secondary injectors staging?

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logan.reinisch
MS/Extra Newbie
Posts: 6
Joined: Mon Jun 23, 2014 5:57 am

secondary injectors staging?

Post by logan.reinisch »

I have a Mazda rx7 FC3S
engine is a 13BT running ms3x 1.4.0
ID1000 primary
ID2000 secondary
I am trying to get the ar ready for a tune with my tuner as he is very busy I am trying to get any gremlins out of the way.

From what I can tell my AFR seems to lean out some time as soon as the secondary injectors come online but after about ~1 second it drops and runs rich or as it should. If I move the staging table the lean spike moves it is also never consistent as to how lean I've seen up to a spike to 15 at 2PSI but usually it is closer to only 12. I am hoping you guys have some ideas on what I can run through or look at
datalog.msl
logansTune.msq
Matt Cramer
Super MS/Extra'er
Posts: 17499
Joined: Thu Apr 16, 2009 8:08 pm

Re: secondary injectors staging?

Post by Matt Cramer »

Are the secondaries supplied off the same fuel system? If not, is there any chance that their fuel is initially at a different temperature or pressure? A dead-headed fuel rail, for example, may have the fuel get rather hot when the staging is off.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
logan.reinisch
MS/Extra Newbie
Posts: 6
Joined: Mon Jun 23, 2014 5:57 am

Re: secondary injectors staging?

Post by logan.reinisch »

This is how I have my lines setup I don't see a major issue.

I have another log that may give some ideas.
I am mostly curious about how it can go from 10.8 down to 9.9 but only move .8 on the ve table over a 250 RPM and 1.2PSI.
Is it possible I am staging the injectors to quickly?

newlog.msl


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Matt Cramer
Super MS/Extra'er
Posts: 17499
Joined: Thu Apr 16, 2009 8:08 pm

Re: secondary injectors staging?

Post by Matt Cramer »

It might work better if the line ran through one rail, looped through the second, and then went to the regulator.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
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