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View Full Version : A/F tweak vs auto tune


minytrker
February 17th, 2006, 05:26 PM
My car runs really well driving around but its a little rich at wot still. My a/f is 12.72 with 26 for timing with no kr. Would I do better just trying to adjust from 3500rpm till 6500rpm at wot or should I do the auto tune. I just had my car on the dyno and it below normal. Would the 12.72 being holding back some power? I made 377rwhp/371rwtq where the norm is 385-395rwhp.
minytrker
February 17th, 2006, 07:31 PM
Can I still use auto tune if I don't have stock fuel or timing tables?
Black02SS
February 17th, 2006, 09:52 PM
Yes you can do both. It is up to you but if it was me I would do the autotune to make sure it is all correct.
minytrker
February 18th, 2006, 06:23 AM
I don't have my stock fuel or timing maps, I had them tweaked last year before I had efi live, so its ok to start autotune with a non stock ve table?
BowlingSS
February 18th, 2006, 06:43 AM
I don't have my stock fuel or timing maps, I had them tweaked last year before I had efi live, so its ok to start autotune with a non stock ve table?

Sure no problem.:exactly: Do you have a WB?:coool:

Bill
minytrker
February 18th, 2006, 06:46 AM
Yes, I have a wideband installed. Will autotune fix being rich at wot?
BowlingSS
February 18th, 2006, 06:51 AM
Yes, I have a wideband installed. Will autotune fix being rich at wot?

The autotune will get your VE table right. If you have stock OS your PE Table will need to be changed after your autotune. PE Table controls WOT.

Bill
:beer:
minytrker
February 18th, 2006, 10:17 AM
I use the PE ModifierBased on RPM right? If thats right, whats the formula for figuring out how much to change that number to change the A/F. Right now from 3200rpm on up its .86.
BowlingSS
February 19th, 2006, 05:25 AM
I use the PE ModifierBased on RPM right? If thats right, whats the formula for figuring out how much to change that number to change the A/F. Right now from 3200rpm on up its .86.

That is the right table.
From EFILive Help:
The air-fuel ratio (AFR) considered to be stoichiometric.
This value is used by the PCM to determine the AFR of EQ ratio 1.0.
AFR values for EQ ratios are calculated by dividing this value by the specified EQ ratio.

So .86 should give you an AFR of about 12.6. What AFR are you shooting for?

Bill
:rockon:
MN C5
February 19th, 2006, 06:30 AM
I use the PE ModifierBased on RPM right? If thats right, whats the formula for figuring out how much to change that number to change the A/F. Right now from 3200rpm on up its .86.

You need to disable PE if your doing auto tune.. Once the VE table is dialed in then fire it back up.

Just make sure your VE table is on the rich side and then start leaning things out with auto tune
minytrker
February 19th, 2006, 09:31 AM
That is the right table.
From EFILive Help:
The air-fuel ratio (AFR) considered to be stoichiometric.
This value is used by the PCM to determine the AFR of EQ ratio 1.0.
AFR values for EQ ratios are calculated by dividing this value by the specified EQ ratio.

So .86 should give you an AFR of about 12.6. What AFR are you shooting for?

Bill
:rockon:


Im at 12.7 right now. I am trying to get to 12.9 or 13.0 if thats not to lean. I just added 2 deg of timing to see if that would help. How does .86 = 12.6? How did you calculate that?
BowlingSS
February 19th, 2006, 09:35 AM
Im at 12.7 right now. I am trying to get to 12.9 or 13.0 if thats not to lean. I just added 2 deg of timing to see if that would help. How does .86 = 12.6? How did you calculate that?

14.63 * .86= 12.5818

Try .88 * 14.63= 12.87

Bill
:notacrook:
minytrker
February 19th, 2006, 10:06 AM
:coool: I feel dumb now, that was to easy. I was thinking of something really hard to calculate.