Small MBC problem

[Mr Bognor]

Going on from my other post i have removed the bleed valve and replaced it with a GTS-Chris MBC ( see pic below ) .

I have installed this as per the installation that came with the kit and have blanked off the right hand side of the actuator and also the pipe that came off the right hand side .

The car would boost to 0.9 BAR with the bleed valve and the actuator connected but now the car will boost to 1.2 and keep going if i do not come off the throttle .

I have the MBC turned all the way out so this should be less boost but still goes past 1.2 BAR this does the same if i turn it all the way in clockwise ?

All i have done is clip one coil of the spring inside the MBC and that’s it .

I have been told to tape the threads but would this help .

Any help would be great

Thanks

Alan

[Marf]

Got it the wrong way round? If you do then the boost will simply rise and rise because the wastegate won't open.

[Mr Bognor]

Do you mean the pipes on the MBC the wrong way round ?

Alan

Got it the wrong way round? If you do then the boost will simply rise and rise because the wastegate won't open.

[Marf]

Yes...

[Ryan S]

the crudely drawn arrow should go to the turbo, the other end goes to the actuator

[Mr Bognor]

Ok well thats one out of the way as the arrow on the pic is going to the turbo and the bottom pipe going to the actuator .

Alan

the crudely drawn arrow should go to the turbo, the other end goes to the actuator

[Marf]

If you're getting unrestricted overboost regardless of MBC screw position then one of three things is true

1. wastegate stuck closed.
2. MBC installed backwards/incorrectly.
3. MBC is shít.

[Mr Bognor]

1. wastegate stuck closed. = Was fine yesterday with the old bleed valve
2. MBC installed backwards/incorrectly. = looks good from the pic and pipes blocked up correctly
3. MBC is shít. = its a GTS CHRIS one but will try some things ( tape thread and cut spring )

Alan

If you're getting unrestricted overboost regardless of MBC screw position then one of three things is true

1. wastegate stuck closed.
2. MBC installed backwards/incorrectly.
3. MBC is shít.

[Marf]

If you take out the MBC and join the two pipes together, how much boost do you get?

[Mr Bognor]

Will have a play with the spring first then i will take the MBC out and check .

Thanks

Alan

If you take out the MBC and join the two pipes together, how much boost do you get?

[Ryan S]

as per our conversation mate, the GTS chris controllers aren;t great out of the box, i;ve had a few and everyone of them has needed modified, they are great once sorted

[Mr Bognor]

Plumbers tape on order and will have another look at the spring .

have cut a small coil off but will have a look and play .

so if there is too much spring is this the problem as i thought untill you turn the knob this will not get compressed .

Alan

as per our conversation mate, the GTS chris controllers aren;t great out of the box, i;ve had a few and everyone of them has needed modified, they are great once sorted

[Ryan S]

in my case yeah, there was just too much spring inside, it was all squashed up and probably not acting the way a spring should (springy, incase you wondered ), so i cut mine, then stretched it slightly, it's been on my old car about 7 years and held 14psi solid for that whole time

[Slarty]

It could well be that the spring is a little too strong as standard. If all the other advice hasn't helped, try cutting a coil or two off of the spring and see where you go from there.

[Mr Bognor]

Here is a pic of the spring with one small coil cut off

What do you think ?

[Slarty]

Here is a pic of the spring with one small coil cut off

What do you think ?

Image Replaced With URL For Quote [url]http://i298.photobucket.com/albums/mm273/kaveney_photo/WP_20140401_0041_zps80b9fff3.jpg[/URL]

sorry fella, I couldn't say off hand, it's been over a year since I've owned a '2 lol. Just try it and see. Start off with the screw wound out as far as is safe and see if the boost holds at a sensible level.

[Mr Bognor]

All sorted

Plumb tape and cut and stretched the spring to make it less spring e .

checked the little hole and re assembled and on the drive to work with the knob turned anti clockwise was reading 0.6 bar

Just need to set this up now to 1.15 BAR and we are all done .

Regards

Alan

[Ryan S]

should work fine mate, mind it's clockwise for more boost, anti clockwise for less, if you're still having problems, check the actuator is working ok etc....

[Mr Bognor]

Yeah think it is all good now just need to turn it clockwise to get it to 1.15 BAR .

Alan

should work fine mate, mind it's clockwise for more boost, anti clockwise for less, if you're still having problems, check the actuator is working ok etc....