Originally Posted by CHF
How do you notice a shaking flywheel, if you don't mind me asking
Less or more trembling of the "drive chain (???)" when using max torque (generally somewhere between 1900 and 2400 rpm).
Originally Posted by cj romeo
The boost on this map is probably lower than the 180's you guys are running, its less than 1.6 bar.
If youre getting a remap - by all means ask as many questions of the tuner as you can, as many just download generic maps, and if your lucky, tweak the odd setting.
The EDC16 continually spews variables and remaps itself within its own parameters, the remap sits within this, external bolt on things are basically sensor simulators and can be problematic.
Please keep in mind the following:
The standard software contains a "turbo pressure limiter" parameter. The standard value is 2.4 bar, if I remind correctly. When this limit is reached, the software will issue a turbo pressure error and a "emergency program mode" will be invoked.
It is very easy for a tuner to set this "turbo pressure limiter" parameter to a higher value. If that's done, the above mentioned error will not occur untill the new value will be reached.
If this is what you mean with "The boost on this map is probably lower than the 180's you guys are running, its less than 1.6 bar." (which I hope you don't!) then a turbo pressure of up to 4.0 bar is possible without getting an error message and invoking of the "emergency program". However, not getting that error anymore doesn't mean that everything is OK in this situation.
The GT JTD does not have a waste gate to blow off air in case of high pressure. Instead of that the overboost is controled by some kind of valves that open more or less.
When these valves are completely opened but turbo pressure is still increasing, the value of the "turbo pressure limiter" will be reached and the "emergency program" will be invoked. Which for sure is an important safety mechanism !!!
When the "turbo pressure limiter" is set to a higher value, the limit will not be reached although the valves are completely opened and turbo pressure is still increasing. Valves opened to the max + Pressure still increasing = BAD situation. In that situation the turbo pressure in fact is completely uncontrolable!!!
When you're driving in such a situation/such a car, you'll probably be very satisfied with the power you're experiencing. But technically, it is a very bad situation with regard to the reliability, durability, etc. of the car.
A good chiptuner keeps this kind of things in mind and shall respect this kind of safety controls. And that's way "the best tuner" shall never be able to claim the best power figures.