm lost at this point.
The car is begging to be shipped to Piggie but I really think this may turn out to be something stupid right in front of my eyes - what am I missing?
09-03-2006, 09:13 PM
#2
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Wastegates closed = default = boost = true for ripping all of the electronics and...
valves off the car. Requested boost = 100% all of the time if the MBC, N75 and EBC are are disconnected. Because, again, the wastegates are closed. I didn't follow the last posts too closely but you can verify wastegate operation with a MityVac.
