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Joined: Jul 2013
Posts: 3,658 Likes: 48
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,658 Likes: 48 |
Its going to them for a couple upgrades so will ask the questions as to if its had the stage 1 kit. MMC stage 1 has square cut exhasut tips whereas the stock are angled. If you're getting the "gravel" sound (probably starting at about 5,200 rpm) that's pinking and stock exhaust. As discussed in may threads - drill out the front baffle or swap to MMC Stage 1 or G56 to free up the engine.
Red Leader
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Joined: Aug 2011
Posts: 398 Likes: 1
Learner Plates Off!
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Learner Plates Off!
Joined: Aug 2011
Posts: 398 Likes: 1 |
For the early models there was a software change to retard ignition at high revs, high load conditions.
I have the SandS stealth muscle air filter fitted and found it helped to smooth out the motor a tad.
I got hold of the updated software from my dealer and uploaded to the ecu myself using the Protune program.
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Joined: Feb 2016
Posts: 7,920 Likes: 216
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,920 Likes: 216 |
I understand the X-wedge engine has an anti-knock sensor which automatically retards ignition to stop possible pinking (S & S documentation confirms there is one fitted to rear cylinder).
If the issue occurs around an indicated 5200rpm and given inaccuracy of tacho, it could well be the rev limiter cutting in which I can best describe as a misfire sound with associated power hesitancy. Little point in holding onto revs above 5000rpm anyway. Just viewing power/torque curves will confirm that both are tailing off then.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
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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 |
Running the Stealth Muscle cover and it does help with engine reaction time. This engine, with its torque and short rpm range reminds me of a diesel engine which is a massive air pump. You can hear the noise of the air intake. I also understand that the original hockey puck of a cover was modeled to help damp out engine noise to conform to various countries noise laws. It does not help performance.
As Richard Wood stated there is not much point going above 5200rpm. Even there the engine is ragged. I keep mine between 3000 and 4700 rpm. I find the tach to be very accurate compared to the fuel gauge.
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Joined: Sep 2016
Posts: 99
Just Getting Started
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Just Getting Started
Joined: Sep 2016
Posts: 99 |
Change the pipes to Magnaflow's like I did or a Stage 1 and throw the exhaust pipe wraps away! I also added a little "Spitfire" air scoop to help drive the clean cool air into the engine. The engine gets plenty of clean air now. [img:center]  [/img] High Noon Speed Shop .....cruising the back roads to Nowhereville....
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Joined: Sep 2016
Posts: 99
Just Getting Started
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Just Getting Started
Joined: Sep 2016
Posts: 99 |
Again I really feel the factory air filter is really not a problem at all especially when you add an air scoop. Here is my Magnaflow Muffler conversion link. I did this all myself for a little under $300!! Magnaflow Muffler conversion..... High Noon Speed Shop
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Joined: Jul 2013
Posts: 3,658 Likes: 48
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,658 Likes: 48 |
I understand the X-wedge engine has an anti-knock sensor which automatically retards ignition to stop possible pinking (S & S documentation confirms there is one fitted to rear cylinder).
If the issue occurs around an indicated 5200rpm and given inaccuracy of tacho, it could well be the rev limiter cutting in which I can best describe as a misfire sound with associated power hesitancy. Little point in holding onto revs above 5000rpm anyway. Just viewing power/torque curves will confirm that both are tailing off then. With the stock exhaust the pinking is due to the restricted airflow exiting the cylinders, not the timing. Hence why the headers glow red after a few minutes and using higher octane fuel or an octane improver makes no difference.
Red Leader
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Joined: Jan 2014
Posts: 104
L - Learner Plates On
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L - Learner Plates On
Joined: Jan 2014
Posts: 104 |
Little point in holding onto revs above 5000rpm anyway. Just viewing power/torque curves will confirm that both are tailing off then. Although I agree the last RPM aren't going to gain you much, the torque/power curves on their own don't tell the full story - it's a combination of gear ratio and torque at the relevant rpm. i.e. if you're really going for it (e.g. circuit racing) you are usually better off holding on to the current gear even if power is dropping off.
2012 G56 Stage 2 M3W 2007 Fiat Panda 100HP 1998 Lotus Elise (Cosworth Duratec) 1988 RF88 Van Diemen
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