does anybody know if they are bad for our cars?

i put some in my last tank full

before i on my turbo timer my fastest time for 0-60 was 5.08

but today i raced a couple of friends on the county airport and i got 4.68!!!

since the last time i tried to time mine i have put on my home-made earthing kit and the octane booster ( NOS off-road booster that should raise the octane 7 points) i mixed the octane booster with 93 octane gas

now im not saying that the turbo timer is acurate but i still think that it was pretty fast, at least under 5 seconds

does this seem fast to you?

my car is stock accept HKS type 1 TT and earthing kit?

 

Many over-the-counter octane boosters use MMT's (Methyl Manganese Tricarbonyl)as an active ingrediant to raise the octane rating.

MMT's coat everything(plug electrodes, valves, turbine wheel, 02 sensor, and cat) with a red/rusty colored film.This red coloring is the manganese film deposit (think manganese as an alternative to lead). This can cause maintenance problems, and if the ratios of MMT's is too high the cat can become clogged.

Here's another bit of info. In order to truly get an even mix when adding octane booster's, the fuel and booster should be mixed thoroughly in a seperate mixing can before fueling the car. Just dumping a can into a half empty tank and adding some more fuel does not guarnatee a good mix.

The result could be an uneven fuel octane delivery providing the base octane at one point, maybe well mixed at another, and an overly concentrated mix at another point.

BTW- The Evolution VIII owners manual specifically warns against using octane boosters with MMT's.I have said this before but to reiterate,if a Mitsu service tech pulls the plugs on a car that has been using MMT mixed gas they will be able to tell by the tinted coloring of the plug electrodes.

I think toulene and xylene are probably a better bet, but more difficult to acquire, more messy to deal with, and more dangerous to store. In addition fuel companies often add toluol and xylene to their high octane fuels to begin with so you have to be careful of how much more you add as there are limits (25% total I believe?).

Here are a few links to read.

http://www.idavette.net/hib/fuel/

http://www.epa.gov/otaq/regs/fuels/a...e/mmt_cmts.htm

http://elektro.cmhnet.org/~charlie/p...i/toluene.html


Here are a