I'm finishing up my s4 t2 project going on all winter now and have a few quetions i'd like to ask that've been bothering me. I'm aware they have been discussed but i have not a found direct answer for my situation by searching. first off this is a conversion from s4 n/a to s4 turbo II. long story short I ended up using s4 n/a rotors in place of the turbo rotors by force. i'm aware they are higher compression. I'm planing on running stock boost (5.5psi?) and my understanding is by doing that I shouldn't have any problemss and there should not have to be any adjustments made (timing and air/fuel wise) unless i up the boost with an aftermarket boost controller? Infact my understanding is that even with a boost controller you can cautiously take it up to 8 psi at the max without a air fuel computer and be on the safe side and no adjustments to timing and air/fuel.. correct? If that is so I would liek to know most importantly if you think it would be safe to use 87 octane due to high gas prices. if my understandings are off what do you think the highest boost i could run with 87 octane is on these n/a rotors? my other question is..... Can i replace my s4 tII mass airflow sensor with a s4 n/a sensor beign that they are the same series or is it they they are somehow internally calibrated diffrently?

p.s. please excuse my noob-ness

 

I personally would never run even a low compression turbo motor with regular unleaded. The thought kind of scares me.

 

Honestly you are asking for trouble doing this. If you are on a money pinch you shouldn't be boosting...

 

oh okay i didnt realize this, so looks like ill be running what? premium or can i get away with the next step above 87. and any info on the mass airflow sensor? thanx you guys might of just saved my a** who knows?