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mainline dyno tuning rb26

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having an issue when tuning on mainline dyno i start a run runs perfectly no issues hits 326 hp go to smoothen out the table wot for fueling all of a sudden she breaks up here and there go back to the last run map and still does it please help

Are you running out of fuel? Often that shows up on the dyno as a bad run, that when you back up is still bad. Look at fuel pressure, (and the fuel gauge if it's a street car!).

thanks ended up being too much fueling actually the dyno o2 and the actual were way off and the primary was sticking at times new wideband and pulling fuel helped out alot lol thanks