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22-07-13, 08:41 PM
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#1
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Member
Join Date: Sep 2012
Location: Australia
Posts: 798
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Janspeed manifolds and horrible fuel consumption !
Recently fitted some janspeed manifolds and loving the sound! Tho power has gone down very slightly :-( and since fitting fuel consumption has gone terrible!! The only thing I can think is a I've damaged one of the sensors possibly, or I've been told a few people have found that the fuel as gone down like that after fitting new engine parts for a short time while the ecu adapts. Any thoughts or anyone else who's got janspeed manifolds who have had similar?!
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22-07-13, 08:43 PM
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#2
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Site Ambassador
Join Date: Feb 2008
Location: Scottish borders
Posts: 11,539
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You're driving it faster...?
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22-07-13, 08:46 PM
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#3
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Member
Join Date: Oct 2011
Posts: 227
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Have you just got the mamifolds or complete system with sports cat? I have the whole system and mine has improved on power and consumption is no worse. You may have a lambda issue, do you have engine management light on yet? It took a couple of days before mine lit up!
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22-07-13, 08:49 PM
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#4
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technically an expertish
Join Date: Jun 2008
Location: Clydebank, Glasgow
Posts: 7,902
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Possibly lambda but yes, you can reset fuel adaptions on t4
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22-07-13, 08:55 PM
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#5
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Member
Join Date: Sep 2012
Location: Australia
Posts: 798
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Quote:
Originally Posted by Ritchy
Possibly lambda but yes, you can reset fuel adaptions on t4
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How can you do that?? I've not got a sports cat its currently got a decat too, not driving it any faster?? Might fit some new sensors see what happens. Engine light is on but thats been on since the decat, might get a mil light. Was there a guy on the forum selling those?
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22-07-13, 09:02 PM
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#6
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Site Supporter
Join Date: Aug 2008
Location: Bristol
Posts: 6,835
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Quote:
Originally Posted by redzed
might get a mil light. Was there a guy on the forum selling those?
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There was but he's a lazy fuker and doesn't do them anymore.
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James
2012 BMW 320d Sport
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22-07-13, 09:39 PM
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#7
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technically an expertish
Join Date: Jun 2008
Location: Clydebank, Glasgow
Posts: 7,902
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Downstream oxygen sensor does nothing for fueling its just a monitor, the upstreams do affect fueling a massive amount, may find the wiring is damaged to on of them, if you unplug them it should go to default fueling, if it starts driving with more power can bet one of them is down, resetting the adaptaions needs done through the T4 diagnostic computer. Check your stored codes first, anything related to bank 1 sensor one or bank 2 sensor one you can bet its related
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22-07-13, 09:53 PM
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#8
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Member
Join Date: Sep 2012
Location: Australia
Posts: 798
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Quote:
Originally Posted by Ritchy
Downstream oxygen sensor does nothing for fueling its just a monitor, the upstreams do affect fueling a massive amount, may find the wiring is damaged to on of them, if you unplug them it should go to default fueling, if it starts driving with more power can bet one of them is down, resetting the adaptaions needs done through the T4 diagnostic computer. Check your stored codes first, anything related to bank 1 sensor one or bank 2 sensor one you can bet its related
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Cheers for the info bud appreciate that :-)
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22-07-13, 10:37 PM
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#9
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Member
Join Date: Oct 2010
Location: Sunny Norfolk
Posts: 478
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Bank 1 sensor 2 - no activity?
that's my reading, isn't that the upstream post cat sensor?
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Monogram Typhoon 180 - 62k and in need of rear end repair
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23-07-13, 08:03 PM
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#10
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Member
Join Date: Feb 2012
Location: Near Newquay
Posts: 654
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Quote:
Originally Posted by redzed
Cheers for the info bud appreciate that :-)
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As said. You need to read the codes as the de-cat Mil could be masking a damaged primary O2 sensor.
In the days before closed loop mixture control fitting a free flowing exhaust system improved fuel consumption. Sadly since the Green Party own goal this isn't the case so much now. It shouldn't be worse on fuel though.
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Ex ZS180 Owner and fan.
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