Quote:
Originally Posted by CSI:86
I agree. buts it weird that i pinged on 95RON/91. Maybe it was because i redlined every single traffic light. Has anyone else had issues with 91 in their car, and redllining it frequently?
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Nope. 91 is the only stuff available out here, and it's ONLY E10 due to EPA regs. ACN91 is what we call it (Arizona/California/Nevada 91 octane), and it's some of the crappiest 91 octane gas around. It's utterly despised crap.
But I've never heard it cause my engine to ping. Not even before I got the engine ECUTek tuned to run on 91. Of course it runs better now with the tune than the stock tune (since the IAM isn't regularly dropping to .7 or .8 any more), but even before then, I didn't hear anything bad.
These engines have to be able to run reasonably well on 91, as it's the best stuff aside from expensive 100 octane race gas or e85 (if tuned for it) that we can get. The car is tuned for 93, but with allowances for 91 b/c of certain idiotic regs in certain states like CA, which supply much of the gas to AZ.
I'd like to run 93, but it's probably not that much of an improvement now that I'm already custom tuned.
But putting 87 regularly in these cars is a BAD idea. Just b/c the engine can compensate doesn't mean it's okay. The engine pulling timing like it will on 87 isn't "auto-tuning", but more like "last ditch failsafe" that is used to save the engine from undergoing serious damage. Sure you won't notice except maybe a slight HP loss, but unbeknownst to you the ECU is working to keep the pistons from melting. It's repeatedly pulling timing as every time it tries to return to normal, it gets knock. No you won't soon blow up the engine, but it's not healthy for the engine in the long run.
A single tank of the stuff won't hurt it in the long run if you're careful while it's in the tank, but running it long term is NOT good. Run what is specified or get tuned for alternative fuels (such as 100 octane race gas or E85). Do NOT run the a 91/93 tune on anything but 91 or better in the long run.