tim124
Part of things
Posts: 128 
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Jun 14, 2018 19:14:05 GMT
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As title, does any one have a link to the ignition only diagram ? thanks
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Adey
Posted a lot
Posts: 1,343
Club RR Member Number: 171
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Jun 14, 2018 20:02:14 GMT
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probably not, its designed for a 1397cc 4 pot using a 44-2-2 trigger.
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Jun 15, 2018 23:42:52 GMT
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probably not, its designed for a 1397cc 4 pot using a 44-2-2 trigger. it worked perfectly on the 1.8 16valve R19 engine I fitted into my R5. and would rev to 8000 rpm. in fact the 1.8 engine fitted straight onto the R5 gearbox, it was such an easy conversion. I ran it on Weber 45's and had 30 more horsepower than a fuel injected engine. I did this 20 years ago. but no it wont work on a V8. |
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Adey
Posted a lot
Posts: 1,343
Club RR Member Number: 171
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yeah itll run that, i wouldnt say perfectly though, it could of ran better as a high comp 1.8 on carbs really needs a different ignition map to a low comp pushrod designed for boost. its just a very basic unit with retard for boost no rev limit on them though? most renault gearboxs will interchange with the correct flywheel fitted untill the newer 6 speed nissan shared stuff came along. i want to see if a 1.8 16v or 2.0 f4r will bolt up tp a 4 speed renault 12 box i have kicking around.......
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Last Edit: Jun 16, 2018 4:16:12 GMT by Adey
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Jun 16, 2018 16:56:45 GMT
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i wouldnt say perfectly though, it could of ran better as a high comp 1.8 on carbs really needs a different ignition map to a low comp pushrod designed for boost. just guessing or actually tested? it ran spot on, no hesitation, no flat spots and pulled all through the rev range. for the price it cost me, i.e. nothing as it was attached to the vehicle, it ran perfectly good enough. I could have spent a fortune and tried to fit a clever adjustable ignition ECU to maybe only find there was no improvement? and don't forget I said this was 20 years ago when aftermarket ECU's were fewer and far between. I used to work at a rolling road so saw many Renault 19 and Clio 16valves so had a good data base for a comparison. there was no loss in midrange and at high rpm the power just kept climbing. hence I knew it had 30 more horsepower over an injected engine and wasn't just a number plucked from nowhere. I also have no problem in tuning carburettors. at the time I could buy brand new Weber 45's for £90 each and a few bits of metal to fabricate an inlet manifold cost just a few quid. the engine cost me £400 from a breakers so you should get the picture that I didn't spend a fortune on this conversion. the car itself was an EX Renault 5 Turbo Cup Car that I bought post crash and repaired. it (hence the Q plate) as there were no inlet manifolds available to fit Weber 45's at the time I had to make my own. the length I made it was just a random length to fit in the engine bay. I now know a lot more about ram tuning and at the time I did the conversion I never did an advance curve check. I just moved the sensor on the bracket and did power runs on the rolling road. if I was to do the same conversion today i'd probably do exactly the same with the ignition. it was so easy.   . |
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jikovron
Part of things
mechanical chaos
Posts: 633
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Jun 16, 2018 17:19:35 GMT
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i can concur with Bozwell in that the renix coil module thing does work great with f7R engines on twin webers, i last experienced this in a pals volvo 340 which went from a 1.4 C1J to a F7P and latterly F7R,,, fast!!
As for the v8 application it would be possible to use it but you would need one of 2 methods an 88-8 trigger wheel (-2 at 90 degrees separation) and effectively use the distributor to simply direct the sparks , the drawback to doing that is that it would compress the advance curve by 50%.
Or alternatively on a single 44-4 trigger wheel you could run two renix modules in tandem and have the crank sensors 90degrees apart however this would require both plug leads to go to the king post on the distributor, not sure if the RF flyback and HV volvage at the none firing module coil would cause issues though but even that could be mitigated with 2 seperate 4 cyl dizzy bodies
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Adey
Posted a lot
Posts: 1,343
Club RR Member Number: 171
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Jun 16, 2018 17:46:52 GMT
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I'm not doubting that it worked or that it didnt run right or wouldnt work on a 1.8 16v on carbs. But the facts will be that the ignition curve for a low compresion 1397cc engine from a renix 208 or 209 will be be different to what would be best for a higher compression carbed 1.8 16v engine?
I love the out there thinking and the way you did it, i would of done exactly the same if i did carbs, though when i did a 1.8 16v into a 5 i kept all the injection system too. I wasnt knocking it in anyway, maybe i should of written it wouldn't of been optimum? though obviously with you setting it up on a dyno, tweaking the tdc position, checking fueling and listening for det would of given you the best you could get with that setup?
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Jun 16, 2018 20:30:09 GMT
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the ignition curve with that set up would be just like a distributor with no vacuum advance or retard so quite basic. so at light throttle yes there would be no extra advance but that's normal with a Weber set up due to the pulsing at each intake anyway. so maybe not perfect timing at light throttle but it was never a problem with driveability. Back to the present i'm actually fitting a pair of Weber 45's to a F20c S2000 engine (with another fabricated inlet manifold). with that I have a No-Diz which will activate the V-tec and have a throttle position sensor for light throttle ignition mapping. that runs a 36-1 wasted spark system and can also run a temperature sensor to be programmed for more advance at idle on a colder engine to prevent stalling when cold. not yet run but I doubt it'll be a problem. iv'e made the inlet manifold purposely long to hopefully take advantage of the harmonics at a lower rpm but the harmonics will change with V-tec. if the calculations are right it should have a decent mid range but the carbs will be too small for high rpm power. It will rev to 9000 but the power may drop off at about 7000. Still be quick in a 800KG vehicle with a shorter wheel base than the old Mini  . there is a No-Diz available for the V8 which will run two wasted spark coil packs. |
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ChasR
RR Helper
motivation
Posts: 10,192
Club RR Member Number: 170
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Jun 18, 2018 15:21:26 GMT
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I was about to say that Nodiz would be my choice if you wanted mappable ignition but with carbs. They seem to be fairly simple to wire up and immensely flexible; it gives you tacho take offs and much more.
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