I havnt commented on my Morgan Stage 2 upgrade to date , mainly because I felt there was a fault above 5K revs such that there was a severe power loss at these high revs. Morgan repeatedly offered to help find a solution , but lifes to short ... and we are now at the end of the season.
Not wanting this to drift into next year I have paid for specialist tuning and a dyno test myself , conducted by Matts Machine Shop , result below.
The upshot is there is no fault. As shown by the audit trail the ECU provides, I seem to be repeatedly exceeding the soft rev limit , which cuts out one cylinder when exceeded. Interestingly there is also a hard cut off, set to a higher value , that ( I believe ) cuts both cylinders ... not had that yet thank goodness.
So down at Matts we fitted the std S&S roller rocker kit ( a no brainer of a mod - improved valve travel , more substantial rockers and I am experiencing a smoother engine as a result. ) , then did the dyno runs.
The main upshot of the dyno run was to prove there were no underlying faults , and to point the way forward for further improvements.
The tuning experts reported 'no faults' , and the guys who knew what they were doing were pleased with the relatively flat output over the rev range.
The dyno itself was capable of measuring BHP through the drivetrain, so it could give results at the engine flywheel and at the rear wheel. This let Matt ( who is a very experienced S&S tuner ) give comment on his area of expertise - the motor itself. Even with the Morgan stage 2 exhausts he believes more free flowing exhausts , ideally without the cats ( not a viable proposition to keep it road legal !! ) would be a simple and useful direction to take it for more power.
The 148 BHP at the flywheel / 110 at the wheel is about what they expected , the difference being losses in the drive train , which is the norm of about 20%. The useful rev range of 3 to 5K containing the highest power at the wheel is good to know.
I dont profess to be a tuning expert , but the way forward for me for more power is to reduce drive train friction and investigate alternative exhausts.
I am very happy with where these various mods have taken me , the car is not showing signs of destroying itself , though I have had of course faults other people have already had. It continues to be a pleasure to drive , and I look forward to further performance mods in future. The run back from Matts through South , Mid to North Wales and into Cheshire was totally brilliant
I highly recommend anyone interested in doing similar to speak to Matt , who is steeped in performance tuning , aimed at S&S technologies , and completely approachable , friendly and genuine sound chap.
