Just curious... I know the 6lb boost of a stock 7 is fine for 87 octane... at what boost would 91 be required? (Don't want to find out the hard way! )
I'm only going to be running about 9-10 lbs.

And yes, I'm still alive... been through a lot of stuff the last few weeks, havn't even touched the car to wash it!
I'm back now though... low 13's here we come...

 

I would use it at all times, never know when your gonna spike

 

Yep. As a turbo guy, I would never consider using anything less than high octane 91. 94 might be overkill, unless you are tuned for it.

Basically, unlike NA's, using the highest octane is actually beneficial in terms of preventing detonation.

 

i run 12-14 psi on 93 octane 87 turboii

 

I use 98 octane but my car is tuned for it and is running 17psi

 

i run 91+ on a stock 88 t2..

 

I run 91 on (basically) stock s5 motor

 

93 octane always. Midgrade or regular has never touched my engine, only 63k original miles.

 

so for us people that only get 91 as our highest option, when do we need to start worrying about getting higher octane fuel?