Hybrid turbo upgrade selection & general tuning question

[Pete_89T2]

Originally Posted by FerociousP

Interesting. My experience and what I've heard is that the boost rises with a more free flowing exhaust due to less back pressure, and would need a FCD. But if yours isn't then you I would imagine you are fine. I run a full RB turboback exhaust and I hit 11-12 consistently and it bleeds back down to 8 with only the stock wastegate for control. It even will creep higher in 4th and 5th at certain RPMs. I am running a FMIC.

The full RB turbo-back exhaust explains why you see higher boost pressures. I still have the stock cat, and probably always will need a cat to keep my car legally registered.

[FerociousP]

Originally Posted by Pete_89T2

The full RB turbo-back exhaust explains why you see higher boost pressures. I still have the stock cat, and probably always will need a cat to keep my car legally registered.

Yep. that'll do it. Either way, you are close to the factory cut which is why the FCD exists, so I just found it worth mentioning. To answer your question directly: A BNR stage 1 at even 7-8psi (below the stock boost cut) will have more flow, make more power, and put more demand on the stock fuel system than I would be comfortable with.



I have emissions as well, but in my travels I have aquired enough parts that I put the air pump back on and swap out the RB presilencer for a cat come emissions time. I also run the airpump outlet to the cat air pipe before I go to the emissions center. Then the airpump comes off and the presilencer goes right back under the car after I pass. The cost of a couple gaskets is worth it for a year of better exhaust. (If that seems weird, know that the ACV feeds airpump air to the cat as well as feeding more airpump air to the exhaust sleeves for emissions purposes. So, I am essentially doing the same thing... temporarily).