View Full Version : car is bucking after ecu flash and mbc

10-12-2006, 12:26 PM
so today i got my ko4 chip put in and had my feuling tuned as well as adding an mbc. The boost is cranked to 20 lbs btw. I notice a bucking when i am at half throttle in 2nd, 3rd, and 4th. Anyone know what the cause of this could be. I am also running on a stock exhaust if that helps.

10-12-2006, 12:30 PM
year/engine code would help a lot

take out the mbc

10-12-2006, 12:39 PM
99.5 aeb

10-12-2006, 01:11 PM
like k0mpressed said, get rid of the mbc.

10-12-2006, 01:29 PM
what if i just turn it down a little bit, would that work.

10-12-2006, 04:01 PM
MBC are not good for Audi's man they like reading that N75 you can only make the car so fast! They are so held back by small turbos!

10-12-2006, 06:11 PM
As everyone said. MBC are not for small turbos, lose it. If you just reinstall your stock N75 valve, your performance will be great and your car will boost smoothly. I've tried different N75 valves and MBC's and none of them made any positive changes to performance. Your stock exhaust has nothing to do with it.

Also, your K04 chip was not designed to push 20 psi. When you do things like that, you lean out the motor. That's not good in case you don't know.

Lose the MBC and enjoy the car.

10-13-2006, 05:07 AM
Originally posted by tombomb84
what if i just turn it down a little bit, would that work.

Or you could take it out as stated, and fix your problem.