2006STi

Thanks for the suggestions @Adamw The car pulls like a freight train still, car does not feel down on power on rich AFR or leaner AFR. I have only done a couple of full power runs till I figure out what's going on. Turbine wheel is all fine. The VE change done by me was only to patch it so to speak to see if me taking out fuel would help me make the fuel go leaner. Which it did. VVT is all working as it should according to the log attached and some other logs I reviewed. The turbine is the same as pre rebuild all was fine and in spec. Maybe I do have a boost leak that I missed that could really only be the explanation here I guess.

Thanks for the reply @Electredge... Makes sense. What does not make sense is that I am not experiencing boost coming on later if anything the boost comes on quicker then it did prior to the turbo rebuild so I would not think the new turbo would be damaged... It's the same compressor wheel but just replaced with a new one.

I have not put this to practice as yet but this just accrued to me. If I have accidentally swapped around the 3 port MAC selanoid boost lines from the turbo niple and have swapped them around to the wastegate niple and wise wersa would this have made these differences that I am currently seing?

Cheers mate. Re - the fuel pressure increasing if this was the case hypothetically how much pressure increase are we talking about just as an rough indication

If I was to guess is this turbo being less efficient?

I am scratching my head with this one. I recently had my car tuned and things were looking good. The car was tuned for FLEX made about 460HP on E85 at 22psi on my 2.6 stroker EJ257 motor. Full built motor including heads ported etc. The tune was set up for 11.3 - 11.1 AFR for the top end of the RPM... The car runs great... Prior to the tune, I had my Turbo - FP RED rebuilt due to not knowing the previous life and just for maintenance's sake. After a month or so I noticed the turbo was smoking burnt oil at idle and on deceleration and it was also leaking a little bit of oil from the center cartridge. At this stage, it still drove fine however I did notice that it started to run rich on the top end of the RPM 10.7 - AFR. (No boost leaks at this time as we pressure tested the system to make sure also and we were hitting target boost as always) I pulled the turbo off for inspection pretty much as soon as we noticed this oil burning and went to a more reputable shop this time to have it checked over. Turns out that the previous Turbo rebuild shop has used the wrong journal bearing and the compressor wheel was not balanced properly hence why it failed. So now I have a freshly rebuilt good turbo with a new bearing and brand new same billet compressor wheel (I have seen the parts and I was shown the unbalanced compressor). I install it and started to log and went for a drive. Now this is where things get interesting I am hitting the same boost as before but I am in the high 9's low 10's AFR definitely notice its not pulling as it should I pressure tested the system and no leaks! Original Tune VE Table - Fuel ID 1,700x injectors VS now where it needs be to hit closer to mid 10's higher 10's AFR just did a quick adjustment to see nothing else has changed mechanically or tune wise. Car pulls a lot better now when fuel is taken out. Fuel Pressure is set at 43.5PSi and differential fuel pressure is at 51psi The question is why such a massive change in the VE table ? Would appreciate your feedback Thanks E85 Lower VE Table rebuild turbo october.llg