need bb Posted October 2, 2016 Share Posted October 2, 2016 Well I am moving and will no longer have access to 93 octane. I am tuned on 93 and I was wondering what changes I should make to my tune to accommodate 91 octane. Should I run a little bit richer? I currently run between 10.8 - 11.0 AFR.Should I run a little bit less boost at peak torque? With my 20G I currently peak around 21PSI.I know that I will have to lower timing. Any insight on how much I should take out? Thanks! Link to comment Share on other sites More sharing options...
fahr_side Posted October 2, 2016 Share Posted October 2, 2016 I'd lower peak boost a little, maybe come down to 18 or 19psi. Pull 2* across the board and see how it likes that. Don't touch fueling. 10.8 is already the edge of pig rich, and torque drops off very quickly below there. Had you thought of adding meth injection to avoid detuning? Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
Tuning Alliance Posted October 3, 2016 Share Posted October 3, 2016 You'll want to get your map updated for the different fuel, prob will have boost turned down a little for lesser grade gasoline. -Brian Contact us for all your tuning and performance parts needs! Etuning the legacy community since 2008! Follow us on FACEBOOK | INSTAGRAM [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
jay p Posted October 3, 2016 Share Posted October 3, 2016 Are you moving to a higher elevation where you can only get 91? If so you may be ok doing nothing, but should still have the tune fixed as mentioned. I live at 7000' and have no problems unless I drive to a lower elevation on the 91 octane gas. Jay Link to comment Share on other sites More sharing options...
xt2005bonbon Posted October 4, 2016 Share Posted October 4, 2016 Dang, you live at 7k feet? Must be a nice location! Link to comment Share on other sites More sharing options...
need bb Posted October 5, 2016 Author Share Posted October 5, 2016 Currently at sea level and new location is also at sea level. It looks like there is also E85 at some stations, but for now I want to make sure i am safe on 91. I will lower boost and timing and see how things look. Link to comment Share on other sites More sharing options...
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