Could someone please help me with a mbc installation on a 1g?

[Deadly BlaZe]

i've looked through like 232453 different threads trying to figure this but still didn't get it. Almost all of the instructions were for a 2g (not sure if its the same for a 1g) but it seems like the hoses are routed different, i've looked at this pic and it just didnt make sense

any help would be appreciated. oh and please dont show me other links to threads...i've probably seen them all. i'm not too familiar with the vacuum lines around the turbo/intake so could someone help me out please? thanks

 

[JamiesTSI]

It's been awhile, but I believe you will need the hose with the red stripe coming off the throttle body for your source. Take the boost control solenoid out also and just hook it up per your diagram. Hope this helps.

 

[MrBoxx]

A better way to install the MBC would be to use the nipple that comes off your 14b turbo's J-pipe. This gives the best positive pressure source. That's where the stock BCS gets it's pressure signal; why change it? J-pipe nipple to vacuum hose to boost controller inlet to rubber hose to wastegate nipple. Simple.

 

[Deadly BlaZe]

A better way to install the MBC would be to use the nipple that comes off your 14b turbo's J-pipe. This gives the best positive pressure source. That's where the stock BCS gets it's pressure signal; why change it? J-pipe nipple to vacuum hose to boost controller inlet to rubber hose to wastegate nipple. Simple.

So wait, the hose from the j-pipe goes to the which part of the mbc? i didn't really understand all that...remember i'm a rookie..you have to be more specific

 

[tranman91]

So wait, the hose from the j-pipe goes to the which part of the mbc? i didn't really understand all that...remember i'm a rookie..you have to be more specific

On the j-pipe of the 14b there is a nipple with a hose attached to it...this leads to the stock BCS.(boost control solenoid)

Instead of tapping the bov line as in the picture above...run your pressure source off the nipple of the j-pipe instead.

In the picture above...the line tapping into the bov line would be the one connecting to the j-pipe pressure source...if you choose to do it this way.

 

[tranman91]

It's been awhile, but I believe you will need the hose with the red stripe coming off the throttle body for your source. Take the boost control solenoid out also and just hook it up per your diagram. Hope this helps.

This is incorrect...

Do not connect your manual boost controller to the throttle body...The red striped hose ("P" line) on the throttle body is an option for connecting an after "market boost gauge" not a MBC.

 

[MrBoxx]

Instead of tapping the bov line as in the picture above...run your pressure source off the nipple of the j-pipe instead.

Yes. So in the picture you found, erase the BOV and the the manifold. The vaccuum hose that tees into the BOV line would instead run to the nipple on the J-pipe. The other end of that hose fits onto the bottom of the boost controller (most likely, unless you made your own and used a different design) and the side-outlet of the boost controller should have a hose going from it to the wastegate.

 

[Deadly BlaZe]

ok i think i'm starting to understand this. Now i have a question. In the stock set up, is the line from the bov to the intake manifold supposed to be T'd to another line (as in the diagram), because mine just has a straight line coming from the bov to the intake manifold. My car DID have a T in between the j-pipe to the bcs and the wastegate. Here's a pic:

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the line from the left of the T is connected to the wastegate, the right one is to the j-pipe, and the middle one is to the bcs.

 

[95blackGsTurbo]

Take all of that off. Just run a straight vacuum line from the MBC to the wastegate. Then from the MBC to the nipple on the turbo outlet pipe. That's all you need.

 

[oldman]

Which mbc do you have?

 

[oldman]

Take all of that off. Just run a straight vacuum line from the MBC to the wastegate. Then from the MBC to the nipple on the turbo outlet pipe. That's all you need.

2Gs will throw a CEL if the BCS isn't plugged in so remove everything but leave the bcs plugged in then cap off the nipple on the intake pipe.

 

[Deadly BlaZe]

2Gs will throw a CEL if the BCS isn't plugged in so remove everything but leave the bcs plugged in then cap off the nipple on the intake pipe.

i dont have a 2g, i have a 1g.

i bought the mbc from ebay. It's called the Voodoo 2 mbc. the company had 100% positive feedback so i think it's reliable.

Anyway, i just installed it. Wastegate to outlet of mbc, Turbo outlet pipe to inlet of mbc. Correct? The car is boosting 14-15 psi now. I'm hoping thats safe on a stock fuel system and 14b.

 

[oldman]

Did you cap off the nipple on the intake pipe which the bcs use to run to?

 

[Deadly BlaZe]

Did you cap off the nipple on the intake pipe which the bcs use to run to?

I left the vacuum line running to the intake pipe on. Should i be taking that off too? I just took the line from the bcs off the T and capped it off.(as in the above picture)

 

[oldman]

I left the vacuum line running to the intake pipe on. Should i be taking that off too? I just took the line from the bcs off the T and capped it off.(as in the above picture)

Remove the bcs along with the hose then cap off the nipple on the intake.

 

[Deadly BlaZe]

Remove the bcs along with the hose then cap off the nipple on the intake.

should i unplug the electrical harness off of the bcs too? what could i cap off the nipple on the intake with? that hole is tiny.

 

[oldman]

should i unplug the electrical harness off of the bcs too? what could i cap off the nipple on the intake with? that hole is tiny.

You said you have a 1G so the bcs doesn't need to stay in there, remove it from the car and zip-tie the plug some where safe. Any auto parts store sells nipple caps, get one with assorted sizes which you might find handy in the future.

 

[Deadly BlaZe]

Thanks for all the help guys . Just one more question, so i set the mbc to 14-15 psi, but It doesn't hit it until about 4k. Is that normal?

 

[oldman]

Thanks for all the help guys . Just one more question, so i set the mbc to 14-15 psi, but It doesn't hit it until about 4k. Is that normal?

Yes, that is normal for a 50trim + turbo...wait you have a 14b. No, that is not normal at all, when were you hitting full spool before the mbc install?

 

[chicagoavenger]

Thanks for all the help guys . Just one more question, so i set the mbc to 14-15 psi, but It doesn't hit it until about 4k. Is that normal?

Like Oldman said no that is not normal. While your at it might as well do a boost leak check.

http://www.vfaq.com/mods/ICtester.html. I recommend doing this at least every oil change.

 

[Deadly BlaZe]

Yes, that is normal for a 50trim + turbo...wait you have a 14b. No, that is not normal at all, when were you hitting full spool before the mbc install?

well it used to fully spool at 10.5 psi @ about 3.3k. I gotta tell you though...that extra 5 pounds makes a difference when its fully spooled. Oh, and i have done a leak test and i was leaking through piping that wasn't secured tight enough. But i think i got most of them clamped on good.

 

[calcifer]

I don't see a boost gauge in your profile, do you have one (not the stock one)? If not, don't beleive what your stock gauge is telling you, go get a real boost gauge.

 

[oldman]

well it used to fully spool at 10.5 psi @ about 3.3k. I gotta tell you though...that extra 5 pounds makes a difference when its fully spooled. Oh, and i have done a leak test and i was leaking through piping that wasn't secured tight enough. But i think i got most of them clamped on good.

How much pressure and for how long was the intake able to hold during your pressure test? 16psi at 4k is not right for a 14b, check for exhaust leaks before turbo and repeat that leak test until you can pressurize the intake up to 20psi and allow no less than 30sec before it bleeds down to 0.

 

[Deadly BlaZe]

I don't see a boost gauge in your profile, do you have one (not the stock one)? If not, don't beleive what your stock gauge is telling you, go get a real boost gauge.

sorry i do have an aftermarket gauge, i should probably write that in there. And i pressurized the system at 10 psi and it held like that for a good ten minutes.

 

[oldman]

And i pressurized the system at 10 psi and it held like that for a good ten minutes.

10 psi on the boost gauge or your air compressor? In any case, 20 psi on the boost gauge is your final goal, time for a re-test.