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Thread: Lpt mbc

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    Lpt mbc

    Just fitted an mbc to my 850 AWD with the LPT engine. Got it boosting to around 9-10psi at the moment, and wow what a difference it makes!

    Just thought I would report on my experience for the LPT owners, as there's not much info about mbc's fitted to these engines.
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, cold air con. Follow the project here
    1996 Nautic Blue 850 AWD - The daily, resisting the urge to modify

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    Sounds great but wot is a mbc ??????
    Cheers Mark..........
    EBC DRILLED GROOVED DISCS. EBC GREEN STUFF PADS. AIR CON REMOVED. TWIN EXIT EXHAUST. BLACK MESH GRILLE.GREEN PAPER AIR FILTER. FRONT SPLITTER. POLY TOP BUSH.V70 REAR LAMPS
    The greatest trick the Devil ever pulled was convincing the world he didn't exist
    http://www.r2rc.co.uk/landing/index.htm

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    Manual Boost Controller mate...
    Alastair
    Current: 2009 Cayenne GTS and a 2016 Prius IV... yes.
    Previous Volvos: 2009 V50 D5 R-Design, 2005 V70R, 2001 V70 T5, 2001 S40 T4, 2x 1999 S40 T4, 2003 V40 T4, 1999 V70 T5, 1996 854 T5 & 855 T5, 1995 855 T5, and a 480...
    Previous other stuff: Saxo Turbo, 2004 996 C4S, 2008 Z4M, 2001 Yaris T-Sport, 2002 S2000 Mugen, and a 1999 Evo VI



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    flyingbrick (Thursday 19th February 2009)

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    Manual Boost Controller
    Last edited by Dangerous Dave; Thursday 19th February 2009 at 00:27.
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, cold air con. Follow the project here
    1996 Nautic Blue 850 AWD - The daily, resisting the urge to modify

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    flyingbrick (Thursday 19th February 2009)

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    Beat me to it Al LOL
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, cold air con. Follow the project here
    1996 Nautic Blue 850 AWD - The daily, resisting the urge to modify

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    flyingbrick (Thursday 19th February 2009)

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    Talking

    Ye I knew that only kidding..... LOL and more LOL............
    Last edited by flyingbrick; Thursday 19th February 2009 at 00:21. Reason: sorry cant spell
    Cheers Mark..........
    EBC DRILLED GROOVED DISCS. EBC GREEN STUFF PADS. AIR CON REMOVED. TWIN EXIT EXHAUST. BLACK MESH GRILLE.GREEN PAPER AIR FILTER. FRONT SPLITTER. POLY TOP BUSH.V70 REAR LAMPS
    The greatest trick the Devil ever pulled was convincing the world he didn't exist
    http://www.r2rc.co.uk/landing/index.htm

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    Talking

    Current Volvos: ONLY ONE! 2001 S40 T4 (built engine, tuning pending...) Previous Volvos: 2x 1999 S40 T4, 2003 V40 T4, 1999 V70 T5, 1996 854 T5 & 855 T5, 1995 855 T5, and a 480...

    Sorry but I have to say you have a volvo fetish and I think its great.......
    Cheers Mark..........
    EBC DRILLED GROOVED DISCS. EBC GREEN STUFF PADS. AIR CON REMOVED. TWIN EXIT EXHAUST. BLACK MESH GRILLE.GREEN PAPER AIR FILTER. FRONT SPLITTER. POLY TOP BUSH.V70 REAR LAMPS
    The greatest trick the Devil ever pulled was convincing the world he didn't exist
    http://www.r2rc.co.uk/landing/index.htm

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    what type did you use bomb?

    ive seen a few mbcs on the market, some fancy 3 piece 'turbosmart' types ones, which i dont fully understand, and then the other, dead simple 'interupter' pressure release jobbies.

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    Quote Originally Posted by flyingbrick View Post
    Current Volvos: ONLY ONE! 2001 S40 T4 (built engine, tuning pending...) Previous Volvos: 2x 1999 S40 T4, 2003 V40 T4, 1999 V70 T5, 1996 854 T5 & 855 T5, 1995 855 T5, and a 480...

    Sorry but I have to say you have a volvo fetish and I think its great.......
    LOL dude, guilty as charged

    Quote Originally Posted by 1996 850 T5 View Post
    what type did you use bomb?

    ive seen a few mbcs on the market, some fancy 3 piece 'turbosmart' types ones, which i dont fully understand, and then the other, dead simple 'interupter' pressure release jobbies.
    I'm using an Rspec mbc, with only the two ports on it, the three port valves are bleed valves, which people have said say are not the way to go.

    http://www.rspec.co.uk/index.php?mai...roducts_id=206

    I have to say, the company have an excellent customer service, as I bought the wrong valve, and they exchanged it within a day of me sending it back!
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, cold air con. Follow the project here
    1996 Nautic Blue 850 AWD - The daily, resisting the urge to modify

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    yep, same as mine, so simple!

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    If anyone wants a two port MBC i have 2 here brand new never fitted they are available for cost of postage

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    Quote Originally Posted by MrMopp View Post
    If anyone wants a two port MBC i have 2 here brand new never fitted they are available for cost of postage
    would be very interested in relieving you of one of those



    I also assume a boost gauge is a must, bomb don't suppose you could do me a quick how to with the parts required... and there was me saying I wouldn't modify the 850!
    Last edited by 888dee; Thursday 19th February 2009 at 19:38.

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    Quote Originally Posted by 888dee View Post
    would be very interested in relieving you of one of those
    PM your address mate and ill post it out then give you a shout with cost

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    Quote Originally Posted by flyingbrick View Post
    Current Volvos: ONLY ONE! 2001 S40 T4 (built engine, tuning pending...) Previous Volvos: 2x 1999 S40 T4, 2003 V40 T4, 1999 V70 T5, 1996 854 T5 & 855 T5, 1995 855 T5, and a 480...

    Sorry but I have to say you have a volvo fetish and I think its great.......
    LOLvo
    Alastair
    Current: 2009 Cayenne GTS and a 2016 Prius IV... yes.
    Previous Volvos: 2009 V50 D5 R-Design, 2005 V70R, 2001 V70 T5, 2001 S40 T4, 2x 1999 S40 T4, 2003 V40 T4, 1999 V70 T5, 1996 854 T5 & 855 T5, 1995 855 T5, and a 480...
    Previous other stuff: Saxo Turbo, 2004 996 C4S, 2008 Z4M, 2001 Yaris T-Sport, 2002 S2000 Mugen, and a 1999 Evo VI



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    I have fitted a set of clocks from an 850 T5 which have the boost gauge built in. Obviously its not very accurate, but at least I know that if it goes off the end of the white strip then I'm in trouble LOL.

    Here's a step by step to go with these diagrams




    1) disconnect the blue pipe from the air intake pipe and then plug hole on the intake pipe it comes off

    2) disconnect the green pipe from the control valve and connect it to the bottom of the mbc (or the port where the ball and spring presses against)

    3) disconnect the yellow pipe from the control valve and connect it to the other port on the mbc

    4) leave the wiring loom plugged in to the control valve as the ecu will throw a code otherwise

    5) secure the mbc to something (i cable tied mine to the upper engine mount for easy adjustment) and cable tie the pipes to the mbc (dont want them coming off)

    6) now comes the tricky bit. You have to adjust the mbc to the pressure you want. Now the way I did it was to unscrew the mbc control knob til the spring was just pushing on the ball, take the car out for a drive and see what it boosts to (obviously get a gauge fitted first LOL), then adjust the mbc up from there 'til the desired boost is achieved.

    I've got mine set around 9-10psi (from what I can gather from the standard gauge).

    Now there are some things you have to be aware of, I'm not sure what will happen if you go pedal happy from low revs. I've not gone WOT in 2nd/3rd until around 3K rpm, as you know, our turbos spool up faster than a bigger turbo, and with our higher compression engines too much boost at low revs will give you some banana shaped rods and a huge headache!

    Must report though that the power now doesn't die off at 4000-4500rpm, it just keeps coming. Haven't had the chance yet to do motorway testing, so don't know what its like holding the power down.

    Also, I've experienced a drop in mpg down from 19-20 to 15-17, though don't know whether this is due to my heavy right foot and smile, or something else.

    HTH, give me a shout if you've got any questions.

    Bomb
    Last edited by Dangerous Dave; Thursday 19th February 2009 at 20:20.
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, cold air con. Follow the project here
    1996 Nautic Blue 850 AWD - The daily, resisting the urge to modify

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    flyingbrick (Sunday 22nd February 2009)

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    Quote Originally Posted by 888dee View Post
    and there was me saying I wouldn't modify the 850!
    Me either to an extent, but I was just not happy with the lack of top end grunt, but this seems to make up for it, I have a HUGE grin every time I press the loud pedal, it gives you such a kick in back.

    BTW the max pressure that the 13G turbo will achieve is around 17psi

    Like I said before please, please, please be careful, as it can all end in tears.
    1996 Olive Green 850 AWD - Forged rods, VXR injectors, 19T, Ostrich 2.0, cold air con. Follow the project here
    1996 Nautic Blue 850 AWD - The daily, resisting the urge to modify

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    brill bomb, and yes I know all about the pitfalls of turbo engines and excessive boost, seen my share of blown up cossies and rs turbo's...

    need a boost gauge now

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    You can just fit the MBC in the red line from the BCV to the turbo with the BCV still connected. You won't have to disconnect anything then, just fit the MBC in the vac pipework.

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    alan, forgive my ignorance but would leaving the stock boost control valve connect not limit you to the original level of boost?

    or does the BCV allow the boost continue to rise until a certain level of vac is attained?

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    Quote Originally Posted by 888dee View Post
    alan, forgive my ignorance but would leaving the stock boost control valve connect not limit you to the original level of boost?

    or does the BCV allow the boost continue to rise until a certain level of vac is attained?
    yeh im 99% sure ur right mate, wouldn't matter how cranked up the mbc is because the bcs will just limit it to stock levels.


 

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