100LL Fuel - Any repercussions?

[RandomHero]

Hey folks!
Wondering if there are any of you out there who know (legitimately) how lead can or will affect the FRS or BRZ exhaust system?

I have access to 100LL fuel (LL stands for Low Lead) and had considered running it as a high performance fuel. 100LL aka AVGAS is used in almost all piston powered aircraft. As you may have guessed, aircraft dont have CATs or O2 sensors. I have used 100LL in an old car before (78 Ford) but that was pre emission days.

Im also slightly curious if lead could have any effect on the soft metals in this FA20 engine? I'm still trying to get an engineer to find out what the valves and guides in an aircraft engine are made of. Almost everything is aluminum and the lead certainly doesnt hurt that.

Any takers on this debate?

[jeebus]

I'm sure it won't destroy your cats immediately, but eventually it will. I wouldn't run it.

[RandomHero]

yeah seems to be the consensus down at the hanger as well. Damn. Well, maybe ill get a full race exhaust and delete the Cats... thats a PITA though...

[xwd]

Yeah leaded gas, cats, and O2 sensors don't mix very well. Occasional use fine, but not every day driving.

[Tradewind]

Yep, you will write off all o2 sensors and cats in a short period of time. This would screw the ECU's ability to make car run efficiently as well

[serialk11r]

Originally Posted by RandomHero

yeah seems to be the consensus down at the hanger as well. Damn. Well, maybe ill get a full race exhaust and delete the Cats... thats a PITA though...

Bigger problem would be the O2 sensors, your ECU loses closed loop function and thus will have no idea how much fuel it's metering after a while. Actually I don't know how much they actually need to trim but just a few percent off can cost you a lot of power, or blow your engine.

[F3dzo]

[Sportsguy83]

Originally Posted by F3dzo

Attachment 14871

where's this?

[MattQ-WP]

AVGAS is an oxygenated fuel designed to be run at super high altitude.. not at normal driving altitude.. you CAN run it in pretty much any car but its octane (normally 100) doesn't behave exactly like 100 octane vehicle fuel would behave... the high oxygen content actually makes the fuel run slightly leaner at lower altitudes due to the ambient pressure PLUS the oxygen in the fuel

You WILL toast your O2 sensors, you WILL toast your cats.. you WILL feel a bit more power and then you WILL feel a big repair bill

I ran Avgas for a few months in my previous modded car and the net result was a cataclysmic engine failure... melted pistons... cracked block... oil in water, water in oil, cats and dogs living together... the end of life as we know it

[SkullWorks]

I'd stay away from lead and DI until I understood the effects of the high injector tip temperature and leaded gas were understood, that is really the only thing mechanically different, in a substantial nature, from any other normal gas internal combustion engine. I would worry about potential for build up or clogging of the very fine holes in the injector...I have no foundation for this, but I'm sure they were not worrying about leaded gas while proving out the DI fuel system....

other than that...there are the aforementioned cats, dogs??? and O2 sensors,

for which there are test pipes, dog biscuits??? and replacement intervals...the sensors will last a couple thousand to 10,000 miles depending on how rich the motor runs......

[NeedsmoreCowbell]

i like it in the lawn equipment but i blend it

[Guillaume]

I'll just leave that here http://jalopnik.com/5938552/why-you-...el-in-your-car