Tuning Alpha-N

Bernard Fife · Post by **Bernard Fife** » Thu Sep 16, 2004 4:09 pm

For those that may be interested, I have added a "Tuning with Alpha-N" section to the manual. It is here:

http://www.megasquirt.info/manual/mtune.htm#alphan

As always, comments, corrections, and additions are welcomed.

Lance.

Flatline_Racing · Post by **Flatline_Racing** » Thu Sep 16, 2004 7:22 pm

Am I correct in assuming that Speed Density would still be best for a turbo strip vehicle?

Karl_Skewes · Post by **Karl_Skewes** » Fri Sep 17, 2004 2:50 am

sure. .. SD is best.
I like TPS accelleration enrichment too, but the MAPDot code is very cool, just started messing with it today.

OneSlow73 · Post by **OneSlow73** » Fri Sep 17, 2004 3:03 am

great little guide on alpha-n lance, i plan to use it on my ms project im puting together...465"bbc with more dur at 050 than most would believe for adv.

Bernard Fife · Post by **Bernard Fife** » Fri Sep 17, 2004 7:48 am

Am I correct in assuming that Speed Density would still be best for a turbo strip vehicle?

Yes, with boosted engines, you MUST use the speed density algorithm with MegaSquirt, because the throttle position bears little relationship to the amount of air going into the engine.

Lance.

future · Post by **future** » Mon Dec 06, 2004 12:06 pm

lance wrote:Yes, with boosted engines, you MUST use the speed density algorithm with MegaSquirt, because the throttle position bears little relationship to the amount of air going into the engine.
Lance.

And what do you think about the hybrid alpha-n VE(tps,rpm)*MAP?

I wonder if it delivers the correct fuel.

Bill Shurvinton · Post by **Bill Shurvinton** » Mon Dec 06, 2004 1:20 pm

Depends how well you tune it. In UK, most aftermarket stuff is tuned AN
and runs well. Until you go up a mountain...(sorry in joke over here)

future wrote:

>And what do you think about the hybrid alpha-n VE(tps,rpm)*MAP?
>
>I wonder if it delivers the correct fuel.
>
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Tortfeaser · Post by **Tortfeaser** » Mon Dec 06, 2004 10:07 pm

lance wrote:As always, comments, corrections, and additions are welcomed.

Just a question - why was this (below) done?

In V3.00 embedded code the fuel equation (minus the enrichments and open/close time) looks like:

PW = Req_Fuel * tps * VE(tps,rpm)
as opposed to V2.xxx code, which looked like this:

PW = Req_Fuel * VE(tps,rpm)
Note the extra factor of TPS (in red) in the V3.000 code.

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