Im workin on a turbo setup. The manifolds I am making will not have AIR tubes in them. Is it OK to have the smog pump go directly to the cat and just remove the diverter valve?

 

I dont know, but I want pics =D

 

Do you have emissions testing where you live. If not there is no point to having the system on, taking it off will save weight and alittle more power, but you might lose 1 or 2 mpg (possibly) alot of people say there are not any ill effects. I know that if you remove the diverter valve along with the solenoids in it. All those air tubes do is re-insert fresh air, to the exhaust to help with emissions. If removed the ECM will notice there is less fresh air and might cause it to lean out alittle bit, (there is a complete article on this search it, it is very helpful). But the supposed "lean change" is very very minimal. I havent heard from anyone having ill effects (including me). If anything it should help. The compressor and other things weigh a good bit and it will put less drag on motor. If you check out the tech article on that in this site it will tell you how to re-route the belt and even the part number for the new sized belt.

 

I want to keep the smog pump I just have no way of getting air into the manifolds I would still pump it into the CAT direct from the AIR pump. We have sniffer testing but no visual inspection. Im not to much into tuning but Im pretty sure that it can be tuned to run without the AIR injection to the manifolds.

 

Actually you should have the down stream pipe(s) going to your cat already. If you have dual cats, there should be a Y splitting for the cats. The manifold air is just for cold start. You could bypass it to the atmosphere and it will just make noise until going into closed loop. Once in closed loop, the air is sent to the cat(s).

 

Air is injected into the manifolds only during open loop mode to help reduce cold start emissions and shorten O2 sensor warmup time.

Air is injected into the converter only during closed loop mode, otherwise the ECM diverts the air to the atmosphere under the following conditions:

1. Rich operation
2. When the ECM recognizes a problem and sets the "Service Engine Soon Light.
3. During deceleration
4. During high rpm operation when air pressure is greater than the setting for the internal relief valve.

If none of these conditions present a problem to you, then all you need is the pump with a direct line to the converter.

 

Well as long as you only have "sniffer" testing then I seen no reason to keep the pump. It doesnt aid in reducing emissions to any reasonable extent. If your car is in good tune you wont need it to pass emissions. I know a good tuned TPI will pass emissions without a cat, or AIR system. I know because I did