Thanks!

 

Leaded fuel is actually better for the motor...the only things it damages are the cat, and the O2 sensors...


true factory ECU can't had anything with higher octane fuel if you aren't pulling timing. But any tuneablity and you can add power. Those against it may not really understand what it is. It's just like any other gas with some lead in it...its obvious why/how it could destroy at cat and clog O2 sensors over time...but everything else about it is good.

 

true, the engine will run cleaner and all that... but paying for new 02 sensors isnt cheap.... and was asking about air plane fuel whic has like 4 times the amount of lead than normal leaded gas has. Thats what I picked up from that article I linked atleast...

 

I'm a pilot...its what I do. The leaded gas that is run in Cessna's and general aviation aircraft is not heavily leaded...that is the reason it is called 100LL the LL stands for Low Lead.

I mean, there is a chance that I am wrong...but comparing Av 100LL to some other leaded race fuel, I would guess that Av Gas has much less lead. What I can do is research that to confirm it. I'm currently going to school so I could have a definite answer by Tuesday hopefully (only have Tue,Thurs classes 15crd.) one of the classes is turbine engines so I can ask that professor...I'll also ask my Aerodynamics professor, and then to make it more secure I'll ask both my flight instructor and my ground school instructor (instrument ground school).

That should be enough...I'll also do some other research on it.


Now back to the O2 sensors, your right its not cheap to replace them...I have the AEM UEGO sensor running my car right now...supposedly it should last something like 60k-80k or maybe even more miles running on normal unleaded fuel and keeping it 36" from the head, at an angle of at least 10 degrees above horizontal...and I think it says something like...ok I found it

80,000 km for Unleaded fuel
50,000 km for Leaded fuel 0.15g Pb/l
20,000 km for Leaded fuel 0.40g Pb/l
10,000 km for Leaded fuel 0.60g Pb/l

you can see it does shorten the life greatly...however if you understand how an O2 sensor operates you can understand how it fails. The stock O2's bounce between rich and lean indicating a stoich mixture...think of how fast those blinky light A/F gauges bounce back and forth. Now running leaded gas for a long period of time will make that light go back and forth much slower. In the case of a wideband, indications change much slower. But if you haven't run much leaded fuel, say only one tank. Then you run many tanks of normal unleaded fuel through it you will "clean" the O2 sensor back up and it will be good to go again. Of course, the life still wont be as good as only running unleaded, but with a low lead content (.15g Pb/l) and running a lot of unleaded in between you could bump that number up to 65-70

 

you wouldn't want to run higher then 100 wih the cat on anway. it'll burn everything through it, and you'de basically have a straight flow cat .

With the current anti foiler mods I wonder if the worry for the O2 going bad can be taken away.

 

nobody cares about the secondary O2...its only purpose is to see how the cat is running. What everybody does care about is the primary O2 which basically runs the car in closed loop mode

 

ah i c. when I heard CAT and o2 in the same sentence I figured you guys were talking about the secondary.

 

is any one thinking about getting a/f ratio gauge or anything like that...


I also am thinking of getting the megan header, any comments?

 

AEM UEGO

From the previous dyno i remember seeing posted, it seems like the megan header makes good power for it's price

 

Is it overkill to run A/F ration sensor's on a N/A car/?

Yea, I saw that dyno, but that was published my megan so I dont know if i should try it or not...