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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Apr 2012
Posts: 1,653
Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: Apr 2012
Posts: 1,653 |
Has anyone remapped their 4/4 Sigma yet?
I believe it can be sent away and done by return of post.
It just needs torque or 4th and 5th are pointless. An idea might be to remove those two gears and save weight!
I've changed exhaust and will do induction as soon as I can get the right kit.
I just can't justify the throttle bodies.
2022 Plus Four, 2023 Super Three, Range Rover Vogue SDV8 and Triking T3.
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Joined: May 2011
Posts: 1,245 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: May 2011
Posts: 1,245 Likes: 2 |
Donald - get R.P. to install a 4.11 diff. Makes a huge difference.
Best wishes,
Don.
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Joined: Aug 2013
Posts: 5,210
Charter Member
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Charter Member
Joined: Aug 2013
Posts: 5,210 |
Donald - Jeremy (WR142LL) had the first remap that Williams did on the Sigma ECU and seems to be very happy with it. Jays also did the TB on his 4/4 Sport but I think you will find he said it wasn't worth it as it made it less manageable lower down & constantly had to be revved hard. I think he thought that going for the 4.1.1 axle would have been better money spent but perhaps he can confirm.
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Joined: Jan 2013
Posts: 2,361
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jan 2013
Posts: 2,361 |
Instagram - WilliamsMotorsportuk
- Lawrie Mills(Chunkylozza)
Youtube - ChunkyLozza
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Joined: Feb 2011
Posts: 14,009
Member of the Inner Circle
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Member of the Inner Circle
Joined: Feb 2011
Posts: 14,009 |
Donald - Jeremy (WR142LL) had the first remap that Williams did on the Sigma ECU and seems to be very happy with it. Jays also did the TB on his 4/4 Sport but I think you will find he said it wasn't worth it as it made it less manageable lower down & constantly had to be revved hard. I think he thought that going for the 4.1.1 axle would have been better money spent but perhaps he can confirm. Pretty correct Roger. The best mod was the change to 4.1:1 diff....it transformed the use of 5th gear in particular and did nor funnily enough affect economy. I'd also fit a decent air filter set up like Cains, together with free flowing sports exhaust followed by a remap. The throttle bodies sounded glorious but the performance increase does not justify the cost.
Jays
Former Morgan owner. Gone but hopefully not forgotten!
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Joined: Sep 2006
Posts: 86
Just Getting Started
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Just Getting Started
Joined: Sep 2006
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Joined: Jan 2012
Posts: 14,976 Likes: 2
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jan 2012
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Revolutions Perth (dealer)
Richard
1976 4/4 4 Seater
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Joined: Jul 2011
Posts: 1,245 Likes: 30
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2011
Posts: 1,245 Likes: 30 |
Caution my 4.1:1 diff "rings" a bit, but does transform how the car drives.
4/4 Ivory 4.1:1 axle, Mercedes A200 AMG
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Joined: Dec 2013
Posts: 266
Learner Plates Off!
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Learner Plates Off!
Joined: Dec 2013
Posts: 266 |
Unfortunately my english is not well enough, so please explain: what is a 4.1:1 diff / axle?
is it a different gear box at the rear axle?
2015 4/4 "Chaplin" in black and white, usually strolling around at the german north sea shore
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Joined: Apr 2008
Posts: 12,260 Likes: 318
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 12,260 Likes: 318 |
Unfortunately my english is not well enough, so please explain: what is a 4.1:1 diff / axle?
is it a different gear box at the rear axle?
Hi Ralf, it just refers to the reduction ratio of the differential gear in the rear axle - for every 4.1 turns of the propellor shaft, the rear axle shafts make a single turn. Morgan fitted several different rear axles with different ratios, and this is the lowest of all of them. It means the cars are relatively low-geared, giving a very sporty feel. The higher ratios give a more relaxed cruise. For a 4/4, I think the 4.1 : 1 ratio is by far the best...
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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