Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 An idiots guide to M3W ECU's

Not seen any nylon washers on the ECU mounting before. They do look like the instrument washers that fall out easily.......

OK, thanks Planenut. Are there two per instrument? I can see where they would act as spacers for the mounting plate that has two hole since it does not appear that they have a large O ring like shown in the parts book. The reason I am puzzled is that there would be 4 washers, two for each instrument and I could only find two.

UPDATE: Two on each appear to work perfectly. Getting the little buggars in there is definitely skill testing , and lord knows where they go when you hear the ominous sound of it falling but not showing itself. I suspect the first speed bump I encounter is going to leave a pile of washers somewhere.

I was wondering about vibration to the unit.

Gentlemen:

I have ordered a Stage One performance exhaust from an American Morgan dealer. They indicate to me that I need to send them my ECU in order for them to send it to Morgan Motors in Malvern to have it "flashed".
I note from the posts by Black Adder et al. that my present ECU, which I assume is locked, will work with the Stage One kit. As I am hesitant to send my ECU away to have it remapped, or reprogrammed, or flashed, etc., kindly communicate to me whether I can install my new Stage One exhaust and use my original ECU. My 3W was manufactured on 09/2015.
Thank you very much.

Tom

Hi Tom,

Your stock ECU will cope with changes to the exhausts and air filter. It's only when you go to higher lift cams, such as the 569, that the ECU needs re-mapping. .

For info, I doubt very much that MMC would reflash an ECU for a third party upgrade as the reason it is locked is to meet emissions regulations.

Red Leader: Thank you very much for the reply and clarification. I will be receiving the new exhaust system at the end of this month, and will report on its performance.

Best regards,

Tom

When the Stage 2 cams are used you will get the message on ProTune , “exceeds maximum limits” or something to that effect but it does not say which limits it exceeds. Do you know what has been exceeded?

It's the Fuel Trims that reach their limit. There's probably 10-15% flexibility in fueling control within the stovk map, in response to the Lambda sensor output. Stage-1 allows a better flow, resulting in more air and more fuel requirements. There's plenty of headroom available in the injectors (known as their Duty Cycle) and indeed stock injectors are fine with Stage-2, 569 cams, but the stock ECU map can only compensate by a cerain amount. When the lambda signal says I need more fuel, but the stock map says that it's giving all it's allowed to do, then a Limits Excdeeded message gets flagged. Risk is that the engine will be running lean, which isn't great, but in truth it's unlikey to be that far out with just a Stage-1.

If fuel pressure was increased do you think that would shoot more fuel into the cylinders across the entire range and sort of compensate for the limits of the stock fueling system?

In a word - no.

The issue isn't getting fuel into the cylinder, it's the lambda reading of the mixture. With the stage 2 cams the engine is breathing better than with stage 1 and so needs more fuel to keep the air/fuel ratio. The locked ECU will adapt by richening the mixture as revs rise until it hits the adaptive limit. At that point any further increase in revs will lean out the mixture.

With an unlocked ECU the base fuel mapping can be set richer at higher revs so the engine runs with a acceptable air/fuel ratio