A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Silly technical questions...

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Old 12-05-2001, 05:55 PM
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Default Silly technical questions...

1) If I cut the line from the Wastegate to the boost frequency valve, will my turbo be able to build more than 7psi of boost? If yes, any speculation as to why it would be stuck at 7psi in this situation?

2)Where does the car pull back stock boost? In other words, in WOT 2nd gear, should I see the same boost (.7bar) from 2k to 5k? Or does the ecu pull it back from 3k onwards.

Thanks!
Old 12-05-2001, 05:59 PM
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Default Ummm...I bet my chipped K03 is SLOWER...

ECU problems
Old 12-05-2001, 06:16 PM
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*coughthirtygrandpaperweightcough*
Old 12-05-2001, 06:21 PM
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Ahhhhh-Ahhhhthatwasmyquoteandweekdogmastoleitchoooooooo
Old 12-05-2001, 06:23 PM
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Default yeah, but a choice slam like that needs to be delivered more than once..!

Sorry about your ride, cowboy. Best wishes on a speedy recovery.
Old 12-05-2001, 06:34 PM
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Thanks .and next time..Pay me for my quote..Or I will sue...
Old 12-05-2001, 07:44 PM
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Default If you cut the line to the wastegate....

your turbo will be unregulated, and boost will skyrocket (30 psi or more) This is very bad, one very short test is all you need.

If it's still stuck at 7psi, my guess would be a problem with the wastegate, possibly being stuck open.

If boost does skyrocket, you have a problem with the frequency valve or ECU. Look for leaks or bad connections.
Old 12-05-2001, 10:56 PM
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Default You cant do that on a dbw car. The boost sensor will put your car into limp mode and that is what

you are getting now. BTW when you do this the motor will blow. You will be running so lean you will most likely seize the pistons. Try to explain that one to the Dealership.
Old 12-06-2001, 04:56 AM
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you'll have to GET IN LINE
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