What Octane rating do you use
- Thread starter topgun1
- Start date
Good Stuff right there!!!!:2thumbs:91,92,93,108,110 and this
Artie
Certified Gear Head!
Be very careful with AV gas! It's oxygenated for running up in the thinner air up there and thus runs leaner mixture even though it's a higher octane rating! I've seen many melted pistons in some local toyota Supra's running high HP because all the stations have quit selling higher octane race gas due to prices. They started running the AV gas and, Hmmm melted parts. Just be careful is all I'm saying, many people forget that AV gas is oxygenated(not unlike dry nitrous!)
hollywoodjohnny
Banned
91-93 works just fine for me, I have a barrel of sunoco 110 in my garage for my hydro, never used it in my stock dog.
Mad Dog
ValueTeck Enterprises
More is not always better. If you have a stock machine you should use the recommended grade as per the manufacturer(or Slightly higher). As the mods are added this will change and a higher octane will be needed. (ie higher comp. cams ect.) The caution here is this. The higher the octane the hotter the spark needed to ignite the fuel. Now we all know that sometimes the Dogs can be a challenge to start. So everyone needs to assess there own situation and only use the highest octane needed to make their Dog run good. More is not better and could add to the possibility of a no start and the colder the air temp the more likely this could occur.
Exactly, octane controls the rate of burn in the cylinder. With a low compression engine as stock dogs are, the engine was designed for pump gas fuel. With 9.6-1 compression, there simply is not enough heat generated to burn 110 octane fuel efficiently. A little extra is insurance but not needed.
spiderjason
Member
I just run regular gas in mt 08 K9 EFI and it runs fine... The main reason I do that is because there really isn't any gas stations with seperate hoes and you are getting a lot of regular anyway if that is what the last guy used and in most cases that is what people buy...
Cobrafast1
Active Member
I run nothing but 93 octane since the day I bought it. :2thumbs:
imthewildman
Member
I run 89 octane, the fact is, the higher the octane the slower it burns, thats where you need higher compression to create more heat to make the higher octane burn at the correct rate, I dont know about all years, but mine is 9.6 to 1 in stock form, 100 octane will not help it run better, if anything it will actually hurt performance due to stock compression, so dont waste your money on higher octane or those octane boosters you dont need.
sh8kr
Member
Mad Dog,Vegas & Wildman are dead on about compression, one other critical factor is timing. If you don't adjust the timing then your gains will be minmal. Based on what these 3 have stated about controlled cylinder burn(the piston will be closer the ignition source), you must change the timing so that the point of spark is matched to the rate of burn ( need to retard timing).
But the higher Octane sure smells good in traffic.
But the higher Octane sure smells good in traffic.
vej
Active Member
From the '08 manual:
ONLY USE UNLEADED GASOLINE OR ETHANOL BLENDS (UP TO 10%) WITH
OCTANE RATINGS OF 91 OR GREATER. DO NOT USE FUEL ADDITIVES OR ANY
TYPE OF RACING FUEL. METHANOL OR METHANOL BLENDED FUEL IS NOT
APPROVED FOR USE IN YOUR MOTORCYCLE AND MAY RESULT IN FUEL SYSTEM
COMPONENT DAMAGE, ENGINE DAMAGE AND/OR EQUIPMENT MALFUNCTIONS.
ONLY USE UNLEADED GASOLINE OR ETHANOL BLENDS (UP TO 10%) WITH
OCTANE RATINGS OF 91 OR GREATER. DO NOT USE FUEL ADDITIVES OR ANY
TYPE OF RACING FUEL. METHANOL OR METHANOL BLENDED FUEL IS NOT
APPROVED FOR USE IN YOUR MOTORCYCLE AND MAY RESULT IN FUEL SYSTEM
COMPONENT DAMAGE, ENGINE DAMAGE AND/OR EQUIPMENT MALFUNCTIONS.
imthewildman
Member
its the same as putting a bunch of high performance parts on an engine that work against each other than together, example, say you have a real heavy car, put a full race cam thats designed for 4000 to 7500rpm's, 2800rpm tourque converter and a 272 gear in the rear, nothing here will make the max horsepower at the same time to the rear wheels, everything is basically working against each other, seen it time and time again while street racing, the stone stock car will smoke the car with all kinds of wasted dollars put in it, same as the high octane on a stock compression motor, just cause it makes one engine run better doesnt mean it makes all engines run better, engines need to have max cylinder pressure around 15deg after tdc, so therefore if you run a higher octane fuel on a stock motor the mcp will be after the 15deg it needs to be to get max hp, that means loss of power and nobody wants that.