Water/meth injection control with MSDIYPNP

Sparky714

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Oct 16, 2015
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Just ordered a Snow water meth injection kit. I'm Using a MSDIYPNP to control my 306ci with a Vortec V3 at 10 PSI. Any tips on controlling the kit with the Megasquirt and tune adjustments with the water/meth Steve? @a91what I know I can control the pump relay with a spare output. What RPM/boost level should I set it to activate at?
 
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a91what

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set it to come on with TPS and Boost. maybe 5psi and above 75% you can play with activation settings to suit your needs. Likely you wont build much boost unless you are in it anyway.

Save the tune and once you add meth datalog, see how much fuel the meth is adding adjust the VE table until it is back at a correct AFR. Now I like to use a hobbs switch in the meth line coming off the pump, it will see pressure when the meth is spraying. use this on an input to trigger table switch, set the meth fuel table onto the switch table and then reload the main VE table.
this method is safest.
 
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Sparky714

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Oct 16, 2015
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I like the idea of a pressure switch in the meth line. I was going to use the low level tank switch to activate table switching. But if tank is empty= no pressure and switch to main table. Do to have a link to the hobbs switch?
 

Sparky714

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Oct 16, 2015
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@a91what Just want to confirm I am setting up my output correct. Select MAP and set to aprox. 130kpa for 5psi boost and TPS to about 75% correct? Is a hysteresis about 5 good enough for both?

1589031904288.png
 

a91what

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yes that will do fine for testing, be sure you use just TPS and test the pump for functionality. test modes can be used to but using just tps allows you to be sure you have the power and active values correct [looks like you do but I always check anyway]
 
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