Quote:
Originally Posted by Mandingo
Here's the email response I got from Uprev after asking them the same question with the same wording:
"The ecu will not adjust for octane your best bet is to get re tuned on the 91 octane."
I wonder if they mean performance will suffer on 91 octane so it's better to get retuned for that reason? I'll probably still just use octane booster instead of retune at this point.
Not the response I expected or wanted. Ha!
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They mean there's a good chance the motor will be knocking, possibly beyond the capability of the ecu to self correct.
It all depends on what your tuner did. If it's a ragged edge tune on 93, running 91 is a bad idea. If it's a very conservative tune, you might be ok. Just save yourself the headache and have your tuner make a 91 map for you so you can switch between both as needed. They can probably email you one with minimal datalogging required.
The stuff sold as octane booster doesn't do jack **** 99% of the time. They're almost all snake oil. Sure, it says it'll raise the octane 5 points. Great. Now you're running 91.5. Yay. If you have to go the diy route, use toluene. But, after a year, you'll have spent more on octane boosters than a quick retune would have cost.