'79 CIS TO EFI

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PeterK
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'79 CIS TO EFI

Post by PeterK »

I am posting this on IB, but as I have been asked to cross-post here ....

Well, it was supposed to happen a couple of weeks ago, but it didn't. However, it did finally start today......

The poor, unsuspecting CIS System, sitting there waiting to go out to play

Image

and for those that don't know what an SC engine bay looks like ......
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complete with auxiliary heater blower
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So, new plan includes replacing this
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with some of this
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and these (when they've been cleaned, had new injectors, etc)
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Alex, the Garage b1tch (aka GFB on biker forums) came over, so we needed an initial TODO List (not a chance we would do much more than make a start on it today though)
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So, where to start. Well how about air filter off, and then the rubber boot that joins the throttle body to the inlets.
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Next let's remove the aux blower fan. First by increasing access by ditching the dissie cap and leads
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Then disconnect all the fuel lines (well maybe not all the first time around, as we discovered a little later)
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Then, working our way around the engine, we disconnected all of the electrical connectors and pipework. Alex busy at work, trying to remove the inlet manifold nuts
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It is possible to remove the CIS without dropping the engine, although we did also have to remove the aux air pipework that runs behind & under the CIS stuff, loosen the bracket thingy that the throttle return spring connects to, and a bracket at the rear.
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This is the bracket at the rear that I forgot about initially
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I did remember the rear electrical connections for the 7th injector & the throttle body flap switch, although it needed the CIS system rotating slightly to get decent access.
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I did have to remove the engine breather pipe completely, as I had routed it neatly out of the way during the resto, or maybe that should be had unfortunately woven it through a lot of pipework and cables under the CIS. I also removed the aluminium pipework that goes to the Aux Air Valve, amongst other things and spend a while unweaving harness wires.

Nevermind, out it did come, to be replaced temporarily by some good, old, blue paper towels
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Next was the CDI Box, leaving some loomage work to follow
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Next we popped underneath, and whipped off the exhaust and manifolds, ready for lambda bungs. I"ll be running a separate sensor for each bank
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Oh, and in a minute of excitment, I also removed the passenger seat to gain access to mount the ECU (also for another day)
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All in all, a successful day (which also included replacing a parking sensor on my X1 daily to fix the PDC, and collecting the bits to fix a neighbour's Audi Q5 - he thought that he had stuffed his gearbox, but when I peered under the hood, I suspected that the injector for #4 cylinder probably shouldn't be sticking out 100mm due to a failed retaining bolt, and maybe that is why it wouldn't run nicely. Fitting his bits in the morning).



Watch this space .......
'79 Targa - restoration now mainly complete & being driven
http://www.ddk-online.com/phpBB2/viewto ... 28&t=59756

and now CIS to EFI
viewtopic.php?t=72921
impmad2000
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Re: '79 CIS TO EFI

Post by impmad2000 »

Watching and waiting :)
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SeanP
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Re: '79 CIS TO EFI

Post by SeanP »

Still in the process of collecting bits and pieces for mine
Going with the Maxxecus also, sequential injection and ignition.
watching like a hawk!
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PeterK
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Re: '79 CIS TO EFI

Post by PeterK »

SeanP wrote: Wed Nov 20, 2024 8:32 pm Still in the process of collecting bits and pieces for mine
Going with the Maxxecus also, sequential injection and ignition.
watching like a hawk!
Too lazy to drop the engine just to fit a cam sensor, so semi-sequential for me (at least for the moment)
'79 Targa - restoration now mainly complete & being driven
http://www.ddk-online.com/phpBB2/viewto ... 28&t=59756

and now CIS to EFI
viewtopic.php?t=72921
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Re: '79 CIS TO EFI

Post by SeanP »

Will be interested to see what you are doing with the throttle linkages
1966 912
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LI 125 Lambretta (Yeah right it’s a 125)
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PeterK
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Re: '79 CIS TO EFI

Post by PeterK »

SeanP wrote: Thu Nov 21, 2024 5:02 pm Will be interested to see what you are doing with the throttle linkages
So will I :lol:
I've got a 'starter to 10' linkage from DanST, who supplied my manifolds and trumpets
'79 Targa - restoration now mainly complete & being driven
http://www.ddk-online.com/phpBB2/viewto ... 28&t=59756

and now CIS to EFI
viewtopic.php?t=72921
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PeterK
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Re: '79 CIS TO EFI

Post by PeterK »


So, a new day (although chuffin' cold) and back into the garage for some loomage.

 

When this lot (coffee cup for scale) accidentally falls off 
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you're left with this
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and then if you get crazy with the snips, you get this
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and this
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and this (no longer needed grounds will be removed from the alternator later)
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and then if you're really not careful, this
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and this
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However, we will need a slack handful of relays and fuses in the new EFI world, so we should probably add them here
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Plans are for the Classic Retofit fuse panel to be fed (as per standard) from Fuse 11 (in the front) with a switched 12V.

The standard HRW Relay will stay in its original home

The new fuse panel will be fed with a permanent 12V supply from the alternator (replacing the 2.5mm wire with a larger one, likely 6mm), which will feed the relays, the HRW relay and the rear wiper

The relay box will house relays for the ECU, coils, injectors and the 2 lambda sensors.

 

Did I mention that it was chuffin' cold ?  Well, I also hadn't had a cup of tea for ages (I did have cake and coffee before lunch at Newlands Cafe, being very TB here), so it was clearly now time to go and get warm and watered

'79 Targa - restoration now mainly complete & being driven
http://www.ddk-online.com/phpBB2/viewto ... 28&t=59756

and now CIS to EFI
viewtopic.php?t=72921
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Re: '79 CIS TO EFI

Post by impmad2000 »

I created a slide to pull on two cables, one to each bank of TBs . As I was using the Zenith manifolds, there were features I could use to mount the slide, and pick up off the same pivot .
I never expected it to be permanent , but if it isn’t broke , don’t fix it … years on and it’s just fine and gives a great progressive throttle feel.
Image
Tim Bennett
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Re: '79 CIS TO EFI

Post by PeterK »

That's interesting, thanks Tim.

I had in mind something like this (not mine, stolen from and credit to the interweb)
Image

Also, I see that you placed the injectors facing the middle, whereas most (all ?) other installations I've seen have them outside. Any particular reason / benefits ?
'79 Targa - restoration now mainly complete & being driven
http://www.ddk-online.com/phpBB2/viewto ... 28&t=59756

and now CIS to EFI
viewtopic.php?t=72921
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Re: '79 CIS TO EFI

Post by PMNorris »

This is super interesting. I have a 79SC engine in my 2.2T... Albeit my engine is now a 3.2 short stroke twin plugged beast running 46mm PMOs. The PMOs are great, but I think I would get better performance, improved fuel efficiency and, most importantly better cold starting & idle with an EFI setup. I've seen a couple of cars with the Rennsport EFI kit on them. Very pretty, but very expensive too.
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Re: '79 CIS TO EFI

Post by hot66 »

its going to look great with th throttle bodies 8)
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Re: '79 CIS TO EFI

Post by impmad2000 »

PeterK wrote: Also, I see that you placed the injectors facing the middle, whereas most (all ?) other installations I've seen have them outside. Any particular reason / benefits ?
To be honest, it was ages ago and I don’t remember!
You are welcome to take a look at my setup if you wish.
Tim ( Leicester)
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Re: '79 CIS TO EFI

Post by Gary71 »

impmad2000 wrote:
PeterK wrote: Also, I see that you placed the injectors facing the middle, whereas most (all ?) other installations I've seen have them outside. Any particular reason / benefits ?
To be honest, it was ages ago and I don’t remember!
You are welcome to take a look at my setup if you wish.
Tim ( Leicester)
Inside I think Tim?
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Re: '79 CIS TO EFI

Post by Gary71 »

Think it was about getting back to the original air box, but looking at the picture that seems unlikely!
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Re: '79 CIS TO EFI

Post by impmad2000 »

It is possible to get a spacing at the top of the TBs so that the original airbox could be fitted to the original style metal tray. The angles at the top of the manifold needs to be adjusted to space them correctly. Certainly nothing we set out to achieve when we did this originally Gary.
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"Old enough to know what's right and young enough not to choose it"
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