Viewing a single comment thread. View all comments

Jerry_Williams69 t1_iw5d3j8 wrote

Reply to comment by Rare_Message_7204 in Catalytic converter by Zestyclose_Ad3489

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

Rare_Message_7204 t1_iw5ewsq wrote

Have you seen a prius header and downpipe? There is a resonator then a straight section with the upstream o2 ... As long as that hasn't been cut out it should have enough back pressure. It will be loud and throw an emissions code but won't run like crap.

2

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