Re: Super duper MPG 6.4 help!
[Re: HotRodDave]
#2940962
07/07/21 08:58 PM
07/07/21 08:58 PM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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this is the 1st one , need the icl for the 2nd one
Last edited by csk; 07/07/21 08:59 PM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Super duper MPG 6.4 help!
[Re: HotRodDave]
#2941962
07/11/21 07:26 AM
07/11/21 07:26 AM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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I don't know if anyone is reading these or not butt I did get lean on both banks codes but the trim ! You have at least one reader. Bank to bank trim is an improvement but I wish there was a way to dial it in cylinder by cylinder, especially at highway cruise part throttle. You changed 8 injector to get “in the ballpark.” It would be good for MPG to give each cylinder the capacity injector it needs. Having used an un-lit propane torch to find vacuum leaks, I have wondered in the past whether adding a cheap flow gauge on a propane bottle, then tapping a small test port into each runner to add a measured stream of extra fuel when at highway cruise would allow finding rich or lean cylinders. Keep increasing propane flow until that bank’s Oxygen sensor registers a change. Having a threaded test port on a individual runner also makes in possible to screw in a “ Flow restricter” to do the opposite: reduce airflow a bit to balance AFR in each cylinder. Getting each cylinder near to 14.7 AFR would help MPG, but taking all cylinders to 21 AFR would improve MPG even more. Remember at +20 AFR tendency to ping or detonate goes WAY DOWN, just like running AFR below 10 suppresses pinging.
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Re: Super duper MPG 6.4 help!
[Re: HotRodDave]
#2941999
07/11/21 11:23 AM
07/11/21 11:23 AM
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Joined: Jan 2003
Posts: 554 Mesa , Az
Jambbii
mopar
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mopar
Joined: Jan 2003
Posts: 554
Mesa , Az
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I don't know if anyone is reading these or not butt I did get lean on both banks codes but the trim was very close on both sides so I put in a set or 392SRT8 injectors and that brought the trim numbers down a ton and made it even more responsive, it will flat go sideways with the 8 foot bed full of firewood! I'm reading your post, I just don't know what to make of them. I do enjoy the information. What do you use to tune everything? I do have custom tune on my 12 durango but I feel like it could use some help.
70 Challenger 1960 Town Wagon P Pump 24v cummins project 06 Mega 3500 Drw 2wd 12 Durango R/T 18 Power Wagon 67 A100
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Re: Super duper MPG 6.4 help!
[Re: 360view]
#2942157
07/11/21 08:55 PM
07/11/21 08:55 PM
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Joined: Mar 2010
Posts: 1,061 Atlanta, GA
mgoblue9798
super stock
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super stock
Joined: Mar 2010
Posts: 1,061
Atlanta, GA
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I don't know if anyone is reading these or not butt I did get lean on both banks codes but the trim ! You have at least one reader. Bank to bank trim is an improvement but I wish there was a way to dial it in cylinder by cylinder, especially at highway cruise part throttle. You changed 8 injector to get “in the ballpark.” It would be good for MPG to give each cylinder the capacity injector it needs. Having used an un-lit propane torch to find vacuum leaks, I have wondered in the past whether adding a cheap flow gauge on a propane bottle, then tapping a small test port into each runner to add a measured stream of extra fuel when at highway cruise would allow finding rich or lean cylinders. Keep increasing propane flow until that bank’s Oxygen sensor registers a change. Having a threaded test port on a individual runner also makes in possible to screw in a “ Flow restricter” to do the opposite: reduce airflow a bit to balance AFR in each cylinder. Getting each cylinder near to 14.7 AFR would help MPG, but taking all cylinders to 21 AFR would improve MPG even more. Remember at +20 AFR tendency to ping or detonate goes WAY DOWN, just like running AFR below 10 suppresses pinging. If you are running headers, you could use a temp sensor gun to identify lean cylinders. Lean ones would be hotter. Could also weld bungs into each tube to test with wideband AFR gauge set up.
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Re: Super duper MPG 6.4 help!
[Re: HotRodDave]
#2982255
11/06/21 12:18 AM
11/06/21 12:18 AM
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Joined: Aug 2013
Posts: 106 Central IL
Trojmn
member
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member
Joined: Aug 2013
Posts: 106
Central IL
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It never pings audibly or on the knock sensors in the data stream What computer are you running? What tuning if any? That reads like possibly something is at least logging data?
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Re: Super duper MPG 6.4 help!
[Re: HotRodDave]
#2982865
11/07/21 06:48 PM
11/07/21 06:48 PM
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Joined: Aug 2013
Posts: 106 Central IL
Trojmn
member
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member
Joined: Aug 2013
Posts: 106
Central IL
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If you dont have one/two already, I'd get at least one wide-band. I've used Innovate motorsports programmable* LC1 before to replace upstream narrow band sensors and also data log. What this will help even without ECM tuning is determining exactly where open loop is AND because its a heavy truck, where COT (catalytic over temp) is. If you have access to tuning software you can find out your target AFR... hint it almost certainly is not 14.7:1. In 2003-2009(?) NGC computers it is something like ~14.4. Moving that up will increase MPG, note the LC1 can do that even if you cannot tune the PCM.
Its been a few years, I have *no idea* about 6000lb truck tuning but the scheme on about every vehicle under heavy load that i had a wide-band in will eventually start dumping fuel to cool off the cat and keep it from melting. I don't know what wizardy they do with your gen computer these days but I'd imagine a heavy truck gets into openloop quite often and when towing probably can get into COT often. You can see this on a large hill with a wide-band 02 sensor output where your cruising at part throttle closed loop at the target AFR, then as throttle increases (TPS v) the computer will switch to open loop tables and there will be a noticeable drop down to 12-13AFR for a period of time. With enough load for long enough and then BAM suddenly drop AFR to 10:1 or richer (COT) until you let off the enough on the throttle. Knowing those points that can get you a couple MPG just by changing your foot habits. I suspect you are getting into open loop a bunch and thats were the tune will help.
Last edited by Trojmn; 11/07/21 06:49 PM.
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