Weather Dependency on calculated load questions (timing table)
Thread Starter
Joined: Nov 2001
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From: Cecil County Raceway!!!
Weather Dependency on calculated load questions (timing table) I've seen some equations fly through that had it as a function of MAF flow rate and rpm.
I have tried this and the ATAP measured timing was a few degrees lower than what the table said it should be (no KR either) <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Whats bugging me is that apparently operating conditions (IAT and Barometric Pressure) have alot to do with it too <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> I know back in my juicing days, I'd trick the IAT with a resistor to knock a few degrees of timing (made it think it was hot as crap outside). So how can we incorporate IATs and Pressure into these to get a "true" calculated load?
TIA
<small>[ April 17, 2002, 09:30 AM: Message edited by: Fireball ]</small>
I have tried this and the ATAP measured timing was a few degrees lower than what the table said it should be (no KR either) <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Whats bugging me is that apparently operating conditions (IAT and Barometric Pressure) have alot to do with it too <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> I know back in my juicing days, I'd trick the IAT with a resistor to knock a few degrees of timing (made it think it was hot as crap outside). So how can we incorporate IATs and Pressure into these to get a "true" calculated load?
TIA
<small>[ April 17, 2002, 09:30 AM: Message edited by: Fireball ]</small>
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From: College Station, Tx
Re: Weather Dependency on calculated load questions (timing table) There are quite a few other tables that will modify the desired value - e.g. it may call for 40 degrees, but then a temp correction table will call for a subtraction of 3 degrees.
I wouldn't alter these too readily unless you are going to test it out in different weather conditions - it's a good thing as it allows you to tune agressively without worrying to much about how that tune will change with different weather.
Chris
I wouldn't alter these too readily unless you are going to test it out in different weather conditions - it's a good thing as it allows you to tune agressively without worrying to much about how that tune will change with different weather.
Chris
Thread Starter
Joined: Nov 2001
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From: Cecil County Raceway!!!
Re: Weather Dependency on calculated load questions (timing table) ok...thats what I was wondering...so the straight maf flow rate and rpm will get me a calc load...and any deviation I measure with atap from that table is weather dependent?
