It's driven all the time, whether in bypass or diversion mode.NoSlow5oh said:It takes about 1hp to drive it, when it is in use, which is only the first minute or two of each drive cycle, when its cold.
You must have misunderstood what I meant. The smog pump's only operation is to pump air into the exhaust through the h-pipe to help with emissions during a cold start up. It is only in use when the engine is cold because the computer uses a program file like that of a carburetor with a choke to keep the engine going, and all that extra fuel does not get burnt in the combustion process. It only lasts for a minute or two. During that point of operation, it only takes around 1hp to drive the pump. When the motor has warmed up enough, the pump is pretty much a free spinning pulley. There have been mustangs dynoed just to prove this.FoxChassis said:It's driven all the time, whether in bypass or diversion mode.
You're thinking of air diversion to the cylinder heads during 'cold start-up' and 'cold drive-away'.
During air diversion to the converter(s), the pump is still being driven. During air bypass to the atmosphere (@ WOT), the pump is still being driven.
I think you hit the nail on the head. I tried to keep my posts mild. I am going to read up on the smog equipment a little more. The only thing I was wrong about is the smog pump cutting off. I will admit that. Everything else I was correct on. So, if someone wants info about the smog stuff, I'll send them to Foxy.059185allmine said:Looks like someone is a little bit childish. Don't understand why everyone is correcting everyone and arguing with eachother about every little thing. Not everyone knows everything. That is what I thought the forum was for. To help each other not to belittle each other and argue. Everyone is entitled to their opinion and some may not know everything like others may think they do. Let just stick to helping each other.