Mk1 golf DTA ECU wiring

Thanks once again for the advice, I had no idea any of the k jet relays had a built in rev limiter.
I think I'll find a separate socket and wire a seperate relay in for the ecu. Am I right in thinking all the P terminals are direct feeds from the battery then? It's been that long since I took it all apart I can't remember how the battery is physically connected to the fuse box.
As for the fuel pump there is a trigger wire from the DTA ecu to activate the fuel pump relay so that's not a problem. I'm tempted to run new wires in for this also for peace of mind.
I take it there is something about the 3 relays you have mentioned that work without the coil feed?

 

Thanks once again for the advice, I had no idea any of the k jet relays had a built in rev limiter.
I think I'll find a separate socket and wire a seperate relay in for the ecu. Am I right in thinking all the P terminals are direct feeds from the battery then? It's been that long since I took it all apart I can't remember how the battery is physically connected to the fuse box.
As for the fuel pump there is a trigger wire from the DTA ecu to activate the fuel pump relay so that's not a problem. I'm tempted to run new wires in for this also for peace of mind.
I take it there is something about the 3 relays you have mentioned that work without the coil feed?

 

Thanks Okay so my plan now then is to get 3 VW relay holders to clip to the top of the fuse box (I'm also fitting a wideband lambda kit) and wire them all in seperately. I'll look at the main feed to the fuse box and decide whether I need to refresh this or not. Would it be easy enough to rewire that with new cable or are the connectors a pain to get hold of?
Are the vw relay holders available from new or will I have to find them second hand? Do you have a part number for them? Thanks for taking the time to answer all these questions .

 

Top Man! I'll get shopping for these parts now then. Is there a convenient point in the back of the CE1 fuse box to take ignition feeds from for my 3 relays?.

 

rubjonny, you are a mine of info,
Jon

 

Here is an attempt to summarize my comments from post 11 as well as what was said before and after.

If you wish to have a single solution, using the factory Central Electric fuse box this illustration below shows what to do and where the relays, connectors and fuses are.



Alternatively, if you wish to hook up the ECU as suggested by Sambo and Jon then you can use this diagram. You can still use the fuse box for the fuel pump relay.



Hope it is clearer for all

 

For OE fusebox solutions, where the engine was originally fitted with K-Jet and is being updated with a SEM, is the principle is the same. So my suggestion is fit a similar relay from a Digifant 2 or 3 vehicle. I do not have these to hand at the moment. So feel free to have a look and I can update the picture.

'N' is not fused. Correct. On 1988 'CE1' MK2 Golfs this is used as the injector output and is common with E14 via an internal fusebox track. Therefore in the pump stops via J17 so does injection.

 

Not recommended.
Coilpack supply should be as factory, i.e. from KL15 or the original single coil pack source. The 12v feed to the ECU from R1 or from the standalone 4 pin relay is just that, a 12v feed to the ECU.

The same principle is run in my JENVEE, which covers up to 20K miles a year with no electrical gremlins.

 

A fountain of knowledge to digest! Think I'll have a good few reads through it this evening to digest it all! Great stuff.
The loom in question is a standard 1983 mk1 golf GTI loom. Doesn't look in bad condition but I guess that doesn't mean a lot.
I'm fitting a 16vg60 engine, using a Ford generation 2 coil pack and a crank trigger, wasted spark, batch injection.
Not having done anything like this before I thought it best to proceed slowly and ask plenty of questions which I'm glad I did
I've ordered 3 bosch 0332 014 112 relays and 3 relay holders which John gave the part number for earlier in the post. Out of interest will the holders come as blanks or wired up with terminals?
The 3rd relay is for my wideband lambda kit. I think I'll probably opt to wire 3 new relays rather than relay on the fuse box but ill have another read through everything first.
I'm also thinking of using the spliced power cables from the ecu relay output to power my coil and ill add a fuse to the N supply and supply my 4 injectors from there.
Still need to read back through all of this first though

 

I do not advise loading up the ECU relay output as a Coil output. I would rather keep the coil supply separate from the ECU in case of flyback. Just simply extend the current single coil supply (1.5mm black wire) to the middle pin of the Ford coil pack.
The less you alter the OE system arrangement the more durable the system will work IMO.

 

Ok would there be any harm then in feeding injectors off the same supply as the ECU? And feed the coil separately from the N terminal?

 

It is not common practice for manufacturers to wire the coil a non amplified coil pack from the same supply as the ECU.
The supply for this usually comes from the ignition key. I am quite familiar with the flyback voltage and various validation tests done on the coil pack you will be using and would strongly suggest you run the terminal 15 or KL15 from the old coil to the new coil pack. A spike of 80+volts will do the ECU no good, hence keep them separate.

The the N terminal is the same as the output for the fuel pump supply and is the most robust connection for the injectors, which will stop injecting if the fuel pump relay were to stop energising.

Ultimately you do follow what ever you think will also work. No harm in that.
What I have been describing is what I run on my own car with a SEM without any electrical faults over thousands of miles, so there is confidence in that method.

Good luck and keep us posted.

 

Agree this is a really good resource this particular thread. When integrating an after-market ECU like Megasquirt which I used, I do like to make the installation 'factory' as possible.

In the case of my MS installation I just assembled a loom to plug straight into the CE2 fusebox ECU connectors, taking the ECU power via the normal ECU relay, and so forth. So the Digifiz loom is just unplugged and Megasquirt loom plugged in place. I appreciate the OP is talking about CE1.