New
by Rex_tulips - 30/07/25 07:59 PM
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Aug 24th, 2023
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My S1 now has its new exhaust, twin pipe side exit. So it is larger bore than the original & a shorter length run. The issue is when warm, & coming onto idle, say when slowing down for lights, the idle speed hunts a little. Has anyone else found this or has any suggestions please?
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Joined: Sep 2010
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Talk Morgan Expert
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Talk Morgan Expert
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Bet it sounds awesome! Sorry can't help but are you sure it's the exhaust and not just a coincidence ? Like the MAF Sensor?
1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8
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I have to say it sound epic, like a C63 AMG Mercedes, but subdued on the motorway.
It could be the lambda or the MAF I guess, just wondered if anyone else had a similar issue when carrying out a significant exhaust mod. I guess it'll become a process of elimination.
Does anyone know the manufacturer & correct part numbers for these 2 items (2001 4.4 S1). I'll give the ECU some miles to see if it relearns, but I suspect I'll have to start replacement these instruments one at a time. I wondered if it was something that might benefit from resetting the ECU, if I can find how to do that on a BMW forum.
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come on Ian, we need to see some pictures of the new set up - preferably with a sound clip too  James
Aero8 , Series 1 - Boston Green
Mercedes EQC 400 AMG
Smart Brabus Convertible
Honda Monkey Z125
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I have tried to load pics without success. I tried following the idiots's guide but failed - not sure if a failure means I'm an idiot or not....
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No, can't see the pics.....
Series 1 Aero 8
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Looks a very neat job. Just something to keep an eye on. On my plus 8 the pipe outlets move rearwards approximately 15mm when hot. Hence when cold, the outlets are not in the centre of the aperture.
Last edited by deano; 05/05/17 06:34 AM.
Martin (Deano)
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Hi Ian,
I never had any issues when I "converted" to side exhausts, but before I certainly did and it was certainly the MAF sensor. In the end it did keep cutting out. It may be that they might be a bit dirty - might be a cheaper fix!
By the way, if you pass slowly past "new style" parked minis I have noticed on a number of occasions the exhaust rumble sets off their alarms!;)
15 Weissman GT5
11 Aero8 SS
21 Q7
23 RR
24 Def'r 130
1960 XK150 DHC
1970 E-type
2024 Huracan Tech
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Hi Taffy
Thanks for the thoughts on the MAF, have you got a part number or is it standard BMW 645?
If it's a BMW part, I might need to drive slowly past their affiliate Mini forecourt on the way out :-)
Deano
15mm linear expansion sounds incredible to me on an exhaust system!!
Last edited by Volvos60s60; 05/05/17 07:17 AM.
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