Still the same issue but not as bad. The turbo's wastegate seized tight so we replaced it with a new one. The CTS BOV was lubed and the stiffer spring went in. It holds boost much better and it doesn't seem to run on as bad. I do believe it's tune related now tho. Anyone run unitronic? Reviews?
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I'm running Unitronic IS20 Automatic tune. It works great. Very responsive and smooth. It fixed most of the driveability quirks of the stock car, like unpredictable and strange throttle response.
Prior to Unitronic I was maxed out on JB4 with e30 meth. That setup had more top end than the Unitronic. But it was more fussy and less area under the cuve. Less part throttle power.
The Unitronic IS20 tune has more power everywhere and high boost at part throttle. It makes the car feel effortless everywhere like it has a big chugging engine. Like quarter throttle up big hills, it will rocket up to 15 psi @ 2000rpm and just stoicly chug away like a diesel. It also revs out happy to over 6000.
Traction is easier to find with the Uni tune. I don't know what or why, but the tune does good things for traction
Another thing...the maxed out JB4 would sometimes confuse the transmission. At full power it felt like it would hold a gear out of fear before reluctantly shifting. Unitronic tune takes care of that (milder JB4 settings didn't tend to do that. Unitronic IS20 shifts like stock.
Im excited to stack and get the bigger top end back. I don't have JB4 hooked up to log, so I can only go by the guage. Tune appears to be 20-23 peak tapering to 13-14?