Compression, 91 octane and Pinging?
#1
Compression, 91 octane and Pinging?
Any of you guys in Ca run a high cr (11.2 or higher) using 91 octane and still get pinging? My comp is at around 11.1-3 and pinging is really bad. I've tried different gasoline 76, Chevron, Shell and with some octane boost and it still bad. Even retarded timing to 12 degrees and it still pings. Im thinking it may be because of the Skunk program? Anyway, any help or suggestions would be helpful. Thanks.
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Re: Compression, 91 octane and Pinging? (G S R)
What kind of pistons?
With 11.4:1 compression I had no pinging whatso ever on 91 octane and 17 degrees timing. Endyn pistons, but with big cams (lots of overlap which reduces compression)
Ill be at 12:1 CR tomorrow...hopefully it wont ping.
With 11.4:1 compression I had no pinging whatso ever on 91 octane and 17 degrees timing. Endyn pistons, but with big cams (lots of overlap which reduces compression)
Ill be at 12:1 CR tomorrow...hopefully it wont ping.
#3
Re: Compression, 91 octane and Pinging? (G S R)
Try using your stock ecu or another ecu. 76 has 100 octane, but I know couple of people running about the same compression with no problems. If all else fails keep retarding the timing and visit dynospot.
#4
Re: Compression, 91 octane and Pinging? (HX_Guy)
Im at 11.2-3 with Us Itr pistons and a .040 mill. Cams are Skunk's. What kind of gasoline do you use. Also with your new cr what will you use? I dont know why mine is pinging, could it be anything else?
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Re: Compression, 91 octane and Pinging? (ITR#132)
Try using your stock ecu or another ecu. 76 has 100 octane, but I know couple of people running about the same compression with no problems. If all else fails keep retarding the timing and visit dynospot.
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Re: Compression, 91 octane and Pinging? (xlr8si)
im at about 12:5 compression i think. Well over 250 on a compression tester... I run 10 degrees timing and dont ping. I run type r cams. with the intake cam gear at +1degress and exhaust at +3 degrees
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