rpm+speed help

[tsi2fly1991]

here is the problem my tach is broke and my car is cutting out at 45mph
in second gear at wot it is a 90 tsi fwd my question is how many rpms is it running at 45 mph please help



thanks

 

[Tommy31]

expect around 5000 give or take

If you are experiencing cut you might be getting knock. if you have a logger check your count.