Technical > Wiring & Sensors

All a bit new to this really...

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tetsujin:
Hi all,

My name is adam, and like PAZ, I am fitting a VEMS unit in the future to a 4age engine with ITB into a 1980 Toyota Corolla KE70, that origonally was a CARB set up.

Now, im not great when it comes to the wire parts in my car, normally someone else takes over and does it for me! :)

to me all this is the most scary part of my conversion and the part I am most NOT looking forward to!! :( but I hope that maybe now this board is set up, I can air a few questions that may seem silly to most but might still be on some people minds who are like me and dont have a clue!! :D

Anyway, I want a neat install and know after speaking to Rob, that I needto send him an old 4age ae86 loom and then he can dissect whats he need and doesnt need to make the loom.

Now what happens when I come to fit it, and the std loom that was originally in the car, that runs the lights, heate etc, what happens to that??

Do I have 2 looms?? 1 for engine and one for he rest of the car??

Also, the fuse box in the ke70 is needed, so what happens there??

Basically Im confussed, VERY CONFUSSED.

I just need someone to tel me its all ok, and its very easy to do.

But the main thing is, I want a very tidy, minimal loom set up in the engine bay.

Thanks all in advance and I know it all seems alot of silly questions but I am stuck in a world I dont know!! :D

Cheers

Adam 

rob@vems.co.uk:
The loom is designed to stand alone, and the fact the thing came with carbs is a blessing really because by the time you'd have stripped out the injection wires you're left with pretty much the same loom as you have now.

The AE86 loom that I do has a single connection to the battery, that feeds via a relay to a group of fuses.
All you need do is take a wire from the ignition switch to the relay to turn the VEMS and its ancillaries on.
One wire to the fuel pump relay and another to the tacho are all that are needed.  You can add control of an electric fan, none of its too tricky.

In summary, you'll have all the standard features of the car's loom as it currently stands, then you'll have a second loom for the ECU, and they are pretty independent - which is not far off what the AE86 with injection has.

Thinking about fuel pumps... You'll need to have a high pressure pump and injection fuel lines.

tetsujin:

--- Quote from: rob@vems.co.uk on January 26, 2007, 03:08:52 pm ---The loom is designed to stand alone, and the fact the thing came with carbs is a blessing really because by the time you'd have stripped out the injection wires you're left with pretty much the same loom as you have now.

The AE86 loom that I do has a single connection to the battery, that feeds via a relay to a group of fuses.
All you need do is take a wire from the ignition switch to the relay to turn the VEMS and its ancillaries on.
One wire to the fuel pump relay and another to the tacho are all that are needed.  You can add control of an electric fan, none of its too tricky.

In summary, you'll have all the standard features of the car's loom as it currently stands, then you'll have a second loom for the ECU, and they are pretty independent - which is not far off what the AE86 with injection has.

Thinking about fuel pumps... You'll need to have a high pressure pump and injection fuel lines.

--- End quote ---

Cheers  Rob

That seems a bit better to understand! :D

I forgot to metion that I have a COMPLETE ae86 as a parts car and everything from engine to bolts are coming of it for my KE70! So I have the std EFI fuel tank and fuel lines.

I take it a std pump is up to the job? What does Paz have??

Hopefully my mate will help me as he has just installed a 'Emeral' ECU into his MK2 Escort Running a 2l Zetec on Jenvey Throttle Boddies. But I would like to get a better understanding of how it works really!

rob@vems.co.uk:
There will be a picture of an installed loom along shortly.
Your mate with the Zetec should be able to help you as most ECU installs are pretty similar to one and other.
The way to get a good understanding is to read all you can, the Autoshop101 technical articles are excellent as they're Toyota training manuals, so the information is pertinent to the car you're working on.
http://www.autoshop101.com/autoshop15.html
Its worth having a read of article number 20 and following on from that.

Obviously as you start your install you can put your project up and ask questions here.

dnb:
Most cars have their loom in "sections".  So it's fairly easy to separate out things like lights, heater, cabin stuff, etc from the engine loom.  

The idea is that the manufacturer then only needs to subcontract out small assemblies and put them together according to the options list specified by the customer.

With the TVR, I more-or-less unplugged the old engine wiring loom from the main loom.  There were only 2 or 3 wires that supplied various things like power and ground.  The rest was all stuff that was isolated to engine and ECU.  Even the engine gauges (water temperature and oil pressure) were easy to separate from ECU stuff.  It was then a case of plugging in the VEMS loom I made (I couldn't reuse the TVR one because it was done in a very silly way) and connecting the power to the main relay output.  

I had VEMS doing fuelling such that the car would just about idle in about 9 hours start to finish.  It then took a month of evenings to get it working such that it was drivable...  and 9 months of twiddling and learning to get it to be a reasonable drive.

The more wiring you see and do the easier it gets... :)  If you're close to the south coast, I'm happy to talk you through how I did mine.  

Std EFI tank sounds a good move.  Although you may need to consider an uprated pump if you want to run higher than standard fuel pressure...  (I'd recomend at least 3 bar base pressure so the injectors work nicely)

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