New to turbo and engine managment

[GRN TNR]

I bought a 95 eclipse gs last summer and it has these modifications:

T3T4 Turbo
Custom Front mount intercooler
Ported and Polished Head and intake
Forged Steel Eagle rods and pistons
Marren injectors(?cc)
3" downpipe no cat 3' straight pipe
Zeitronix Zt-2 Wideband
420a Engine Management with TUnerStudio MS

The car drove great for a month, great power, turbo sounded nice, blowoff valve sounded stong, nice boost, I think around 16 afr. I decided to service a small, steady oil leak. I parked it. When I finished it up I connected the battery opposite and tried to start. No smoke or crazy sparks, but it did fry my volt regulator in ecu, I installed an external volt regulator, I tied into a minor wire going into dash,( tried other wires too, but ever since then The turbo wont boost and the car backfires at 5-6 rpm. I dont think I fried anything else but I could use some feeback.I am new to turbos and tuning, but I bought the car to learn.

Any help would help, I am learning TunerStudio now. Is the solution in the tune? Where do I start, the turbine looks fine on air filter side. Any help would be greatly appreciated. I know every reader is thinking that im dumb for taking on such a big project. But I have always liked cars, and I have a good general grasp on how an engine and turbo works. Just very green

Thank you.
-Theo

 

[Dsmkauai]

Do a boost leak test and also check turbo for shaft play.

 

[tomcat5157]

definitely do a blt. and also get a wb afr guage.

 

[handsome_black]

You have checked all your fuses to make sure nothing else was damaged? Also, most tuning systems get reset when the battery has been disconnected, do you have a way to reload the tune? I am not familiar with that particular tuning software, but I would start there.

 

[GRN TNR]

I did a blt with the soapy water method, no leaks to be seen. The turbo shaft has minor play( i can feel it move slightly, but i can't see any) which i've read is common. The wb afr guage reads 10 at idle, but very bouncie. I did notice that my fuel map loads up showing red in mostly just the middle, ad then I switch to air and its totally flat, actually slanted down a little in a steady manner from left to right. I move the map points but it doesn't do make a difference like with the fuel.

Also all fuses are good.

Thank you
-Theo