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Before i bought the car i asked the guy what fuel it was tuned too, and he said Shell Optimax 98. So i try to fill up with shell all the time. I noticed when i fill up with 98ron fuel sometimes the pfc indicates it knocks. Last time i seen it knock was 195, i have seen it up to 200. So i decided to fill up with Shell Optimax Extreme 100. Since i filled up it hasnt knocked at all (About 12-15 knocks). Since Optimax Etreme is ethonol based for higher octane, for long term use would it be safe?

Cheers Anggi.

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whilst using higher octane fuel will take out knocking you should just have your tune fixed to suit 98 ron fuel. the powerfc faq (in my sig) will help you identify the knocking show you how to report it to your tuner

Guest Mashrock
  chunkylover said:
Before i bought the car i asked the guy what fuel it was tuned too, and he said Shell Optimax 98. So i try to fill up with shell all the time. I noticed when i fill up with 98ron fuel sometimes the pfc indicates it knocks. Last time i seen it knock was 195, i have seen it up to 200. So i decided to fill up with Shell Optimax Extreme 100. Since i filled up it hasnt knocked at all (About 12-15 knocks). Since Optimax Etreme is ethonol based for higher octane, for long term use would it be safe?

Cheers Anggi.

i beleive the question your asking about ethonol fuel, is yes its safe. but also its only been around for a short time i figure in these applications correct??

but from what i've been told its ok to run as long as its tuned to it.

  emsta2003 said:
still makes no sense dude........:D

Results 1 - 10 of about 6,030,000 for engine knock. (0.33 seconds)

If that makes no sense, it means it would have taken you just over a quarter of a second to get an answer if you'd gone and looked.

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