Why waste the money if you don't need it?

[ 06-07-2002: Message edited by: damius ]</p>

 

besides the fact that is probably will burn up your injectors and burn the hell out of the combustion chambers becuase that fuel will burn so damn hot and your (our) cars are not made for the type of fuel to be added to it, and if those integeras use it all the time it is only a matter of time before those cars don't run any longer.

 

your car is designed to run on 87. higher octane will actually hurt performance unless you have a chip. plus, with octane that high, it'll burn your cat out in no time.

 

I did it with some VP FUEL C-14 (114 octane)

its all fine, just dont fill up the whole tank, once your done, fill up with good gas so you clean the whole thing out. The car pull harder no matter what other tells you.

make your own test, you will see. I ran 16.0 with that gas in.... and witout is like 16.2...

 

That doesn't make any sense. Unless the Ford ECU acts like a Skyline ECU with regard to gas then higher octance should leave you with an incomplete burn and less power in addition to carbon deposits all over your pistons and combustion chamber.

 

$4.75 a gallon, damn I whish I could get gas that cheap, Over here (UK) pump gas is about £8.00 a gallon, it is 99 though.

sorry for going a bit off topic guys

 

With you mods, why bother unless you have $$ to burn. If anything the very high octane will slow burn rate which will hurt BMEP and therefore torque and HP.

If you are running an agressive chip I could see needing 89, 91 or 93 octane depending on the program. If you are running a chip and have raised the CR ino the 10.3-11.2 to 1 range, 100 octane unleaded race fuel (I can get it for $4.75/gal in CT) might make sense.

Unless you are running extremely high CR (13.0+ to 1) in a drag or short track car there is no advantage in running leaded fuel.

A modified late model Celica GT-S that started with 11.5 to 1 CR might benefit from a mix of leaded fuel if the cat was removed, although I think 100 octane unleaded race fuel would be a better choice.

[ 06-07-2002: Message edited by: JohnsZX2SR ]</p>

 

<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by ASUFocusZX3:
besides the fact that is probably will burn up your injectors and burn the hell out of the combustion chambers becuase that fuel will burn so damn hot and your (our) cars are not made for the type of fuel to be added to it, and if those integeras use it all the time it is only a matter of time before those cars don't run any longer.<hr></blockquote>

lol

 

why do you find that funny? Just curious. Do I have the wrong info on Gas that high on octane?

 

Sounds like the guys has the "Market of Ignorance" covered....

 

You dont need 108 octane in your car.

In very simple terms the higher octane rating means it has a higher resistance to detonation. This would be good if you were running a turbo or supercharger or nitrous or super high compression as it would allow you to turn up the shot/boost/timing and potentially make ALOT more power.

Unfortunately on your stock car you can do none of these things so you are just pissing your money away.

 

Using a octane higher than you need to stop detonation is a waste of money. It wont help you at all.

 

Unless you have a chip that advances the timing, octane that high is a waste of your hard earned money. Lead in gas was there to prevent knocking, nothing more.

 

After reading many of posts on the subject, I decided 2 try 4 myself. I've got a chip (among other things,) mind u.

I tried 100 octane gas @ $3.77 per gallon (If I remember correctly.) And, yes, I could notice a harder pull. No dyno or anything, but I could feel it. I know that it's expensive fuel, but it's a weekend/track car, so....

 

I'm pretty sure the leaded fuel will chew up o2 sensors pretty quick also. Which would be bad...

 

I will have to add to what I said. It is real that you gain power. but I wont put anymore of it. I did my cams this week end with friend and the push rods where kinda golden on the side a bit, nothing big but a definite sign that it might have heat up too much. I will stick with premium to meet the requierement of my chip but thats it. No more VP fuel magic mix for me. I need my car to live, not die.

 

It's the placebo effect. Dyno it and tell me how much you gain. The Seat-Of-The-Pants dyno is an inaccurate and biased tool in assessing performance.

It's been said before. More Octane isn't "better". It's Different. Some cars require higher octane. Some Require Lower Octane.

Your engine has no way of knowing what you're dumping into the tank. As Spanks said above... some cars, a Nissan Skyline for instance, will crank timing up until it pings and then back off, so it adjusts for octane changes. Our Foci are not like this at all. They're dialed in from the factory to run 87 Octane as an economy entry-level consumer vehicle.

a Chip will overwrite this code and calibrate it for higher octane. Octane burns slow. The more octane the slower the burn. Dumping higher octane than needed will just flush your exhaust system and combustion chamber, valves, and spark plugs with craploads of carbon deposits, toxins that will without a doubt rob your engine of performance. Carbon deposits also retain heat and can aid detonation, igniting the compressed fuel/air mix before the spark plug fires, before top dead center, slamming the piston like a brick wall while it's trying to climb up.

Do you want this to happen?

a Chip will help. 92 octane is readily available here in KC, and I took advantage of this with the DiabloSport chip. It will advance the spark timing, firing earlier, so that the slower burning gasoline burns longer, eating up the extra octane before the valves open. Unless your spark timing is advanced, or exhaust cam timing is retarded properly, you will surely see detrimental results from high octane.

 

Well, I just drove my Focus on the FREEWAY, and I was sadly mistaken. The 100 octane fuel might have added a little bit of tourque, but it killed my top end HP! Well... It WAS just an experiment, so there. I still have a little over 1/4 of 100 octane in my tank, I'm gonna fill it up with 91 and see what happens.

Now, the chip requires 92-94 octane, right? Since I can only get 91 here in Vegas, how much octane booster should I use 2 get the 92-94 mix?

 

91 would work fine if you have the DiabloSport. If your engine senses a ping, it will slightly advance timing. If you want to add octane booster, buy 107 Octane outlaw and add 1/4 can per full fill-up (10 gallons) of 91 octane gas.

 

<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by ax0n:
91 would work fine if you have the DiabloSport. If your engine senses a ping, it will slightly advance timing. If you want to add octane booster, buy 107 Octane outlaw and add 1/4 can per full fill-up (10 gallons) of 91 octane gas.<hr></blockquote>

Yea, I have the DiabloSport. I'll try the Outlaw 107 and experiment some more. Thanx.

 

If it senses a ping it will retard timing not advance it as far as I can recall