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Old 03-16-2011, 03:48 PM   #11
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Re: Cleo has become an MPG project

She is actually efi but what I was getting at is I know how extremely lean conditions feel. The paint can remark was a comment about the pistons they are huge.
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Old 03-16-2011, 05:55 PM   #12
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Re: Cleo has become an MPG project

Just today short sample 34.5 mpg for the last 20 miles
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Old 03-16-2011, 09:51 PM   #13
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Re: Cleo has become an MPG project

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Originally Posted by philip1 View Post
She is actually efi but what I was getting at is I know how extremely lean conditions feel. The paint can remark was a comment about the pistons they are huge.
Oops
Sorry I thought you were running a carb.

Then I would go with your original plan and start taking away fuel until you notice a slight misfire then add some fuel back to get it to run smooth as you said.
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Old 03-17-2011, 05:17 PM   #14
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Re: Cleo has become an MPG project

I think I have a lot of ignition I can add too, if needed.
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Old 03-19-2011, 06:12 PM   #15
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Re: Cleo has become an MPG project

I've written a tune with fuel pulse widths reduced by 5ms in the 1400-3200rpm and 18-48% load range and ignition advanced 3 deg there too. I'll test it out tomorrow.
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Old 03-20-2011, 03:20 PM   #16
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Re: Cleo has become an MPG project

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I've written a tune with fuel pulse widths reduced by 5ms in the 1400-3200rpm and 18-48% load range and ignition advanced 3 deg there too. I'll test it out tomorrow.
"5 ms"? Is that right? Maybe I'm used to the injector time scale on my car, but that sounds like a lot. Are you sure the units aren't Us?
ms= millisecond=0.001 second
Us= microsecond = 0.000,001 second
What's the stock injector pulsewidth in the load/rpm range where you plan to make those changes?
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Old 03-20-2011, 03:39 PM   #17
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Re: Cleo has become an MPG project

Tbh I have no idea what units they are using but I reduced the number by 5
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Old 03-20-2011, 04:37 PM   #18
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Re: Cleo has become an MPG project

Here are screen shots of the maps the first is the stock map with the affected area highlighted I haves also highlighted the altered map.


stock map




Altered map



Hmmm looks like I went 7 instead of 5 oh well.
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Old 03-20-2011, 11:43 PM   #19
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Re: Cleo has become an MPG project

Ah, I see. In that case I'd simplify and convert into %. For example, 117-7=110.
117/110=6% change.
Assuming the stock map is aiming for stoich 14.7 AF ratio, removing 6% should put it around 15.6 AF ratio.
math;
14.7 parts air mixed with 1 part fuel =14.7:1
14.7 parts air mixed with .94 parts fuel =15.6:1 from removing 6% fuel.
14.7/.90 = 16.3 AF ratio from removing 10% fuel.
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Old 03-21-2011, 07:30 AM   #20
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Re: Cleo has become an MPG project

Looks like a raw number scale.

So what DRW did should give you how much fuel you've taken away.
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