Emerald M3D LTD

Emerald M3D LTD Standalone Engine Management He is currently Technical Editor at Practical Performance Car magazine and a regular contributor to Track Driver Magazine.

We are the creators and manufacturers of aftermarket standalone K6 ECU (Engine Control Unit) or EMS (Engine Management System) with over 17 years of experience in automotive electronics, engine management and calibration as a company. Founder of Emerald M3D Ltd is Dave Walker, well known in the UK for his many articles and features in various motorsport publications and huge experience in engine m

anagement, Dave has now celebrated 50 years in the automotive industry. Our aim is to provide user-friendly, capable and reliable engine management systems with 1st-class back-up and technical assistance – whilst at the same time not costing the earth. Emerald engine management systems are capable of handling full 3D mapping of both ignition and injection on most normally aspirated and turbo engines – from classics through to the latest engine designs. Emerald systems are both straight-forward and logical to use and many of the "big" features found in competitor systems are included as standard in Emerald’s ECU’s. Work is always ongoing to add more features and functionality to cater for the ever-growing diversity of engines and customer requirements. Future developments will include adding new features to the K6 ECU as well as expanding the product range and further enhancement of on-site and over-seas facilities and support in addition to our already extensive base of dealers in different parts of the world.

Luke brought his supercharged S2000 back to us last week for a tweak after he fitted a new exhaust and began suffering a...
15/04/2026

Luke brought his supercharged S2000 back to us last week for a tweak after he fitted a new exhaust and began suffering a misfire.

Pretty soon we discovered that although the exhaust had gained us some power and thus made the car run lean at WOT, this was not the cause of the misfire. The oil seal on cylinder 4 had slipped off and allowed the plug hole to fill with oil! A quick and easy fix.

After a bit of optimisation we ended up at 389bhp, carrying the power all the way to 9k whereas it had previously choked up above 8k. This car has a JDM high comp engine fitted and was heavily knock limited, with some high octane fuel it’d be well north of 400bhp!

17/02/2026

Last week this flawlessly prepared Mini competition car was brought to us for a tweak after a decrease in valve size. The car uses the popular BMW K1200 head swap to extract every last horsepower out of the little A Series. Whilst we had it we also set up the flat-shifting feature available within our K6+ ECU’s, which the customer is looking forward to testing on track!

The move from the oversized valves it ran last year back to standard valves was purely due to parts availability, and given the relatively small performance hit, it’s a no brainer to reduce mid-season down time.

We thought we’d give a little snapshot of some of the interesting cars we’ve had on the rollers over the past few months...
26/08/2025

We thought we’d give a little snapshot of some of the interesting cars we’ve had on the rollers over the past few months, some more successful than others, in no particular order:

A fantastically finished TVR Cerbera with the flat plane crank AJP engine, although unfortunately this one was rather short lived! It came in for an ECU fit & map but after doing a quick ‘before’ power run on the factory management it started pouring white smoke out, a suspected head gasket failure👎.

Next is a little Alfa Romeo Giulia, it had visited us 18 months prior but made disappointing numbers due to having the VVT unit removed and the cams being left at standard timing. It came back to us once this was refitted and with a bit of wiring and a remap we’d picked up 30lbft across the entire rev range, probably the cheapest 40bhp he’ll ever get!

Then a Porsche 911 3.2 from with an ITB conversion courtesy of . This was one of those rare jobs where there were no problems and we could focus on getting a nice result without any dramas! An especially uncommon event for a Porsche😉.

Another well presented car was a MK2 Golf with the ever popular 1.8T swap. We ran into some potential issues with the actuator which limited the power it could make, but having spent all day chasing various other issues (note the darkness outside the workshop, this was in July!) we decided to leave it for another day. We still got around 240bhp which should be more than enough to enjoy over the summer.

And last but not least was a Ford Capri with the early 70’s style widebody kit, reminiscent of the old touring cars. Laying beneath is the 2.9 BOB engine, the 1.8T of the retro Ford world! Here we had another case of factory fitted parts being removed without the necessary modifications, in this case it was the variable inlet ‘VIS’ unit fitted to the BOB engines. These are crucial for top end power, without it you get a steep drop off in torque from around 4500 onwards and a horrible shaped curve, the owner wasn’t too bothered about peak power figures but we hope to gain another 15-20bhp upon it’s return with the valve refitted.

We were digging through some old stock this morning and found some unused Jenvey manifolds, two new old stock and one re...
23/05/2025

We were digging through some old stock this morning and found some unused Jenvey manifolds, two new old stock and one returned order. To clear up space we’re selling them off for a discounted price, descriptions can be seen in the photos with more information available on Jenvey’s website. If you’re interested in any of them get in contact via email or send us a message on Instagram or Facebook!

1. Peugeot TU5 1.6 16v to suit ST single throttle bodies £200+VAT (New, unused)

2. Honda B16/B18 C5 to suit SF single throttle bodies, includes fuel rail £200+VAT (New, unused)

3. SR20VE to suit SF single throttle bodies £180+VAT (Returned order, possibly fitted but not used, few cosmetic marks but no damage)

Prices do not include shipping.

Two lovely Sierra 4x4s in recently, both turbocharged!The first had some issues with building boost, as you can see in t...
16/05/2025

Two lovely Sierra 4x4s in recently, both turbocharged!

The first had some issues with building boost, as you can see in the torque curve, it was very slow to come on. We did all the usual checks for boost leaks, stuck open wastegates etc but couldn’t find anything. In the end we put it down to the ebay special turbos but it still made decent power at 284bhp and 295lbft, more than enough to give some unsuspecting fiestas a run for their money.

The second one was a bit more lively, running some hybrid turbos on slightly higher boost pressure. Unfortunately it left on the back of a trailer about a mile up the road after a ‘spirited’ test drive knocked loose the fuel pump inside the tank, but is now back up and running and being thoroughly enjoyed.

Had a bit of a rarity on the rollers last month in the form of this B3 Passat. The customer bought the car already conve...
16/05/2025

Had a bit of a rarity on the rollers last month in the form of this B3 Passat. The customer bought the car already converted to the ever popular 20v 1.8T but had some running issues, along with upgrading to a larger turbo.

Unfortunately a fuel supply issue cut the day short but we’re looking forward to seeing it back soon to have the mapping finalised and make some power!

Had a lovely Dolomite Sprint in last week for mapping and was pleasantly surprised by a distinct lack of issues!These we...
04/03/2025

Had a lovely Dolomite Sprint in last week for mapping and was pleasantly surprised by a distinct lack of issues!

These were the first mass production car to utilise a 4 valve per cylinder lay out, although still using a single cam with an interesting ‘hybrid’ set up where the cam is mounted directly over the intake valves using conventional tappets (like that of a dohc head) but using rocker arms to actuate the exhaust valves in place of a second cam.

This engine wasn’t built for maximum power and even retained the factory cast exhaust manifold but still had a healthy bump from a claimed ~130bhp factory to 170bhp and 153lbft with help from a set of throttle bodies and a camshaft from .

Not something we usually do but  brought this Ultima GTR to us this week for a bit of diagnostics and a power run. The c...
14/02/2025

Not something we usually do but brought this Ultima GTR to us this week for a bit of diagnostics and a power run. The car is still on a carb and MSD distributor set up and had been running into fuel starvation issues after long stints of full throttle, but this seems to have been fixed with a few maintenance items. Although we wouldn’t normally take on work like this, troubleshooting problems like this on the road is often very difficult and can get rather dicey so the rolling road makes the perfect test bed.

Humphris Rallysport brought a customer’s K11 Micra to us yesterday for some diagnostics and a mapping session. The car w...
06/02/2025

Humphris Rallysport brought a customer’s K11 Micra to us yesterday for some diagnostics and a mapping session. The car was recently swapped from the standard ECU to our K6+ to get the full potential out of the modifications that’ve been made, but initially wouldn’t start.

A morning spent with the multimeter, a replacement oem loom and a custom made adapter harness later though and it started right up, and we were very impressed with the end results!

With only a few mild modifications courtesy of Humphris Rallysport the power output from the little 1L was almost doubled from around 50-60bhp in standard form to 105bhp as it stands, and with an amazingly flat torque curve given the nature of the engine. We’re hoping to see a few more of these in the future as they gain popularity for use both in track and rally competitions.

Our first little project this year was this tidy, albeit slightly dusty, MGC. Upon release these were seen as a bit of a...
04/02/2025

Our first little project this year was this tidy, albeit slightly dusty, MGC. Upon release these were seen as a bit of an ugly duckling among MG’s other offerings, mainly due to the sizeable increase in weight that came with the 2.9l straight 6, and production was stopped after only 2 years. Nowadays they’re becoming quite hard to find due to the relatively small initial production numbers and seem to be a bit more appreciated for what they are.

To breathe a bit of life into the old engine it’s been rebuilt and converted to EFI using Jenvey Heritage throttle bodies and now puts out just under 170bhp & 180lbft of torque. This sounds rather unimpressive by modern standards, but for an engine designed in the early 50’s it’s not too bad!

After putting up quite the fight with wiring issues, mechanical failures and a nice variety of fuel and air leaks, Will’...
08/11/2024

After putting up quite the fight with wiring issues, mechanical failures and a nice variety of fuel and air leaks, Will’s KE30 Corolla is finally finished and ready to be enjoyed. It’s always nice to get something unique through the doors and this is certainly that. The original engines been swapped out for a 1.8 BP from a MK2 MX5 which not only gives a bump in power but also makes it a hell of a lot cheaper and easier to source parts when compared to something like a 4AGE or 3SGE, which you might expect to see swapped into one of these.

Address

Unit 6 Norwich Road Industrial Estate
Watton
IP256DR

Opening Hours

Monday 9am - 5:30pm
Tuesday 9am - 5:30pm
Wednesday 9am - 5:30pm
Thursday 9am - 5:30pm
Friday 9am - 5:30pm

Telephone

+441953889110

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