MBC problems, and some other stuff, help?

[clownface]

hey all, its really early in the morning and i just got back from doing some "test" runs on the car and hangin with some friends. I was having some fuel cut crap before i put my guages and mbc in and stuff that this is what ive come up with after i put all the stuff in. My vaccume is at 15 on start up then moves to 20 once it gets warm. I cant seem to controle my boost at all with my MBC, no matter if its all the way in or all the way out im still hitting 20psi or more, its not spiking or creeping cause its just sitting at like 20 or 22 psi. Once the Boost gets up that high though im hitting fuel cut but i cant get the boost to go down. O and something else i noticed that i thought was odd, when im just like poking around at like say 2k in 2nd or 3rd or something like that the boost gauge reads im in the vaccume and not boost, normal? its almost as if the car only getting boost when im at WOT or getting close to it, is that how its supposed to be? O and one other thing, on my last run the car started to bog like crazy, the gas pedal wouldnt give the car power, sputtering, backfiring and stuff like that.....and i have a CEL, i think thats from all the fuel cutting shaking lose the MAS wires, ill have to give it a look in the mornin but im pretty sure thats what it was so dont worry about that yet. Im more concerned about why i cant do anything but 20 or more psi. i want to do 15 MAX so im not fuel cutting and all the shit......help?

o and something else thats bothering me, ive gutted my interior, and ever since i did that my Fuel pump is loud as crap, i know its cause ive taken the interior out but still....should the stock pump even make a sound when its got no dampering? or do you think i have a aftermarket pump i dont know about? its pretty loud....thats why im asking...

 

[1LE]

You will only have boost under load. So, no boost when piddling around town

Sounds like the MBC is not installed properly too.

 

[clownface]

okay cool, no boost with no load, understood.

Any thoughts or opinions on the fuel pump being loud, normal for stock or do i have a aftermarker one or is it going bad or something?

I think i have it hooked up right, bottom line is T'ed into the intake manifold to CBV vaccume line and the side line is going straight to the wastegate, ill go double check it though. Any other reasons why i might not be able to control my boost at all?

i serously need help to get this boost under my control, 20 psi and up is not what im wanting to be doing, im wanting 15 with no fuel cut.

 

[1LE]

No clue on the fuel pump. Never been in a gutted DSM that still had the stock pump

You *could* have a stuck wastegate actuator. It's rare, but has happened... Check all the lines for any kinks in them. Maybe even pull them off and look to see if there's any obstructions in them?

 

[clownface]

okay ill do that and get back with what i find out. One thing i did notice is that it was really hard to get the hoses i had on the MBC, almost like there to small, the hose im using is alot smaller then the one going from the intake manifold-BOV, does anyone think having to small of a hose would do this? the odd thing is the small hose fit perfectly on the wastegate nipple, but the hose seems to small for the MBC fittings and its alot smaller then the line from BOV to manifold......help

 

[clownface]

if i grab the actuator should i be able to move it back and forth it with my hand? if i cant move the thing with my hand does that mean its stuck? i havnt tryed yet. if thats wont work then how can i find out if its stuck closed or if its something else?

 

[jrpmp69]

Did you also cap off the compresor nipple? That is one of the things you should do when installing an aftermarket MBC. I had the same problem with my car except my problem was not setting the MBC properly. Read the instructions one more time and make sure you are doing everything properly.

 

[clownface]

im not sure that my turbo has a compressor nipple, ive never seen it. If it did, if i left it open wouldnt it make the boost stay low due the massive amount of air i would be losing through the nipple?

"I had the same problem with my car except my problem was not setting the MBC properly"

Tell me about your problem and how you fixed it, maybe i have the same problem.

 

[clownface]

okay so i just checked the wastegate and the lines, the lines seem fine altough im still wondering if maybe i used to small of a hose size. I took the actuator arm off the flapper and check the flapper, it moves freely, but i pulled farly hard on the actuator arm and it didnt even budge, does this mean its stuck? broken? should i go and and give a even harder pull? i didnt wanna pull to hard cause i didnt wanna break anything but how hard should i have to pull before it moves? o and im using a 13g turbo from a...1st gen auto i guess, i dunno where it came from really. o yeah and if i didnt already say it that other stuff was from where the MAS connections came off and i already fixed that, so now my only thing is getting this boost under control.

 

[jrpmp69]

Originally posted by clownface
im not sure that my turbo has a compressor nipple, ive never seen it. If it did, if i left it open wouldnt it make the boost stay low due the massive amount of air i would be losing through the nipple?

"I had the same problem with my car except my problem was not setting the MBC properly"

Tell me about your problem and how you fixed it, maybe i have the same problem.

Take a look at this website for instructions on installing a MBC. They might help.

http://www.turboxs.com/eclipse gen 1 boost controller help.htm

As to my problem:
I didnt know that the boost controller contolled boost only after your wastegate, which is about 8-10 psi (Stock), so i was setting the MBC at 15 psi, which was actually 23-25psi if you add what the wastegate holds. After realizing this, i started to assume that the wastegate was at 8 psi and set the MBC to 7 psi for a total of 15 psi which is what my boost gauge would actually read after fixing this.

As to your wastegate:
Your wastegate should be pretty hard to push depending on how much psi it holds. If you have a bigger turbo than stock, it probably is a 15-17 psi wastegate, meaning that that is how many lbs of pressure u have to put on it in order to move it.

 

[clownface]

im almost 100% sure its on there right, its a joep xz, the new style one, its got a bleeder hole, dual ball and spring and a line coming out the bottom and the side, the side line is going straight to the wastegate nipple, a the line coming out the bottom is going to the T in the BOV to the intakemanifold line...thats the proper way to instal isnt it????? o and ive got its set on as low boost as itll go, the screw thing is as far out as itll go without falling out or leaking and stuff. Im gonna go out there and pull as hard as i frigin can on that actuator arm and see if it moves, if it dosnt then im gonna guess that its broken.....if pulling hard on the acutator arm is a bad idea then please tell me soon, im not gonna do it right now but im gonna in alittle while, ill check back here before i do.

 

[2GeNTSi]

My mbc is also doing this, I have it setup exactly as it says on every set of instruction I've read. There was another thread on this problem, I went ahead and emailed the company who made my mbc. They suggested instead of running the hose to the bov line, run it directly to the turbo. I haven't tried it yet but I might do it tomorrow to see how it goes.

 

[clownface]

hmmm, youll have to tell me if that fixes it or not. So would that give the mbc line a better flow of air or something? I think ill email the people i got mine from also and see what they say.

 

[clownface]

i was thinking, since the 13g donst have a nipple on the compressor housing WTF am i gonna do if thats whats wrong???????????

something else i was gonna try instead of yanking on the actuator arm really hard. i was gonna just run the line i had Ted off the BOV-manifold line straight to the wastegate nipple and not mess with the mbc for now and see if thatll open the wastegate and give me a low boost or not, good idea? bad idea?

i could really use some more feedback on this issue...

 

[jrpmp69]

Originally posted by clownface
i was thinking, since the 13g donst have a nipple on the compressor housing WTF am i gonna do if thats whats wrong???????????

something else i was gonna try instead of yanking on the actuator arm really hard. i was gonna just run the line i had Ted off the BOV-manifold line straight to the wastegate nipple and not mess with the mbc for now and see if thatll open the wastegate and give me a low boost or not, good idea? bad idea?

i could really use some more feedback on this issue...

Why did u put a 13g on your car? Those turbos are very different from the t25, i really dont know anything about those turbos. Those are usually for the twin turbo 3000GT, they might not be compatible with the eclipse. You might wanna check up on that a little more.

 

[siceclipse]

carefully take the MBC apart and reset the balls on the spring. they might not be seated correctly. if this fails, get an new MBC.

 

[clownface]

Originally posted by jrpmp69
Why did u put a 13g on your car? Those turbos are very different from the t25, i really dont know anything about those turbos. Those are usually for the twin turbo 3000GT, they might not be compatible with the eclipse. You might wanna check up on that a little more.

nah, the 13g also came stock on automatic 1st gens, so there not that much different, only big thing is the outlet is the kind that needs a J pipe. Its actually a better turbo then the T-25, better then the t-25 but not as good as a 14b. Its just like a 14b from a 1st gen but a tad smaller. I plan on going 14b soon, then after a while i plan on going up to a 600hp+ turbo, way down the road.

 

[clownface]

Originally posted by siceclipse
carefully take the MBC apart and reset the balls on the spring. they might not be seated correctly. if this fails, get an new MBC.

okay cool ill try that, but can someone explain that alittle more? i dont wanna take it apart and just be confused as to what i need to do.

 

[clownface]

i emailed joep and he told me to check and see if the top ball had fallen off the spring from over tightening it and it going into the side part, well i checked it and thats what had happened, once i fix it ill get back to this thread and tell if it works now or not.

 

[clownface]

update, i took the mbc off and so i can fix it but didnt get around to it so i just ran the T off the bov vaccume line to the wastegate to see if the wastegate even works....and it does....boosting at nice safe 10psi now. once i fix my MBC ill get it on there and try and get it to 15psi, ill post back if i can fix my MBC.

 

[2GeNTSi]

I haven't had time to try using the discharge nipple on the compressor so I cannot say if it works yet.

 

[clownface]

fixed it, it was the MBC, i tightened it up to much and it made the spring and ball go into the side outlet, but i took it apart and fixed it and now its working.