Emerald ECU

are they a good thing to have? If so, anyone have any buying advice.

Not much use for a standard engine.
Useful if you're into modding. Not cheap.:nonod:

I have just bought 2 recently, one was £450 2nd hand, the other was £500 2nd hand but never used complete with a full loom for K-Series (elise)...

Need it on the MGF after the cams and head were done, as its over fueling massively between 0 and 5000rpm, above that its about right...

the emerald gives full 3D map control, and is a direct replacement if you have an older MGF (or needs a wireing adapter if your car is post 2000/2001)...

Very good bit of kit, but only needed if your doing some serious tuning.

Ozzy wrote: Need it on the MGF after the cams and head were done, as its over fueling massively between 0 and 5000rpm, above that its about right...

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I have gone the above route but lack the funds to get the full HP increase, am making do with a FPR at 4.5bar. In Australia we have a Wolf Engine Managment system which I am trying to buy second hand.
So unles you have engine mods in mind you wont need one.