Air Pump Removal: Hole Plugs
05-17-2009, 12:53 PM
#16
Rennlist Member
Modern cats don't require an air feed and the OEMs tend to plug up and overheat.
If you replace the OEM cats with an 'X' pipe and cats you save weight, add HP and a more efficient system.
By removing the air pump and all associated plumbing you save more weight thus adding a little more HP........win win.
If you replace the OEM cats with an 'X' pipe and cats you save weight, add HP and a more efficient system.
By removing the air pump and all associated plumbing you save more weight thus adding a little more HP........win win.
05-18-2009, 12:10 AM
#17
Rennlist Member
My air pump was disconnected by the previous owner by removing the belt.
Appart from the anti-pollution effect that is hard to measure, the most noticeable effect of the removal was the center console getting hot from excessive heat generated by the cats down under. It was sufficiently hot so that the A/C cold air was barely keeping the cockpit comfortable during hot days. The other problem was the "CAT TEMP TOO HIGH" warning going off from time to time (originating from Japan, my car has 2 temperature probes in the CATs).
I decided to rebuild the the air pump and reconnected it. The CATs temperature is now more normal. The center console heat is no longer a problem. I also noticed that some water/humidity (car washing)was flowing through the pump air intake and rust had built up in the pump. Fortunatly, the pump bearings were untouched and I managed to clean the thing up. So if you plan to leave yourself the option to reconnect the pump, make sure the tubings are properly sealed.
Also I'm not sure if the CATs can be damaged from running warmer than normal. I think it is something to consider before removing the air pump system.
This is an opinion based on my observations. I may be technically wrong...
Michel.
89 928 S4 ROW
Appart from the anti-pollution effect that is hard to measure, the most noticeable effect of the removal was the center console getting hot from excessive heat generated by the cats down under. It was sufficiently hot so that the A/C cold air was barely keeping the cockpit comfortable during hot days. The other problem was the "CAT TEMP TOO HIGH" warning going off from time to time (originating from Japan, my car has 2 temperature probes in the CATs).
I decided to rebuild the the air pump and reconnected it. The CATs temperature is now more normal. The center console heat is no longer a problem. I also noticed that some water/humidity (car washing)was flowing through the pump air intake and rust had built up in the pump. Fortunatly, the pump bearings were untouched and I managed to clean the thing up. So if you plan to leave yourself the option to reconnect the pump, make sure the tubings are properly sealed.
Also I'm not sure if the CATs can be damaged from running warmer than normal. I think it is something to consider before removing the air pump system.
This is an opinion based on my observations. I may be technically wrong...
Michel.
89 928 S4 ROW
