MBC and ATP BCD

[laloosh]

ok my turbosmart mbc is sitting next to me going haha you cant install me untill the atp bcd arrives. i just want to go over the basics here for those that have installed it.

pull the battery and tray, locate WG actuator, pull lower hose, attach that hose to the mbc, from teh mbc attached the hose back onto the lower wg actuator. Remove upper wg actuator hose and cap it? Where does the other end of this hose go? This is where im a little lost. like i said i havnt seen the lines, im just oing based on what i've read. As for the atp, its simply so i have no questions about this.

all imput is greatly appriciated as i am doing this sometime this weekend

 

[Craighjr]

Hey I don't have that set up but I had a thread going where this idea was put out there. I believe for a mbc you only need to put it right in the line to the waste gate. Unless your mbc has more than 2 ports I would imagine you leave the upper line alone. You have a boost gauge right? If you don't I would obviously not install that yet.

 

[Jays07MS3]

pull the battery and tray, locate WG actuator, pull lower hose, attach that hose to the mbc, from teh mbc attached the hose back onto the lower wg actuator. Remove upper wg actuator hose and cap it? Where does the other end of this hose go? This is where im a little lost. like i said i havnt seen the lines, im just oing based on what i've read. As for the atp, its simply so i have no questions about this.

all imput is greatly appriciated as i am doing this sometime this weekend

We have TWO wastegate actuator hoses??? I didn't know that. Why would there be 2? On my eclipse there was only one and as Craighjr mentioned, I just ran the MBC inline with that hose as close to the actuator as I could get. One tip is to try and minimize the total tubing length as much as possible to help get better response and minimize boost spikes.

But I'm curious as to why there are 2 hoses going to the wastegate actuator. When the boost pressure is greater than the MBC spring force, the pressure travels to the wg and pushes on the diaphram, overcomes the wg spring force and actuates the lever arm. When the MBC is closed, the wg spring forces the lever arm closed.

 

[laloosh]

We have TWO wastegate actuator hoses??? I didn't know that. Why would there be 2? On my eclipse there was only one and as Craighjr mentioned, I just ran the MBC inline with that hose as close to the actuator as I could get. One tip is to try and minimize the total tubing length as much as possible to help get better response and minimize boost spikes.

But I'm curious as to why there are 2 hoses going to the wastegate actuator. When the boost pressure is greater than the MBC spring force, the pressure travels to the wg and pushes on the diaphram, overcomes the wg spring force and actuates the lever arm. When the MBC is closed, the wg spring forces the lever arm closed.

from the info that ive gathered, btw there is nothing on the ms3 boards, if you actaully want answers you need to search the ms6 boards. The upper hose on the wg connects to the stock boost selanoid, the lower hoses connects directly to the turbo. you need to cap the stock selanoid and the upper hose and run the mbc on the lower hose, pretty much T it in.

 

[justa4banger]

Just fyi for those that want to know, (I DO NOT KNOW IF THIS APPLIES TO OUR CARS) i have seen actuators with 2 nippels. one in the normal position for boost and one on the other side of the diaphram for vaccume. The idea is that the vaccume line would help pull the actuator closed doing cruise. WHY hell if i know i know i just seen them like that.

Now as far as a mbc install on a MS3, i dunno if that would be the smartest thing. defineitely get that thing on a dyno or get a WBO2 to make sure your not running lean in any area of the rpm band with the MBC.

 

[shucky]

Laloosh, you get this setup up and running? Just curious how its working out for you ... -Mike

 

[laloosh]

the atp bcd is int eh mail. It should be done monday.

 

[speed3shon]

would this be a way to get around the limited power in first and second?

since the power is limited by running lower boost? or would it cause problems in those gears since they are fueled for much less boost...?

 

[Craighjr]

would this be a way to get around the limited power in first and second?

since the power is limited by running lower boost? or would it cause problems in those gears since they are fueled for much less boost...?

No the throttle plate closes to slow down the spool and limit overall boost

 

[laloosh]

No the throttle plate closes to slow down the spool and limit overall boost

actually i think it will change the boost limit. THe map is incharge of the boost limit, if the map is fooled thinking its reaching xxx pressure, when in fact its reachign a higher pressure it will raise the boost in all gears

 

[shucky]

You should no longer have boost limited in 1st and 2nd when using the mbc and atp bcd. The throttle plate will close no more or no less than when stock. I dont believe the throttle plate closes to control boost. For example, if you roll on the throttle in 1st or 2nd gear perhaps 1/2 throttle or more (not floored) you will still reach your maximum limited boost in those gears. How could the throttle plate be closing at "part throttle" to reduce/limit your boost in 1st and 2nd? ECU is controlling boost via the factory solenoid. I dont think you'll have an issue Laloosh, and quite honestly others have already done this and reported full boost, so I dont know why people are questioning it at this point. Let us know how it feels when your done, good luck ...

* understand if you have your mbc set for 18 psi you may not hit 18 psi in 1st gear, maybe not even 2nd gear simply because there may not be enough load to do so. Tune your mbc in 3rd or
4th gear to set maximum psi.

 

[Craighjr]

You should no longer have boost limited in 1st and 2nd when using the mbc and atp bcd. The throttle plate will close no more or no less than when stock. I dont believe the throttle plate closes to control boost. For example, if you roll on the throttle in 1st or 2nd gear perhaps 1/2 throttle or more (not floored) you will still reach your maximum limited boost in those gears. How could the throttle plate be closing at "part throttle" to reduce/limit your boost in 1st and 2nd? ECU is controlling boost via the factory solenoid. I dont think you'll have an issue Laloosh, and quite honestly others have already done this and reported full boost, so I dont know why people are questioning it at this point. Let us know how it feels when your done, good luck ...

* understand if you have your mbc set for 18 psi you may not hit 18 psi in 1st gear, maybe not even 2nd gear simply because there may not be enough load to do so. Tune your mbc in 3rd or
4th gear to set maximum psi.

Thats cool if thats how it is, I was unaware. I am refering to the datalogs from AMS ((maybe)deffinatly) showing the throttle postion jumping all over even thought the pedal is to the floor.
See Here.

 

[tru-boost]

to address the throttle plate observation,
it does not actually control boost. what it does is prevent the turbo from over working itself. it will allow the turbo to slow down and not get huge boost spikes, like small fast spooling turbos like to do. limiting the flow into the TB will reduce the air exiting the motor creating less turbo load. it can use the TB to reduce boost IF the MAP sensor reads to much boost however. it acts like a failsafe. it isnt tuning itself with the throttle plate, it will reduce flow if it thinks there is a problem though.

 

[laloosh]

Well my the atp unit arrived today. I have zero time to install it this wekeend. I got a wedding tomorrow, jets dolphins game sunday, so i will messs with this on monday. True boost do you knwo the size caps i need to cap the wastegate and stock boost selanoid?

 

[oskinosmee]

Where do i find a ATP BCD and how much is it?

 

[laloosh]

www.atpturbo.com its for the ms6 but it will work for the ms3 it was 75 bucks

 

[shucky]

Tru thanks for explaining!

 

[oskinosmee]

www.atpturbo.com its for the ms6 but it will work for the ms3 it was 75 bucks

Yea thanks let us know how yours turn out

 

[dannewitzm]

I have the Profec S installed with the ATP and I'm holding 18psi no prob in 3-6th on the low setting, 20 psi on the high side. Just an FYI- we've run 12 dynos trying to find the sweet spot for a MBC, and anything over 20 psi, our turbo craps out. I cant say for the T-type MBC, but for the GReddy, we used the bottom hose to the new solenoid, and then to the MBC (in cabin), and simply capped the hose off the turbo. Think of it as re-routing a hose for water. You're by-passing the stock actuator with a new one (the MBC). Its a pain to get the bottom hose on there, but I've been nothing but happy with the MBC.

 

[shucky]

What did you dyno?