Attention: TDR Forum Junkies Certainly in my case, the pressure box reduces EGTs. But don't get the wrong idea here -- there is no free lunch. pls read the section on stacking in the fueling box summary , where I point out:
* Stacking to add power may be counter-productive, as the fuel rail itself will probably run out of capacity. In fact, stacking to achieve additional power is usually a bad idea, at least without upgrading the fuel system. Adding fuel via electronics doesn’t mean that the mechanical system is capable of delivering it.
* Any time you add fuel (regardless of the method, i. e. pressure or duration) and then use the additional power, there will be an EGT consequence that the stock truck will not be able to handle, even with intake and exhaust modifications. For example, stacking the least powerful duration box (VA) with the least powerful pressure box (VA) will likely require a turbocharger upgrade.
* The only two stacks I am aware of that achieve a useful goal (utilizing the stock fuel system), have nothing to do with additional power – they have to do with attaining the desired fueling curve and/or a reduction in EGTs. Both the TST and the VA duration boxes have been stacked with simple pressure boxes with good results in this regard. Note, however, that the opportunity here is to achieve a reduction in EGTs by using more pressure and less duration to achieve similar power levels. This means turning the duration box down when adding a pressure box. For example, the VA duration box on its lowest setting, combined with a pressure box on a ~50 HP setting, will achieve about the same power level as the VA by itself, but will do so at lower EGTs.
* Stacking to add power may be counter-productive, as the fuel rail itself will probably run out of capacity. In fact, stacking to achieve additional power is usually a bad idea, at least without upgrading the fuel system. Adding fuel via electronics doesn’t mean that the mechanical system is capable of delivering it.
* Any time you add fuel (regardless of the method, i. e. pressure or duration) and then use the additional power, there will be an EGT consequence that the stock truck will not be able to handle, even with intake and exhaust modifications. For example, stacking the least powerful duration box (VA) with the least powerful pressure box (VA) will likely require a turbocharger upgrade.
* The only two stacks I am aware of that achieve a useful goal (utilizing the stock fuel system), have nothing to do with additional power – they have to do with attaining the desired fueling curve and/or a reduction in EGTs. Both the TST and the VA duration boxes have been stacked with simple pressure boxes with good results in this regard. Note, however, that the opportunity here is to achieve a reduction in EGTs by using more pressure and less duration to achieve similar power levels. This means turning the duration box down when adding a pressure box. For example, the VA duration box on its lowest setting, combined with a pressure box on a ~50 HP setting, will achieve about the same power level as the VA by itself, but will do so at lower EGTs.
