Wondering if I could get some imput on running 100 octane fuel. not as a constant, but when racing. Unlike all those against it and those who dont see the point, i do take my rx8 to the drag strip. nearest roadcourse is 3+ hours away, and where I live its what everyone does. Biggest thing is whether 100 octane fuel is going to help/hurt, seeing as I'm just using the stock computer. Any help/wisdom's appreciated.

theren is no wisdom here on the subject, despite the opinions that will follow ...

Canzoomer was one of the old-school tuner gurus, he and I did some runs with fuel octanes as high as 117, with no power gains.

S

Why don't you make a few runs with 87, 91 ,93 & 100 Octane and post the time slips. Also 3 1/2 hours is not far to drive for a good road course. You will have more fun driving 25 minutes on a road course than 15.5 seconds in a straight line.

Once you get into 3-digit octane numbers you need to be tuned for it in order to get any value out of it. It won't HURT anything, it just won't help and with the money you save you can buy a couple of burgers at the track.

Once you get into 3-digit octane numbers you need to be tuned for it in order to get any value out of it. It won't HURT anything, it just won't help and with the money you save you can buy a couple of burgers at the track.

depends on what it is thats spiking the gas.

So how would one tune for the racing fuel in a way that would make proper use of it?

Actually the 100 octane fuel will help increase horsepower as it naturally burns more aggressively than normal pump fuel. I would use it for your racing even with stock ECU. However, as other fellow members suggested, if you get a custom tune for the fuel, you will get greater horsepower. But since you will drive your car on road everything, I won't bother for the tune just for using racing fuel.

Save the money you'll spend on a few dozen tanks of 100 octane and put the money towards proven HP increases.

It's easy to see who wasn't around for the 50 other times this topic has come up.

i appreciate the responses. i reckon ill prolly run it next time around just to see since noone seems to think it will hurt anything. as for what yall seem to think about the price of it, 100 octane is available here for 2.55 a gallon, aside from 3.09 for 93 at the gas stations. next track day for me a some buddies is on the 10th. ill post slips an pics after that. stock was 14.5's to 14.8's, depending on how well i hooked up, though i no longer have those slips and the cars no longer stock. i will put the times up after the 10th though.

When you say you use 100 "Race Fuel" does it say 'for off-road use only"?

There are two kinds of race fuel, one blended from high-octane components, it's OK. The other is just doped up with TEL, the old Lead additive - will destroy your cat and both O2 sensors quickly. Don't use in the RX-8, EVER.

S

Got the gift Stealth, thanks. They look pretty sweet even for a rather mundane part.

Charles - they actually fit better than stock!

S

Aside from one or two for myself, what would you like me to do with the others and can you get more?

http://www.rx8club.com/showthread.php?t=100333
and, specifically
http://www.rx8club.com/showpost.php?p=1557020&postcount=12

Are people simply disengaged from the process of discovery these days? I've tripped across sluggish people all of my life, but it seems the last 8 or 10 years have been riddled by individuals who are simply too transfixed by immediate gratification to even venture down the path of autodidacticism.

http://www.rx8club.com/showthread.php?t=100333
and, specifically
http://www.rx8club.com/showpost.php?p=1557020&postcount=12

Are people simply disengaged from the process of discovery these days? I've tripped across sluggish people all of my life, but it seems the last 8 or 10 years have been riddled by individuals who are simply too transfixed by immediate gratification to even venture down the path of autodidacticism.

ever thought of joining the thread killers club MM - you could be king.....

Nah. There will always be a "me too" after anything I post.
Usually the same sort of people that can't search...

yeah, me too

Ruhe!

Why don't you make a few runs with 87, 91 ,93 & 100 Octane and post the time slips. Also 3 1/2 hours is not far to drive for a good road course. You will have more fun driving 25 minutes on a road course than 15.5 seconds in a straight line.

+1 The closest track to me is 30 minutes but the furthest tracj is 3 hours. I've made that 3 hour trip 3 times this season.

I like that Avitar MM

depends on what it is thats spiking the gas.

That's completely correct.

Member Doctorr works at a refinery in Canada and he has had some good posts on the subject:

http://www.rx8club.com/showthread.php?t=6479&highlight=octane+xylene

He describes the octane rating as a "resistance to detonation" not really an indication of the power contained in the gasoline. High octane gas can and often is lower in power.

The secret is to mix your own with Xylene a high octane AND high energy gasoline that way you know what is actually going into the mix.

-Mr. Wigggles

http://www.rx8club.com/showthread.php?t=100333
and, specifically
http://www.rx8club.com/showpost.php?p=1557020&postcount=12

Are people simply disengaged from the process of discovery these days? I've tripped across sluggish people all of my life, but it seems the last 8 or 10 years have been riddled by individuals who are simply too transfixed by immediate gratification to even venture down the path of autodidacticism.

Threadkiller indeed.... I hereby dub you the King, The Führer, the ultimate Search Nazi.

Interestingly, the post you quote happens to be your own (cute, how many technical papers do you read where the author quotes himself). It doesn't really address Jason's question of whether he will go faster or hurt anything in his car by simply using 100 octane gasoline.

Try answering the person's question.

-Mr. Wigggles

Mr. Wigggles! -

Long time no see!

Thanks for the plug, I'm still around occasionally.
.
.
.
doc

Interestingly, the post you quote happens to be your own (cute, how many technical papers do you read where the author quotes himself).

I quoted myself because I had already answered that question a dozen times before.

It doesn't really address Jason's question of whether he will go faster or hurt anything in his car by simply using 100 octane gasoline.



Those posts absolutely answer the question of what octane does and doesn't do and what the outcome is if you use it but don't need it.

100 octane on a basically stock naturally aspirated vehicle? worthless.

heavily modified turbo cars with no cats can run leaded fuel with no problems. even O2 sensors can take the lead for a little while. OBD2 cars will throw a code a lot more quickly though. Lots of heavily modified cars run without O2 sensors though.

100 octane on a basically stock naturally aspirated vehicle? worthless.

heavily modified turbo cars with no cats can run leaded fuel with no problems. even O2 sensors can take the lead for a little while. OBD2 cars will throw a code a lot more quickly though. Lots of heavily modified cars run without O2 sensors though.

Finally some sense on the matter.

have posted this before but will post it again.

Back in the 60's, Curtis Wright where bench testing their own rotary engines for different fuel applications.

They tested their own RC2-60 engine with fuels rated from practically Kerosene to 102 Octane.

They found that from around 87 - 102 Octane showed a less than 2hp difference after resetting the carby jets for the correct fuel mix.. A piston engine would have pinged & died

I suspect the RC2-60 engines had a compression ratio of around 9.0:1 being the 60's but the theory still stands for the todays "Atmo" rotary engines.

Thats why I will only ever use the cheaper stuff in the RX-8 as the only difference is felt in the wallet.

REgards

as the only difference is felt in the wallet.



Except for those that have knock sensitive motors.

ive used 116 leaded and it was ok, the car would respond a lil bit more , but nothing big. and it destroyed my spark plugs and 2 cables. the tips of the exhaust got really white thought

ive used 116 leaded and it was ok, the car would respond a lil bit more , but nothing big. and it destroyed my spark plugs and 2 cables. the tips of the exhaust got really white thought


sure it did.. how did you cat fare?????

beers :beer:

COME ON PEOPLE!! Has no one ever heard of Mr. Pillowpants???? The troll that lives in your car's gas tank and will bite off the fuel pump nozzle if you try to fill up with anything less than 100 octane!! The little bugger almost took off a couple of my fingers last time I tried!!! I am not trying that again....

And don't even get me started on Listerfiend... Don't you dare put synth oil in her!