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If the injector pulse is at 5.0 then I am sure it will handle E40. That being said I would be curious to know what he did to get the injector pulse width that low? One way is lean the afr out and going from 11.8-12.0 to 13 afr would do it.
I would verify with your wideband what AFR you are seeing because it sounds like tuner leaned it out to drop the IPW's.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |