Hey guys, I have a j-spec s5 with a microtech lt-10 that's been dyno tuned and recently (last night) my serpentine belt ended up flying off, anyways... got the car home off just the battery, it ended up dying; pushed it the small distance i had left to my house, replaced the belt the same night but today when i took the car out it didnt feel right. So my question is when the battery died/alternator wasnt working did this negatively affect my tune?

any help would be appreciated.

 

shouldn't have affected it. it has flash memory. probably in your head.

 

You know that belt drives the water pump as well?
you may have overheated it?