need help installing a mbc on my 2g t25

:headshake ok this is making me really mad, i cannot figure out how to get the turbos xs mbc to work on my car i have the stock t25 turbo i disconnected the stock bc and hooked the mbc up how it said in the directions which for some reason it didnt work it still was only hitting about 12 12.5 psi and it should have been putting out 1 psi so if anyone can give me some detailed instructions on this i would greatly appricate it

I can tell you how to install a homemade/JoeP boost controller....I wouldn't think that the xs would be any different.

Before I get to that what did you mean by this statement "it should have been putting out 1 psi"????

You need to remove the lines running to the BCS, but leave the electrical harness plugged in. The side of the MBC with the ball should be run to a T in the line coming off the BOV. The other side should be run to the WG actuator. Then all you have to do is set the MBC. Everyone recommends to start with the MBC backed our all the way and make a pull. Then stop, pop the hood and screw it in all little....repeat. Also, if you are using the stock BOV you may want to consider upgrading, it leaks. Enjoy.

Follow directions. Adjust. Done.

are you sure you installed it correctly? you have to do more then just bipass the boost control sylinoid.

if you did your homework you would know that the Turbo XS is not a good MBC for DSM's. but too late for that. 1 line from BOV, 1 line to wastegate. unplug the BCS hoses and clamp of the one not going to the wastegate. leave it plugged in or you may get a CEL.

I can tell you how to install a homemade/JoeP boost controller....I wouldn't think that the xs would be any different.

Before I get to that what did you mean by this statement "it should have been putting out 1 psi"????

You need to remove the lines running to the BCS, but leave the electrical harness plugged in. The side of the MBC with the ball should be run to a T in the line coming off the BOV. The other side should be run to the WG actuator. Then all you have to do is set the MBC. Everyone recommends to start with the MBC backed our all the way and make a pull. Then stop, pop the hood and screw it in all little....repeat. Also, if you are using the stock BOV you may want to consider upgrading, it leaks. Enjoy.


Ive got a 1g bov on 2.5 in. uicp (oh and i have done my homework i probalbly know alot more than you think i have been studying these things for more than a year i can do a 6bolt swap or rebuild a turbo with my eyes closed (boostedspyder)) I had it backed out 3 turns that eliminates the lag and is suppost to register 1 psi. and do i keep the t to the wga and turbo hooked up or break that and run the line straigh to the wga. i have tryed all these ways and they are not working but i can try again thanks for your help man

arent there other ways to installing the mbc? I mean ive done it that way as well when i had to install mine, but isnt there a less accurate installation? Also, yea man you should have just bought a regular mbc off ebay for like 15 bucks and itll do a better job than the xs. If you have the option, i would return it.

Ive got a 1g bov on 2.5 in. uicp (oh and i have done my homework i probalbly know alot more than you think i have been studying these things for more than a year i can do a 6bolt swap or rebuild a turbo with my eyes closed (boostedspyder)) I had it backed out 3 turns that eliminates the lag and is suppost to register 1 psi. and do i keep the t to the wga and turbo hooked up or break that and run the line straigh to the wga. i have tryed all these ways and they are not working but i can try again thanks for your help man

Not talking shit or anything, but let me get this correct. You can do a 6 bolt swap and rebuild a turbo with your eyes closed, but you cant install a mbc, theres something wrong with that picture. Just making an observation, thats all!

I had it backed out 3 turns that eliminates the lag and is suppost to register 1 psi.
:eek7:
Not talking shit or anything, but let me get this correct. You can do a 6 bolt swap and rebuild a turbo with your eyes closed, but you cant install a mbc, theres something wrong with that picture. Just making an observation, thats all!
:iceslolan

Not talking shit or anything, but let me get this correct. You can do a 6 bolt swap and rebuild a turbo with your eyes closed, but you cant install a mbc, theres something wrong with that picture. Just making an observation, thats all!


This is one fucked up post. This is like saying that you can build a house from top to bottom and can't install a mailbox post. WTF. How is this even possible. You think that backing out the MBC is going to give you 1 psi of boost (are you sure you aren't talking about 1 bar)? Eliminate the lag??? Shit, with 1 psi you wouldn't even know that you have a turbo. I am confused :shakehead: . You researched MBC's for a year and can't get it right? Hell, I researched it for about 5 minutes after I got it in the mail and had it installed in about 30 minutes. One year of research for a 30 minute job, and you still can't get it right? So by that estimate you must be about 70....needing 68 1/2 years to research the 6 bolt swap. :grinyes:

Go here.....

http://www.belitski.com/cars/talonmods/turbo/vfaqhallman.html

It even has pictures!!!!!

If you can't get it right after following these directions you need some help.

arent there other ways to installing the mbc? I mean ive done it that way as well when i had to install mine, but isnt there a less accurate installation? Also, yea man you should have just bought a regular mbc off ebay for like 15 bucks and itll do a better job than the xs. If you have the option, i would return it.


I think it is the bc i have hooked it up like 10 diffrent ways, have it hooked up the same way as my buddy and it is still not doing anything and my mom got me this bc for christmas, and yes me and my buddy are doing a 6 bolt swap on his 95 gst right now and i just rebuild his 14b turbo, but i cant figure out this pos mbc.

holy shit! I think i installed my mbc wrong. Well, i did everything, but unplug the y split which leads to the turbo compressor and the WGA. So what i have is the on hose going teed to the bov and the other hose plugged into the other tee where the WGa and the turbo compressor is. On the site it says to plug the compressor with a plug (which i dont have), and plug the hose from the mbc to the WGA. So should i do this, and why not keep it the same? Why plug the turbo compressor? Thanks in advance guys!

oh and sorry to invade on your thread here candy, but i thought it might help you as well if you have the same problem.

what you have now is a mbc thats hooked up right but the stock line still opens the turbo
yopu need to plug that hose otherwise your mbc doesnt do anything

I think it is the bc i have hooked it up like 10 diffrent ways, have it hooked up the same way as my buddy and it is still not doing anything and my mom got me this bc for christmas, and yes me and my buddy are doing a 6 bolt swap on his 95 gst right now and i just rebuild his 14b turbo, but i cant figure out this pos mbc.

So you rebuilt the turbo huh? BTW: What did you replace? How many bearings where there? Just wondering cause I am about to rebuild mine and I have never done it before, just want some help from someone who knows how to do it with their eyes closed...



Dont reply to this post unless you are candytangygst!!!

so just take off the tee and plug the turbo compressor and just have the hose lead directly to the WGA and nothing else? Right?

oh and to let all of you know i took my car to a shop today and i did have it hooked up right there was no spring in the mbc i had to get a new one but somehow it stayed at the stock preset


well lets see eclipse rst the 14b we ported the turbine housing to 7cm, then we replaced the the compressor wheel, center plate, spring plate and bushings, circlips, orings and the thrust bearing, then we reassembled it and sent it out to be balanced any more questions dick

Call me a dick again and you wont be welcome on this site anymore! I asked an honest question and there is no need to post a reply like that. I have never rebuilt a turbo before, thought about it and looked into it but never taken one apart.

Also use the EDIT button... Lower right hand side of your post (if ya couldnt find it with your eyes closed) So I helped ya out by combinding your 3 posts into 1!

If you want help or plan to post in this forum, read the RULES and FAQ!!! If you cant follow the rules then you will not be welcome here. Another thing, I dont see one capitol letter in your whole worthless post and there is no period. Are you done with that sentence or were you planning on coming back and finishing it tomorrow? Use grammar and spelling or your posts will be deleted!

Guys, it's not that complicated. Let me break it down:
There is a vacuum line that runs from a pressure source to the wastegate actuator. We are placing a boost controller in that line.

1 side of the MBC goes to the pressure source. I say BOV line, EclipseRST says do it to the turbo. It used to go to the turbo with the stock BCS.
1 side of the MBC goes to the wastegate actuator.

The side OPPOSITE of the adjustment screw is the line to the pressure source (IN on the MBC)

Lastly, keep the BCS plugged in, i hear it causes CEL's but mine did not.
Also, go to Autozone and get a vacuum cap for the turbo nipple that you took the stock BCS off of.

P.S. candytangygst don't insult members, especially moderators. You should know how to install a boost controller if you can do a 6 bolt swap or rebuild a turbo, which I doubt you can do either. Oh, and if your mom bought a BRAND NEW TurboXS boost controller, it had a spring.

WHICH GETS ME STARTED AGAIN, you cant have 1psi. Do some research, you are a liar if you say you have invested a lot of time in learning about your car. The BCS (stock boost controller) just adds boost to the internal wastegate which already has a minimum of 7-9psi. Why would you want 1psi? Stop worrying about lag and don't make up this bullshit. Watch and learn before you start posting because it makes you look dumb.

Here's what Jake and I have made for you guys. It's an argument about where to draw boost source.
http://files.automotiveforums.com/gallery/uploads/71499/mbc1.JPG

HAHA, yeah thats my nice little drawing! Here is the original, the way he was talking about doing it.

http://img.photobucket.com/albums/v627/Jake30/mbc.jpg

Then I had to jump in at Paint and make my drawing which he posted :icon16:

Ok... Personally I choose to hook the pressure source up to the compressor housing or LICP for a faster responce because of less vacuum line used therefor less likely hood of getting boost spike, and for a fact that if you happen to have a boost leak in your UICP the boost controller will still work to some advantage so you dont "over work" your turbo and cause an early death!

No matter where you hook your power source up to it will work the same, basically you are just using your boost gauge to set it and your boost gauge should be hooked up to the manifold anyways!

So by hooking the boost controller up to the compressor housing or LICP you still use the boost gauge to set it, which is, in return measuring the air entering the manifold.

Basically its up to you, everyone has their own opinions and options. Good luck.


EDIT: Ok I went back and explained it better for everyone, this is the way I like to hook up MBCs. You can do it this way or hook it up like the picture in the beginning of this post.

http://img.photobucket.com/albums/v627/Jake30/finalmbc.jpg

For what its worth, you can't port a 6cm housing to 7cm. The Xcm designation is the square area of the nozzle area or cross section of the volute, can't recall which now, but either way you really can't port it. ;) You can take the 6cm housing's inlet out to 60mm however, which I'm sure is what was done. Just for the sake of clarification.

oh and to let all of you know i took my car to a shop today and i did have it hooked up right there was no spring in the mbc i had to get a new one but somehow it stayed at the stock preset....

......any more questions dick
1. Why can't you punctuate?
2. Why don't you know how a wastegate operates?
3. You took an MBC to a shop and rebuilt a turbo at your house?

Eclipse rst First of all are you my fucking english teacher.(Another thing, I dont see one capitol letter in your whole worthless post and there is no period. Are you done with that sentence or were you planning on coming back and finishing it tomorrow? Use grammar and spelling or your posts will be deleted!) all three post were done at diffrent times, and it seemed like you were being a dick just like you are now so fuck you fuck this site i know what the fuck im talkin about asshole and i dont care if your a moderator you can suck my dick that dont give the right to be a dick to everyone else and the spring was fucked up the new one they gave me and installed the same way i had it hooked up works fine now, and you can run 1 psi of boost so again suck my dick and go fuck yourself asshole. and ya i bet you will feel really fuckin stupid if you ever see my dudes eclipse that me and him just rebuilt the turbo and are in the process of doing a 6bolt swap in, but you prolly would know what a 6 bolt is since you have a busted
(420a piece of shit o wait i dont know anything about these cars damn i guess thats not the motor in your car then huh!!). whats the problem you to cheap to buy gst or gsx. fuckin faggot. im 17 and have a 98 gst 69000 miles with, a 6000 dollar paint job, 2500 rims, 1g bov, intake, mbc, act 2100, 3inch all the way back, and a few other little things, plus an everyday car that i payed for not my parents, wait they bought the mbc. Oh if you werent a fuckin idiot, you would know that running it into an intercooler piping, lets the preset spike with engine load wheather and all kinds of diffrent factors, you want to regulate the pressure in your manifold, so you need to tap into one of you vacuum lines or tap a nipple into you manifold, and run it from the manifold, that is one of the best ways to get really accurate boost. (damn again i dont know what im talkin about well if any of you people know what im talkin about then cool but rst prolly dont because hes a fuckin english teacher)

eclipserst kick me off the site you fucking faggot is this your way of bullying people because if i ever saw you on the streets i would beat your ass because you look like a queer damn again there are no capitols no periods or any type grammer in this post and i didnt edit it either two post and dont put them in on bitch they are two for a reason

and you can run 1 psi of boost What wastgate woul one use for this miraculous mod?

im 17
It shows.
Oh if you werent a fuckin idiot, you would know that running it into an intercooler piping, lets the preset spike with engine load wheather and all kinds of diffrent factors, English?

Just leave asshat. I've had my fucking car since you were 9, kid, and you don't know what the fuck you are talking about. Don't let the Internet fool you.

okay well i installed my mbc correctly.....i took off the tee and plugged the turbo compressor and just ran one hose going to the WGA. Thanks guys!

woah, there is a lot of hostility in this thread...

:lol2: I love these kinds of posts. Makes me feel all warm and fuzzy about knowing that this fruit cake is about to be not welcome here anymore! :rofl:
...and ya i bet you will feel really fuckin stupid if you ever see my dudes eclipse that me and him just rebuilt the turbo and are in the process of doing a 6bolt swap in, but you prolly would know what a 6 bolt is since you have a busted
(420a piece of shit o wait i dont know anything about these cars damn i guess thats not the motor in your car then huh!!). whats the problem you to cheap to buy gst or gsx. fuckin faggot. im 17 and have a 98 gst 69000 miles with, a 6000 dollar paint job, 2500 rims, 1g bov, intake, mbc, act 2100, 3inch all the way back, and a few other little things, plus an everyday car that i payed for not my parents, wait they bought the mbc. Oh if you werent a fuckin idiot, you would know that running it into an intercooler piping, lets the preset spike with engine load wheather and all kinds of diffrent factors, you want to regulate the pressure in your manifold, so you need to tap into one of you vacuum lines or tap a nipple into you manifold, and run it from the manifold, that is one of the best ways to get really accurate boost. (damn again i dont know what im talkin about well if any of you people know what im talkin about then cool but rst prolly dont because hes a fuckin english teacher)
Actually my 420a isnt "busted". Your right, I know absolutly nothing about these cars, I just pretend and guess but somehow almost everytime I'm right? No I'm not too cheap to buy a GST/GSX, here I'll break it down for you. I'll even include my trucks. I make good money and by no means am I cheap!

I own:
97 RS - turboed
97 GST - 6 bolt
95 GSX - 6 bolt
97 Spyder - AWD swap + 6bolt
98 GSX - getting a 6 bolt

Trucks:

00 Silverado
91 S-10 - Fuel injected 454 / 12 bolt rear end
85 S-10

Now, I bet you feel really fucking stupid dont you? I'm sure any moron could do a 6 bolt swap in a 2g. Can you put a 454 in a S-10? Didnt think so... No I didnt do it by myself, had the help of a friend but thats besides the point! You dont have to march in here and think your some big shot for doing a 6 bolt swap.

And by the way I'm not your english teacher. :loser:

Can you say BYE BYE. :thumbsup: Sorry I just couldnt resist being a smartass!

http://img.photobucket.com/albums/v627/Jake30/candytangygst.jpg

Oh shit, you have a DSM at 17? Can't install a MBC? Well, I have 2 turbo DSMs faster than yours. Jake has 4 or 5 including the 420A which is faster than yours. LOL

aggh shit now im having some problems. The car is idling real high at exactly 1250 rpms. Also, there is a lot of lag which i think may have to do with the high idle. The boost is set fine at 15 though. I installed it exaclty as the picture is shown on the top of Jakes post (the first picture). I put a cap on the turbo compressor, ran one hose going to BOV (bottom nipple on mbc) and one hose going to WGA (side nipple on mbc). Do you think it might have do with the hose or the tee? Please help!!

Nevermind. I forgot to plug in the MAF. Im such a dumbass.

haha sweet! I do that all time too, we're both dumbasses :D

not to take it off subject but ,i just got done with my new installs (Dejon tool UICPs , greddy type s BOV) and my car runs the same venting or recirculating , verturally no differance...in the past i read all the posts about how bad venting is with a stock MAF, guess i was under the impression that my car would run terrible when it actually runs quite well...wierd...

On some cars it will run well in general, but there will be times when you regret. For example, take an on ramp fast using enough maintenance throttle to just stay on the verge of boost. It can get ugly ;) Its these odd times that things go to hell, no matter how well I got my car to run well with all of the contraptions I came up with. And its usually the times when you can least afford an upset car/motor/balance.

so i should just leave the recircualting tube on ,just so its one less thing to go wrong...i think ill leave it on...

Its a matter of personal taste, tolerance for these odd behaviors, and how the car is used. I ran vented for years, like I said. I just learned to deal with or drive around the issues it had. But I also spent a lot of time and energy coming up with systems that would allow the car to run pretty well. But when I went to the MAFT, it was like a while different car. I had become used to the way it ran, and then when it really ran well, the way it is supposed to, it was a bit of a shock. :) But its up to you. You can go back to stock any time as long as the BOV has provisions to.

so i should just leave the recircualting tube on ,just so its one less thing to go wrong...i think ill leave it on...

I would leave it on man. I mean there really is no performace advantage anyway, right?