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Author Topic: a couple Crome tuning questions  (Read 9481 times)

Joseph Davis

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Re: a couple Crome tuning questions
« Reply #30 on: April 19, 2010, 10:41:20 PM »

Scale map to your injectors, and mess with the offset box in the fuel multiplier until you get the car to idle at whatever you want it to idle at. Then go mess with the battery offset table.

I know this is an old post, but are we talking about the "stock" or "advanced" battery offset table here? I'm having the same issue where it leans way out when I put a load on the alt. My afr's are perfect at idle and 13.9 volts, when I start turning shit on my voltage drops to about 13.2 volts and it goes 17:1.

I've not used Crome in years and don't know off the top of my head, but I'd have figured that out in ten minutes worth of fooling around.  So can you.


Also, I notice that at idle sometimes my afr's are right on the money but they still fluctuate btween say 14.5-15.3:1 or so, also the vacuum and rpm fluctuate but just barely like 50-100rpm but enough to switch cel's and change the afr's. How do I smooth out the afr's and idle?

Try tuning the cell's the idle fluctuates to and around.  Hint: You are never running off of the value of the cell that's highlighted, it's somewhere between that cell and the adjacent one(s).  The highlighted cell is just the one it's closest to.

ifly87

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Re: a couple Crome tuning questions
« Reply #31 on: April 20, 2010, 03:12:54 AM »

I've not used Crome in years and don't know off the top of my head, but I'd have figured that out in ten minutes worth of fooling around.  So can you.
I have changed the values in the "stock" injector battery offset tables and havent really noticed much if any difference in bringing the afr's back down, and the "advance" table kinda scare's me since all the values in it currently are 0. So I'm not sure what I would even start changing values too in that table, can the battery injector offset "advance" table have negative numbers in it?

Try tuning the cell's the idle fluctuates to and around.  Hint: You are never running off of the value of the cell that's highlighted, it's somewhere between that cell and the adjacent one(s).  The highlighted cell is just the one it's closest to.
That hint if correct is a good one, thanks. I always assumed it was reading the value in the highlighted cell.

After a few hours of tuning I've got my afr's to stay pretty stable so I get excited. Then the next time I turn the car on my afr's would be all different, especially at light load its quite frustrating.

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Joseph Davis

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Re: a couple Crome tuning questions
« Reply #32 on: April 20, 2010, 08:47:22 AM »

Sounds like shit doesn't work.

lilpooh21186

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Re: a couple Crome tuning questions
« Reply #33 on: April 20, 2010, 09:56:43 PM »

i use to have the problem then i relized tune everything on day and time mark down your last ait baro and ect  along with injector puls with the next day see if these values are the same if not just ajust your corrections.
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