G
Guest
·I've been told by a few people that if you pull the cats off the car and put in the Downpipe then your boost will increase.
Now I was wondering how this is possible since boost is actually a measure of backpressure in the engine. Plus, the wastegate should always limit the boost to 11.5 psi. If all things being held constant, ie. the cfm from the turbos, then boost levels should actually decrease from removing the cats since there is less backpressure in the engine. Since the supra turbos are capable of handling increased cfm, the boost levels return to 11.5psi where it is capped by the stock wastegate. So, what is really happening when the cats are removed is, you are decreasing backpressure in the engine and increasing cfm from the turbos with the boost levels still being regulated at 11.5 psi by the stock wastegate settings. More flow at the same boost levels.
Now I was wondering how this is possible since boost is actually a measure of backpressure in the engine. Plus, the wastegate should always limit the boost to 11.5 psi. If all things being held constant, ie. the cfm from the turbos, then boost levels should actually decrease from removing the cats since there is less backpressure in the engine. Since the supra turbos are capable of handling increased cfm, the boost levels return to 11.5psi where it is capped by the stock wastegate. So, what is really happening when the cats are removed is, you are decreasing backpressure in the engine and increasing cfm from the turbos with the boost levels still being regulated at 11.5 psi by the stock wastegate settings. More flow at the same boost levels.