MX_9 wrote:I've yet to hear of someone experiencing detonation running 87 octane fuel in a stock Sonata.
You won't mainly because it's GDI and the fuel is injected at the last moment while the cylinder is already under compression. That's WHY they're able to make a turbo capable of running with 87.
MX_9 wrote:I've felt the effects or timing pulls in other vehicles and it is noticeable so if it's happening someone surely would have felt it.
Most everyone who runs 93 HAS felt it. It even shows in the numbers as +10hp and a fatter torque curve. The gas itself doesn't make any more power, the change is strictly due to the ECU lightening up on the timing restrictions imposed to run 87 safely.
MX_9 wrote:Note that I run 93 in my daily driver. It's recommended for the vehicle and I have a custom tune with it so it's warranted on both accounts.
I do as well with a stock engine. As I stated earlier, my engine just seems to run smoother all the way around.
Sorry Steve, I couldn't help myself. But hopefully this will end soon. This topic has been beat to death. You would think that when the Hyundai engineers stated plainly that the published power ratings are at 87, but it adapts to make more power with 93, it would have been over then.SteveF wrote:I hope this ends this silly discussion now.
(But I won't bet on it...)
Either is SAFE. Buy what you like. But please stop saying it can't run 93 safely or that it makes no difference if you do. It can and it does.