GT2052S project thread number three

[306Puggy]

There's got to be a restriction some were like the hole on the manifold is not lined up right, was it hard to pull the actuator on to the wastegate arm?

Yup, this was one of my main concerns when I was building this turbo. The mani hole and turbo hole are slightly different sizes and different shapes:



As you can see from the picture, the turbo exhaust inlet hole is slightly oval, whereas the mani hole is completely round. I had to make the adapter plate hole a size in between the mani hole and the turbo exhaust inlet hole which in this case was 45mm.

The adapter plate lined up pretty nicely on the turbo but there was always a slight lip when lining it up to the exhaust housing and the mani;



Not being an expert on turbos I don't know if this would effect the flow or not. I personally don't think it would be an issue considering that the exhaust gases are under high pressure.



And yes it was hard to pull the actuator on to the wastegate arm, I tightened it as much as I could. The only thing I could do to rule it out completely would be to weld it shut. Or weld the arm with a blob of welding metal just enough so that it would hold it but that I could free it again.

But obviously I would need a welder to do that.

Looks and sounds like the turbos knackered tbh. That or it's not right for the engine - coming on boost at 3.5k is fine for a petrol, but that's where the fuel starts to get cut back on a dt. You're sure there's no chronic boost leak?

Sounds like chronic boost leak, weak wastegate or knackered turbo.

If its the turbo, just get a decent replacement. Another £75 is better than losing £800

I am sure it is not a boost leak because on idle the boost is way lower than the K14 if I put my hand over the compressor housing.

I am also sure from usually looking that the petrol gubbins on the compressor housing are not leaking, or course the correct way to do this would be to get it pressure tested but I do not have the equipment to do that.

Piggy, do you know where I might find a GT2052 or 56 for 75 pounds? I know I got this for 65 pounds that that is quite rare from what I know.

So what do we say guys? Try for another GT20 series turbo or just pickup a TD04 for 50 quid and slap that on?

keep at it puggy, if things are going sour back off and come back tomorrow. it might something simple.
I had a few things to chase with my vvc setup, ( I have all that to come again! )

Thanks procta. It's the sheer amount of money I have spent over the last year on every item under the sun needed to fabricate this thing that has got me down about it the most. It would be fine if I could use it again but most of it is specific to this turbo. Also I have my MOT coming up in a couple of months so that means I have to find a solution in the very near future as there are a few other things I have to sort for the MOT as well.