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Individual injector trim?

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Old 09-27-2013, 02:32 PM
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Default Individual injector trim?
It looks like if you run full sequential injection you can manage each injector's fuel trim. Anyone doing this with great success? Just kinda curious.
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Old 09-27-2013, 02:47 PM
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To do it accurately and see gains, you need four widebands.
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Old 09-27-2013, 03:01 PM
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Originally Posted by Savington
To do it accurately and see gains, you need four widebands.
So you think that taking the flow info from Witch Hunter and putting REQFUEL for the average and then trimming each from that would not be worth the time? Too many other variables?

Also, here is another approach... multiple EGT rather than multiple AFR:
Megasquirt-3 MS3 AFR Safety System
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Old 09-27-2013, 03:19 PM
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Originally Posted by Savington
To do it accurately and see gains, you need four widebands.
Really? How would that even work? I mean logistically where would you put four widebands?
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Old 09-27-2013, 03:22 PM
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To do it accurately and see gains, you need four widebands...

...and sequential injection.
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Old 09-27-2013, 03:24 PM
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Plenty of room on Savington's headers.

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Old 09-27-2013, 06:18 PM
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Originally Posted by Harv
Really? How would that even work? I mean logistically where would you put four widebands?
Easy peasy. Reverent actually has exactly that on his miata right now.

I tried to find a pic, but can't find it. I'm sure he can re-post it
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Old 09-27-2013, 10:50 PM
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I get the idea from the nuge's pic, so basically you end up with individual runners on each exhaust cylinder and each one gets a wideband.
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Old 09-28-2013, 03:10 AM
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Strangely enough, I can't find the pic with the widebands on the headers.



Attached Thumbnails Individual injector trim?-dsc00446_1.jpg   Individual injector trim?-p1010295.jpg  
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Old 09-28-2013, 05:16 AM
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Did you see much deviation cylinder to cylinder Rev?
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Old 09-28-2013, 06:41 AM
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0.1-0.2. And guess what, cyl #4 is not the "hottest" (old m.net myth), and there's no direct correlation between EGT temps and AFR, ie the hottest cylinder is not the one that runs the leanest.
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Old 09-28-2013, 07:00 AM
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So where is the data on individual cylinder temp?

And you are talking EGT not coolant right?

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Old 09-28-2013, 07:38 AM
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What data do you want? Yes, EGT, not coolant temps.
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Old 09-28-2013, 07:42 AM
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Originally Posted by Reverant
0.1-0.2. And guess what, cyl #4 is not the "hottest" (old m.net myth), and there's no direct correlation between EGT temps and AFR, ie the hottest cylinder is not the one that runs the leanest.
I thought cyl 4 was only hot on the earlier cars, with the MK2.5, the adjusted headgasket fixed the issue?
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Old 09-28-2013, 07:55 AM
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Me too, and coolant only not EGT, Id have thought egt would have to do with flow in the IM and fuel rail.

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Old 09-28-2013, 08:31 AM
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I just said what the m.net myth was.
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Old 09-28-2013, 08:46 AM
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No turbo for you Reverant? Or is it somewhere down the line?
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Old 09-28-2013, 11:30 AM
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lol @ individal widebands

4 channel EGT

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Old 09-28-2013, 11:49 AM
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okay, Tom.
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Old 09-28-2013, 02:10 PM
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Originally Posted by Reverant
I just said what the m.net myth was.
Yep, basically all the dual feed fuel rail fanbois were saying #4 was starving, etc.
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