No boost
Turbo Mini Forums

Hi everybody,

I just finished to build my mini turbo with a metro turbo engine.
I did my first tests today.
My car starts but when I accelerate I do not feel the turbo. I have no boost and the needle of the manometer turbo do not move.
My first idea my turbo is dead but that is strange it is I hear the turbo to whistle, thus I suppose that it is well-funtionning.
Anybody would have an idea?

Are you driving the car or just reving it on the driveway. If it is the latter you will not make any boost.

Take off a pipe from the compressor and give it a good rev and put your hand over the pipe. You should be able to feel the air being pumped, just not enough to register on a gauge.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Hi Ben,
At the beginning of my tests I accelerated, gear in neutral position, while in my garage to rev it.
Given that I heard the compressor whistle but no movement in the manometer I tested it on the road and really reved it, but no boost …
When you say:” take off a pipe from the compressor”, you mean the pipe which connects the actuator?

No. The one which feeds the carb.

In the 13's at last!.. Just

I think it’s blows in this place because I have a dump valve between the pipe of the compressor and the plenum and we hear the “pchiiiit”.
I shall all the same test to remove the pipe to see.

If the air being pumped, is it normal I don’t have boost?

Thank you for advices

Where's the gauge plumbed in to?

In the 13's at last!.. Just

A picture / diagram of your set up would help I think .

It is connected between the compressor and the actuator (just after the pressure boost controller)
I will post a picture as soon as possible

this is a picture:
http://imageshack.us/photo/my-images/706/f4zp.jpg/

Move the gauge. It should be on the inlet manifold, i.e. after the butterfly.

that said you should see something on the gauge where you have it now, if you are making boost that is. Would be an odd signal though.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Looking at the pic, if you had the boost controller fully closed the gauge would register no boost. Best bet is to plumb the gauge into a take off on the inlet manifold.

On a side note, I had a similar problem where the actuator arm had come off the waste gate flap, turbo would whine but no boost as the waste gate was fully open all the time.

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

thnak's for yours advices...is it possible to have a picture of your assembly?
I changed my actuator a few days ago. And I don't know if the distance of the actuator arms is good.
How can I to know the good distance?

You need to preload the actuator by making it shorter. Align the arm so that it is shorter by around half the width of the hole in the arm.

So you'll need to pull the arm over the pin on the actuator flap.

In the 13's at last!.. Just

This is a useful thread:
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=257121

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Thank's guys.....

you are the best!!