Quote:
quote:Originally posted by 2step
Dalite........It looks as though we're talking about stock/factory control here. Your position seems to be, the computer control is programed to take only what it needs or as much as it needs to produce a set amount of power. I hope my pea brain is following you correctly.
Will taking away some of the stock controls, such as after market, adjustable wastegates and boost control create opportunities for these cool air/more air mods to produce improvements? Lots of paradigms here, I guess.[:I]
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Sorry for the late reply; I don't get on her much anymore....
Think of it this way. The PCM (computer) has a certain amount of processing power and a speed of processing. It is looking for data within a set range, to determine what kind of control it has over the engine.
When you add aftermarket items, they sometimes make the data the computer receives from it's sensors fall outside of the range that the computer is programmed to accept as normal.
When this happens, there is a big chance that the computer will derate the engine performance until the data falls back into range.
You can research Mass Air Flow vs Speed and Density turbo management to get a loose concept of what has been accepted as the 2 methods of turbo management.
The GT uses a variation of the Speed and Density concept, but it is labeled as Torque Based Turbo Management.
When I mentioned the computer having a certain amount of processing power and speed, I was leading up to a comparison.
If you have a lot of junk running in the background of your PC, you can bring up the task manager and see the actual amount of processing power that they are using as a percentage by hitting ctrl-alt delete one time. If you close some of the background processes that aren't needed, you will see that it frees up both memory and processing power to allow the programs you want to run react faster.
The PCM is the same way. If it is constantly having to doubt data it receives and derate performance until it receives data within it's acceptable range, performance suffers.
By the same token, every timer-tick that the PCM has to spend trying to manage a system that has been foiled by an after-market change, is a timer-tick that could have been used to make the stock configuration perform closer to maximum.
I just got a data logger for my GT, and I will try to get some data collected to indicate throttle position, engine load, speed, RPM and Intake manifold pressure. I can select parameters (Plus actual speed) to log, for up to 300 hours at a time - before downloading to the ocmputer and graphiong the results.
Hopefully, this will provide some concrete results that will provide more information than conjecture.
I have gathered all the info on the system that I could find, but so far, DCX has been playing their cards close to their vest concerning the PCM operation on the GT.
I hope this made some sense.....