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Top 2GNT Technical Turbo/Nitrous Tech topic #71181
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Subject: "RE: Exhaust Cutout" Previous topic | Next topic
djtrickeeNov-11-04 10:35 AM
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#79190, "RE: Exhaust Cutout"
In response to In response to 18



          

Originally posted by DarkOne
Originally posted by DSMRoadster we talked about it last month, but didn't go much into it. The problem that I and some others see with a cutout is, it'll divert the exhaust flow away from the downstream 02 sensor. The downstream is needed because it does help the upstream to make minor fuel adjustments. If the downstream aint seeing exhaust flow, it's gonna tell the ecu to dump more fuel, because of of the "phantom" lean mixture.
The downstream O2 has absolutely no say in fuel trims. It monitors the cat. That is all. However, if you take it out and leave it hanging in the air and the ECU flags it as bad, a bad o2 is a bad o2 is a bad o2, be it front or rear, so yeah, its gonna run like shit, probably open loop, dump lots of fuel, and screw up the timing curve.


So, would the resistor mod on the downstream o2 get around this? Does the resistor mimic a good cat condition or a non-existant o2 sensor? I wonder if my rear is bad since i have shit gas mileage but have recently replaced my upstream. hmmm gears turning in head now.

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Exhaust Cutout [View all] , TapRooT, May-18-04 07:29 PM
  RE: Exhaust Cutout, extreme97nt, May-19-04 07:13 AM, #1
RE: Exhaust Cutout, TapRooT, May-19-04 07:16 AM, #2
      RE: Exhaust Cutout, turbo8u, May-19-04 07:34 AM, #3
           RE: Exhaust Cutout, TapRooT, May-19-04 07:37 AM, #4
                RE: Exhaust Cutout, turbo8u, May-19-04 07:44 AM, #5
                     RE: Exhaust Cutout, GhEttOrAiD, May-19-04 09:04 AM, #6
                          RE: Exhaust Cutout, MR BLUNT 2gnt, May-19-04 12:01 PM, #7
                               RE: Exhaust Cutout, cyimsofast, May-19-04 01:32 PM, #8
                                    RE: Exhaust Cutout, swhit321, May-19-04 02:23 PM, #9
                                         RE: Exhaust Cutout, TapRooT, Jun-02-04 08:13 AM, #10
                                              RE: Exhaust Cutout, UnrealXP, Jun-13-04 12:41 PM, #11
RE: Exhaust Cutout, GhEttOrAiD, Jun-13-04 03:29 PM, #12
RE: Exhaust Cutout, DSMeclipseGS, Jun-13-04 05:42 PM, #13
      RE: Exhaust Cutout, pn0ymahal, Nov-10-04 07:18 PM, #14
           RE: Exhaust Cutout, Moderatormicyek, Nov-11-04 02:18 AM, #15
                RE: Exhaust Cutout, DSMRoadster, Nov-11-04 09:42 AM, #16
                     RE: Exhaust Cutout, Ark, Nov-11-04 09:50 AM, #17
                     RE: Exhaust Cutout, Global Ruler Of All ThingsDarkOne, Nov-11-04 10:17 AM, #18
                          RE: Exhaust Cutout, djtrickee, Nov-11-04 10:35 AM #19
                               RE: Exhaust Cutout, Ark, Nov-11-04 10:38 AM, #20
                                    RE: Exhaust Cutout, turbo8u, Nov-11-04 11:09 AM, #21
                                         RE: Exhaust Cutout, djtrickee, Nov-11-04 11:14 AM, #22
                                              RE: Exhaust Cutout, pn0ymahal, Nov-11-04 07:10 PM, #23
                                              RE: Exhaust Cutout, turbo8u, Nov-11-04 08:53 PM, #24
                                                   RE: Exhaust Cutout, silvreclipsers, Nov-12-04 03:42 AM, #25
                                                        RE: Exhaust Cutout, Teametx, Nov-12-04 05:39 AM, #26
                                                             RE: Exhaust Cutout, Moderatormicyek, Nov-15-04 03:49 AM, #27
                                                                  RE: Exhaust Cutout, 95GSEclipse, Nov-15-04 04:38 AM, #28

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