MK1 Leon GT2x Build - thats it folks

[ibizacupra]

you need to verify the pressure it opens on its own.. by pressure pump or connected to charge pipe with nothing else in between OR with N75 plumbed back as it should be.

 

[pj1985]

OR with N75 plumbed back as it should be.

But electrically unplugged Bill?

 

[HTC]

Indeed, N75 plumbed in as factory with no electrical plug, or as mentioned vac pipe from inlet manifold or boost pipe straight to the actuator. Then read off max boost from a boost gauge.

 

[jamiebennett81]

Indeed, N75 plumbed in as factory with no electrical plug, or as mentioned vac pipe from inlet manifold or boost pipe straight to the actuator. Then read off max boost from a boost gauge.

ok so...

plumb in the N75 and return to original state and remove the MBC and also unplug the N75 as well

remove the actuator pipe, and then go out and drive

will see if I get a chance tonight

 

[pj1985]

To find out the actuator pressure have the N75 plumbed in normally but electronically disconnected.

You only want to disconnect and block of the vac line to actuator on a seperate run to see if the turbo can boost over what you have already. But remember be VERY careful if you do this.

 

[jamiebennett81]

To find out the actuator pressure have the N75 plumbed in normally but electronically disconnected.

You only want to disconnect and block of the vac line to actuator on a seperate run to see if the turbo can boost over what you have already. But remember be VERY careful if you do this.

thanks, will do

and if it does not boost over 1.2 bar = Actuator needs adjusting?

 

[RobDon]

With my Apexi switched off my GT2X boosts to 1 BAR of boost, switched on it will boost to whatever I set it to, which is 1.4 BAR normally.

 

[pj1985]

thanks, will do

and if it does not boost over 1.2 bar = Actuator needs adjusting?

With the vac line to the actuator blocked off and it still not making over 1.2bar then it could be the actuator

 

[wild willy]

The actuator spring pressure is only really relevant where boost is controlled by n75 valve. If a mbc replaces the n75 valve then the actuator spring pressure is less relevant since the actuator in the latter case will not see any boost to operate until the pressure that the mbc is set at to open is reached by the turbo. I hope to be proved wrong here but i doubt you'll see a difference in max boost unless your forge mbc is faulty.

 

[ibizacupra]

the question is what its static pressure is.. if N75 could not control it (IF) if was running @ 100% duty cycle when mapped - still not confirmed (and I have lost the will to follow this thread much longer - lol)

Higher the actuators base opening pressure the lower the duty cycle.. too low a pressure and the wastegate could be being blow open by excessive manifold pressure.

the tests, whenever they get done will confirm whats going on..




SO! When the tests going to be done???

 

[jamiebennett81]

With the vac line to the actuator blocked off and it still not making over 1.2bar then it could be the actuator

ok, not sure if I have done this right now

I disconnected the N75 (electronically) and took off the actuator pipe to the N75 as well

so, this would lead to unlimited or uncontrolled boost right?

so took it out for a run, and still its only boosting to 1.1bar exactly

pics below of it disconnected to see if its right?

on the first pic, tied disconnected pipe is pipe from actuator

then onto disconnected N75 is the pipe leading from the TIP and the other from the Intercooler pipe, thats right, if I reconnected the actuator pipe to return to standard form?

so....what next? reconnect the N75 as together as standard and start to adjust the actuator and see if the boost starts to increase?

 

[Damoegan]

You still need to bend the end of the pipe over and put a cable tie round it to actualy block the pipe off mate

 

[jamiebennett81]

You still need to bend the end of the pipe over and put a cable tie round it to actualy block the pipe off mate

ok, off out now to do it then, and will do another test run

 

[pj1985]

You are doing two tests here:

1-N75 with all vac lines connected as they would normally be but with the N75 disconnected electronically. This is give you your actuator pressure.

2- Vac line to your actuator blocked off. It needs to be blocked and not just unplugged. As you know be very careful as you have uncontrolled boost. This will show whether your set up can actually make ore than the 1.2bar it currently does.

 

[ibizacupra]

nothing connected to actuator and still 1.2bar max?
you sure nothings connected to it?

 

[jamiebennett81]

You are doing two tests here:

1-N75 with all vac lines connected as they would normally be but with the N75 disconnected electronically. This is give you your actuator pressure.

2- Vac line to your actuator blocked off. It needs to be blocked and not just unplugged. As you know be very careful as you have uncontrolled boost. This will show whether your set up can actually make ore than the 1.2bar it currently does.

1-N75 with all lines connected, but logging this on VAG com do you men, or just measure it via the boost gauge

2-VAC line is now blocked off, just took it for a test run and it is still only showing me 1.1bar!

 

[jamiebennett81]

nothing connected to actuator and still 1.2bar max?
you sure nothings connected to it?

nope, nothing

as said above, just blocked it off, took it for a run and no change in boost

N75 also unplugged at the same time as well

 

[Damoegan]

It has got to be something mechanical then mate.

 

[jamiebennett81]

It has got to be something mechanical then mate.

I am going to reconnect the N75 as standard and then adjust the actuator.....

 

[Damoegan]

I am going to reconnect the N75 as standard and then adjust the actuator.....

Make sure you count how many turns you move it and which way each time and try with just one or two turns to start with.