Help dialing in AFR - Dodge SRT Forum
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post #1 of 5 (permalink) Old 09-17-2017, 11:06 AM Thread Starter
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Help dialing in AFR

I need a little help dialing in my afr, I'm running rich at WOT
I remember reading there is a specific formula when adding or subtraction fuel at wot on the intune, but can't seem to find it now.

I'm getting a little knock, upto 2.5 (I'm not sure if the rich afr is causing this or my timing) The timing seems to be going down when it starts knocking though?

MODS are as followed

Boomba fuel rail (No return line)
Duster's 1025cc injectors
Duster's 93 octane base re-map
3 bar map and tip
ACT HDSS clutch
AEM Failsafe (Wideband and boost) gauge (failsafe trigger disabled)
Oil catch can and one way check valve
3" O2 housing
3" Needswings downpipe attached to stock 2.5 catback exhaust system

100% Stock
Fuel pump and fuel line system
Intake system with k+n drop in filter


Any help is appreciated, I'm still a newb when it comes to tuning. I know obviously I need to remove fuel but instead of Re-flashing the pcm 20 times to get it dialed in, I'd Prefer to have the formula as to what % to start with on the intune.
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post #2 of 5 (permalink) Old 09-17-2017, 06:59 PM Thread Starter
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Alright, finally found it

" Take your Actual AFR and subtract it from your Desired AFR. Now take that number you get and divide it by your Desired AFR. Take that number and times it by 100. That will give you the percentage you need to add or subtract.

So example. My AFR is 10.5 but I want 11.7. So 10.5 -11.7 = -1.2. Then -1.2/11.7 = -0.103. Now -0.103 X 100 = -10.3. Round that to the nearest 0 or 5 so you would subtract 10.5% from the DSP under the wot fuel modifier. "

I started by removing 5.5 % at 3-4, 5-6, 6-7 and 4.5% 1-2, 2-3 thousand rpm's and I'll update the datalog and see where I'm sitting at. I'm shooting for 11.7-11.5 And I'll backoff the timing when I get my fuel where I want it to try and combat knock.

I know the pid's are missing alot but using the intune + dataviewer to log my wideband is a pain in the ass. Works 1/2 the time, other times all the data in the log is insanely off.
I wish they would fix dataviewer with the intune, but they already have my $$$ .......so I'll probably have to live with it working 1/2 the time and saving a successful log 1/4 of the time.
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post #3 of 5 (permalink) Old 04-12-2018, 08:47 PM
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are your injectors descaled???? That would be another thing to look into for rich AFs

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post #4 of 5 (permalink) Old 04-13-2018, 08:08 AM
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Garage
Thanks for posting that up SC
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post #5 of 5 (permalink) Old 05-14-2018, 06:30 PM
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Did any adjustments work for you?


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