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Air pump function
Hi there
Here's what I understand, The air pump injects air into the exhaust ports on cold starts for emissions, after the engine is warm it no longer injects air into the ports . The air is diverted using the two diverts into the stock cat or Fabspeed bypass that I have on my 965 or the atmosphere with after market exhaust if it's done correctly. The only thing that robs power is the belt driven air pump. Once the air pump belt is removed but all the air lines stay, What the purpose of the Stock Jectronic ECU and oxygen sensor now ?
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1986 944 turbo -first car 1997 993 Cab 6 speed-sold 1992 964 C2 turbo SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo Last edited by heliolps2; 11-03-2018 at 01:15 PM.. |
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11-02-2018, 08:02 PM
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My RoW SC just pumped air direct in to tail pipe. No diverter valve from memory. Just curious - how does it pump air in to engine on cold start? The AAR is supposed to provide xtra air for cold start?
Regards Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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11-03-2018, 01:07 AM
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Registered
Join Date: Aug 2007
Location: Austin
Posts: 581
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on a 964 turbo it pumps air into each exhaust port
and the muffler or cat or something after the turbo mines all gone so i don't remember now as to when it pumps the air on start up and/or during running ...i forgot that too |
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11-03-2018, 12:50 PM
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Crotchety Old Bastard
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That's pretty much how the air pump works on a 930/964T engine. The O2 sensor is used for Lambda control.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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11-03-2018, 01:54 PM
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The airpump control is independent of the Kjet o2 sensor and control box. Its temperature controlled and uses one or two pierburg switches. Its all in the engine compartment. Doesn't have anything to do with cold start valve.
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11-03-2018, 06:48 PM
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Blackbird
78 Porsche 911SC 3.0L, 3.3Turbo soon. 
