Tuning With The Alpha-N Algorithm

For people running FreeEMS to discuss it and ask any questions about using and adjusting it.
Post Reply
User avatar
Fred
Moderator
Posts: 15431
Joined: Tue Jan 15, 2008 2:31 pm
Location: Home sweet home!
Contact:

Tuning With The Alpha-N Algorithm

Post by Fred »

There is no Alpha-N code in FreeEMS right now, however it will be easy to add when required, so it's not a priority. This is a straight copy paste from the #freeems-dev IRC room by baldur. Feel free to add your own ITB oriented tips in this thread and we'll publish it as a webpage later.
[00:02] <@TekniQue> my preferred method of alpha-n tuning is to use a dyno (or a road for that matter) and a throttle stop
[00:03] <@TekniQue> or you know, on the dyno, it's easy enough to do it without a throttle stop
[00:04] <@TekniQue> there I would just hold the brake while I crack the throttle open to the row I'm about to test
[00:04] <@TekniQue> and then hit record and release the brake
[00:04] <@TekniQue> let the engine do a sweep up the RPM range at a fixed throttle opening
[00:05] <@TekniQue> then analyse that and make corrections
[00:05] <@TekniQue> and repeat for the rest of the rows
[00:05] <@TekniQue> and you probably want the load sites spaced unevenly
[00:05] <@TekniQue> so have the low openings very close
[00:06] <@TekniQue> there's no point in having a 90% site
[00:06] <@TekniQue> for example
[00:06] <@TekniQue> because 90% throttle is in almost all cases effectively 100%
[00:09] <@TekniQue> no point in having 90% and 100% is what I meant to say
[00:35] <@TekniQue> the thing about alpha-N is that it's easier to reach all of the load sites than with MAP or airflow based systems
Thanks TekniQue!
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!
Post Reply