I have a 99 audi a4 1.8 tip.I boost 10 in frist gear 12 in second gear. and 15 3 and 4th.I put a mbc between the n75h and the wastgate it will only hold 10-11 all gears dosent matter if i turn the noob.It is a 2 prong turbo xs. I do have the n75 still hooked up.I even hooked the mbc up between both turbo hoses it was holding 12.what am i doing wrong? it has a apr chip.

 

What are you using a mbc for if you just have a chip?

 

it wont boost over 12 psi in 2 nd and 15 in 3 and 4 th .i have the race n75h valve .and i did a leak test with pressor.I see others boosting 18-20 .i have a tip chip.

 

very strange why you are limited to such low psi... check for fault codes and go back to the stock n75 to see what happens with it. Do a TBA as well if you are DBW... I think some late model 99's are DBW, not positive on that though.

 

what is dbw. and tba? i switched back to the stock n75 it is the same the stock n75c. I put a audi tt n75h .never spikes over 15. and holds 12-14 most of the time and tappers off at3800rpm. Im think of upgrading to a awe ko4 with gica softwear

 

DBW= drive by wire... no direct physical linkage between pedal and throttle body
TBA= throttle body adjustment

 

it is not drive by wire .How do you do a tba?what shoud my car be boosting in all gears with my upgrades?If

 

I dont know why you guys mess with the n75 or add mbc. APR doesnt do it, GIAC doesnt do it, REVO doesnt do it, they don't tell you to. Leave those things the way they are, it will only be problems

 

ECS (apr dealer) sells them and lists what engines it is compatible with fool! The giac dealer i got chipped at sells them and the owner has a J valve in his a4. Some people have problems with them, but it is on a case by case basis. I agree that a mbc isnt really needed for anything other than a BT setup.

 

what is the diffrence between the n75h and the n75j valve?i have a audi tt from audi n75h.is there a diffrnce between them or the ecs one?