Weber retroject as EFI option?

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Sven
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Thu Oct 26, 2017 9:30 pm

So a quick random search and I came across a Weber retroject throttle body that basically is a direct replacement for a Weber carb (38 Dgas in my case) that has every linkage and design of the Weber 38 that is an EFI system. I find this pretty brilliant as an option for the sake of solo ventures in the bush, I could quite literally keep my old carb in a little box and if any electronics did go bonkers I could go EFI to carb in probably less then an hour. I guess the biggest challenge is getting it to SA
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Fri Oct 27, 2017 12:10 am

You would have to install an adjustable pressure regulator so that you could reduce the pressure once the carb is re-fitted. Not doing so would result in the pressure being too high for the float to be able to keep the needle valve closed, which would result in flooding. Otherwise it sounds like a good option.

I also just have to wonder that since injection will take place before the manifold, does it have just one injector? or maybe two? and how is it / are they pulsed? Will an after market ECU have provision for only one or two injectors (this is an unusual way of doing it), or will one have to link all the injector wires to the same injector / split them over two injectors - and then would the feed back through the linked cables have an effect on the ECU? Hmmmm ...... :think:

Before committing to that conversion, I would first verify how many injectors in the system and if less than 4 verify if a locally available after market ECU can accept that.
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Sven
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Fri Oct 27, 2017 5:18 am

So there are 2 injectors inside the throttle body I guess acting the same way as what a carb would. I also wondered about the ecu part with it probably having to be synchronized. there is so little information on the internet about it though.
If they did decide to market it properly it could be a very interesting option for older vehicles like the Ford essex and so forth.

As for the refitting carb, I guess the regulator is the best option, but perhaps just keeping a mechanical pump aswell for trips
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Fri Oct 27, 2017 7:37 am

Rather than go that way, I would suggest rather keep a spare ECU, Igniter & HP Fuel pump if you feel the necessity. Little else can go wrong with the system.


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webconuk
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Mon Nov 06, 2017 5:07 pm

Hello. Just came across this thread, and as the manufacturer of Retroject, thought perhaps we could shed a little light on what it does. As has been stated, its a direct replacement for the Weber 32/36 or 38/38, so if you are replacing one of those, then Retroject will fit to the existing manifold, linkage and air filter. It comes with 2 x Weber 480cc/m PICO injectors, air temp sensor, 3 bar regulator, TPS and IACV. You will need an ECU, which just needs to be a simple fuelling ECU and if you take a speed signal from the coil then you wont need to fit a trigger disk, and lastly you just need an HP fuel supply. Any questions, please just le us know

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Mon Nov 06, 2017 5:33 pm

Welcome Martin and thanks for the info. :thumbup:
When your road comes to an end ...... you need a HILUX!.

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Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!

Mars
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Tue Nov 07, 2017 6:56 am

This really sounds like a great solution. In Europe the first fuel injection Golfs came out with a similar injection system with the main difference being that the throttle body had just one injector. I used such a setup on a Porsche Spyder RSK kit car that I built and it works well. The only issue is with the turbo charger the one 800cc injector is working over 90% of duty cycle so it does not last leaving you with a single point of failure. Using two injectors is a great idea as it reduces the load (which would not be as much on a normally aspitated engine to begin with) giving you the reliability you need. Any entry level go-tech or spitronics will work well.

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Tue Nov 07, 2017 1:18 pm

Mars. Actually a lot of cars in Europe had a single point injection system as a stop gap solution between carburettors and multipoint injection. Bosch, Marelli and Delco all had systems and they were universally terrible, mainly due to the duty cycle issue you mention, but at the time the focus was on getting catalysts on to everything. Twin injector does reduce the load on the injectors, and they are actually production line Weber 480cc/m units which are extremely reliable for up to about 220bhp

Mars
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Tue Nov 07, 2017 3:01 pm

Well Martin I must commend you on a great idea. I wish I knew about this solution a long time ago. As it is I have gone too far down the path of converting my Spyder to multi-point EFI. I already have everything including having modded the Beetle intake manifolds to take injectors etc. BTW I am keeping the Bosch throttle body as is because it gives you a TPS and I am going to use the big injector to enrich the mixture when the turbo is boosting. That way I can run smaller main injectors with quicker response and have a lot of petrol spraying when the turbo kicks in. :thumbup:

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Tue Nov 07, 2017 6:24 pm

Thanks for sharing with us Martin a welcome to our forum
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Tue Nov 07, 2017 9:44 pm

Brilliant idea, just a pity it is so expensive.
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Mars
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Wed Nov 08, 2017 6:39 am

Its the Rand/Pound exchange rate killing us.

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