Emerald ECU etc.

amarshall · Post by **amarshall** » Wed Sep 20, 2006 18:29

I'll shortly be picking up the 2nd hand fuel injection kit that I posted about on here a few weeks ago. As several others have done, I intend to start with the simpler stuff, meaning mapped ignition.

Does anyone have any map data for a standard 912 engine ? Even a close approximation would be useful so that I can get the kit installed and then drive to the rolling road for final setup.

amarshall · Post by **amarshall** » Sat Oct 14, 2006 22:05

BUMP!

So, has no-one actually got an ignition map for a carburetted 912 engine then ?

What about all the people who've declared that as a first step to fuel injection ?

Steve C · Post by **Steve C** » Sun Oct 15, 2006 13:00

I've got the ignition runnning on mine, but I just programmed an RPM based ignition curve so it looks like a distributor with only centrifugal advance, 10 deg idle up to 30-something from about 3000rpm on (dizzy specs are in the manual). I'll get it all mapped properly once the injection side is fitted ...

Sorry!

amarshall · Post by **amarshall** » Sun Oct 15, 2006 14:33

Thanks Steve - that's the sort of thing I need to know before I start fitting it at home. I need a working basic map to allow it to be driven to the rolling road.

Steve C · Post by **Steve C** » Sun Oct 15, 2006 21:19

I drove mine for about a week like that to shake down the installation. My fuel pump failed at the end of that week so as part of the diagnosis I reconnected the dizzy ignition. It ran fine with that curve, although a little lumpier when cold because there was nothing to emulate the 30 deg advance given when the engine was below 60 deg (or whatever one of those green valves activates at).

My ECU has a neat hand controller so I could tweak the map on the run as well as see status info without needing a laptop ... it was interesting hearing the engine note change as the ignition advance was adjusted!

amarshall · Post by **amarshall** » Sun Oct 15, 2006 21:24

Hmmm - that's useful info too - the Emerald does allow for the ignition map to change depending on temperature, so it sounds like a need a temp. sensor fitted before I fully connect up for ignition.

Thanks, again, for the info, Steve.

Dr_G · Post by **Dr_G** » Thu Oct 26, 2006 23:58

amarshall:- How are you getting on with this?

I spoke to Emerald about a throttle body fuel injection conversion and they said they would sell me a kit for around £1700 and would charge ~£300 for mapping it once I had fitted it. They said they couldn't give out any base maps for our cars.

To be honest, I would love to convert the car to fuel injection, but I have no time or inclination to do so by myself at present, and would prefer to pay the money to get someone else to do it.

amarshall · Post by **amarshall** » Fri Oct 27, 2006 11:24

Haven't started the work yet - still in a rented house with no workspace and a lease that prohibits anything other than very basic maintenance

The grand plan for the new house fell through because of problems with neighbours....

Steve C · Post by **Steve C** » Fri Oct 27, 2006 11:35

amarshall wrote:Hmmm - that's useful info too - the Emerald does allow for the ignition map to change depending on temperature, so it sounds like a need a temp. sensor fitted before I fully connect up for ignition.

Thanks, again, for the info, Steve.

My ECU has inputs for (and was supplied with) air temp and coolant temp sensors. By default, it calculates the extra fuelling when cold etc, but also allows some tweaking - I guess to compensate for the fact that air temps may change slightly through the manifold etc. It doesn't have the ability to change the ignition map based on temp but then I don't have the ability to work out what those changes might be anyway!

I've bought an Innovate LM-1 so I can get the mixture right on light and heavy load ... ignition is a little bit of a mystery to me since it seems dependent on volumetric efficiency at different engine speeds / throttle openings ... I think I'll take it to a rolling road for that! It's very interesting plugging an OBDII monitor into a "normal" car and watching the ignition map ... tried it in the wifes V6 mondeo and there are some serious swings in advance!

I'm running out of excuses for not getting on with it now .. I've got 10 days holiday left to take by the end of the year. I must be able to get it running on injection in a week ... famous last words?!

mds666 · Post by **mds666** » Fri Oct 27, 2006 11:50

if you want someone to do an EFI convirsion for you or supply any of the bits try talking to Mr Taylor of lotusbits, he is a distributor for jenvey and DTA i think there are a few Excels with that combo now so a base map mite be easir to find too, not to mention thats what he uses on his rally 912 unit too

Danny · Post by **Danny** » Fri Oct 27, 2006 19:00

yep, i'd agree with the last post, speak to Mike at Lotusbits. He can supply as much or as little as you need and plenty of advice on what bits are required, the sensors, fuel pump, regulator and injectors can be sourced from the scrap yard to save money. A usefull site for injector sizing is http://users.erols.com/srweiss/tableifc.html , lists a vast range of injectors and flow rates. I know Mike is building up a collection of maps for 900 engines and supplied some maps to me to get me started with the race car before fine tuning at Northampton Motorsport.I gather he had an emerald ecu before changing over to Dta. If you are at the Lotus parts fair in a couple of weeks speak to him there if not before.
regards

Dan (raceing eclat22)

amarshall · Post by **amarshall** » Fri Oct 27, 2006 23:10

srweiss is obviously a Microsoft user - correct URL is http://users.erols.com/srweiss/tableifc.htm

(no "L" on the end

)

Looks useful.

The Lotus Grand Tourers

Emerald ECU etc.

Emerald ECU etc.

efi maps