Armchair diagnostics on boost issues anyone?

[wintertidenz]

Hmm very interesting - sounds like I might need to get one of those red tipped pipes as well. I'm only seeing 5 psi boost after removing the MBC.

Does anyone have a picture of the restrictor?

[jjayokocha]

i seem to be having the same problem, ever since my std pipes were replaced with silicone hoses i am only seeing a max of 0.5 bar, have checked bout 10 times now and i dont have any leaks

[lathiat]

jjayokocha: Do you have both vacuum lines running correctly off the throttle body elbow? There's one for the fuel pressure regulator and one for the wastegates.

wintertidenz: you likely didn't plumb the electronic boost solenoid back in.. it hides underneath a pile of wires in the area .. if you just bypassed it, 5psi is expected.

[jjayokocha]

i was getting 0.8 when i got the car but the front turbo needed replaced. The used 1 i got looked in good cond and no smoke. I thought maybe something isnt sealed so i have a leak. When i hit 0.5 i get a rattle then car changes gear

[wintertidenz]

The car was actually missing the solenoid and red tipped pipe when I got it - it's all plumbed back in correctly and the pipes have no holes in them.

[Nick Mann]

I tracked this down recently, thought I would share the solution just in case it helps anyone.....

The boost solenoid didn't seem to be working (although I wasn't certain of a test to do to prove if it was or not) and I didn't have a good solenoid in my parts bin. What I did have were two solenoids with broken pipe nipples. I took one of those apart ans as it seemed to be a simple mechanism, so I then took apart the solenoid from my car and swapped the black plastic section with the pipe nipples to the other solenoid. I was running out of time to try testing the newly-built-from-2 solenoid as I had to collect the kids, so I just reassembled the engine bay and drove off to get them. I can now get over 1.0bar of boost, so I am pretty sure the solenoid was at fault. I don't know how much I can get yet, as the AFR's go well up into the 12's as I get over 1.0 bar. Fuel pump and FPR are next on my to do list!

[foxdie]

Glad you got this sorted.

Do you want my help in tuning it again or are you gonna do it yourself?

[Nick Mann]

I'm not going to tune it again until I have installed the pump and fpr. Then I'll have a go and see if I can get ecuflash working. Maybe if you want to try the gearbox thing at some point I'll get you to show me the ropes.