1999 a4 1.8t aeb dbc with ko3 with 1/2 bigger compressor. overboosting with n75 at 15-20 psi. Installed mbc without n75 and with it shut all the way it'll still hit 20psi. I get 17963dtc says maximum overcharge limit exceeded. Everthing else is stock now looking towards audi tt DV and BPV from what I read they are better then my stock ones. I am thinking MBC is junk I hooked up the tee with the arrow towards wastegate otherside towards the TN. Here is a pick of it. I assume it is garbage but want to be sure. Thanks in advance. BTW I got an autometer boost gauge if that helps

 

there have been alot of people with issues with that one

 

you are also gona fvck your engine up. unless you do the diode mod (which you cant) or get a chip you can't run 20psi. all your doing is cranking up boost without altering the timing or fuel.

 

If I got a better mbc could I lower the boost to stock levels say 8-10 psi. Any recommendations for an MBC? Or because the the bigger compressor I have no choice but to chip. Thanks for the replies I really just need it to get my *** to work for now.
Turbo Kraut Do you mean issues with the turbo or MBC? Thanks

 

i have heard from some people that those, which i just recieved one after finding this out... got mine today, found out after ordering, but i am going to run it anyways... and when it craps, i will just replace the controller, since i will run the tubing and all

but i think cincytt said he just replaced his brothers, cause it quit working and he said he knew of a few more

also yes unless you chip/tune your car, you need to go back down to 10 psi max i would say.... and that might be pushing it..... a good tune, apr/giac will remap everything and saftley give you 17 psi...... ask jeff...... that is his username, he turned his boost up w/ just a mbc and blew some stuff up

 

Please let me know how it works out and how you hooked it up. I used the bleed method maybe that was a bad idea. Thanks for the input

 

No, the bleed style are what you want for a stock turbo. Dont let a bad mbc give you false beliefs

 

Cincytt,
Turbo Kraut said you have had experience with that one on your brothers car. Is the one I gota bleed style mbc? I know it says its gated on the web that I got it from but when I took the tee apart it had a ball and spring. I heard it exhaust from the mbc when I opened it, the controller seemed ok but I really have my doubts about that tee. Do you recommend a certain MBC?

 

not to thread jack, but, since i have a chip, i can use a MBC to up my boost and the ecu will adapt?

 

I actually have a simpler Turbosmart unit:
http://www.dsmtuners.com/parts/produ...roducts_id=880

This has been running well for me. Boost build-up is linear and I have the flexibility to adjust depending on the situation: ex. 18.5PSI during the summer & track sessions, while I go for 22PSI during colder months.

Double check the lines.

Assuming that you leave the N75 plugged-in (w/ lines disconnected) while running a MBC: the ECU will demand a certain boost level from the N75 since it is connected electrically, but your MBC will be running the show, so expect a bit of discrepancy (depending on what level your MBC is set at).