Deleted C15 SDP Boost issues

Making an SDP run right shouldn't be that hard but it depends what exactly the previous owner did with it. Are the IVAs still there? Was compression dropped? The SDPs use different injectors than the previous C-15s but are still usable.

I don't know enough about turbos and exhaust housing and wheel sizes to make a good recommendation but if you are putting 600 to the wheels a stock turbo meant for a 550hp engine is probably way to small. Does it have a wastegate? Is the wastegate working properly? The SDP compound turbos can make great power. One of the turbos is different then the previous C-15 compounds and they work really well.

 

Though the 177148 wouldn’t be my choice I don’t think that’s the issue, or all of it anyway. Are you just checking the air to air or plugging the elbow on the fresh air side of the turbo and checking it all?

What about exhaust restriction?

 

A lot of people only test the CAC.....you can still have a boost leak around the left side of head at the elbow, a plug under the elbow, freeze plugs that go in from the bottom of the head turbo elbow etc.



Don’t over look the exhaust if it has a muffler, or the intake tubes air filter etc.

 

or a DPF not hollow....

 

Crop the image some and you should be good

 

The SDP in stock form only produced 30 psi of boost. It is not like the MXS/NXS that will produce 45 -55 psi of boost.
I have made a disc that I can install on the turbo intake and use regulated shop air to test for leaks, on mxs I find leaks on the bellows and some the piping to the air compressor intake. Also compare the boost of the test tool to cat ET or dash gauge, did find blockage to boost sensor once this way that a few other shops missed. Single turbo boost wouldn't be more then 35-40 psi I would suspect.