Jerry_Williams69

Jerry_Williams69 t1_iw5g3zq wrote

Yeah no. Have you seen the EGR system on Prius engine? When the O2 sensor(s) doesn't see what it should, it is going to try to send a lot of exhaust gas back to the intake. That won't happen without back pressure. Air fuel ratio will be off. Will cause sluggish performance and reduced fuel economy. Will also see increased combustion temps that can cause the engine to overheat.

−2

Jerry_Williams69 t1_iw5d3j8 wrote

Yeah no, but I agree with your second paragraph. The engine will run like crap without the cat. I never said it would hurt the engine. Can you make an engine run well without major components? Yep. Going back to the OP, it sounds like the question is what would happen with a straight pipe and no other changes.

−1

Jerry_Williams69 t1_iw4e0qd wrote

Cool story bro. I've designed engines for CAT and Cummins. I know a thing or two about emissions systems and engine back pressure. You just don't realize that your "tuned"/deleted engines aren't running the best they could. You also aren't giving enough credit to the Prius's power train. It is pretty advanced for a mass produced auto product.

1

Jerry_Williams69 t1_iw45uzj wrote

Of course you can over-restrict the exhaust. Engines are designed to operate in a back pressure range. Too high or too low, and they don't work right. Especially if the engine has an EGR system. You are flat out wrong about not noticing a difference.

−2

Jerry_Williams69 t1_iw3x2oo wrote

Your car is going to run like total crap. The exhaust back pressure will be too low and the O2 sensor(s) will over compensate. Probably will recirculate too much through the EGR valve. Will get terrible fuel economy and the engine will be very weak. Not sure that it would damage the power train, but you will notice a difference.

−6