Hi all,
Currently I have some 18.5lb/hr injectors in my 2 litre straight 6 and my req_fuel is around 11.5ms
The lowest values in my VE table are around 30% - which I work out that the PW is 3.45ms which is within spec.
I wonder about using the "number of squirts" and if it's practical to use 3 squirts per revolution to improve engine response.
I need injectors that are around 12lb/hr to give me 17.8ms and therefore 5.9 req_fuel = 30% of 5.9ms is 1.77 which is borderline to work.
What is the maximum ms?
James
minimum and maximum req_fuel amount
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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jcarruthers
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minimum and maximum req_fuel amount
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Re: minimum and maximum req_fuel amount
Max pw ms is 32 ms, which is way larger than you will ever use.
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jcarruthers
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Re: minimum and maximum req_fuel amount
But the maximum req_fuel is a physical limitation.
Does this maths make sense?
However, the rpm is half that because you can be squirting during the exhaust cycle.
If I were to use injectors that had a req fuel of 16ms
Which is still too small 
I guess if you wanted to do 3 or 6 squirts per rev you need staged then
Does this maths make sense?
Code: Select all
7,000 rpm / 60 seconds = 116.66 revs per second
1000 ms / 116.66 = 8.57ms max pulse widthCode: Select all
1000 / (3,500 / 60) = 17.14ms max pulse widthCode: Select all
16ms / 3 squirts per revolution = 5.33msI guess if you wanted to do 3 or 6 squirts per rev you need staged then
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DonTZ125
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Re: minimum and maximum req_fuel amount
Why are you trying to use 3 or 6 squirts "to maximise engine response"? Full-sequential is a single squirt, and gives the best idle and pretty good response. An idle pulsewidth of 1.77ms (actually +1.0 open time = 2.77ms) should be fine, even with MS1.
