Running Avgas in the S2000
02-09-2006, 04:13 AM
#21
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When I was mixing Unocal 100 octane with their 91 to get rating somewhere between 95 and 98 (don't remember the ratio, there was a chart on their website) what I mostly noticed was what seemed to be better throttle response. I do believe it pulled a little harder too. I remember Unocal's advertising saying that their 100 had a lighter specific gravity than their 91 although they were linear and you could mix the two.
What does "lighter specific gravity" mean? Does the fuel atomize better?
What does "lighter specific gravity" mean? Does the fuel atomize better?
02-09-2006, 05:03 AM
#22
Originally Posted by slipstream444,Feb 9 2006, 12:39 AM
My baseline octane was 93 and I added 101 unleaded race gas in varying mixtures up to full 101 over that time period. My car ran fantastic between 95 and 97 octane.
AKI which is an average of RON octane rating and MON octane rating which are two different tests under different conditions, and the average of both gives an indication of detonation resistance over a broader usage. It is estimated that if the 93 gasoline was subjected to a RON test it would have about a 98 rating.
All the 101 unleaded gas I have seen is based on a RON rating, not the broader average. I would think that the blend you were coming up with might be close to 100 RON, but an unknown AKI rating. Not the 95 - 97 that you are estimating.
02-09-2006, 06:15 AM
#23
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Originally Posted by S2oooNvegas,Feb 8 2006, 03:51 PM
chiming in*
agreeing with whats been said and a few more tips. AV gas is strictly that. as most aviation engines run at a nice fixed ,and relatively low RPM band. so you dont have the dynamic compression band that you would on a street engine, not to mention the very low intake temps they live with. just these 2 combined should help you to get the point. do not run AV gas in a car...EVER. this is hillbilly tech. LOL. later dave
agreeing with whats been said and a few more tips. AV gas is strictly that. as most aviation engines run at a nice fixed ,and relatively low RPM band. so you dont have the dynamic compression band that you would on a street engine, not to mention the very low intake temps they live with. just these 2 combined should help you to get the point. do not run AV gas in a car...EVER. this is hillbilly tech. LOL. later dave
ok really im jk. but i haven't argued with dave in a few hours, so we have to keep the pace going.
02-09-2006, 07:40 AM
#24
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Originally Posted by slipstream444,Feb 9 2006, 12:39 AM
Resetting the ECU allows it to adapt to the fuel a little more quickly. The ECU does have a learning cycle, but it's not that long. Resetting the ECU just speeds up the process a little.
Higher Octane gas is not more aggressive, contain more energy, or directly give you more power.
Higher Octane gas is not more aggressive, contain more energy, or directly give you more power.
As for using the word "aggressive" with respect to the fuels octane, you're absolutely right, that was a poor choice of words on my part.
Drive Safe,
Steve R.
02-09-2006, 10:13 AM
#25
Originally Posted by cdelena,Feb 9 2006, 08:03 AM
I question that you really knew what octane you were experimenting with.. the 93 gasoline we buy here in the states is an AKI (anti-knock index) rating.
AKI which is an average of RON octane rating and MON octane rating which are two different tests under different conditions, and the average of both gives an indication of detonation resistance over a broader usage. It is estimated that if the 93 gasoline was subjected to a RON test it would have about a 98 rating.
All the 101 unleaded gas I have seen is based on a RON rating, not the broader average. I would think that the blend you were coming up with might be close to 100 RON, but an unknown AKI rating. Not the 95 - 97 that you are estimating.
AKI which is an average of RON octane rating and MON octane rating which are two different tests under different conditions, and the average of both gives an indication of detonation resistance over a broader usage. It is estimated that if the 93 gasoline was subjected to a RON test it would have about a 98 rating.
All the 101 unleaded gas I have seen is based on a RON rating, not the broader average. I would think that the blend you were coming up with might be close to 100 RON, but an unknown AKI rating. Not the 95 - 97 that you are estimating.
02-09-2006, 06:41 PM
#27
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Originally Posted by slipstream444,Feb 7 2006, 01:30 PM
It blows my mind how many times this kind of post creeps back from time to time. Bottom line - Av Gas is not good for your car.
Leaded gas will cause all sorts of problems with just a few uses. Cats and O2 sensors are just a couple examples. Modern valve seats are not designed to run a leaded gas.
Additionally, anything over approximately 98 octane will actually start to slightly hurt performance in a N/A S2000.
Free is not 'free' if you have to repair the engine and other components.
Frankly there is no place on the planet giving away gas, so this sounds like bull from the get go. Av Gas is very expensive and the only way you'd get it for free is if it was contaminated, stolen, or Daddy owns the FBO where you work ... and that's still stealing - it's just called embezzlement.
I'm a pilot (military), work out of an international airport (where we operate overseas) and one of my ground jobs involved managing the fuel funds. If I were getting fuel for free they'd call it stealing and Court Martial my butt. Fuel is expensive all over the world my friend and no one gets it for free.
Say you're getting it for free (for some crazy reason - and I don't care to hear your explanation) - here's food for thought:
What if they were offering diesel fuel for free - would you put that in your car?
Better yet ... I'll give you a few gallons of piss for free ... try that in your tank.
Point - Av Gas is specifically designed for aviation engines and is no more appropriate for your car than diesel - or piss for that matter.
Final note - if you get caught running leaded gas (or running without a cat) on the street, you may loose a lot more ... some states will gladly take ownership of your car.
Leaded gas will cause all sorts of problems with just a few uses. Cats and O2 sensors are just a couple examples. Modern valve seats are not designed to run a leaded gas.
Additionally, anything over approximately 98 octane will actually start to slightly hurt performance in a N/A S2000.
Free is not 'free' if you have to repair the engine and other components.
Frankly there is no place on the planet giving away gas, so this sounds like bull from the get go. Av Gas is very expensive and the only way you'd get it for free is if it was contaminated, stolen, or Daddy owns the FBO where you work ... and that's still stealing - it's just called embezzlement.
I'm a pilot (military), work out of an international airport (where we operate overseas) and one of my ground jobs involved managing the fuel funds. If I were getting fuel for free they'd call it stealing and Court Martial my butt. Fuel is expensive all over the world my friend and no one gets it for free.
Say you're getting it for free (for some crazy reason - and I don't care to hear your explanation) - here's food for thought:
What if they were offering diesel fuel for free - would you put that in your car?
Better yet ... I'll give you a few gallons of piss for free ... try that in your tank.
Point - Av Gas is specifically designed for aviation engines and is no more appropriate for your car than diesel - or piss for that matter.
Final note - if you get caught running leaded gas (or running without a cat) on the street, you may loose a lot more ... some states will gladly take ownership of your car.
This thread should have ended with it.
02-09-2006, 11:11 PM
#28
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Originally Posted by MattG,Feb 9 2006, 04:35 AM
I just got home from a big night out drinking...will my piss be able to power my car now? Should I add an octane booster to it?
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