Unless you own a JDM import or is highly modified ... I don't see a need for 100 octane use. Not necessary, just more like a faster way of burning cash up.

 

Don't knock it 'til you've tried it (no pun intended ~knock). I ran a tank of Sunoco 104 and my car ran great. Much smoother and definitely more power. I wouldn't run it day-to-day, but if you have a race or canyon drive or something to go on - it WILL make an improvement.

 

Thanks Rev I needed a little spiritual intervention..

 

Maybe I am just thinking of AV-GAS, but isn't 100 Octane a lead(low lead but it still has lead in it) product... which is bad for catalytic converters? That is why I won't put any in my Stook. Or am I just spreading rumors?

 

[QUOTE]Originally posted by Nimbus
[B]the higher the octane, the 'richer' it is, the slower it burns.

 

The gas is called

GT RACING Fuel --- From SUNOCO


I still like it to clean out the stook at least once a month, other wise you guys are right it costs too much..

I usually just use 94 from SUNOCO..

another .02 of mine..

 

A related question, then, is what about bottles of "octane boost?" They're much cheaper than a whole tank of 100+, based on your price. Is there a downside, assuming the chemical brew chosen is safe for catalytic converters (and, I would hope, O2 sensors)?

 

Most octane boost does not boost octane that much. I think there is a test report on http://www.mkiv.com. Our engines would benefit greatly from higher octane in the heat. The knock sensors would get triggered less and advance the timing as far as the ECU allowed, giving us close to the HP that is available only on cold days.

I think Sev should slap some reace gas in and go to the track on a hot day and see if he beats his original time.

My 0.02 anyway.

 

Ah, thank you Texan, this thread was beginning to scare me.

I can't speak for Sunoco, but I know Unocal's 100 octane unleaded race gas (which is available at the pump in some SoCal stations) is a much tighter blend than regular pump gas. It's constituent components are more tightly controlled for a quicker, more consistent burn which in and of itself can improve power, if for no other reason than the ability to retard the timing (yes, you heard me), but in our case it would be due to more complete combustion. The better anti-knock properties (not only higher octane, but other properties) are a bonus that we really don't need in the S2K, except perhaps in very warm weather.

In terms of octane boosters, their primary ingredient tends to be toluene. This is an effective booster, but to boost your octane rating about 2 points you need about 10% toluene/90% gasoline. Adding a 16oz bottle of 104+ octane booster to a 12 gallon fillup isn't going to cut it.

Like the Rev, I've run some 100 octane Unocal in my S2K, diluted with regular gas (about 50/50). Seemed to run better, but I didn't dyno. I have seen dyno's on totally stock engines such as the NA engine in the Supra/SC300/IS300 show 10 hp gains switching to 100 octane unleaded.

UL

 

[QUOTE]Originally posted by ultimate lurker
[B]snip...