maf calibration

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mustangman1992
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maf calibration

Postby mustangman1992 » Sat Sep 02, 2017 3:24 pm

hello i have a 2004 crown vic on wich i have installed a 75mm turbo with 3" intercooler piping. the problem i am having is with the maf, no matter wich calibration i pick it runs terribly. i currently have the stock crown vic maf installed into the intercooler piping. it idles ok but when i hit the gas it blows black smoke and pegs the wideband at 10.00 . i have 80lb injectors and a 255lph pump wich i selected in the special forces software. the car runs best with the maf disconnected. any help would be greatly appreciated, thanks in advancw!! -Tom

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Sniper Chris
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Re: maf calibration

Postby Sniper Chris » Tue Sep 05, 2017 11:07 am

The problem is that you put the crown vic maf sensor into a larger diameter pipe. That sensor is calibrated from the factory for a specific size pipe and since you changed that it will not run correctly. Unless you have the Commando tuning software then I would advise getting a MAF that's supported with the Special Forces software. The Lightning 90mm is very popular since it can handle a lot of horsepower.
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mustangman1992
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Re: maf calibration

Postby mustangman1992 » Sun Oct 01, 2017 11:34 am

Okay. I bought a 90mm lightning meter and have it installed in draw through setup. It seems to run pretty okay sometimes. But whenever I power brake it or step into the gas hard the afr's get pegged at 10 and then black smoke starts coming out. Then it sometimes stalls, it will then run like crap for a few minutes. Even if I shut the car off and restart it it still runs like crap with the afr's in the tens for a minute or so.... Any advice would be greatly appreciated.

- Tom

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Re: maf calibration

Postby Sniper Chris » Mon Oct 02, 2017 1:15 pm

With such big injectors I'm sure the performance tune is going to need some tweaking. Unfortunately, Special Forces doesn't give you full control. You would need the Commando software for that. However, have you done any of the fine tune adjustments in the Special Forces software?
If not, try.....
+2 for the low rpm fuel modifier
.9 for Global fuel modifier PT
.9 for Global fuel modifier FT
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mustangman1992
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Re: maf calibration

Postby mustangman1992 » Mon Oct 02, 2017 1:46 pm

I will give it a shot when I get home soon. Since I haven't 90 mm lightning meter, and 80lb injectors, I just select those from the pull-down menus? Little confused by the instructions in the paper manual.

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Re: maf calibration

Postby mustangman1992 » Mon Oct 02, 2017 5:31 pm

I gave it a shot and no dice.... also worth noting, runs much better with the meter disconnected...

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Re: maf calibration

Postby mustangman1992 » Tue Oct 03, 2017 3:51 pm

Anyone?

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Re: maf calibration

Postby Sniper Chris » Wed Oct 04, 2017 10:39 am

Yes, you would select 80 (72 or 83) for the injector size and 90mm Lightning.

Just to confirm, the 90mm Lightning MAF you're using is still in the Lightning housing? You didn't remove the sensor from the Lightning housing and install into the intercooler piping?

Are you sure the meter is good? If it runs better with it disconnected then it brings up the possibility that the MAF could be bad.
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mustangman1992
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Re: maf calibration

Postby mustangman1992 » Wed Oct 04, 2017 11:36 am

Yes the 90mm lightning meter I have is still in the original tube that it came in. I also have a set up in a draw through before the turbo. Last night just for s**** and giggles I changed the MAF setting to stock, the car ran 100 times better! Still not quite perfect but... so I'm not quite sure what that means exactly.

So with the meter set to stock, one of the main driveability issues that's always been there is the afrs go dead rich right when you take your foot off the gas for about 10 seconds sometimes causing stalling. Then the rebound to normal after 10 or 15 seconds. Even shutting off the car and restarting doesn't seem to help. Any ideas?

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Re: maf calibration

Postby Sniper Chris » Thu Oct 05, 2017 10:16 am

That is pretty strange. Are you sure the injectors are 80 lb/hr?
In the software, did you select the 72 or 83 injector size? Have you tried both (make a difference)?
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Re: maf calibration

Postby mustangman1992 » Thu Oct 05, 2017 11:03 am

I have them set is 83 right now... I have not tried any of the smaller options yet.

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Re: maf calibration

Postby mustangman1992 » Thu Oct 05, 2017 11:04 am

Well at least I was told they were 80lb Siemens Deka injectors.

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Re: maf calibration

Postby mustangman1992 » Thu Oct 05, 2017 8:42 pm

I went and played around with the car a little bit tonight, I threw on the scanner and looked at live data, the fuel pressure at idle was 69 PSI?? Does this tuning software affect fuel pressure?

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Sniper Chris
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Re: maf calibration

Postby Sniper Chris » Fri Oct 06, 2017 10:10 am

That's very high pressure. The software should not effect fuel pressure at all.
If you want, you can email me the tune that you created and I can take a look at it. I can check to see if anything looks unusual or not right. If you want to send it, send to: snipertuned@yahoo.com. Be sure to include a note referencing this conversation.
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