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I had my car dynoed yesterday and unfortunately lost 28RWHP. The shop suggested that my belt was slipping by the shape of the curve. I confirmed this by driving on some empty roads. The car is only making 8lbs when it used to make 10lbs. I changed belt in the morning prior to the dyno pulls. The tune has not been changed and the only thing I can think of is the belt tensioner. Anybody got suggestions?
New belts tend to stretch a little just after install, I'd definitely check it.
The belt just barely went on over pulley when I installed it. Upon reading my install guide/ owner's manual it recomends replacing the stock tensioner if there is > 50K miles. The car has around 65K now, 40K with the blower on. I'll try to scan in the dyno sheets later today to get more input. I guess that I could always go to cog set up.....