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1267 Posts Member #: 831 Post Whore Montreal, Canada |
11th Aug, 2014 at 07:37:04pm
Looking at your duty cycle, you seem to go up to 50% or more. That is really close if not over the acceptable limit. I would try to size the injectors so that you never go over 40%. That would leave you some margin in timing so that even some inaccurate timing would still leave the injection pulse within the window. Going too high with the duty cycle means that any error and you send fuel before or after the window and to the inner cylinders.
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 (2)[/url] by [url=https://www.flickr.com/photos/150672766@N03/]Rod Sugden[/url], on Fli) 5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
11th Aug, 2014 at 07:39:36pm
On 11th Aug, 2014 Coolmini said:
as i found that even 2 degrees out at wot has a huge impact on the balance. maybe the injectors that i was using were just on the limit. I would say beyond their limit although without knowing how Canems works in detail it's speculaton. The MS2/uS interpolate between cells so you really don't need high precision for injection timing if the injector capacity is well below the open valve window (again I'm talking fully sequential here) but at least that is my experience. The maths for the transit time is also fairly linear, steady state anyway, and a turbo will damp out all the transients, reversions etc you seem to have experienced. This all comes back to you need staged injectors for high power in any siamese sequential mode or will have crap idle from oversize single injectors (if you can even get them large enough). The only proven way so far (with port injection) is fully sequential staged and that needs four chanels. If a semi-sequential staged possibility exists, it has yet to be proven (although, to be fair, there has been very limited running of staged siamese fully sequental yet apart from simulations or on the JimStim but the staged siamese sequential does show all the expected results on the simulatons/JimStim). EDIT - Jean posted just before me, to clarify what I said earlier about duty cycle, when I said 20% max, I was basing duty cycle on a per cylinder basis and on fully sequential. Two short pulses at 20% fully sequential is the same as merged pulse mode or semi-sequential at 40%. It depends how you define duty cycle, per injector in total or per injection per cylinder as one injector has to serve two cylinders on a 5 port. Edited by Rod S on 11th Aug, 2014. Schrödinger's cat - so which one am I ??? |
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17 Posts Member #: 10920 Member West of Ireland |
11th Aug, 2014 at 08:06:45pm
I don't exactly know how canems work internally, and i am not opening the nice weather proof box. which incidentally looks an awful lot like the one that Jean is using for his microsquirt module based one (Chinch i think). i'd say that if Jean got to sell these in bigger volume he'd be on to a winner in general as it does everything the MS2 does and its weather proof, which in a damp country like ireland is very important.
Mini => Money Is Not Important
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
11th Aug, 2014 at 08:40:27pm
As far as I know, Canems basically implemented Marcel Chichak's idea (and also apparently patented it, but that's another story...). That is also what I did initially (also based on my own work dating from before I ever saw his work and way before Canems...).
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17 Posts Member #: 10920 Member West of Ireland |
11th Aug, 2014 at 09:24:04pm
you better patent your work then jean and get paid for your efforts. You might want to start your own online shop with those ecu's.
Mini => Money Is Not Important
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