If i'm not mistaken leaded is bad.....you should have no problem with unleaded.

 

so you ran 87 in a car that wanted 91+ didn't you notice the knocking on the m3 engine when you drove ?

 

Sunoco carrys 100 octane . My suggestion is you need to tune your car with 100 octane rather than blending with unleaded racing.

 

Here's a chart to help you figure it out
http://www.osbornauto.com/racing/blend.htm

 

Any of the local tracks or drag strips... SP, VIR , etc...

 

You can purchase an ECU reflash for 100 octane but you'd have to burn it all the time.

I don't think mixing fuel at that price makes sense.

If you had your ECU optimized for 91 you'd notice an improvement in performance and fuel mileage w/o having to burn the higher octane fuels.

 

The computer will adjust for the lower octane - less power though.

 

I'm in FL and we have 93 octane here and I still get a second of slight knock upon initial accleration every once and a while. I think the car's stock ecu will even further advance the timing a bit for octane beyond 93. Some on Rennlist have added octane booster and the slight split second of knock goes away and the car performs much better according to them.

 

You are grossly mistaken. The EPA required traditional "pump" gasoline to have less than 0.10gpg of lead content as of January, 1986.

Leaded gasoline destroys your cats and O2 sensors... which is why virtually every modern car is badged "Unleaded Fuel Only".

 

And your fuel filter ..

If your going to run racing gas .. make sure its unleaded(it will be lower octane).

 

That's OK for a motorcycle with no cat - I've used it too...but don't use it your P-car - LL stands for "low lead" and lead will kill your cat...and any warranty.

 

Must be one of those urban legends that lead kills cats. I had been running 100LL in my Harley in Texas and it was very easy to go to the local airport and get my 5 gallon can filled. When I moved to Colorado, I tried taking my 5 gallon can to Centennial airport and they looked at me like I was crazy - said no they wouldn't sell me LL and besides that it was illegal. I asked where someone could go and get it they needed it and they suggested Jeffco airport and said they had a self service pump - which they did but if you've seen the nozzels that airplanes use you'll understand the difficulty I had filling my little red can - anyway I still wouldn't use LL in my car - sounds like you've had good luck.

 

What happened to Lardog's posts on using 100LL - maybe he was worried his dealer would see he was using leaded gas

 

 

Back in the late 70s when we didn't know any better, my step-brother was filling up his Chevy Blazer from the leaded tank we had out on the farm for the tractors etc. He had cut out the little restrictor they put in the nozzle to keep you from doing that. Anyway long story short, he's driving down the road about 6 mos later and smells something burning: the converter had gotten so hot it burned up the carpet on the pass side of the truck.
I was convinced.