[wookwook]

hmm. the OP, The tape seems unusual to me. I just don't really see how the 38 difference got there. The free breathing stuff is precursor to the tune but not the constricting part for a oem tune. I did a whole chart on here with the deltas myself.

The modern GM stuff. The way to conceptualize it is all Torque based. It may be a bit of a mind bender, but thinkin on this for a while. Suppose you mash the gas and Scotty in the engine room says I'm giving all she's got captain. Scotty is really saying that the entire drive line is trying to produce the desired, programmed output. In simplified terms, the transmission is the driver and the engine is the horse.

I did all the incremental increases in here somewhere from a couple years ago. There is no way a DP and CAI will produce that kind of increase on its own, without adjusting the Driver commanded torque, end of story.

Charlie the horse is a member of the Horse Carriage Haulers union # 119 and with his current contract will only pull 5 kegs of beer 15 miles at 10 miles per hour. Presumably in rain, snow, mud, heat.

Now you put tennis shoes on Charlie, and he's decided to pull 5 kegs of beer 15 miles at 12 mph. The moral to the story is he cant and wont. because he has to stop and take a dump no matter what. And if he gets there early he will have to pay a fine. And no beer. Because those union leaders (EPA) are real bastards when it comes to work made and how much hay they have to feed him. And how big his turds are.

The ECU is designed to control torque vis fuel consumption, manage fuel burn and hence emissions. That is almost all there is to it. They make it really hard to push the upper limits. Unless someone increased the demanded torque tables, (re-written the union contract) there is no way you can jump almost 40 HP with some piping and filters. I'm sorry it just doesn't make sense. Or your tuner dyno guy didn't do the SAE corrections on the second pull.

Or the first and second pull no SAE corrections. That would make sense if the first day was hazy and hot then a cold front went through and now its cool and dry. SAE correction adjusts that out to a SAE day, or STD day. There's a 3rd one in there too. But the same applies. That is the only thing to explain the high delta records. Without an increase to demanded torque. Which happens though computations based on a human readable table of values.

This engine is highly sensitive to atmosphere conditions, more than most cars. That's why you might hot lap hot track nights, then everyone converges on the perfect DA nights and you only get 2 passes.

A turbo blanket is a good idea to keep the heat from building in the engine bay.