ThatGuyThere 54 Report post Posted February 5, 2021 The placebo effect is always something to behold in threads discussing fuel. Share this post Link to post Share on other sites
NJay 10 Report post Posted February 5, 2021 Depends on what you mean. My supercharged celica running PowerFC ECU displays knock sensor output and flashes the CEL rapidly if it goes above a threshold. Anyway, It's tuned to use vpower. I got caught out once and had to use regular unleaded. The knock sensor increased significantly when I gave it beans with the unleaded so there was no placebo effect just cold hard fact and a busted engine if i didn't heed the warning lol Why didn't it retard ignition? Well, It's not as sophisticated as stock ECU (or syvecs alternative) so cannot retard ignition in the event of knock. Its not usually an issue but glad I had it showing that day Share this post Link to post Share on other sites
MartinT 514 Report post Posted February 5, 2021 3 hours ago, Adamd said: The placebo effect is always something to behold in threads discussing fuel. Nothing to do with placebo, which requires an expectation of outcome. Share this post Link to post Share on other sites
nerdstrike 186 Report post Posted February 6, 2021 Quite apart from the great fuel debate, I wonder if the learned trims have an impact on a fresh tank of fuel from a different provider. I wonder if we only observe differences between the brand we've used consistently and others, irrespective of which it is. A few hours of varied driving ought to be enough to correct the trims. There's also the fact that our experience between tanks is from week+ old fuel to fresh, and human perception is notoriously unreliable when the comparison is not immediate. It's a tricky business! All the more so for you peeps with the custom tunes. Share this post Link to post Share on other sites
KevinA 695 Report post Posted February 7, 2021 Engine out on a bench dyno is where we did our fuel tests on a turbo engine. Share this post Link to post Share on other sites
