No boost at all .

**daddy cav** · 27-10-2006 20:06

Just fitted recon turbo and did about 50 miles and set boost to 1 bar - 14.5psi .
There was a bit of juddering then no boost at all after that

Not even 1/2 a psi - just stops on gauge from idle to 0 boost .

Taken downpipe off and used a footpump and watched the wastgate opening and shutting and also the blades on turbo spin fine ........I dunno .

The actuator moves a fair bit by hand but saw it opening and shutting wastegate and it's a Courtenay one and fairly new .

There are no pipe leaks and car runs and drives fine just no boost .

**Astra Dan** · 27-10-2006 20:21

worth changing the actuator for the one off your old turbo in case theonw you have is weak?

**Adam** · 27-10-2006 20:33

how old is recon as u suppsoe to gradually settle them in ugg

**spanishfly** · 27-10-2006 21:27

You got Vacuum tubes plumbed in correctly right?

**daddy cav** · 27-10-2006 21:50

Originally Posted by spanishfly

You got Vacuum tubes plumbed in correctly right?

Taken pipe off actuator as a test and still nothing at all .

Not sure on actuator but taking pipe off rules that out .

Turbos don't need running in .

**daddy cav** · 27-10-2006 22:51

So in theory if the actuator is taken off then the engine should boost to infinity and beyond ?

**xeman** · 27-10-2006 23:08

taken off or the feed pipe disconnected?

**daddy cav** · 27-10-2006 23:11

Originally Posted by xeman

taken off or the feed pipe disconnected?

Taken off has the same effect as no pipe so yeah either I spose .

Taken off wastegate valve permanantly shut anyway I reckon .

**xeman** · 27-10-2006 23:16

I have never had no boost whatsover on a LET but have on other cars and if there was a boost leak on the inlet side you could REALLY hear the turbo spinning and the pressure escaping

**daddy cav** · 27-10-2006 23:19

Hmm nope nothing like that - no pressure escaping noises at all , infact drives just like a usual lower powered car ..fine but no boost .

**Tathan** · 27-10-2006 23:41

If it drives lack that with no vac onto the wastegate then the wg is either leaking (look for a poor fitting penny valve [or missing!], or the arm moves freely), a big hole in the casing (obvious) or the turbo isn't spinning up due to resistance on the shaft.

**daddy cav** · 27-10-2006 23:44

Originally Posted by Commander Keen

If it drives lack that with no vac onto the wastegate then the wg is either leaking (look for a poor fitting penny valve [or missing!], or the arm moves freely), a big hole in the casing (obvious) or the turbo isn't spinning up due to resistance on the shaft.

Yeah man , you see penny valve is fine and wastegate - saw it opening with downpipe off with someone operating foot pump .

Plus spun shaft by hand that's why I'm stumped .

Brand new turbo but it did judder before no boost at all .

**vauxhallparts** · 28-10-2006 08:28

turbo technics turbo

**daddy cav** · 28-10-2006 10:59

I was only boosting at 0.8 bar when car juddered and then no boost .

Before I take the unit off , I have checked wastegate wich is intact and opens and shuts and with pipe off actuator there is 0 boost not even a puff .

Blades spin by hand fine .

There are no air leak noises and car runs perfect but no boost .

Not turbo technics no .

**Tathan** · 28-10-2006 11:09

when you tested it with a footpump, when did it open?

**daddy cav** · 28-10-2006 11:23

Gauge on footpump is crap so not sure but did open and shut ok , was looking at wastegate at the time through the bottom .

An ecu fault can't cut all boost can it ? as the turbo is mechanical it would surely still boost .

**Tathan** · 28-10-2006 11:30

worst ecu could do is run on spring pressure.

Try it with the wastegate disconnected and the actuator wound right up.

**daddy cav** · 28-10-2006 11:49

Will have a play later

The judder before no boost at all is what I can't make out though

**leesturbo** · 28-10-2006 13:08

you say you span the shaft! but did you check the other fan was turning while you turned the exh fan?

**leesturbo** · 28-10-2006 13:10

you would still have boost with the wastegate jammed right open

**spanishfly** · 28-10-2006 14:46

Thats what i'm thinking... a snapped or loose shaft!

**daddy cav** · 28-10-2006 15:09

Both sides of shaft turn together as got someone to check .
So it has to be the new turbo at fault then no ?

There is no shaft damage , it turns but no boost .
I'm even more lost than normal .

**spanishfly** · 28-10-2006 15:12

If both ends of the shaft turn,
you got no problem with the wastegate/actuator,
then engine runs perfectly bar the boost,

You got a big problem?

**daddy cav** · 28-10-2006 15:33

Originally Posted by spanishfly

If both ends of the shaft turn,
you got no problem with the wastegate/actuator,
then engine runs perfectly bar the boost,

You got a big problem?

Hmm , strange problem and annoying .

**leesturbo** · 28-10-2006 15:37

Originally Posted by daddy cav

Both sides of shaft turn together as got someone to check .
So it has to be the new turbo at fault then no ?

There is no shaft damage , it turns but no boost .
I'm even more lost than normal .

i'm stumped because, if your turbo spins freely by hand and both impeller's are connected then its gona spin like a good un , and create some airflow (boost) i would then go to say that you have a boost hose off , but the fact your running a AFM with no tickover/running problems is errrrrr

no boost as in " 0 " ?

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