First... what the heck does "Alpha-N" stand for, anyway?
Okay, so I started using Alpha-N below 2000 rpm to get better control of the idle on my engine because it has a VERY peaky MAP signal. Worked like a charm, allowed me to tune the low rpm areas for some civility for things like idling around in 2nd gear and such.
Yesterday, I finally decided to go full Alpha-N with it to see what it would do. I'm still in the early stages of tuning it, but so far it seems to be coming together nicely. I'm finding "midrange" that I didn't have before, which is nice.
On with the questions!
Wondering if the Alpha-N MAP translation is used for timing or if the timing advance is still based on "real" MAP? Could make for some interesting tuning of the timing map if Alpha-N is in the equation.
And I'm wondering if my logic is correct for how I've set up the Alpha-N TPS table. Here's what I did:
I changed my MAP bins in the VE table to every 10 kPa from 10-120. If the Alpha-N interpolates the way I think it should, having the first 10% of TPS translate to 60kPa gives me 6 bins of resolution for just off-idle. (probably overkill, but what else am I gonna do at 1000 rpm???) Going up from there, I start focusing more on the mid range, ensuring that I always have a 1:1 relationship between TPS and kPa in the mid-throttle range. And, on the high-end, where I'll not really be using low throttle, I've expanded the high-throttle bins to give finer throttle control up there.
I know that not many people seem to be using Alpha-N, but if anyone can confirm that I'm headed in the right direction, it would be appreciated!
Alpha-N Questions
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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loren
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Alpha-N Questions
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LBC + Technology = ???
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loren
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Re: Alpha-N Questions
Thanks, Lance. That makes perfect sense. I figured it was some "engineer-speak".
No hints on whether Alpha-N affects the timing map or not?
No hints on whether Alpha-N affects the timing map or not?
LBC + Technology = ???
Re: Alpha-N Questions
In alphaN mode the tps based map, not the sensor one, is used to determine spark advance. I had originally had an input for enabling/ disabling this, but never wrote the code for it.
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loren
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Re: Alpha-N Questions
Thanks for clearing that up! Alpha-N seems to be one of those things with very limited documentation in the manual.
LBC + Technology = ???