Quote:
Originally Posted by TJay74
You wont "see" any gains for a mix of 94/91 octane, but your car wont show any signs of detonation which is common on these engines. More so once the temps get over the 100° point during the summer months.
91 octane just doesnt have enough to curb or stop detonation on these engines. 93 really is needed, but if you have E85 in your area you can add 2-3 gallons of E85 to the mix and it will help with detonation and give you a bump in octane for minimal amount of $$$.
One of the things I found when I went supercharged from the shop that did my install is that 91 octane that has E10 in it or even 93 w/ E10 is a good thing with these engines.
|
I figured if raising the octane a bit by mixing 94 and 91 helps prevent detonation, the ECU should add timing, which usually means a SOTP improvement. Maybe these GDI engines are tuned differently.
I can get E85 from the same gas station but all the warnings about ethanol doing horrible things to the fuel system have kept me away from it.