Figured someone could make this pic a sticky or move it to the FAQ section.. Been asked a few times how to run an MBC looped with a N75 valve to get ride of spikes.. I would make a write up buts its rather self explanitory.
for the ambient Pressure you just leave that one pluged in with the line thats already there. Also you have to leave the n75 conected. The only other thing I can think of is make the vacume lines from the N75 to the MBC long enough so you can mount the MBC in a place where you can get to it.

 

Also if someone took some pics when they did it that might be a help to the other members as well. I would take some pics of my set up but it was in the old A4 not this one..

 

why not just bypass the n75 altogether? just go from the tp to the wastegate. eliminates spiking, better low-end boost, although, ALOT of self control is needed if you are going to do it this way.

tp = turbo port...not to be confused with test pipe

 

well if you do that you still have to keep the n75 valve plugged in off to the side or you will go into limp mode. the reason why you dont just run the MBC is because there is no safty net if it fails. Also you cant just up the boost with out adding more fuel so you will just run lean all the time and mess everything up.. alot of guys run just the MBC, but i wouldnt recomend it. this way you get the best of both worlds..

 

This is true, it definitely requires alot of self control, aside from your way going straight from the tp to the wg is the second safest way, it still eliminates overboost...it would be nice to have a failsafe, but my n75 is focked anyhow.

 

explain how you would need self control for this. what would going from the turbo port to the wastegate do? School Me!!

 

you need self control because it is very easy to just crank up the boost...granted you will probably run lean and fock you engine but its easy to do. also you have to keep a close eye on your boost guage because the mbc can fail/loosen off and slowly let the boost creep up.

 

Youll get the urge to crank up the boost. Its not wise, here is why: https://www.audiforums.com/m_482938/tm.htm

 

well just run the mbc not the n75. set the boost at what ever your tuning calls for and leave it

 

^^ exactly