When I lived in NY, many Sunoco stations had 100 octane available (besides their usual recipe of 87-94 blends).

 

In the UK we can get 95 to 98 RON levels, you can buy a booster to raise the Octane levels. I've been told its not too great to, but you do get some great results. I've recently just used it on a rolling road day along with shell optimax (98 RON). I have a JAP import and buy adding 100RON petrol I produce close to 247BHP instead of the 237BHP the S2000 supposed to produce in the UK. Try millersoils.com. I certainly noticed a difference when using it, the car seems more responsive and I was able to push out as much BHP on a rolling road day as some of the other board members did who have quite a few Mugen mods.

 

I can get 100 or 110 octane at three different gas stations within 1 mile of my house in Maryland. I do live a few miles from a drag strip so check around any local tracks and I am sure you will find the higher octane stuff.

Mark

 

You have to tune your car to use 100 octane efficiently. I've seen a car lose hp on the dyno using 100 octane when he wasn't tuned for it.

fltsfshr

 

When I ran 117 oct I had to change the timing on the car.. Otherwise it has no benefit but it will wear parts out faster like the O2 sencor.. You use the higher oct to get more agressive on timing so can get more horsepower and you dont have detonation..I pay here for 117 oct $8.05 per gallon..I love the smell of race fuel..

 

Hi All,
I'm a bit new here, but I'm fairly certain you can ruin your O2 sensors on any car, as well as your catalytic converter, by running such high octanes for extended periods of time. Gas stations do mix the high octane with the low (91 + 87/2) = 89, to get medium grade gas.

 

I remember reading an article some years back, in "Hot Rod" I think, on racing fuel where they stated that without modifications to take advantage of increased octane such as advancing timing or increasing compression there is no power to be gained. This asumes that knock is not a problem with non-racing fuel. There is some advantage to be had with legitimate racing gas however. I was told by a Union Oil rep that racing gasoline is a "summer" blend and does not have some of the long life addditives of normal pump gas. This tends to allow it to vaporize more quickly and completly, giving better throttle response. This improved throttle response accounts for the apparent increase in power as measured on the butt dyno. My own experiments a few years ago autocrossing an 89 Civic SI tended to support this. The question is whether a slight increase in throttle response justifies $2-3 a gallon more in price? Oh, it does smell good when it burns

 

Hobby

Just find a cheap source at a paint store for toulene and mix your own race fuel. That's lots cheaper.


fltsfshr

 

[QUOTE=d.h,Feb 23 2005, 11:05 PM] Correct me if I'm wrong, but aren't you not suppose to mix different octance which can cause damage to the car, or is that just my misconception?

 

I burned my CAT. up with Klotz 113 race fuel. Now I Don't have a CAT. and run race fuel all the time. It makes a big diff. with FI.

RAT