89 octane=retarded timing?
04-17-2005, 01:47 PM
#1
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89 octane=retarded timing?
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. 
Last edited by brians96Z; 04-17-2005 at 01:50 PM.
04-17-2005, 01:53 PM
#2
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Re: 89 octane=retarded timing?
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.
04-17-2005, 02:21 PM
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Re: 89 octane=retarded timing?
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.
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.
04-17-2005, 04:51 PM
#4
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Re: 89 octane=retarded timing?
Originally Posted by DavesLT1
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.
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.
04-17-2005, 09:02 PM
#5
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Re: 89 octane=retarded timing?
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 
04-17-2005, 09:43 PM
#6
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Re: 89 octane=retarded timing?
Originally Posted by OBE1 95Z28
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
04-17-2005, 10:03 PM
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Re: 89 octane=retarded timing?
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.
I'm just giving you crap man, only kidding with you.
04-18-2005, 12:36 PM
#9
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Re: 89 octane=retarded timing?
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.
I was going to start my heads/cam swap, but these gas prices are making me wonder if I should wait.
04-19-2005, 10:48 PM
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Re: 89 octane=retarded timing?
Originally Posted by RE AND CHERYL
I run 89 on my stock tune and have never heard knock and have checked it several times with my scanner. No knock problems.
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.
04-19-2005, 11:56 PM
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Re: 89 octane=retarded timing?
Originally Posted by arnie
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 guess I will look into that.
04-20-2005, 04:16 PM
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Re: 89 octane=retarded timing?
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.
http://web.camaross.com/forums/showthread.php?t=351777
It's necessary to read entire thread, guys.
Last edited by arnie; 04-20-2005 at 04:21 PM.
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