Originally Posted By PaulJ
Originally Posted By paddockman
Thanks Paul - that was my thoughts, can I ask what silencer you went for? Was it a standard Morgan?


Because I have been playing with Caterhams for the last 30 or so years, I had a spare 6" round Caterham straight through silencer with, by chance, exactly the correct sized pipes at either end. It originally came off a 2l. Vauxhall 16v engined HPC Seven. I had the tail pipe, which had a bend in it for side exit fitting, straightened and lengthened slightly and it was a perfect fit, with a nice burble instead of the aggresive bark that the standard shorter oval silencer had.

Peters experience is most interesting and it will be interesting to see what the cat. fitted to my own Cosworth Duratec, manages to do when it comes up for its' first MoT in the spring. Maybe the mapping is better than Omex, although, interestingly, they blamed the exhaust system that Morgan later fitted after the mapping was done, on the SS + 4's?

Omex did the original map, or one should really say calibration (because there are two maps, fuel and ignition, and a whole lot of other settings) based on the Plus 4 SS prototype. This car was eventually purchased by Richard Wragg the MD of Omex. Between the development of the prototype and the final configuration of the car as delivered to clients something changed. The only component the Omex supplied was the programmed ECU. I do not know the details of what was different however I do know that the problems surfaced at about the same time that I was having trouble with my car that was fitted with the same exhaust system.

I should mention that, at Morgan's request, the calibration was password locked. One can understand this but it did stop individual owners and tuning workshops from working on the calibration.

Unfortunately there was a period in which Morgan and Omex did not see eye to eye on resolving the problem. Eventually Williams arranged for Omex to hava a customer's car for sufficient time to come up with two solutions. One would have involved completely new firmware and calibration that would have required the ECU to be sent back to Omex. The other involved a new calibration that could be loaded by the dealer. In the end this was the solution chosen and I understand that the relationship between Morgan and Omex was then improved with Morgan distributing the new calibration and instructions to dealers.

Plus 4 SS owners owe a vote of thanks to both Williams and Omex for eventually resolving the issue. I understand, from a couple of Plus 4 SS owners that I have had contact with that they are now very happy with their cars.

If anyone is curious as to what is involved in calibrating an Omex ECU you can download a pdf manual here.

This and a lot of other info can be found on http://omextechnology.co.uk

PS. I have no connection with the company. I'm just a happy owner.

Peter

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