It did mow better than expected lol

 

Sorry. 89 octane is $3.30 here. 93 is all over the place even between different zip codes around here. I fueled up at shell just now and 93 was $4.01

 

Octane rating is a fuel’s resistance to detonation, aka knock. Detonation is not the same as pre-ignition. Base fuel coming out of a refinery is in the neighborhood of 87-octane. Various chemicals are added to boost octane rating to higher values, typically today it’s ethanol. You can buy octane boosters at autoparts stores but you have to do math to find the correct amount to add to get the octane rating you want. Try to avoid oxygenated boosters as they lower a fuel’s energy density.

If you were dropped on your head as a baby and want to know way too much this subject, read "The Internal Combustion Engine In Theory And Practice, Volume 2" by Charles Fayette Taylor. Well, actually, read the first five chapters of said book. Later chapters are about diesels and engine arcana.

 

I had the ecutek tune and dyno done yesterday. I was really hoping for some better numbers. The gain is quite noticeable especially the 35hp gain around 5200rpm.

 

Congrats on your tune, OP!

Looks like all your gains are top-end over 4500K, in both torque and HP. And pretty significant, too. I'm sure you can feel that. Tiny bit of loss all the way up through mid-range that I doubt you notice, and then it probably feels like a turbo rush. Enjoy that, because it will become the new normal pretty quick. For around town driving, there's rarely cause to get over 5000 RPM, but for hard launches and highway driving you'll be passing people with ease.

So regardless of the numbers, does this align with your expectations? In other words, was it worth it?

 

Thank you Rochester. Honestly, I think it was totally worth it. Just had numbers approaching 300hp in my head. I wish I would have done a dyno run before I did the cats and exhaust. For some reason he bumped my idle up 100 rpms. The tune also made my transmission act a lot better on 3-4 and 4-5 shifts. He also said it was leaning out around and after 5500 rpms. I have the bluetooth dongle and a local tuner who is a very nice guy that I can call anytime I want without feeling like I am bothering him. Its a win win for me.

 

After driving a little more there is one thing I don't like. Right around 3700-4000 or so rpms I get the raspy hiss when I am getting on it that I despise.

 

I appreciate any and all input from you Rochester. But this shows my gains showing up around 3800 rpm when the rasp happens. Then around 4500 it’s on lol

 

I can't speak to your rasp situation. Maybe someone with experience and better knowledge in reading dyno graphs can comment. Beyond the basics and the obvious, I don't have any insights.

Given those top end gaIns, and better shifts, I'd be happy.

 

I’m very happy. The rasp is only present for about 300-500 rpms when it happens. When I said after that it’s on I meant the awesome new power curve. Pretty impressive for now even though it will be the new normal like you said.

 

Always appreciate your input sir