Lotus Elan

EFI solutions and comments

PostPost by: gjz30075 » Tue Jan 14, 2020 2:04 pm

Just curious; if one wanted to do the Jenvey Heritage throttle bodies, or maybe any other FI, do you
really need an ECU?
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PostPost by: HCA » Tue Jan 14, 2020 2:20 pm

You will need something to pop open the injectors at the right time. I certainly do not know a system, other than the original Mercedes mechanical type, that does not have a controller
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PostPost by: gjz30075 » Tue Jan 14, 2020 3:14 pm

Ok, thanks, makes sense. I know there were a few fuel injection systems before electronics, but I guess
we're well beyond that now :D
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PostPost by: DavidLB » Tue Jan 14, 2020 4:02 pm

I put a QED set up on my +2S130/5 a few years ago, works extremely well would not go back to carbs
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PostPost by: HCA » Wed Jan 15, 2020 4:10 am

gjz30075 wrote:Just curious; if one wanted to do the Jenvey Heritage throttle bodies, or maybe any other FI, do you
really need an ECU?


Here you go - I was idly looking for some info elsewhere and discovered Lucas make one, very much alive and kicking and an injection system of choice in racing engines of the type where they do not worry to much about variable control.

https://www.howacarworks.com/illustrati ... ion-system
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PostPost by: gjz30075 » Wed Jan 15, 2020 10:15 am

Thank you!
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PostPost by: LaikaTheDog » Wed Jan 15, 2020 8:28 pm

Emerald ecu has a loom that works with heritage throttle body available
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PostPost by: The Veg » Thu Jan 16, 2020 1:22 am

HCA wrote:You will need something to pop open the injectors at the right time. I certainly do not know a system, other than the original Mercedes mechanical type, that does not have a controller


That and I recall the Spica system that my dad's mid-'70s Alfas had. Totally mechanical, had a little pump that ran via a toothed belt from the crank, and from there it had four metal lines up to the intake, each bent in a 360-degree loop to absorb vibrations. I remember my dad telling me about how the part of the loop where the line overlapped couldn't touch lest the metal rub through. And I remember helping him change the belt one, real pig of a job due to the amount of stuff that had to come out of the way, although that didn't keep him from carrying a spare in the boot.
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PostPost by: gav » Thu Jan 16, 2020 7:32 pm

Late to the party but I was running an old Emerald ECU with Jenvey 45s, a swirl pot and filters (you need good filters) over the diff with a high pressure pump from the swirl to the bodies and a low pressure lifter pump from the tank to the swirl pot - all running my twin cam which constantly produced 150 bhp on the rollers and was a really reliable and very driveable engine.
I used Krontek hardline pipes in the carpet under the central arm rest and everything was plumbed so that if I needed to lift the body, it was an easy job.
It ran an absolute dream so when I decided to change engine to a Zetec I reused the entire installation.
The ecu is really old (M3DK) which I bought second hand and runs the EFI, tacho, rad fan and max rev light (it has a soft and hard rev limit features that I use). The only thing it doesn't do that I might like is to sense the exhaust gases and adjust itself and I think that is simply because I don't have the fittings to accommodate this facility.
I like emerald as a company. Dave Walker is still there with Leoni doing their thing and they really helped me with the initial set up. I put the home pc in the garage, plugged it into the ECU, rang Dave and he logged in using teams, downloaded a map that was close, I ran the engine and he roughly mapped it up to 3000 rpm. I then drove to him (approx 150 miles) and we put the car on the rollers and mapped it properly. It now produces a ridiculous amount of power but very tractably.
I think the only thing I would change is having the swirl pot fitted within the tank which should remove the need for the lifter pump.
The car was featured in Practical Performance Car in the Emerald section of the October 19 edition.
You do need good wiring. Most of the problems are with wiring and interference so I used new wires throughout, I introduced a new supply just for the ECU and separate fused circuits for ignition, pumps etc.
I don't think I would go back to carbs now.
Hope this helps
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PostPost by: Craven » Thu Jan 16, 2020 7:59 pm

Now superseded by electronic control but the Bosch K jetronic was an ingenious injection system. No ECU here just very clever engineering.
K Jetronic.jpg
K Jetronic.jpg (24.89 KiB) Viewed 70 times
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PostPost by: pauljones » Thu Jan 16, 2020 8:36 pm

Craven wrote:Now superseded by electronic control but the Bosch K jetronic was an ingenious injection system. No ECU here just very clever engineering.
K Jetronic.jpg



Found on xr3i and 1600i Orion, 115bhp so a good conversion. Used to swap onto kitcars back in the day.

Or if you can find one get an rs 1800 fiesta, full electric control and early ecu was very easy to remap
Kick the tyres and light them fires...!!!!!!!
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PostPost by: HCA » Thu Jan 16, 2020 9:57 pm

gav wrote:Late to the party but I was running an old Emerald ECU with Jenvey 45s, a swirl pot and filters (you need good filters) over the diff with a high pressure pump from the swirl to the bodies and a low pressure lifter pump from the tank to the swirl pot - all running my twin cam which constantly produced 150 bhp on the rollers and was a really reliable and very driveable engine.
I used Krontek hardline pipes in the carpet under the central arm rest and everything was plumbed so that if I needed to lift the body, it was an easy job.
It ran an absolute dream so when I decided to change engine to a Zetec I reused the entire installation.
The ecu is really old (M3DK) which I bought second hand and runs the EFI, tacho, rad fan and max rev light (it has a soft and hard rev limit features that I use). The only thing it doesn't do that I might like is to sense the exhaust gases and adjust itself and I think that is simply because I don't have the fittings to accommodate this facility.
I like emerald as a company. Dave Walker is still there with Leoni doing their thing and they really helped me with the initial set up. I put the home pc in the garage, plugged it into the ECU, rang Dave and he logged in using teams, downloaded a map that was close, I ran the engine and he roughly mapped it up to 3000 rpm. I then drove to him (approx 150 miles) and we put the car on the rollers and mapped it properly. It now produces a ridiculous amount of power but very tractably.
I think the only thing I would change is having the swirl pot fitted within the tank which should remove the need for the lifter pump.
The car was featured in Practical Performance Car in the Emerald section of the October 19 edition.
You do need good wiring. Most of the problems are with wiring and interference so I used new wires throughout, I introduced a new supply just for the ECU and separate fused circuits for ignition, pumps etc.
I don't think I would go back to carbs now.
Hope this helps
Gavin

I am surprised you did not include an EDIS into the equation - that and an O2 sensor, you would really be blown away.. :)
Your point about filters and wiring (clean tight connections is spot on. 8) )
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