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Home > MS Code Discussions > MPi injection characteristic data | |||||||
6965 Posts Member #: 507 Fastest A Series Mini in the World leeds/wakefield. |
15th Aug, 2007 at 09:03:10pm
carefull or i'll fire you as my no 1 driver, |
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1641 Posts Member #: 178 Post Whore stowmaket suffolk |
17th Aug, 2007 at 09:49:47pm
me to carl way over my head i think i will stick with carbs its far more civilised rather than being marsian let alone russian!!!! lol always looking for them bigger bunches of bannanas |
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1641 Posts Member #: 178 Post Whore stowmaket suffolk |
17th Aug, 2007 at 09:56:19pm
woh way above my head but i supose threadings are from the afr gauge always looking for them bigger bunches of bannanas |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
18th Aug, 2007 at 01:17:46am
No, they're traces of the crank VR and injectors... :) On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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8604 Posts Member #: 573 Formerly Axel Podland |
5th Jan, 2008 at 07:41:18pm
Sorry to drag up an old thread, but I'm considering injection timing, again.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
5th Jan, 2008 at 09:47:45pm
It's very difficult to see from the data but if the patent is any indication, I think that the fuel is injected on the overlap of the inner cylinder closing and the outer cylinder opening. That would also be part of the reason why you want minimal exhaust overlap with the cam on an MPi.
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4559 Posts Member #: 786 Post Whore Bermingum |
5th Jan, 2008 at 09:53:54pm
Hi,
VEMs Authorised Installer / Re-seller. K head kits now available!
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8604 Posts Member #: 573 Formerly Axel Podland |
5th Jan, 2008 at 10:45:59pm
On 5th of Jan, 2008 at 09:47pm jbelanger said:
It's very difficult to see from the data but if the patent is any indication, I think that the fuel is injected on the overlap of the inner cylinder closing and the outer cylinder opening. That would also be part of the reason why you want minimal exhaust overlap with the cam on an MPi. Jean That is how i always thought it worked until we saw Dave's data. Given that the injection pulse is at TDC on cylinder no. 1, it is far too late for that to be the case. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
5th Jan, 2008 at 10:58:58pm
Could the fuel travel time be about 300 degrees instead of 180? |
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8604 Posts Member #: 573 Formerly Axel Podland |
6th Jan, 2008 at 11:31:23am
I've done some calcs, based on Marcel's method:
Edited by Paul S on 6th Jan, 2008. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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8604 Posts Member #: 573 Formerly Axel Podland |
6th Jan, 2008 at 12:37:21pm
However, if you do the calcs for 1000 rpm you get the same answer, 91 degrees.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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4559 Posts Member #: 786 Post Whore Bermingum |
6th Jan, 2008 at 12:49:48pm
Hi,
VEMs Authorised Installer / Re-seller. K head kits now available!
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520 Posts Member #: 2093 Post Whore Grenoble, France |
6th Jan, 2008 at 10:16:06pm
Paul, do you assume the air speed depends on the VE ?
Edited by alpa on 7th Jan, 2008. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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3 Posts Member #: 9781 Junior Member Ireland |
13th Mar, 2012 at 10:32:53pm
I built a four injector manifold to run on the standard mpi ecu, it wasn’t entirely successful but thanks to the graph in this thread I had reason as to why that might be. I’m now developing a manifold in which the injector angles aren’t as extreme that will hopefully provide better running. But to cut a long story short, which can be found here: http://www.theminiforum.co.uk/forums/topic...r-mpi-manifold/ . During my trials I came up with this theory about fuel injecting Siamese ports using four injectors.
Edited by Dylan8660 on 18th Mar, 2012. |
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5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
14th Mar, 2012 at 01:51:03pm
Dylan,
Schrödinger's cat - so which one am I ??? |
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8604 Posts Member #: 573 Formerly Axel Podland |
14th Mar, 2012 at 06:38:41pm
I'd had a lot of success with mid-pulse timing and firing two/three injectors per port all at the same time. Timed so that the AFRs are equal in the inner and outer cylinders.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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3 Posts Member #: 9781 Junior Member Ireland |
18th Mar, 2012 at 02:27:25pm
Thanks for the replies, I'm sorry for dragging up an old topic but considering its title and content I didn't feel it inappropriate. Although it could be looked at as being staged I feel the reference points for injector events could give a little more finesse of control. I’m not just thinking about simply doubling or tripling up but rather if the use of four injectors could open possibilities that two don’t offer.
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8604 Posts Member #: 573 Formerly Axel Podland |
18th Mar, 2012 at 02:30:14pm
OK, so how do you account for wall wetting ??? Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
18th Mar, 2012 at 02:45:43pm
You're better off using 4 injectors in a staged setup with the current dual pulse or single pulse modes of the siamese code rather than what you propose.
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5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
18th Mar, 2012 at 04:29:43pm
On 18th Mar, 2012 Dylan8660 said:
Another diagram hopefully offering better clarity of thought. Dylan, What you show in that plot is what the MS2-Extra (siamese code) was designed by Jean to do, with the ability to vary the timing points over the whole RPM/load range by setting start/mid/end pulse values at any given load/RPM value. Whether you do it with two injectors, double them up but still acting as two, or stage them from four or six, isn't really the issue. Staging is best IMO but, to achieve the spread you desire in the plots you show is quite straightforward with the siamese code. What I'm not quite sure of from your first post is whether you are attempting to do this with the Rover MPI MEMS CPU which you first mentioned. MEMS is "fixed" code (unless you re-programme at machine code level) so can't be altered like an MS2/3 which is just done from a laptop. Hope that makes sense. Schrödinger's cat - so which one am I ??? |
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3 Posts Member #: 9781 Junior Member Ireland |
18th Mar, 2012 at 05:29:18pm
Thanks Rod, I'm not looking to use the std rover ecu as I'm aware of the re-mapping issues. I was just wondering if it was possible and you've given me a few pointers if I decide to take it onto the next level. If I do I'd want it to be as plug and play with the rover sensors, alarm and immobiliser as possible and from what I've read so far there may problems with that, particualy the tp and flywheel sensors. |
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