Is their a right and wrong PI controller?

pysical

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Jun 16, 2017
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Does a AIC4 modified for 6 injectors work as good as a AIC6? I bought a PI controller but its a AIC4 that has been cut to work for 6 injectors. Should I sell it and get the AIC6?
 
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pysical

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Jun 16, 2017
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Yes you should. It wont work right. Just ask George at split second tuning, he makes the AIC boxes

What is the difference in the two boxes? I bought it from E90post and I didn't ask about it because I didn't know people took an older version, cut it up and added two more injector harnesses. I thought when people referenced the "SS", "AIC", or "PI controller" they were talking about the AIC6.
 

Erichale77

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Nov 14, 2016
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The AIC is made by split second and if you have the AIC4 it is meant for a 4cyl. by splicing in more wires for a 6 or 8cyl the electrical board in the controller doesnt know this and its programming is only for 4 cyls. Therfore it wont fire the injectors when they need to be fired.
 

veer90

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Nov 16, 2016
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From what I understand they make the AIC (additional injector controller) box in a variety of configurations. Yes you can modify one to fire 6 injectors but most of the vendors sell modified AIC1's. Never heard of a modified AIC4
 

pysical

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Jun 16, 2017
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My brother called Split Sec and asked them. They said this is all they sell. And I guess if you were to purchase the AIC6 from MMP, this is what you would get.
 

veer90

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Nov 16, 2016
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My brother called Split Sec and asked them. They said this is all they sell. And I guess if you were to purchase the AIC6 from MMP, this is what you would get.

Got mine from MMP, the box was labeled AIC1 but it had a harness for 6 injectors.
 

veer90

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pysical

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Jun 16, 2017
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The box is the same but mine is flash only so the harness is different. I had the main harness and a smaller harness with 4 wires: red, black, yellow, green.

That one looks like it's wired for JB4. The main harness with the 6 injector clips should be the same.

Well the one I have is like that. But it has the red, black, and a yellow/black wire coming out of the box. I just thought it was weird that a company would sell a controller that has 2 injectors spliced into like that.

Also, the guy I bought it from said he bought it because he was flash only. But his tuner didn't want to use that one so he had to get another just for JB4.
 

Vitan

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Nov 20, 2016
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Alpina b3s ST, Cls55 amg
Don't worry, your controller is right. PI at N54 is very "simple" it batch fire 2x per stroke, to all cylinders. So controller only for 1cylinder engine is enough.
 
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pysical

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Jun 16, 2017
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2009 335xi E90
From what I understand they make the AIC (additional injector controller) box in a variety of configurations. Yes you can modify one to fire 6 injectors but most of the vendors sell modified AIC1's. Never heard of a modified AIC4

Hey, I got a reply from Split Sec. I think people are calling these boxes different names. They are all a AIC1. But the two that are getting me mixed up are AIC1-x4H and the AIC1-V6H/EV6. This is what Split Sec sent me in a email..

"An AIC1-x4H is not intended to drive two injectors in parallel. We don’t recommend that configuration. It should be used to drive up a maximum of 4 injectors.

The AIC1-V6H/EV6 which we make with a harness for in-line 6-cylinder engines, is specifically designed to drive 6 injectors."

I guess I am gonna have to go with this isn't the best way to do this, but it will work.
 
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Erichale77

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Nov 14, 2016
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That's what i was trying to tell you. Went thru that problem years ago which is what led split second to make specific 6cyl controllers for Terry at BMS. Now he has his own upgraded version with better safety measures. The AIC is no longer supported.
 

[email protected]

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Nov 5, 2016
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People telling you this won't work do not understand what is happening when the PI is firing. Is it ideal, not really, will it work, yes. Its simply firing a batch. BOOM it fires all 6 cylinders at the same time, or 1, or 2, or 4, or 8, or 12. We have used the AIC6 on 4 cylinders, just leaving 2 plugs unplugged, and we have seen people run the 4's on 6's, by adding a couple of plugs. I do not prefer to add plugs, but if you already have it, and its modified it will work fine. The controller literally has no idea how many injectors it's firing, it's just lighting them all off in a batch. That's why it's referred to as batch fire...
 
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Vitan

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Nov 20, 2016
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People telling you this won't work do not understand what is happening when the PI is firing. Is it ideal, not really, will it work, yes. Its simply firing a batch. BOOM it fires all 6 cylinders at the same time, or 1, or 2, or 4, or 8, or 12. We have used the AIC6 on 4 cylinders, just leaving 2 plugs unplugged, and we have seen people run the 4's on 6's, by adding a couple of plugs. I do not prefer to add plugs, but if you already have it, and its modified it will work fine. The controller literally has no idea how many injectors it's firing, it's just lighting them all off in a batch. That's why it's referred to as batch fire...

+1 exactly
 

V8bait

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Nov 2, 2016
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People telling you this won't work do not understand what is happening when the PI is firing. Is it ideal, not really, will it work, yes. Its simply firing a batch. BOOM it fires all 6 cylinders at the same time, or 1, or 2, or 4, or 8, or 12. We have used the AIC6 on 4 cylinders, just leaving 2 plugs unplugged, and we have seen people run the 4's on 6's, by adding a couple of plugs. I do not prefer to add plugs, but if you already have it, and its modified it will work fine. The controller literally has no idea how many injectors it's firing, it's just lighting them all off in a batch. That's why it's referred to as batch fire...

+1. You'd only get in trouble if you're running low impedance injectors in parallel.
 

Vitan

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Nov 20, 2016
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Pilsen, Czech Republic
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Alpina b3s ST, Cls55 amg
Try this odpor.jpeg