Hey just wondering about running this fuel in the S. I ran it quite frequently in my previous RX'7 's (perks of working at an airport), not all the time though. But then again i knew that engine inside and out and just felt comfortable with it. Im relatively new to piston engines and cyl. heads, but I would tend too think it would be OK. As long as there are no catalytic converters obviosly.

Really just want some feedback if anyone has done it before or not.
BTW 100LL means 100 octane Low Lead.

Mike

 

if im not mistaken...the ecu will just run like its 91 octane...but im not too sure, thats just what ive heard. might have to tune and what not.

 

Any leaded fuel will coat the 02 sensors with lead and lead to early sensor failure.
O2 sensors run about $200 new.

If used on a car with a convertor the lead will destroy the convertor, melting the catalyst bed in the process.

Unless the ignition timing is tuned to take advantage of the higher octane, you're wasting the $ on higher octane fuels.

Not to mention de-icer isn't required in automotive fuels.

No real perfomance gain to be had, and it destroys parts. Not a good combination.

 

Well its free, and there is no deicing additive in avgas. This is gasoline, not jet fuel which may or maynot have an additive. I plan on taking off the converters as i did in my RX7 and had no problem. So that would not be an issue.

Any other info....

 

Avgas is a slow burn fuel and in my experience with Toyota race engines requires 5 to 7 degrees more advance at full noise.

If you cannot add this advance, your exhaust temps will increase as more of the charge will still be burning when the valves open.

In most cars this is not detrimental. I know of one guy who put Avgas in his Turbo SAAB and the exhaust valves got so hot the head fell of one. Made a bit of a mess.

I suppose borrowing a line from Dirty Harry, you have to ask yourself "Are you feeling lucky?"

I like using Avgas as it is very resistant to detonation, smells great, and due to the scavenging agents in it keeps the plugs, oil, pistons, combustion chamber and exhaust ports very clean. I havent tried it in a F20C.

Chris.

 

You'll still have short lived 02 sensors.

 

100LL avgas. The "LL" stands for "low lead." From what I was told when I learned to fly, even though this fuel is labeled "LL," it's still still got more lead in it than standard leaded automotive gasolines had back when they were available.

Slows2k is right. If you run this fuel, you'll cook your O2 sensors. You'll also plug the catalytic converters too. What little bit of performance boost you "might" get running 100LL avgas is not worth the maintenance hassles you "will" have down the road after the fact.

It's your car.

Good luck,
Steve R.

 

Exactly right.. it has half the lead of avgas, but that is still four times as much lead as automotive fuel.

 

Why not just run 100 Oct unleaded? If you don't have a station near you, you can always order drums of it.

As much as I was a proponent of anything over 91 Oct making little difference, I will say that after running 100OCT (and resetting the ECU) that it did appear to make a noticable difference. However we all know the butt dyno tends to be miscalibrated.

 

^^Because he's getting it for free.

Another question is; are you running higher compression pistons or F/I? If not, IMO the fuel doesn't seem like it's worth it.