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MSD 2 step tuning

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Old Sep 24, 2012 | 02:47 PM
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1toofastlt1's Avatar
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Default MSD 2 step tuning

Do I need to do anything to my tune for the 2 step? when im on the 2 step my afr reads all the way lean. is this bad? I dont like lean
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Old Sep 24, 2012 | 03:04 PM
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reads lean because the spark has been cut and the fuel is being pushed into the exhaust without having been burned. since there was no combustion event the oxygen in the cylinder is pushed out as well. since an oxygen sensor doesn't actually read fuel, but rather, oxygen, it see's this added oxygen and reads lean even though it is technically richer due to the unburnt fuel.
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Old Sep 24, 2012 | 03:20 PM
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ok i see. Thanks for the info, it all makes sence now. and I guess a engine cant be lean with out spark. Thanks again.
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