anybody feel like one day their truck runs like a bat out of hell and the next it seems lame? i usually have my bullydog at 50hp. im guessing its outside temp related but not sure.

I feel the same way it's probley the temp's. dave

I know temp makes a huge difference on mine. Air temp and engine temp. Truck runs best when the engine is up to temp, but no so hot that the fan cycles. Its already hot in Houston and with the A/C on and the engine fan fully engaged, there is a very noticeable performance drop.

Humidity makes a world of difference as far as how our trucks run.

thanks for the replies. it seemed to be temp related, should i bump up the bullydog on hotter days to compensate or will it not make much difference?

I feel for you. Some days it seems that the truck feels great, other days, it seems poochy. I don't know what to make of it. Same tank of gas, same weather. I don't know.

Air density which is effected by humidity has a big effect on anything that produces boost for a power adder.