Octane
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Joined: Aug 2003
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From: Imperial Valley
Octane
I have read on numerous EVO sites where people have seen on average 10whp by switching from 91 to 93 octane gas. Now here in CA where I live we only have 91, so I gave 104+ (street red bottle, $5.99) According to 104+'s site there is no MMT in this additive, and I have put in two bottles to see if I could tell a difference. This product is supposed to raise octane 4-5 pts, and the 108 race version 5-6 pts. I have noticed a NOTICABLE improvement in performance. Granted I have not thrown my car on a dyno, but the car seems peppier, idles smoother, and is more cost effective than buying "trick" race gas for $4.99 a gallon. As long as I can afford it, I will throw this in every tank, that is how strongly I feel about it. Give it a try guys.
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Joined: Jul 2003
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Those 104 octane boosters aren't exactly what they appear to be. The 4-5 points they talk about are TENTHs of an octane. You were most defiately not running the equivalent of 104 octane based on the instructions on the side of the bottle.
Your best choice to economically create 93 in CA is to buy 100 octane gas (believe me, it's not trick stuff) from the pump and mix it with 91 OR put in some Toulene. Do a search here or on the internet for Toulene, you'll find the formula for mixing up a desired octane.
Your best choice to economically create 93 in CA is to buy 100 octane gas (believe me, it's not trick stuff) from the pump and mix it with 91 OR put in some Toulene. Do a search here or on the internet for Toulene, you'll find the formula for mixing up a desired octane.
Last edited by Pete_S4; Aug 15, 2003 at 07:01 AM.
I ran the numbers for mixing 91 and 100 octane gas, assuming a 14 gallon tank capacity and here's the results:
3.1 gallons 100 octane = 93 final octane
6.2 gallons 100 octane = 95 final octane
That is assuming you put in the race gas first and then fill the car the rest of the way up with 91 octane. You can see it's starts getting expensive trying to get even a 95 final octane.
Of course after you do this once, the octane of the gas sitting in the tank will be higher, and depending on how much gas you have left when you fill up again will require less race gas.
I'll leave you with a couple of simultaneous linear equations, for people that still remember math so you can run the numbers for other desired octane numbers yourself.
91 x + 100 y = 93 * 14
x + y = 14
91 & 100 are the octane values of the gas you're mixing and 93 is the desired octane.
14 is the capacity of the gas tank.
x and y are the values to solve for for gallons of race gas and pump gas.
3.1 gallons 100 octane = 93 final octane
6.2 gallons 100 octane = 95 final octane
That is assuming you put in the race gas first and then fill the car the rest of the way up with 91 octane. You can see it's starts getting expensive trying to get even a 95 final octane.
Of course after you do this once, the octane of the gas sitting in the tank will be higher, and depending on how much gas you have left when you fill up again will require less race gas.
I'll leave you with a couple of simultaneous linear equations, for people that still remember math so you can run the numbers for other desired octane numbers yourself.
91 x + 100 y = 93 * 14
x + y = 14
91 & 100 are the octane values of the gas you're mixing and 93 is the desired octane.
14 is the capacity of the gas tank.
x and y are the values to solve for for gallons of race gas and pump gas.