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Aug 24th, 2023
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Joined: Jul 2015
Posts: 86
Just Getting Started
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OP
Just Getting Started
Joined: Jul 2015
Posts: 86 |
Could anybody tell me what speed my 2015 M3W should be travelling at in 5th gear if the rev counter reads 2000 rpm. I'm suspecting a faulty rev counter as I am apparently doing 80mph. Also the ECU appears to be limiting my revs to just under 3000 rpm. I rang my dealer last week and arranged to take it in to have the ECU setting checked, but it's pointing to a faulty rev counter.Was wondering whether anybody else has experienced this?
0000oooooooo
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Joined: Oct 2012
Posts: 6,538
Talk Morgan Sage
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Talk Morgan Sage
Joined: Oct 2012
Posts: 6,538 |
My Speedo ran 5mph over the actual speed.
I would have thought that on what is just over tick over you are v unlikely to be doing 80. More like 45/50 max.
Neil
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Joined: Jul 2013
Posts: 3,660 Likes: 48
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,660 Likes: 48 |
3,000 in 5th is just under 70 so something's not right
Red Leader 
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Joined: May 2012
Posts: 175
L - Learner Plates On
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L - Learner Plates On
Joined: May 2012
Posts: 175 |
From memory I think the ecu has a built limiter until a run in period or mileage has been completed
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Joined: Jun 2012
Posts: 2,141 Likes: 43
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
Posts: 2,141 Likes: 43 |
The speedometer and rev counter signals are both processed through the ECU. Suspect indications combined with revs being limited to 3000 rpm points to an ECU problem, I would guess.
Last edited by planenut; 02/09/15 05:31 PM.
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Joined: Dec 2008
Posts: 21,871 Likes: 168
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 21,871 Likes: 168 |
I had a faulty Rev counter on my Plus 4 which wouldn't go above 1500rpm.
It was impressive on the Motorway though!
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Dec 2009
Posts: 975 Likes: 20
Talk Morgan Regular
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Talk Morgan Regular
Joined: Dec 2009
Posts: 975 Likes: 20 |
Last weekend I noticed that speedo indicated 10 km/h too high systematcally. In my 2009 Roadster I typically use rev counter for speed, when in 5th gear. When I stopped speedo indicated 10 km/h. Switched off contact and restarted. This solved the offset.
All kind of different Mogs seem to have rev and speedo idiosyncracies.
Kind Regards,
Bert
2025 Plus Six - 1909
2009 Roadster
1983 4/4 4str
Board member Morgan Sports Car Club Holland ('21)
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Joined: Apr 2013
Posts: 1,363 Likes: 11
Has a lot to Say!
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Has a lot to Say!
Joined: Apr 2013
Posts: 1,363 Likes: 11 |
The speedo/tach are all running from/through the ECU. Digital stuff occasionally loses its mind and a simple power off/on can do wonders!
At least it's not Lucas!
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Joined: Nov 2007
Posts: 782
Talk Morgan Regular
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Talk Morgan Regular
Joined: Nov 2007
Posts: 782 |
Sounds like it's only showing half the rpm as though it's only picking up one cylinder's input... So may not be the rev-counter, may be the sender or pickup that's faulty.
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Joined: Nov 2013
Posts: 582
Talk Morgan Regular
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Talk Morgan Regular
Joined: Nov 2013
Posts: 582 |
I thought the speedo and tach were just for show anyway?
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