• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

02 gtp gp vs 06 g6 gtp



Octane does not add horsepower, period. Octane is knock preventer. If you have knock and the ECU pulls timing then you are not running enough octane to begin with. You could put 100 octane in a car that only needs 93 octane to prevent knock then you will LOSE horsepower.[/QUOTE]

im on his side the octane does nothing but protect your motor, no more no less
 
Just run what u are sposed to. High octane burns longer than the lower octane. The higher octane more power myth comes from the longer the gas burns the longer the stroke of the piston thus generating more power. However when u reach too high of an octane your piston may still be pushed down when in fact it is trying to comeback up and this would in fact slow the engine down or blow something up in certain cases. The lower octane burns faster creating less constant force on the piston causing the piston to not supply as much power. Both cases would cause engin knock.
My advice is whatever the company that made the car suggests you use for fuel, you should use it cause they should know best.
 
That Canadian Guy said:
That applies to pump gas.

a good fast burn fuel will produce more power.
Click to expand...
Bingo. Hence why I said too much octane will cause a power loss. You only want to run as much octane as you need to keep knock away.

For instance, my sister in law's G5 is designed to run on 87 octane. If she were to put 93 octane in then the car would not be able to burn the fuel at the correct rate and therefor lose power.

The other myth about octane that annoys me is "93 octane burns cleaner" and along the same lines "It's good for the car and cleans it out to run a tank of 93 through it occasionally"
 


That's a fallacy. All the fuel is made with the same additives and detergents. The only difference is the ability to prevent knock, ie octane.
 
shell V power versus ultra 94?

Shell is 91 octane and zero ethanol. ultra 94 is 94 octane and E10.

Yet another crazy difference....
 
Excluding ethanol differences, the fuel is the same. ;)

In the case of Shell, I'd get the 91 over the 94 just due to the lack of ethanol.
 
I once had some aviation fuel sitting around. I put a little pit in the ol' 5HP B&S roto-tiller. Life was OK.
 


Shouldn't this be moved to the Lounge???

By the way, ever try putting straight pump gas into an 2-cycle and run WOT? I gave that piston to my instructor for a desk ornament. :eek:
 


So, I filled my car with 93 octane it it ran quieter. Would this be because It was meant to run 87 and the stroke was slowed thus making less noise?
 
EJOUIE said:
So, I filled my car with 93 octane it it ran quieter. Would this be because It was meant to run 87 and the stroke was slowed thus making less noise?
Click to expand...

my%20head%20hurts.jpg
 
Maybe it was knocking?

I've heard higher octane results in lower cylinder head temps. Unsure of any truth to that statement.
 
Its a bone stock L36, so i don't think it was knocking much at all. I only filled up with the stuff to see what differences it would make. My mpg was the same and power felt the same. only difference was that it ran a bit smoother and a bit quieter.

Is it worth it to scan a stock car for knock? If I am knocking would a higher octane be healthier for the car with the stock programming?
 
You must log in or register to reply here.
Back
Top