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Jun 14th, 2026
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
Whatever the physics of this are, the two biggest improvements to the rear end of my Roadster, are Rog's Spring Assisters, and the Panhard Rod.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Nov 2018
Posts: 6,667 Likes: 433
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,667 Likes: 433 |
Here's mine. Designed by Peter B, made by me. Progressive bump stops are needed as I'm still on Armstrongs (albeit with adjustable valves) ![[Linked Image]](https://tm-img.com/images/2020/05/09/zijj-A_UQxdwpGJWtzt8F2f_OTYnI7glo96zRcteG7Mju2ScUBBsjv4H_nZHdhrKlcqraRplDWjoaSZi4FFz1Relbasdi-s7Kh0Fxa_9P5c-SbBjG5eWbIWzyxqrd5DUwP5d1PYiVEDXk5H2LsZRGkpLdZs_DHMDWnk8prwYOZowxQlShjbdUrGq2daxQgQaN3RLRf7x.jpg)
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Joined: May 2012
Posts: 1,703 Likes: 35
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2012
Posts: 1,703 Likes: 35 |
That's a proper bump stop  I bet there's a few 4 seater owners that would like a pair of those 
Roger
2011 Plus 4
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Apr 2008
Posts: 12,256 Likes: 317
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 12,256 Likes: 317 |
Nice job Phil, very impressive.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Joined: Feb 2016
Posts: 8,657 Likes: 407
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,657 Likes: 407 |
I don't suppose anyone has had a go at fitting Rogers bump stops to an ARP4, with coilovers instead of leaf springs, have they? When loaded my springs do bottom out, with quite a bang too. The alternative is harder rear springs, but that will harshen the ride too or get some longer springs and wind up the clearance a bit. Have you spoken to Dan at SSL Paul? His company offer dual rate coil overs with adjustable pre-load and damping for the factory 5 link Roadster, basically the same as previously used on the ARP4 I understand. My experience with them nearly three years in is despite being softer over rough surfaces they also cope well with severe undulations two up, full tank and with humungous suitcase on the back. Almost surprised mine don't bottom out sometimes but the gentle way they stiffen up as full bump is approached must put them at a higher spring rate than factory single rate coil overs, which has extra dividends in improved roll control. All I add is a few extra psi in the rear tyres and a couple of clicks on the damping for such touring. Even then I have the option of increasing spring pre-load but never found this necessary. ETA: Apologies Paul but just noticed your query was from over a year ago when CooperMan gave similar advice. Intrigued to know if you followed it up as may be of use to other ARP4 owners?
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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