I believe that I have read people who install a full exhaust system and significantly reduce backpressure notice a drop in the boost numbers on their boost guage. If this is indeed the case, what is the cause of the loss of measured boost? The reason I am asking is that I have a much more technical question assuming this is an accurate statement...

ken

 

and significantly reduce backpressure notice a drop in the boost numbers

you are answering your own question

 

I realize that, thanks...

I'll just throw the question/observation out there...

compressing air causes heat.... As boost pressures go up, momre heat is generated. If a full flow exhaust system reduces back pressure enough to reduce boost pressure by a couple of PSI, is it possible that the additional HP from the headers is more that the boost being built, now seeing less backpressure, is less heated and therefore more efficient? The KB is all about more boost with less temps. So, theortically, is it possible that instead of say 5HP from another 2lbs of boost (once you are getting up there in boost numbers), you maybe net 10 or more because of less heating/increased efficiency?

Second would be that of detonation. If the back pressure is less, doesn't it mean less heat and therefore potentially less detonation? Could one assume that, in the example above, where 2lbs less is seen that the boost could be upped slightly and see even more gain without additional heat? (over where it would have been without the full exhaust)

Thanks

Ken

 

i tell everyone that puts lt's on their truck that they should check their a/f ratio

that is what is going to cause your detonation

 

And or to much timing.

 

Think of it this way: Boost pressure is just compressed air trapped by restrictions in the engine/exhaust. Make it easier for the engine to exhaust and the boost pressure will be less. That doesn't mean your HP will be less, it will be higher.

 

Ken, it's just a matter of volume in the cylinder. If you extract the waste gasses from the cylinder more effectively, you have more room for the incoming mixture.

If you have more room in each cylinder, then you will get more of the incoming mixture to the cylinder. This reduces the backpressure in the intake (boost).

The bottom line is, the more mixture in the cylinders, the more POWER.