The last time I filled my car up, I went with 89 instead of the usual 93 that I always run, because of the huge increase in fuel prices. Premium here is $2.55 a gallon. Anyways....I think I could actually feel my car bogging when it kicked the timing down. I was headed up a ramp, (my car is an auto), kicked it down about halfway to shift in 2nd gear, and the miniute I did I heard some pinging, and the car kinda bogged down. I have the Hypertech Power Tuning installed, so I'm sure that's making it even worse. Just curious as to what you all thought, and if you're still running 93 even with it being higher.

 

I am running 93 all the time but mainly because I have to, I have 93 octane power tuning from MadZ28. It's not all that bad around here though, think I pad 2.25/gal yesterday. But yes with the high compression that LT1s have it most likely is pulling timing if you are running less than 93. Personally, I ran 93 even before the tune.

 

if you heard some pinging you might want to check the plugs as the ping can be detonation which can foul the plugs.

even at high altitude I use 91 octane, mostly because mid-grade here is 87 and regular is 85. if mid was 89 I might try to see how the car would handle it, but not 87.

 

As hard as LT1 plugs are to get to, I am not anxious to check them, so I probably won't, unless I notice some missing or rough idling.

 

I doubt that one tank of 89 is going to foul out your plugs but you definitely want to avoid pinging with your LT1. By the way 91 octane here in CA is $2.75 per gallon

 

yea but your standard of living is definately higher out there...

 

You gave up at $2.55? I haven't had a job since I got out of the military in December and I still run 91. (91 is all we get out here, and for some reason it is still more than what most people pay for 93) But as soon as I started running out of money, my car breaks.

I'm just giving you crap man, only kidding with you.

 

LOL Yeah.....gave up at only $2.55

 

I run 89 on my stock tune and have never heard knock and have checked it several times with my scanner. No knock problems.

I was going to start my heads/cam swap, but these gas prices are making me wonder if I should wait.

 

By 'no knock problems', are you implying no knock counts recorded, and no timing corrections?

FFT, there are various 'degrees' of detonation. Not all are damaging, or even bad.

According to a previous thread, burning a low octane gas may 'taint' the ability of the PCM to return to a 'no knock timing' table in pcm software, once premium is again put in the tank. This problem would then occur for the life of the present knock module. More FFT.

 

I have never heard of that. So you don't think that the timing will come back around to what it should be if you run 93 after running 87 or 89?

 

Well if that is the case, I think I need to change my KM. The guy I bought it from ran 87 for 2 years. I guess I will look into that.

 

To make myself more understood, the point being, IF indeed knock counts/knock and subsequent timing retard were encountered with the use of the lower octane fuel, then would it apply. That is how I interpreted the referenced thread. Read the thread, and make your own determination.
http://web.camaross.com/forums/showthread.php?t=351777
It's necessary to read entire thread, guys.