Getting ZERO boost, what the hell?!

[Tordy3002]

Helloooooooooooo!

After an evening of driving the car round without any issues I now have no boost, as in ZERO boost. Pinning in up to about 5-5.5k there is nothing, and at one point was even showing negative pressure.

I honestly cant think of what it could be.

Only noticed because I gunned it and only hit 0.9bar, instead of 1.1bar, and then next time there was even less, and now naff all. There werent any nasty noises, bangs, pops, judders or anything. Still idles and revs fine, and drives smoothly so not a boost leak.

Thought the actuator arm may have come off, but all is fine. And its defo pulled tight by the angle of the wastegate arm bit.

Any ideas peeps as Im truely stumped! How can you not get ANY boost what so ever!!

[kam]

Wastegate jammed open?

[SX_BIG]

wait for the 'boost leak' responses that will litter the first and 2nd page until you work out its sumit else.

i dont see how u could read neg pressure whilst under acceleration as there will nto be a vacum if the throttle is fully open.

im gonna have to be gay and say, check ALL pipes and intercooler for holes. sumit couldve flicked up and caught the car.

check actuator isnt stuck open too.

if not, see you saturday and we will sort it.

[kam]

It wont be a boost leak, if it was big enough to cause zero boost, it wouldn't run.

[JJ]

Left your bonnet open over night?

[Tordy3002]

Dont think so, unless its just snapped off completely on the inside like something crazy times!! haha

From the outside it looks cool, actuator arm is on, pulling it tight.



Before Ive driven around with the actuator arm not even attached so the wastegate so just flapping around and then I still could get 0.3bar eventually. Now it is literally shag all!

Exhaust turbine is bits?? Just surely I would have felt something??

[Tordy3002]

Left your bonnet open over night?

lol, ah yeah, its been nicked! haha

[JJ]

Ignore me...am drunk

What happens if you push the wastegate arm back and forward mate?

And take that suction pipe off and feel in the turbo, perhaps your turbo is just frakked/stuck.

[Tordy3002]

It wont be a boost leak, if it was big enough to cause zero boost, it wouldn't run.

Agreed not a boost leak. Had hoses come off before and its completely different. Splutter splutter not run/idle for buggery!

[Tordy3002]

Any more ideas peeps??

[weegaz22]

As suggested pull off the intake pipe and check the turbo is spinning, check for excess play in turbine shaft, then pull off actuator arm and check movement of wastegate is free and moving full range

[niko86]

i know, its unlikely for you not to notice, but maybe the boost gauge is faulty or not connected probperly?

[Tordy3002]

Defo not the boost gauge, is crazy slow. Like a 2.0l, just with a dead turbo stuck in the way! haha.

On the way back I floored in third onto the dual carriageway, and there was NOTHING upto about 5.5k, but then wouldnt accelerate any further.

Then, nearly to home, I got boost! Wooo, but really late and wasnt the full amount. Then sitting as traffic lights, idling fine, the idle then dropped suddenly and recovered, but was then no boost again.

Im thinking wastegate flap is dicking about again. Had the problem of the weld that holds it in place breaking and the wastegate catching on the housing. After a bit of dremel work boost was the best ever. 1bar at under 3k on a standard turbo I thought was pretty good!

Ill have to have a play later, thanks for the replies!!

[OdEssA]

Wastegate jammed open?

+1 I had this before, its cheap to fix but you need to remove the turbo to solve it

[Tordy3002]

Yeah I guessed as much! Will be the 6th time in 8months the turbos been out hahaha, you'd think it'll be a 6sec job by now but no! haha

[Mark]

When warm take the compressor housing pipe off (the alloy bit held on with 2 nuts) and see if the turbo spins freely by hand.

[sideways14a]

Its unlikely to be a jammed puffer as you would think it would not start at all, and would prob glow red hot or something. Could have sheered the compressor off though lol
If the wastegate was jammed open you might expect to see some boost high up the range.

I recon its a boost leak

[kam]

Yeah, it wont be a seized turbo.
This would be the worst boost leak ever

[Jonnay]

my old t28's shaft snapped in 2, on my old 14, it made no noise at all, started and drove ok with no missing/juddering, it was just very slow, wasn't until I got it off I realised that both ends span independantly of each other hope it's not that.. but it sounds the same as what mine did.. new tubby time obviously..

[Mark]

Its unlikely to be a jammed puffer as you would think it would not start at all, and would prob glow red hot or something. Could have sheered the compressor off though lol
If the wastegate was jammed open you might expect to see some boost high up the range.

I recon its a boost leak

Oh it will start and run perfectly normally expect for having no go

I had a 28r that when cold would spin fine but as soon as you started the car and it got a bit warm jammed solid took me fooking ages to work it out

Car was smooth and idled ok, just had no balls and boost guage obviously went to 0 and stopped