Are all of tuning boxes based no dumping more fuel pressure into cylinders?
Fancy tuning box manufacturers swear that they have nothing to do with fuel pressure, but instead offer more refined engine management, real time tuning for each partucular engine. I just bought Brabus D6 kit, should be here in a day, or two, however after reading warning posts from more cautions members here, I am not sure if I want to install it if all it does is rasing fuel pressure and overheating exhaust, by doing so.
BTW, can someone recommend good exhaust temp sensor kit?
My understanding of tuning boxes is that they take input from one or more sensors, modify that input, and then send the modified output to the ECU in the vehicle. The tuning boxes are preferred by most because they are completely stealth to the dealer because they can simply be removed when you take it in for service.
The alternate, usually more expensive, and better way (my opinion) is to chiptune the vehicle. In this case the ECU is reprogrammed or modified and the programmer has more control over everything. In some cases, the dealer can detect these modifications and may void warranty and/or possibly reflash it when it is in for service.
In the case of the tuning boxes, they can only modify or control what is plugged into them.....is they may be talking about in advertent changes based on how they are fooling the ECU. It's hard to say and many of them don't go into any detail as to how they modify these signals or change the performance of the vehicle....that makes me even more skeptical of them.
The cheapest way in the diesel powered vehicle is to simply add fuel....more fuel more power. The good thing about some of the ECU tunes or performance tuners is that they can actually monitor things like slippage of the transmission and defuel the engine to compensate. The same would apply for EGT and some of them even come with probes in other applications. These are modules like the Edge Evolution tuner for the fords. They are pretty stealth too and I guess they are kind of a 3rd type of performance programmer. They plug into the OBD-II port and program it that way.
I tend to be partial against performance chipping of any kind. Mainly due to all the bad things I have seen happen when people use them. Wierd things develop like surgest as certain loads or RPM, they throw CEL right and left, expensive parts like Turbos, clutches, or other drivetrain parts fail prematurely. Some of it of course could be from the fact that people are driving the cars harder because of the new power, but I tend to trust the engineers who put much more time and energy into designing the vehicle but again they are designing it to be relaible and efficient and not squeezing every last bit of HP or torque out of it....but again....from my expereince with doing it on a Volvo and friends/family who have done it....I choose to steer away from it.