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Running out of fuel?

B

blackgrandprix

New member
Hi i have a 07 gt with headers 3" down pipe, cai, 3.4 pully, sx1 cam with 105 springs, retainers and yella terra rockers, push rods and oe-r lifters with overkill pcm. At about 4800 rpm i get about 136% injector duty and start seeing about 5* of kr im new with hp tuners and was wondering what i can look for with it to see if im running out a fuel. I know a wide ban would be best but is there other things i can be looking at for now to see if this is true any help would be great thanks.
 


Get a Wideband.

YOu need to know what kind of AFR you are dealing with in order to determine how much fuel to give it or not give it.

AS of right now you are WAY maxing out your injectors which I assume are still stock. Without know AFR at your mod level you are just guessing.
 
You can look at your bank 1 O2 in millivolts. At WOT you should be in the 920-940 range. While it's not a great sensor..it'll give you a general idea.
 
Bill has the right idea- its a ballpark figure and while not a precision instrument it will provide some level of indication while in open loop (Wot)
 


And ...you have an indication then.
Heck.. we love to say get a wideband, but admittedly after reading up on them, checking instructions etc. You can easily skew a wideband reading nearly as well as the narrow band.
 
Well i just checked some of my scans and im sitting at about 915-940 mv so im in the ball park so i don't think i need injectors. was hoping i was running out of fuel but looks like every thing is good just really disappointed in the whole cam set up and how the car runs.
 


txslow6 said:
What is your IDC?
Click to expand...
most i have seen is 146 but always wot above 4800-5000 rpm i hit 100% and keeps going up
And when i look at the histogram in hp tuners when i hit max values it says im around 430-460 but the table says 920mv ....? injector pules width for both banks is 22.5 at 4800 rpm and 23 at 6000 rpm and 6400 rmp about 24.7
 
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