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Post by VWthimo on Mar 19, 2018 9:17:06 GMT
Hello everyone!
I recently came across this concept and I'm really interested in using it on my own project.
I have a aircooled 4 cylinder boxer engine out of a VW T3, it's engine code is CV and it originally came with efi, which to me is pretty interesting as it's from 1979.
Now the original distributor will be replaced by an electronic one so there won't be any problems with the points, a custom stainless exhaust will be made and will be completely rebuild.
Now the real question is wether I can make a new little harness and use the Rabbit ECU to run it with the injectors, distributor, airflow meter (it's one of those big boxes that has a flap in it to measure the amount of air that's going in) and I'll weld in a wideband of course... will it work and what other things will need to be modified to make this work?
Kind regards,
Thimo Koolhof
For contact: Thimoaudi@gmail.com
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Post by Admin on Mar 25, 2018 10:42:35 GMT
Hi Thimo,
Yes this will work fine with the Rabbit ECU. You might have to add a couple of resistor dividers to the PCB to bring down the AFM return voltages. I am thinking for '79 model it should have high impedance injectors (>10 ohms)? If not the PWM mode injector driver can probably be used depending on the injector ohms. You probably only have a throttle closed/open switch so no TPS based calculations. But RPM, metal temp, air temp and air-flow are enough to run fine so nothing else would need modification.
Cheers,
Matthew
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Post by VWthimo on Apr 1, 2018 13:13:39 GMT
Hi matthew,
Thanks for your reply, sorry for my late reply, been busy lately.
So basically it should work without major modifications, which is cool but I guess this setup also won't bring much advantage tuning wise.
I've spend a bit of time looking around at the different ways of running things and I would like to know wether RABBIT can run sequential as well?
Then I would just need a crank position sensor, cam position sensor, coils and prefferably different injectors as well, right?
Currently the stock dizzy uses points, yet the later watercooled models had a hall sensor built into them, could I take one of those, take the rotor out and just use it as a cam position sensor? this would be a cheap thing to do, then my only other expense would be a crank trigger setup.
Also, what is everything I need to get started with RABBIT and where can I order it? (things like the ecu itself, wiring loom and other components)
Kind regards,
Thimo Koolhof
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Post by Admin on Apr 2, 2018 14:01:53 GMT
Hi Thimo, Tuning wise you will have full 3D control over AFR and spark timing which is something Jetronic doesn't give. I'm no Jetronic expert but in my experience it delivers close to stoich, then programmed AFR at wide open-throttle according to the throttle switch. I expect to have sequential injection code running soon - the hardware is there and the software shouldn't be too difficult. Yes if you want to run sequential injection you will need high impedance injectors. Low impedance should be OK using the peak hold PWM driver but could take a little work soldering a few components not populated. Sure the modified cam position sensor idea would work fine. Alternatively to keep things simple you could cut a slot in one existing tooth of the trigger vane to get a double-tooth reset once in the cycle and run just on the cam sensor - albeit less accurate than a crank trigger. That will give you full sequential injection and ignition when the software is ready. Upgrade later to crank trigger if you feel the need... For a full rabbit install you need: 1. PCB www.tindie.com/products/ECUMatt/rabbit-ecu-v11-populated-pcb-kit/2. Enclosure www.digikey.com/product-detail/en/hammond-manufacturing/1455N1602/HM980-ND/4601793. Wiring connectors www.ebay.com.au/itm/Rabbit-ECU-Wiring-Connector-Kit/1732238864414. Alternatively for wires www.tindie.com/products/ECUMatt/rabbit-ecu-mixed-terminated-wire-40-pack/5. Controller - recommend Arduino Due they are easily found on ebay Sounds like an interesting project! Best Regards, Matthew |
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Post by vwthimo on Apr 18, 2018 19:15:01 GMT
Sorry again for my late reply, been busy lately and with finally nice weather here in the Netherlands, a lot more things get done so less time on forums sadly...
Too bad full sequential hasn't been developed yet, but I assume that it can run semi-seq.? I'm looking in making a small sprocket in an emptied dizzy and then make a vr sensor in it that van read it (of course I'd cut one tooth off), then use that as my trigger and run sequential that way, would that be any problem?
Also what software does RABBIT support, you can use tunerstudio or does it need some other software?
Kind regards,
Thimo Koolhof
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Post by Admin on Apr 20, 2018 10:22:57 GMT
Hi Thimo, The software from me is MAP-MATE you can find it at the support page mdac.com.au/support-documents/ I know of Tuner Studio it looks very nice. MAP-MATE uses standard automotive CAN protocols and I hope to add some more nice OBD2 features to interface with the OEM controller soon. The Rabbit ECU does have sequential injection and ignition - I've been testing it few a few weeks and looking for more testers who are willing to give it a go :-)   mdac.com.au/2018/04/18/sequential-injection-ignition-using-ecuhost-rabbit-ecu/Cheers, Matthew |
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