forge manual boost controller problem help please.

[harissehagic]

okay heres the deal im driving a gti it has a APR 93 oct chip apr cold air intake all forge boost piping including turbo inlet pipe. apr 2.5 downpipe and more little stuff. I bought a forge MBC (3 ports) i tried hooking it up as a replacement for the n75 valve i lost boost. i hooked it up to the intercooler piping on one side and wastegate on the other no change.. i tried splicing the waste gate hose to runthem through with the intake at the bottom and the intercooler hose nothing changed. and last i tried hooking it up from the fuel reg. hose i used a t fitting with the hose running off the bottom of the t to the MBC and that dropped the boost to 5 psi. so if you have anything inquaries please let me know

ive looked at all the diagrams and most of them are two ports.. so i cant relate.. Pictures of your set up would be great. much appreciate it. please help this is pissing me off hahah.

[harissehagic]

Bump!!

[Enve805]

An MBC won't work if your MAP* sensor doesn't correspond with it. You said it has an APR 93 chip, are you 100% positive? What did your car boost prior to installing MBC and going into 5psi limp? As ghetto as it sounds, you might want to try the diode mod, bypass the N75 and see if that allows you to actually adjust your boost and get out of limp. Next option would be to get an N75R (race). Check your wastegate and make sure it's not tightened so hard it's closing. Diverter diaphragm ripped? Boost/vac issues are fairly simple on these cars.

[harissehagic]

An MBC won't work if your MAF doesn't correspond with it. You said it has an APR 93 chip, are you 100% positive? What did your car boost prior to installing MBC and going into 5psi limp? As ghetto as it sounds, you might want to try the diode mod, bypass the N75 and see if that allows you to actually adjust your boost and get out of limp. Next option would be to get an N75R (race). Check your wastegate and make sure it's not tightened so hard it's closing. Diverter diaphragm ripped? Boost/vac issues are fairly simple on these cars.

with my chip im spiking around 21 psi on a good day. how would i by pass the n75 valve?

[harissehagic]

im 100% sure on my chip.. and this is the boost controller i have currently.
http://www.google.com/imgres?start=2...:21,s:200,i:67

there is one port at the bottom.

[Enve805]

PM'd you all the helpful links. Google is your friend. Many ways to "bypass" the N75, parallel, loop it off, etc. Read up.

[Big_Tom]

An MBC won't work if your MAP* sensor doesn't correspond with it. You said it has an APR 93 chip, are you 100% positive? What did your car boost prior to installing MBC and going into 5psi limp? As ghetto as it sounds, you might want to try the diode mod, bypass the N75 and see if that allows you to actually adjust your boost and get out of limp. Next option would be to get an N75R (race). Check your wastegate and make sure it's not tightened so hard it's closing. Diverter diaphragm ripped? Boost/vac issues are fairly simple on these cars.

wut MBC wont work if your map doesn't correspond with it

[Enve805]

wut MBC wont work if your map doesn't correspond with it

Yeah, the sensor on top of your intercooler? You can't just put a MBC on a car and expect to be able to turn up the boost, the MAP sensor tells the ECU when its at max boost for stock, hence why I asked if he was positive he was chipped. If it tells the ECU you're getting 21psi its going to limp, but he's chipped so it doesn't matter. An MBC strictly affects the air pressure being delivered to the wastegate actuator, nothing more. It's not going to magically boost more unless the rest of the car is willing to work with it, aka "correspondence".

[scirockalot8v]

if your chipped/flashed why do you need a MBC thats the whole reason behind getting flashed.

[Big_Tom]

Yeah, the sensor on top of your intercooler? You can't just put a MBC on a car and expect to be able to turn up the boost, the MAP sensor tells the ECU when its at max boost for stock, hence why I asked if he was positive he was chipped. If it tells the ECU you're getting 21psi its going to limp, but he's chipped so it doesn't matter. An MBC strictly affects the air pressure being delivered to the wastegate actuator, nothing more. It's not going to magically boost more unless the rest of the car is willing to work with it, aka "correspondence".

MAP sensor only reads pressure. you put a MBC on the car installed correctly and the car will boost whatever u tell it to (within reason) on a chipped car. unless you are trying to get 50 psi on a k03s or something like that. being chipped removes that lower psi overboost threshold set by the factory. it has nothing to do with the map sensor itself, as it only provides a reading to the ECU. you can skip trying to school me on how a MBC works, because i have a few and i know how they work

[harissehagic]

I have a forge side mount do you think that ****s with it? Stupid question

[harissehagic]

Okay so I took the waste gate hose and plugged it on the left side and attached a norther hose on the left side which connects to the top nipple of the n 75 valve. I ran the car it spools much faster and it's not dropping as much boost although I can't run more than 21 I'm completely fine with that.

Did I do it right?

[harissehagic]

bump

[Big_Tom]

this should answer all your questions

http://www.forgemotorsport.com/media...lveInstall.pdf