Racing fuel in a Z

cab83_750

A station here is selling racing fuel. Say you 'accidentally' filled her up with racing fuel, what would happen?

AK370Z

This will happen

http://www.youtube.com/watch?v=FAQ5mRq9kes

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CBRich

Knock Sensors FTW.

kannibul

Personally, I wouldn't "accidently" put anything other than 91-93 octane in my Z.

Anything above that is a waste, anything below that risks the engine.

CBRich

Clearly anything above is not a waste as shown by the video above.

Chan Chee Hoe

Shell claimed their V-power that sell worldwide is 99% same as the ones put into the Ferrari F-1 team...

kannibul

1% can be a huge difference with fuel.

Blown32

In your original post you stated "someone is selling race fuel"?As to what grade race fuel he is selling I don't know nor do you probably.As to the dyno test shown with a gain that is with "oxgenated fuel" and I doubt your local station is selling that grade.Qxgenated race fuel is a whole different phase of race gas.It also is not your average race gas.
As to non oxgenated race fuel giving you anymore hp as this has been discussed before is a false belief.The need for race fuel is due to the high compression ratio that race cars or street cars that have been modified by raising the compression ratio.The higher octane race gas prevents the motor from detonation!Detonation will burn pistons and valves!The grade of fuel needed is determined by how high your compression ratio.A high compression ratio is determined by modifications mechanically or as a result of boost.To just run race gas will not give you anymore power.Just because it is labeled "race fuel" leads some to belief it will make there car make more power.Well those of you who believe that are clearly mislead due to the lack of knowledge when it comes to the combustion engine.Doesn't make you stupid or a bad person just not knoweldgable about engines.
I'am trying to explain this the best I can without confusing some who may not understand.Clearly there is more to this and truly a science.
So all here on this site are clearly on computers so do your homework and research and you will possibly have a better understanding of what I'am trying to say in simple language.

kannibul

Exactly, sometimes it pays a lot to read a little, rather than repeat what someone else said, who was under/misinformed.



But hey, I'm just as guilty of it too.

Ryan@IP

We would like to make sure that the video's results are not misinterpreted. Higher octane fuel (or "race fuel" as a broad term) will not always increase power. Rather, the amount of oxygen contained by the fuel can make a bigger difference than the octane rating. We do not endorse using fuel such as the XXX oxygenated blend on the average street car as a means of increasing power. For that, we offer plenty of bolt-on power adders that you could combine with a reflash tune or AccessPort

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imag

As the video shows, some amount of high octane is not a waste in this car - the timing adjusts and you get some of the benefit. I definitely notice the difference when I put in a few gallons at the track (of course, our maximum normally available octane here is 91).

I'm not saying to fill the tank with 107, but mixing in some 107 can have noticeable affect. My guess is the max usable octane is about 96 or so, at which point you stop getting any benefit with the stock motor.

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kannibul

As the video indicates, it's oxygenated fuel. Leans it way out and make it burn hotter.

ChrisSlicks

It's not the octane, it's the oxygen content. If you tried the same experiment with high-octane non-oxygenated fuel you would not gain any power, you might actually lose power.

kannibul

It's amazing how much octane is thrown around as a way to increase HP.

The car is designed to run on 91. Running less than that trips the knock sensors to retard timing. It won't advance timing due to higher octane - in fact, the car won't even "know" that it's running on higher octane, it simply knows that the knock sensors aren't tripping.

imag

I understand the benefits of oxygenation as well as energy density. However, it is not uncommon for modern high performance moderate-high compression motors (like ours) to have small amounts of detonation with 91 octane gas, especially when the motor is hot and/or the air is hot and dry. Likewise, they can adjust the timing to can take advantage of moderately higher octane fuel (94-96) when conditions warrant - like being on a dyno or on a race track.

Edit - sorry - missed the second page. RCZ is exactly right.

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