DDK - Die Deutschen Klassiker

Glad it's gone to a good home

Gary,
Just been looking at the wiring. I think I've found your problem....



The Purple and green wire is the switched 12V and it just came off in my hand ! The MS would have reset like crazy, and the EDIS would have flicked from timed, to limp home at will !! I will double check the rest.

I know, you always did say that you didn't approve of the D-Type connectors on the Megasquirt !!
Cheers
Tim

That will be my quality soldering then

I'm sure a decent connector and your trained soldering hand will sort it out

I'd just re-solder the whole thing if I were you.

I've not given up on this project, it is still a part of putting my Targa back on the road. To this end, I have dug the wiring out and started to test it out on the bench. I've made a small circuit to simulate the 36-1 toothed wheel that will be installed on the crank. I can tweak a pot and take the revs up to 7K rpm in 500RPM steps. I figure now to check out the wiring.

It all works, spark only. Currently the tacho is driven form a seperate circuit, but will be driven by the Megasquirt.
Next step is to look at the fueling.
I plan to make a test rig by screwing the inlet manifolds to a plank of wood and then put the TB's on to that. I want to use the same spacing as would be on the car. This way I can make sure I finish off the looms to the correct length and look at the linkage etc.
As my engine is in pieces, can someone tell me the distance between the centre line of the inlet ports on opposing heads ? The engine is a 2.4 T
I guess that No 6 sits on a line exactly half way between No 1 and No 2 ? yes ?
Your help is appreciated.
Cheers
Tim

Ok, I've been fiddling, here goes
Here is the kit as I've set it up for testing. The Inlet Manifolds and TB are roughly where they would be on the engine.

This is the Megasquirt itself, lid removed. I've still to tidy the soldering to the main connector. The white wires inside the box are the Beefed up F-IDLE circuit (Fast Idle)

Here is the NS bank of TB's, fuel rail and injectors inboard. The TPS (Throttle position sensor) in the back corner of the engine bay.

This kit is actually running in the photo, you can't tell but it is.
The circuit infront of the Tacho simulates the VR sensor and 36-1 toothed wheel that would be on the crank. The bottom LED is 500RPM led and the other LEDs show 1K rpm each so showing 3K rpm at the minute. Tweak the POT and the Rev counter follows!

This circuit triggers the EDIS module (Coil pack is un plugged to prevent sparks from flying) which then feeds pulses to the Megasquirt.

and away it goes, Injectors pulsing away. The Tacho trigger comes direct from the MS (I've had to change one resistor in the Tacho to get this to work, and the MS has a small transistor mod done to add additional drive for a tacho but I'm not too sure this was necessary but it does work.
I have The TPS, IAT (Inlet air temperature) and CHT (Cylinder Head Temperature) sensors all feeding back to the PC.
Oh, and here is the Relay block that sits next tot he fuse box up front

All really cool, and almost entirely using Gary71 wiring loom. So Gary, the work you did was all good and your diagrams are spot on, thanks. Just a little tidying required.
I now need to think about how to adapt the throttle linkage, but following the way the Zeniths work is probably a good plan.
Cheers
Tim

Fasinating and fantastic!

Very interesting to read this, Tim: you must be pleased?

Very interesting Tim -you are one clever bloke

He's not clever, all he has done is broken open a couple of ZX81s and trailed loads of wire over them to make it look 'technical'

Can you see why I passed this project over?....

The mechanical side of things was fine, these damn electrics were beyond me!

Gary71 wrote: these damn electrics were beyond me!

No Gary, clearly not. Everything you did has been spot on, save one badly soldered joint ! It is nice to be able to active bench test before installation though
Tim

Tim was you making engine noises when blipping you're virtual throttle followed my screeching of tyres?

bet you had the 'air steering wheel' as well, rocking violently from side to side whilst taking fast corners.

Cool

When's it going into production then Tim?
Regards Matt

OK, some movement on this project.
Throttle bodies in place on an engine. And a throttle linkage
Basically, its a cable to each TB, which is how the Triumph TB's are designed to work, linked to the std Zenith primary throttle quadrant , which is how the car is designed. A simple slider to join the two together and some adjusters to match the two spindles.

Another view.

It's scruffy for now. I want to know if it works before making it pretty.
The only problem so far seems to be that the now 6 throttle return springs, 1 on each TB, make the hand operation of the linkage somewhat heavy !!
Tim

Looks good Tim, as you know this was one bit I never sorted out. I was planning a Jag V12 style central rotating pillar that then actuated each quadrant.

I like your set up though. Much simpler, and adjustable I see