Hmmm......I've been looking into one of these. I have a K04 and the onset of the turbo is a little bumpy. Once it's spooled in the 3k range it is smooth as can be but the 2.5-3k range isn't. Anyone think the MBC would smooth out the initiation of the turbo? It felt this way with just a chipped K03 but has been magnified a bit with the K04. Hmmm.........


99 AEB K04
Brullen exhaust
GIAC PC16
310 injectors
n75j

 

What is a MBC? what does it do?

 

Hmmm......I've been looking into one of these. I have a K04 and the onset of the turbo is a little bumpy. Once it's spooled in the 3k range it is smooth as can be but the 2.5-3k range isn't. Anyone think the MBC would smooth out the initiation of the turbo? It felt this way with just a chipped K03 but has been magnified a bit with the K04. Hmmm.........


99 AEB K04
Brullen exhaust
GIAC PC16
310 injectors
n75j

I also have a '99 AEB K04 with a GIAC chip but not PC16 and 310 injectors. I see for the PC16 upgrade AWE recommends an FMIC. Did you also do this? I have the same "lag" between 2-3K rpm.

 

i have had one on my car since day 1. I will be upgrading to an electric boost controller. It is more surgy than normal. So your passangers get thrown around the car a bit to much. It is better than stock though.

 

What is a MBC? what does it do?

Manual Boost Controller. In our cars the N75 valve controls boost levels by allowing the wastegate to open or close.

What the MBC allows you to do is take the N75 out of the equation, and puts you in control of boost levels.

It basically allows you to choose what kind of levels you want to achieve. On stock programming, it isn't wise to go higher than 10 PSI...I know that doesn't sound like much compared to stock, but since the AEB doesn't hit peak boost untill 3.5k or so RPMs, with the MBC I hit 11 around 2.8-3k RPMs...basically I'm at full boost, while you're still trying to spool up .

It does take a bit getting used to though, if you start to get into it off the line, watch out cause it'll put you in your seat.

 

wow, that's nice, it give u early boost . is there any installation write up on this? lol I am chipped with intake and exhaust, so how do you adjust the controller? How many ppl in here are using this?

 

I know that doesn't sound like much compared to stock, but since the AEB doesn't hit peak boost untill 3.5k or so RPMs, with the MBC I hit 11 around 2.8-3k RPMs...basically I'm at full boost, while you're still trying to spool up .

Are you referring to peak boost (actual pressure) or peak torque?

 

Are you referring to peak boost (actual pressure) or peak torque?

Boost.

I have no way to measure torque (minus an email dyno), but I do have a boost gauge. I wouldn't tell you something that I'm not sure about.

 

This has been discussed before. Here is sweet write up.

http://forums.audiworld.com/tt/msgs/1125414.phtml

 

I'm thinking about installing an MBC to hold me over untill i chip my '99 1.8t b5 this summer. I was wondering what the general opinion about puttting one on a car with only a 710n, and a boost guage. How much boost would be considered safe on stock software, ext. thanks

another question:
if i went with an MBC, air/fuel ration guage, 4 or 5 bar FPR, i should be able to hit higher boost than a chip could, or is the stock software going to restrict me?

 

Hmm what turbo do you have that you would hit peak boost at 3.5k rpm?

 

I'm thinking about installing an MBC to hold me over untill i chip my '99 1.8t b5 this summer. I was wondering what the general opinion about puttting one on a car with only a 710n, and a boost guage. How much boost would be considered safe on stock software, ext. thanks

another question:
if i went with an MBC, air/fuel ration guage, 4 or 5 bar FPR, i should be able to hit higher boost than a chip could, or is the stock software going to restrict me?

For the 40-50 dollars you'd spend on it, it's a good hold over. My performance mods consist of an Evoms Intake, Magnaflow exhaust, 710N valve...I think thats it? On stock software, this is going by Rusty's reccomendations, I wouldn't go over 11lbs. Usually the stock fuel maps have a little headroom in them, and I wouldn't go much higher than that.

Honestly though, even though I only peak 3-4 PSI higher than I did before, the difference is night and day.

I'm on a stock K03 turbo, but the MBC allows almost instant spool up.

 

is this gona harm th eengine?

 

of course an mbc would put more load on the engine, but tuned correctly, an mbc can be used safely.

 

While it's not as fine tuned as a chip...you aren't changing any fuel maps to account for higher boost...it still only costs 40-50 bucks.

 

ok, so i decided that it's worth a try, there are 2 types of MBC that Dawes makes

the basic and the hybrid
this one look easier to adjust

which do you have, and do you think the hybrid is worth the extra cash

 

on the early AEBs, they use small injectors, compared to the later ones, and you're limited to 16.32ms.

 

Rusty's member profile is basically the bible for mbc related mods, check it out if you haven't already!

 

I also have a '99 AEB K04 with a GIAC chip but not PC16 and 310 injectors. I see for the PC16 upgrade AWE recommends an FMIC. Did you also do this? I have the same "lag" between 2-3K rpm.

I don't have the FMIC but even in 5 degree weather it lags the same. I know I'm being picky, it isn't that big of a "lag" but it is noticeable. Maybe a high flow cat is next, I don’t know.

 

on the early AEBs, they use small injectors, compared to the later ones, and you're limited to 16.32ms.

I thought all AEBs had the 210cc injectors...it wasn't till the ATW motor did they start coming with the 252cc injectors?

 

would these injectors be interchangeable???

 

I thought all AEBs had the 210cc injectors...it wasn't till the ATW motor did they start coming with the 252cc injectors?

not sure how accurate this is, but came across this:

http://vwmod.com/fuel.php

 

would these injectors be interchangeable???

AEBs are ev6, atw are ev12.

 

very curious about this too. i have a 99 with about 113,000 miles. with cone filter diverter valve and i have a boost gauge installed to check the psi. is this a good idea to do it at this mileage? just lookin for something to make my baby quicker for the time being. lookin to get a k04 in the future. someone please educate me about this MBC deal. heard alot about it

 

very curious about this too. i have a 99 with about 113,000 miles. with cone filter diverter valve and i have a boost gauge installed to check the psi. is this a good idea to do it at this mileage? just lookin for something to make my baby quicker for the time being. lookin to get a k04 in the future. someone please educate me about this MBC deal. heard alot about it

you can read this thread here:

http://www.passatworld.com/forums/showthread.php?t=105475

but basically, install the mbc, and slowly raise the boost 1-2 psi, then log WOT 3rd gear runs, block 2, 20, 31. make sure timing pull (block 20) is in the low single digits, and block 31, front o2 sensor (1st set of #'s) are at least .875 from about 4000rpm to redline.