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Home > Help Needed / General Tech Chat > No boost

nala56

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Sheffield South Yorkshire GB.

Test driven car today, and where getting no boost, Is there any other test we can do to check if turbo is spinning, no misfires on engine, seems to drive like a normal 1275, without a turbo, boost gauge
Showing no boost, dump valve not blowing off, could it be the actuator, thanks for your help..Alan

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Tom Fenton
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Take off the hose coming from the turbo to the plenum, rev the engine up and you should feel a good whoosh of air coming out of the pipe, hand dryer in toilets kind of amount. Can you move the actuator rod by hand, it should have spring loaded pressure, but you should be able to grab it and move it. Also have you fitted the actuator with pre load, you should have to pull the rod approx 3 to 4mm to get it to fit over the wastegate arm pin.


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


nala56

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825 Posts
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Sheffield South Yorkshire GB.

Hi Tom just going to check the turbo to see if it is blowing air up

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nala56

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Right I've unbolted the aloy pipe and its not blowing so I guess the turbo is done and needs replacing

Sucks up nice but no blow lol

Thanks Tom

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matty

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Aylesbury

Is the inlet restricted to the turbo?

If the wastegate is stuck open you'll probably get very little boost.

Take the inlet off the turbo and see if you can rotate the shaft or feel any play.

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1/4mile in 13.2sec @ 111 terminal on 15psi


Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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Rotherham South Yorkshire

You need to rev it fairly hard, but it should be blowing. Can you spin the impellor with your fingers through the inlet on the compressor housing? You should be able to spin it quite easily.


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


nala56

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Sheffield South Yorkshire GB.

I've just rev it high realy high and you can just feel a small amount of air so I'm going to check how easy the impellor spins.
But its not def not pushing enough air out

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John

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Maybe the turbo is seized.

If something is worth doing, it's worth doing half of.


BENROSS

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is the actuator stuck open ?

even so you should end up with some of air coming out






nala56

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OK I’ve striped the turbo off the engine and I can see nothing wrong, there’s no end float and It spins freely with slight restriction, took some pictures for you to look at.. Alan








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Carlzilla

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Echoing everybody else, check the actuator, they should pull out with a bit of pressure, if its very easy to pull out it's no good, or the diaphragm in it may be split?

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


nala56

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Sheffield South Yorkshire GB.

When you blow air into the actuator It opens..


On 3rd Mar, 2012 Carlzilla said:
Echoing everybody else, check the actuator, they should pull out with a bit of pressure, if its very easy to pull out it's no good, or the diaphragm in it may be split?

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Carlzilla

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Did you blow air into it with your nouth?
If you did that sounds like a weak actuator to me, although i could be wrong, i have a t3 actuator and an avonbar actuator in the garage, I'll see what it does!

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


nala56

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Sheffield South Yorkshire GB.

No I used my air line..

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nala56

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Sheffield South Yorkshire GB.

Just tried to blow It by mouth, but you can only feel it move slightly but not open..

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Carlzilla

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I just went out to look at mine, took a fair bit of pressure to pull out the standard actuator by hand. What's yours like? The only other thing i can think of is the hose bore to the actuator not being big enough maybe?

Couldn't move mine in the slightest blowing into the actuator.

Edited by Carlzilla on 3rd Mar, 2012.

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


nala56

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825 Posts
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Sheffield South Yorkshire GB.

With the engine running, put your hand over the intake when rev It, nearly pulls your hand
inside *laughing*

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matty

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Can you take a pic of how the actuator arm sit in comparison to the waste gate pin. Basically what the preload looks like?

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1/4mile in 13.2sec @ 111 terminal on 15psi


Carlzilla

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Quarry Bonk

As far as i'm aware, you should have to pull the actuator arm about with width of the pin to pull it onto it, about 4-6mm short of it dropping right on with the wastegate closed.

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


nala56

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825 Posts
Member #: 9661
Post Whore

Sheffield South Yorkshire GB.

Can’t take a pic at this stage, because I’ve striped it down, but when I first put the turbo on the engine, I was told there was too much presser on it, so made it like my sons turbo mini, just pulling it closed with slight presser.. Alan

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Carlzilla

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Quarry Bonk

If you can move it with the pressure of blowing on it, I'm guesing the spring has weakened, and if you have barely any preload it's not going to do much anyway!
Try making the arm about 5mm short of sliding over the pin with the wastegate closed, and see how it goes from there.

Edited by Carlzilla on 3rd Mar, 2012.

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


nala56

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825 Posts
Member #: 9661
Post Whore

Sheffield South Yorkshire GB.

I think i may be giving the wrong impression, It will no move open by mouth, I used my air line to move It..

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matty

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8297 Posts
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Turbo Love Palace Fool

Aylesbury

What Carl said. ^^^

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi


Carlzilla

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Quarry Bonk

If 5mm preload doesn't suss it, try asking one of the local lads to pop round and take a look at it, there's plenty turbo nuts about in Yorkshire!

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


nala56

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825 Posts
Member #: 9661
Post Whore

Sheffield South Yorkshire GB.

Got no where nere 5mm preload, just taking a picture of it, will post in a short while..

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Upgrade to Turbo
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