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+--- Thread: mbc (/showthread.php?tid=25922)
mbc - shaunturner306 - 13-08-2014
I have fitted a mbc to my hdi as it is now front mounted what boost should I be running as standard as I havent mapped the car yet
RE: mbc - ADV_93 - 13-08-2014
13/14 psi, althought may get a drop of 1 or 2 psi if it's FMIC'd
RE: mbc - Slam Wagon - 13-08-2014
shouldnt have a drop at all, should still be feeding the intake the same pressures. may just take a bit longer to boost as theres a larger volume to fill.
RE: mbc - Poodle - 13-08-2014
Theoretically if the intercooler is 100% efficient you wouldn't have a pressure drop, but that's physically impossible lol. 1-2psi loss is about right.
RE: mbc - shaunturner306 - 13-08-2014
I havent run the car since it was fitted at the garage this morning an may have to adjust the mbc as I dont no what boost its running at yet
RE: mbc - Poodle - 13-08-2014
Just wind it all the way out and it'll put all the load on the wastegate, therefore working as normal.
RE: mbc - shaunturner306 - 13-08-2014
Ok thanks
RE: mbc - ADV_93 - 13-08-2014
You don't wanna boost too much or else you'll blow the welds on the intake
RE: mbc - shaunturner306 - 13-08-2014
So whats the best way to adjust the boost with out driving the car
RE: mbc - ADV_93 - 13-08-2014
Best way is to drive to car. If you have a boost gauge installed, set the MBC to it's lowest "-" setting if it has one. Then give it a click, or a turn, then drive off and see what the increase in boost is. If you're still running standard atm, messing with the boost could make the car run funny.
RE: mbc - shaunturner306 - 13-08-2014
The car is standard just getting ready for stage but I dont no how the mbc was set be it was installed
RE: mbc - ADV_93 - 13-08-2014
(13-08-2014, 08:25 PM)shaunturner306 Wrote: The car is standard just getting ready for stage but I dont no how the mbc was set be it was installed
Not a problem, do you know what type of MBC you have had fitted? Can you send a picture?
RE: mbc - shaunturner306 - 13-08-2014
Its a turbo revs one off ebay
RE: mbc - ADV_93 - 13-08-2014
[attachment=18394] Is it this type? If so, the silver bit on the ends twists. If you look on it, it'll have a "+" and a "-" with arrows pointing in the direction. If you twist it toward the "-" but go probably a click or two off the bottom then the mbc will barely have an effect and it will boost off the normal actuator pressure.
RE: mbc - shaunturner306 - 14-08-2014
Thats the one mate in sliver cheers
RE: mbc - Poodle - 14-08-2014
(13-08-2014, 06:31 PM)ADV_93 Wrote: You don't wanna boost too much or else you'll blow the welds on the intake
Never heard of that happening before, who was that?
RE: mbc - shaunturner306 - 14-08-2014
Cars running but its only boosting at 10 psi underload even with mbc open full soundd like theres a boost leak but cant find where its coming from
RE: mbc - Piggy - 14-08-2014
Probably to do with that crap MBC.
Get a decent brass n ball one and you may find it sorts itself
RE: mbc - shaunturner306 - 14-08-2014
Tbh mate the bloke at the garage who fitted it has never a mbc to a diesel an im not sure if its plumbed in right
mbc - Jtrigga - 14-08-2014
(14-08-2014, 05:46 AM)Poodle Wrote:(13-08-2014, 06:31 PM)ADV_93 Wrote: You don't wanna boost too much or else you'll blow the welds on the intake
Never heard of that happening before, who was that?
Brian o conner
RE: mbc - Piggy - 15-08-2014
(14-08-2014, 07:07 PM)shaunturner306 Wrote: Tbh mate the bloke at the garage who fitted it has never a mbc to a diesel an im not sure if its plumbed in right
Serious?!
1) you paid a garage to do it?!
2) he wasnt sure how even though he had done petrols!?
RE: mbc - Poodle - 15-08-2014
(14-08-2014, 10:31 PM)Jtrigga Wrote: Brian o conner
*facepalm*
That went completely over my head.
Not boosting enough is very unlikely to be the mbc at fault, i'm not sure that's even physically possible lol. More likely a boost leak, poor piping or knackered turbo.
RE: mbc - shaunturner306 - 15-08-2014
I havent paid him yet an only found 2 leaks an pipe work is fine an nothing wrong with turbo
RE: mbc - pro_steve - 15-08-2014
If you've got the one from that picture (bleed valve) they have to be plumbed up differently to the normal ball and spring MBCs, here's a simple guide for each type that you can show your garage (I think you have the second type): http://hdi-tuning.co.uk/downloads/MBC-Mechanical-Boost-Controller-fitment-guide.pdf
As for setting up the boost it's not a big deal.
Get your stage 2 map on there then start with the MBC screwed out all the way. Drive the car hard and see what the boost is at. Stop, screw it in a bit then drive again until you get to 20 psi once boost has stabilised.
Don't push much past 20 psi as this it's not beneficial and you'll just end up killing the turbo.