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Old 02-10-2010, 05:51 PM   #231
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Scrapping out my tune and starting over from scratch. Wow, was I off with this new setup. All numbers in the upper left histogram are to be between -5 and +5

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Will finish this up next week.
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Old 02-10-2010, 08:47 PM   #232
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Manifold pressure is the starting point?

You changed airflow significantly. It'* VE time.
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Old 02-10-2010, 08:52 PM   #233
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Quote:
Originally Posted by BillBoost37 View Post
Manifold pressure is the starting point?

You changed airflow significantly. It'* VE time.
X2...pack a lunch and go for a drive Dan!
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Old 02-11-2010, 12:32 AM   #234
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That scan was my first VE run. As you can see, it was off a lot.
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Old 02-11-2010, 07:32 AM   #235
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That'* manifold pressure, not LTFT'*... ???
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Old 02-11-2010, 08:03 AM   #236
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Top label Bill, VE, Long Term Fuel Trims
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Old 02-11-2010, 09:45 AM   #237
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I had to lean toward the laptop for the part I saw. LOL
Doesn't help it has a privacy screen on it etc.
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Old 02-11-2010, 11:35 AM   #238
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Man i WISH i knew what the heck u guys were talkin about.LOLOLOL
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Old 02-11-2010, 11:37 AM   #239
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Follow along and learn, ask what you don't understand.
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Old 02-11-2010, 01:47 PM   #240
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The basics...

Dan had tuned his car when it had rockers. It was also tuned for summer/fall. Now it'* winter (much colder) and the density of the air is different. Then along comes Dan and he changes the amount of air that flows through his motor by camming it. Now his tune is way out of whack for the cam and weather changes. He'* saying it'* time to tune it from step one.

This is a good approach whenever you make a good change to the car.

This helps back up what was mentioned earlier in the thread. We like to say rockers and a cam are similar for power etc. Realism that they are very different. Rockers open the valves further (lift) to allow more air into the cylinders. A cam changes timing, lift, and duration as well as overlap of the intake and exhaust valves. A cam changes everything about the motor and the way it runs.
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