I have to say it. This thread excites me !!! All of those mods are really coming to life now that you have it all figured out. So congratulations Mikie!
Not to mention how much work you've cut out for so many of us who want to do the very same to our cars.
I personally have all of the very same mods as you, except I have a major (very major) ported head with bigger intake valves, ported intake, ported throttle bodies and I'm using the 1" spacer. My turbo is a GT3071r with a twin .78 scroll. But my car is not near done yet, like I said I've read this whole thread and is all making much more sense to me now. Your experience has also given me the hope to be able to enjoy most of the same mods as you. Wheel spin on 3rd?? On a partial throttle , huh??? Lol amazing ??
Question: you've always refer of your turbo as an "unknown-turbo". Why do you say that? Is there no markings on it? It probably a Chinesse turbo then. If it is thats not necessarily a bad thing Mikie. You can always rebuilt it with Garret BB (ball bearings) cartridge if does ever need it. It's all a myth about the Chinese turbos falling a part... lol I've seeing many making good hp numbers and lasting quite a while! If they ever go bad they just don't spin as good anymore. But that's for every turbo really.
But either way, let me tell you, that thing is mighty to say the least lol... 19# at 2200rpms??? ?Wow it's got to be a GT2871. Prob using a .48 turbine housing and is definitely a ball bearing turbo.
Do you know for sure what turbine housing you're using ?
As I understand somebody installed the turbo before they sold you the car. Whoever was maybe lied to you about being a "name brand" turbo. But either way they did for sure know how to pick up a good turbo match for the lotus 2.2 910.
JG