19j Turbo Test

lhandrover · May 8, 2016

Hello All,
I want to check if my turbo is working properly - I get no whistle and can't say I've noticed any appreciable difference as it climbs the rev range and kicks in - if it is. I don't (yet) have a boost gauge - but searches came up with a few points I'd like to clarify if poss;

1- I can move wastegate rod with pliers but not sure of pressure I should be applying - I can't move it by fingers easily. Also, it appears to be returned INTO its little chamber when at rest and I can move it out of its chamber - Looking at the vacuum tube it looks like it should be pulling towards the chamber when vacuum applied via the little pipe. Sound ok? Should I see this rod moving when revving the engine freely?

2 - If I can get hold of a pressure gauge - Where do I attach it to?
3 - I read that 8psi to 1 bar should be readable - Is that on a run or while standing revving it
4 - Any other things to look at (hoses look ok, boost diaphragm changed, air filter new, turbo turns by finger and spools when air intake removed and running)

FlyingPete · May 8, 2016

1. The wastegate rod is pushed out by positive pressure- there shouldn't be any vacuum in the system at any point. When the intake manifold pressure reaches a set point, the positive pressure will push the rod and open the wastegate, preventing the pressure from increasing any further (more or less.) You won't really get enough resistance revving the engine in neutral to build up much turbo pressure- it's on a run that things start to happen.

2. A pressure gauge should be plumbed into the small-bore pipe that goes between the turbo, wastegate piston, and injection pump. Use a T-piece to add an extra air line.

3. See above.

4. If the boost diaphragm is holed, you won't get any added fuelling from the injection pump in response to the manifold pressure. It's a simple fix and even simpler to take it off and check.

There isn't really a distinct point at which the turbo 'kicks in'. It will generally help out through most of the rev range. But remember the pressure is fairly low so don't expect a sudden burst of acceleration.

lhandrover · May 8, 2016

FlyingPete said:
1. The wastegate rod is pushed out by positive pressure- there shouldn't be any vacuum in the system at any point. When the intake manifold pressure reaches a set point, the positive pressure will push the rod and open the wastegate, preventing the pressure from increasing any further (more or less.) You won't really get enough resistance revving the engine in neutral to build up much turbo pressure- it's on a run that things start to happen.

2. A pressure gauge should be plumbed into the small-bore pipe that goes between the turbo, wastegate piston, and injection pump. Use a T-piece to add an extra air line.

3. See above.

4. If the boost diaphragm is holed, you won't get any added fuelling from the injection pump in response to the manifold pressure. It's a simple fix and even simpler to take it off and check.

There isn't really a distinct point at which the turbo 'kicks in'. It will generally help out through most of the rev range. But remember the pressure is fairly low so don't expect a sudden burst of acceleration.

Thanks Pete,

So all seems ok with pushrod position. Time to get me a pressure gauge...

Should I detect a whistle do you think? Used to hear it on my TD5 Disco I had once

jamescronin · May 8, 2016

TD turbo doesn't do that much and is a small unit. Mine doesnt whistle either (at least over the engine noise)

I have mine set at 0.6 bar just to keep the emgine de stressed. You can crank it right up to the point the manifold is glowing red but the engine wont last that long.
The other issue is that it doesn't have an intercooler so the hotter the exhaust gets the more heat gets transfered via the turbo casing into the intake gasses causing them to expend and hence less o2 gets into the chamber.

lhandrover · May 10, 2016

Ta James,

I've ordered a boost tester - Will see what happens. I'm posting another thread re performance - You may like to add your comments to it if you get a chance.

19j Turbo Test

lhandrover

Active Member

FlyingPete

Well-Known Member

lhandrover

Active Member

jamescronin

Active Member

lhandrover

Active Member

Similar threads