Thread: At what point do I need to switch to premium

Ok, at what point do I need to switch to premium gas (91-93 octane).

Everything on the engine is stock now except for a K&N drop in filter and a
2.5" downpipe. Stock CAI box has been opened up a bit. Oh yeah, with the DP and K&N I don't need to flash the PCM yet do I?

Future mods include a HVTB, spacer, HVIII, ER Ratio Rockers, 180 Temp, 1 step colder plugs, a WizAired CAI, and a PCM flash.

never if you tune for a lower octane. id just enjoy the added timing i could run with the premium.

I thought the L67 was supposed to require premium stock... I know the Impala SS says "Premium Fuel Only".

GT or GTP?
If GT I would say you're fine till you swap the PCM
Without extra timing a GT would be fine with lower octane fuel

Originally Posted by FastKatt

GT or GTP?
If GT I would say you're fine till you swap the PCM
Without extra timing a GT would be fine with lower octane fuel

Doh, thought I was in the L67 section...

Didn't your Mom tell you about thinking?

Thanks, been working on the 97 Camaro RS lately and haven't had much time for the GP.