coozer
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| posted on 30/9/09 at 10:27 AM |
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MS Map Sensor.
I am underway with my locost DIY EFi conversion. Construction of the inlet with the original port injectors is going well.
TB's are off a CBR1000RR4/5 and have both TPS and a MAP sensor on them.
Q: Can MS-II use the elkectrical signal from the MAP or does it only use the actual vacuum from the inlet?
Steve
1972 V8 Jago
1980 Z750
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omega0684
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| posted on 30/9/09 at 10:42 AM |
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not 100% but im pretty sure its vacuum
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MikeRJ
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| posted on 30/9/09 at 10:54 AM |
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Megasquirt normally uses it's own inbuilt vacuum sensor, but there no reason it couldn't be wired to an external one. The main issue
would be ensuring the scaling is correct in the firmware.
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big-vee-twin
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| posted on 30/9/09 at 11:42 AM |
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Yes, uses vacuum pipes to built in MAP but can also use TPS or there's a setting called hybrid that can use both the Vacuum pipe/MAP and TPS -
because of instability when Idling I think.
see here link
[Edited on 30/9/09 by big-vee-twin]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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coozer
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| posted on 30/9/09 at 05:11 PM |
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So, from my understanding I'm better of wiring the TPS in for load and let the vacuum go to the pressure regulator?
I'm new to all this, haven't got an MS yet but currently have a lot of hardware to make a system so I'll be asking some
configuration questions atm.
Thanks,
Steve
1972 V8 Jago
1980 Z750
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MikeRJ
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| posted on 30/9/09 at 05:25 PM |
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Throttle bodies can be tricky to get a really useful MAP signal from, so many people use Alpha-N fuelling which just uses throttle position to
determine engine load.
However if you have the option it would be worth plumbing the MS into the existing MAP pipe to see how well it works. Alpha-N isn't able to
compensate for changes in barometric pressure, and is heavily dependant on an accurate and repeatable throttle position sensor. Speed-density is
nearly always the best choice if it works for you.
MS2 allows you to combine both Speed-density and Alpha-N fuelling, though this is more for engines with really poor idle quality due to cams, not sure
how useful it would be for ITBs.
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