F/IC MAF Volt Clamp? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-24-2008, 12:04 PM   #1
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Default F/IC MAF Volt Clamp?

In the setup tab, what volt did you set the MAF clamp to? Im having abit of issues and I think the ECU is trying to override the F/IC. Its a 2004 miata supercharged with a U2 ubercharger.
I have a bucking issue in the 2800-3200 and 4500 rpm range.

If it would help I can post my Base map and Logged data. The data has been coverted to AEMLog.

thanks
Chris
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Old 11-24-2008, 12:16 PM   #2
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i tried attaching them to my post but no luck. If you want to look at them, PM your email addy and ill send them.
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Old 11-25-2008, 08:25 PM   #3
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Sorry man; not many Fic users in this forum. Let's see if someone can answer your questions.
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Old 11-26-2008, 10:42 AM   #4
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Thanks man,
I have become one less user also. I put my voodoo box back in untill I figure out what direction I want to go next.

Chris
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Old 11-26-2008, 01:20 PM   #5
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Quote:
Originally Posted by atomicfrawg View Post
Thanks man,
I have become one less user also. I put my voodoo box back in untill I figure out what direction I want to go next.

Chris
Chris, go with the MS. You won't regret it.
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Old 11-26-2008, 05:23 PM   #6
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I would love to, but I have a 2004. I want to go full stand alone if i go MS, But i know nothing about building it for the 2004. Untill i fully understand the mods i wont touch it. Unless someone offers to build it and do the mods. (i dont see that happening)

Chris
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Old 11-29-2008, 03:46 PM   #7
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Setup_MAF
load input: MAF
mode: percent
max voltage clamp: 4.43

Had to add 13.3% to entire MAF table to compensate for the AEMFIC pulling down the MAF output...

Hope this helps, although it seems the only thing in common with our setups is they are both FI. See my sig.
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Old 12-15-2008, 09:12 PM   #8
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Quote:
Originally Posted by secretsquirrel View Post
Setup_MAF
load input: MAF
mode: percent
max voltage clamp: 4.43

Had to add 13.3% to entire MAF table to compensate for the AEMFIC pulling down the MAF output...

Hope this helps, although it seems the only thing in common with our setups is they are both FI. See my sig.
That about where I had everything set at. But I think I was running the MAF clamp at 4.5. I also had MAF table at 14%.
I had tons of bucking at 2800 RPM and 4500 RPM. I was logging AFR data and INJ duty cycle. At those 2 RPM points AFR and INJ duty went nuts.
I just pulled all of it out and put the FM voodoo back in.
The car just was totaled so I wont have a chance to find out why this was happening.


Chris L
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Old 04-02-2009, 07:38 PM   #9
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Hmmmm.... I just purchased an AEM from RIPRACER, setup for a 2003. Im currently looking over the maps and they are set at 4.5 and 14.1%.

The unit will be installed hopefully before the weekend.... I will say that I had this same issue with my Xede. Im really thinking that it is an O2 clamp issue.

The AEM has and option to send out a fake 14.1 o2 signal. Maybe turn that on and see if the car is pulling fuel on you.

Once it is installed I will be able to help more, that is if I have the same problem.


Are any of you controlling the VVT with the AEM... I would strongly suggest letting the factory ecu control it as Dynos have proven as long as it changes some where in the 3K range you will not see and performance gains or losses. So it really is pointless to mess with it as the factory setting is pretty good.
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Old 04-06-2009, 07:46 PM   #10
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Still not installed, I have my PNP wire harness but no time to play with checking the tune on the car.

After looking into the tune of the previous owner on this AEM FIC my head exploded............

I have no idea what the hell its doing, I will probably start my own tune, with the v3 firmware installed



if you have 550cc injectors what is your injector map pulling at idle... from my calculations it should be 50% while out of boost, to put it in the stock range? Right?
so why is this tune only pulling -16%

I hope we get more FIC guy in the forums soon.
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Old 04-07-2009, 12:49 AM   #11
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The F/iC is really quite simple to set up. I used mine to delete the MAF in my 1990, and to run 440cc injectors. Worked great.
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Old 04-07-2009, 12:01 PM   #12
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Do you have your cal file, I would love to see how much fuel you are pulling for the 440cc injectors...

I really dont understand the cal file on mine, but I have yet to plug it in and see what it does.

Also you mention adding 14% to the MAF map to make up for the pull down resistor, but if i upgrade to V3.0 I no longer have this map, so what then?
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Old 04-07-2009, 04:32 PM   #13
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Just a few explanations about my previous post...

Quote by Mikeymx5:
"Also you mention adding 14% to the MAF map to make up for the pull down resistor..."

You kind of misunderstood what I was trying to say there...

Quote by secretsquirrel:
"Had to add 13.3% to entire MAF table to compensate for the AEMFIC pulling down the MAF output..."

Having the AEMFIC on such a sensitive signal line needs to be compensated for EXACTLY on the MAF table to get your idle right - remember that in closed-loop the ECU will be trying to adjust idle afr from the stock O2 sensor signal - this is a "code-thrower" if not correct (there is a large difference between 13.3 and 14 percent when it comes to MAF signal). 13.3% was just the number that brought my MAF to "pre-tapped" level.

Quote by Mikeymx5:
"if you have 550cc injectors what is your injector map pulling at idle... from my calculations it should be 50% while out of boost, to put it in the stock range? Right?"

Pretty close - I'm at -46.1% "across the board" for anything out of boost with 550cc (the ECU is still dealing with fuel at this point). The exact percent will be unique to the car & mods.

Quote by Mikeymx5:
"The AEM has and option to send out a fake 14.1 o2 signal. Maybe turn that on and see if the car is pulling fuel on you."

How I handled "lean tip in" was to offset the O2 voltage on the O2 map by -0.281v at boost onset and higher. This is without a resistor on the O2 tap line.


I figured out all these settings by using a VERY good scan tool (Dyno-Scan) to see and write down all the important signal voltages and patterns - before I installed the AEMFIC. This was to know exactly what the ECU was seeing in normal operation prior to installing something that was going to intercept and/or modify all the important engine sensors. This is the key to keeping the ECU happy and not throwing codes (and also that I wired everything correctly - there is no wiring diagram for the 99-00). I've been very happy with the AEMFIC especially since my main goal was too pass OBDII with no hassles. At present, I have a pretty strong "street tune" but have yet to make it to the dyno - I know there is some HP in my ignition map!

Last edited by secretsquirrel; 04-07-2009 at 04:49 PM. Reason: Clarification...did not make sense to the guy who wrote it, me!
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Old 04-07-2009, 04:49 PM   #14
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Thank you.

I purchased a used FIC that was suppost to be tuned for my car and my setup, but havent installed it simply because I do not like what i am seeing in the Cal file.

In fact at the "0" line on the table the injectors were adding 6%.

By the MAF set at 14.1% for a pull down I just ment the same thing just used the wrong words, did nt mean to confuse.... but im still wondering what to do on the version 3 firmware that doesnt have this in the cal file.

Dont mean to hijack the thread but can you send me your cal file, even with you having an 99-00 I think that yours would be a better ball park map to start tuning off of.

Also anyone know how to connect the LC1 and keep the factory 02 in the +021 connection. I assume that I will just wire it in the +022 location am I right?
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Old 04-08-2009, 12:10 AM   #15
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Unfortunately I already have the turbo and the xede installed. I figure that i will do most of my tuning just like I did the xede by holding the car in closed loop and watching the fuel trims, and adjusting until they reach 0.

I want to completely remove any MAF tuning, other than adjusting for the voltage drop of the MAF and the AEM. Later I might try to simulate the MAF but not until I have a good tune. I dont like MAF tuning because you have know Idea what you are doing to the factory ECU, some times with the xede I had to add fuel to remove it, that really is annoying, with injector duty I can see it and adjust it on the fly, much better.
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Old 04-08-2009, 11:42 AM   #16
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PM me an email and I'll send my current cal (my postcount is will not allow me to PM you). Note: I am still running ver. 2 of software/firmware...
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Old 04-08-2009, 12:59 PM   #17
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Thanks Secret squirrel. I will probably take the car out this weekend for a street tune.Your maps are much much better, I have a hard time believing that the one that came with the FIC would even work "."

[img=http://img27.imageshack.us/img27/3808/gfuelmap.th.gif]
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Old 04-08-2009, 02:03 PM   #18
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I'd say if the fuel map looks like that, there is surely something wrong with the MAF circuit, MAF map, tuner, etc. Can you email me back your original cal file - I'm very curious if there are conflicts between maps, i.e. add fuel on the FUEL map & take away fuel on the MAF map...
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Old 04-08-2009, 02:42 PM   #19
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Ill send it out... the MAF map"S" are pretty straight forward, one has 14.1 in all cells... this sounds about right, the second starts at 0 and gradually moves to 4.7 in the opposite corner. There is no correlation between the two maps that I have found. Not to mention that you should never have a large jump from cell to cell, it leads to very unsmooth acceleration.

Hey I just found the missing second MAF map in the V3 software, why are there two of these maps? is there a purpose? Seems very redundant.

Boy sorry I really have stolen this thread, but there don't seem to be many FIC guys here.
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Old 04-09-2009, 12:06 PM   #20
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Quote:
Originally Posted by atomicfrawg View Post
In the setup tab, what volt did you set the MAF clamp to? Im having abit of issues and I think the ECU is trying to override the F/IC. Its a 2004 miata supercharged with a U2 ubercharger.
I have a bucking issue in the 2800-3200 and 4500 rpm range.

If it would help I can post my Base map and Logged data. The data has been coverted to AEMLog.

thanks
Chris
Got this installed last night, and I have the exact same issue? Set the 02 map to 0, MAF map to 14.1% all cells (the car wasnt happy with 13%) Fuel is at -41%. At idle the car started beautifully!!! But if I increase the RPMs slowly at around 3K the car will buck.

Im only working out of boost at the moment.
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