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Home Brew People - Need some help with Tuning - Part 2

   
Old 07-31-2008, 06:02 PM
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Default Home Brew People - Need some help with Tuning - Part 2
Guys I have been helping my buddy tune his car.

Here is his setup:
Green Giant @ 4 bar = 520cc/50#
83mm MAF w/ Hitachi sensor
Giac X
Lem: 24% pulled primary fuel

Pink is with a Spike to 20psi - 18.5psi at reline.

What can we do about it running rich?




<center>
After about 70 miles of driving:
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/block32.jpg" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image219.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image220.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image221.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image222.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image223.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image239.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image240.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
</center>
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Old 07-31-2008, 06:04 PM
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Default I'm no HB specialist but those LTFT's look pretty good to me. I've seen plenty of OTS kits...
that don't look that good.

Timing looks pretty bad to me though- thats a lot of timing retard.

Hopefully Jordan can chime in here.
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Old 07-31-2008, 06:22 PM
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thats not rich. if anything you are a bit lean during peak torque
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Old 07-31-2008, 06:31 PM
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Default Let's see boost, fuel injector duty cycle, and engine load. Try turning up boost ~2 PSI and see how
everything is affected before making further changes IMO. This is assuming that you aren't at high elevation where more boost wouldn't be as safe.

The shape of the fueling curve stinks, curious how more load will affect it.
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Old 07-31-2008, 06:34 PM
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Depends entirely on octane IMO. You're too used to **** water.
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Old 07-31-2008, 07:07 PM
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Default Here is what we got. I can have him add 2 psi and see how she does.
<center>
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image242.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image244.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image254.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image255.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
<img src="http://i230.photobucket.com/albums/ee211/MySTG3S4/20-18psi/image256.gif" alt="Photobucket - Video and Image Hosting">&lt;br&gt;&lt;br&gt;
</center>
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Old 07-31-2008, 07:09 PM
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Default I know the 02 is a result of MAF g/s and other "stuff" and that he should be a bit richer.
he is on 91 oct.

But why isn't the 02 reading not flat but climbing?
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Old 07-31-2008, 07:12 PM
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Default welcome to HB
nothing you can do about that. you really have no control over that slope.
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Old 07-31-2008, 07:14 PM
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Oooh, 91 octane explains CFs/timing ... And AFR desired curve explains fuel enrichment with RPM.
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Old 07-31-2008, 07:18 PM
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Default I didn't realize you were on 91 oct when I said that. I figured that is important enough it would be
mentioned. Hmm, I say still try it...but you may find that you need to add fuel and/or pull timing with Lemmi to get things right.
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