True, I'm aware it can pull out timing and cause pinging. Did it ever? Not severe enough for me to notice. Did it cost me power? Maybe. A lot? I doubt it.

My F4i has 12:1 compression and Honda recommends 86 octane or higher. I run 87 in that as well and it runs like a raped cheetah. No ping, no knock, and this bike, I beat the hell out of.

Premium fuel is over rated for daily driving as far as I'm concerned. I don't raw dog the car much. Obviously with the mods, I will run premium, but in the past I saw no need. It would have been money wasted.

 

not to threadjack but if the owner ran 87 in it before me would me running 92 w/o a tune make it do some of this?

 

yea.... great idea if you wanna fry your O2s with LEADED gas

Find a gas station with UNleaded 100 octane. That will work fine and pretty much balance you out. DO NOT use Octane boost or any other pointless promotional crap.

Check the color of your exhaust fumes to make sure you didn't blow a head gasket. You should be fine, but be careful. Don't tempt fate.

 

Sunoco race fuel, the purple stuff. Smells like toluene (model glue). I don't know what the proper name for it is. There's a gas station close to where I live that sells it to local hot rodders. I'm assuming that it is manufactured by Sunoco since that's the name on the pump. The station will not allow you to pump the race fuel directly into your car. You gotta pump it into a can and then dump it in. Leaded I guess.

Got curious and found this web site. This looks like it.

http://www.goestores.com/catalog.asp...15969&detail=1

 

[QUOTE=WheelmanZ28;4802554]yea.... great idea if you wanna fry your O2s with LEADED gas

Odd?? I've done it a number of times (twice in the Z) on different vehicles that have O2's without any issues. Most recently on my wife's old 94 Mazda. The car had been stored and the gas was stale so I added some 110 to get it to running smooth. Drove it to the gas station filled up. The thing runs great and gets 30mpg.

 

Leaded fuel does coat O2 sensors. They start to get lazy and inaccurate.

 

Ok, I believe you guys. I'll bet the reason that I haven't had any issues is because I don't run a significant amount of leaded race fuel mixed in (not very often) and it's only until I fill up with good 92 octane unleaded fuel. Not enough lead overall to plug the O2's up.

 

It depends on the O2 sensor brand too. Bosch will get lazy after 1 tank of leaded fuel. AC delcos will usually last anywhere from 4-8 tanks. Denso's will last about 8-10 from my experience with leaded in the GN, but these were of the non-heated O2 types. The heated O2s that LT1s have also ward off some of the lead coating better, a heated NGK O2 in my GN has lasted at least 50+ passes so far.

They eventually get "lazy", the O2 cross-counts should cycle from 0-255 in less than 90 seconds at op temp idle, or if your scan tool does not display o2 X-counts, the O2 mv readings should be very active at op-temp idle (closed loop)..if they are sticking to the same reading for more than 3-4 seconds then they are getting lazy and need replacing.

 

That's "leaded"..... still waiting for someone to show me the 110-octane UNLEADED

 

lol, it would be nice if such a beautiful thing existed

 

Sorry Injuneer, I misread you there. My bad. Sunoco does have 104 octane unleaded though. I did a little digging, check this out

http://www.proracingfuels.com/Product_MARK2.html

110 octane unleaded

 

werd, 87 ftmfl

 

Id never run 87 in my camaro, if you cant afford 2 or 3 more dollers on the fill up, I dont know how your affording gas in the first place. Leaded fuel will kill the o2's you just got lucky :P

 

Did your car have the premium gas tune as well?

 

I've often thought about running 87 if I'm going on a long drive and don't plan to put my foot into it at all. But I still have yet to fill up with anything less than 92.

Doesn't running 87 in our cars decrease fuel economy?
I'm sure I've read that the cost savings of the regular unleaded will be eaten up by the decreased fuel economy.
Maybe somebody could shed some light on that one for me.