Race gas questions?!?!?

[firestarter2]

the factory tune will pick up on the octane difference. you will notice the difference. It will also smooth out throttle response.

I would run it. I think it is worth the price difference.

I know that voodooo feels the same. I think he has a 55 gallon drum in his garage just like i do.

the only time i run my car on 93 is when i go farther from home than a tank of gas will get me.

The car has no way of telling octane, it might add timing because of the better fuel that really depends on the stock tune(and it will add timing because it doesn't sense knock). I don't know how fast Ford ecus are but I may take more then a a track session for the car to get used to the better fuel.

Is the car tuned for 91? But yes I'd run it as others have said

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[firestarter2]

It will not run rich lol. And it is NOT a waste of money. It's and easy 15-18hp gain even on a stock tune.

Hmm I wonder if the car would benefit from water injection.

 

[RonnieSVT]

The knock sensors will keep adding timing until it detects spark knock. The higher octane allows more timing. A perfect example of this is running 91 vs 93

Knock sensors add timing? lol

try running 150 octane then!

 

[Donkey]

Knock sensors add timing? lol

try running 150 octane then!

Nope but if they sense detonation they will definitely trigger knock counts and the ecu will pull timing based upon that.

 

[firestarter2]

Nope but if they sense detonation they will definitely trigger knock counts and the ecu will pull timing based upon that.

The car will remove timing if it senses knock. It will ADD timing (to point) if it does not a sense any knock. I dont know what that point is but if voodoo said you gain power its past the point of what ever 93 can support

 

[Voodooo]

Knock sensors add timing? lol

try running 150 octane then!

I meant that if the knock sensors don't detect knock then more timing will be added until it does to a point.

 

[Voodooo]

The car will remove timing if it senses knock. It will ADD timing (to point) if it does not a sense any knock. I dont know what that point is but if voodoo said you gain power its past the point of what ever 93 can support

I myself and a few other guys on another forum dynoed with 98 and 100 octane race fuel on stock tunes and gained 15-18 hp over 91 octane.

 

[THX 138]

I myself and a few other guys on another forum dynoed with 98 and 100 octane race fuel on stock tunes and gained 15-18 hp over 91 octane.

Did anyone compare 100 octane to 93 octane? I can see 91 pulling significant timing on a stock tune...

 

[RonnieSVT]

If the car could gain power with higher octane , it would have to be tested for that extra power. The gt350 also has a warranty , you cant just make as much power as you want. I read on another forum that they believe the knock sensors have to compensate for the added vibration of the 5.2 so that could explain the hp gains with race gas.

its also possible that going from 91-93 would gain that same hp or close.

 

[Jb350]

The knock sensors will keep adding timing until it detects spark knock. The higher octane allows more timing. A perfect example of this is running 91 vs 93

Seeing as you said it will run cooler, theoretically it is better for the engine based off that, correct? Also I dd my car so running 100 all the time isn't economicalways, but seeing as you do ,have you had any issues

 

[superman07]

Its just going to run rich on 100 octane without a tune and is a waste of money.

completely false, rich or lean is irrelevant absent alcohol content or something else that effects stoich. As this gas I presume is from 0-10 percent ethanol max it will not effect the stock tunes AFR.

What it will do is add timing, which will give you better torque a bit lower, more consistent power lap after lap, and make the tune just a bit more aggressive. Stock tune has been dyno tested and shows increased octane does result in performance gains.

 

[firestarter2]

Did anyone compare 100 octane to 93 octane? I can see 91 pulling significant timing on a stock tune...

Yeah I'm curious also why do so many people dyno on 91? 93 hard to find?

 

[superman07]

Knock sensors add timing? lol

try running 150 octane then!

silly, its super hard to get over 105ish.

 

[superman07]

Yeah I'm curious also why do so many people dyno on 91? 93 hard to find?

many states don't have 93 available. Another reason so many folks are running higher ethanol blends. e50plus gets you to 100octane if mixed with 93 so even if you have 91, 60 percent ethanol is much cheaper provided you have a tune for the added fuel to reach stoich.

 

[superman07]

Seeing as you said it will run cooler, theoretically it is better for the engine based off that, correct? Also I dd my car so running 100 all the time isn't economicalways, but seeing as you do ,have you had any issues

not sure if race gas is cooler, ethanol is which is added knock protection. In either case the engine likes octane.

Ford clearly built in more ignition timing advance and probably hotter valve adjustments. The car also sounds more angry with octane so its a bit more than simple plain advance.

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