Base tune your EFI without a wide band

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Base tune your EFI without a wide band

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Base tune your EFI without a wide band - 5/28/2008 3:09:48 PM

JohnCannon

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From: Mobile Alabama
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For those who have snorkels and live in areas of the world that do not have any way of reading your A/F numbers here is a way you can tune your EFI out.

This only works for the Power Commanders. The Optimizers are crap and will not let you tune small areas of your EFI map.

EFIs and carbs tune out very differently but some of the tuning methoods for carbs can be adapted for EFIs. A carb can be tuned by reading your plugs in 3 different areas. Idle, half throttle, and wide open throttle. If you install clean plugs into the motor you can let sit at idle for a couple of minutes, pull the plug out and read the plugs color for a lean or rich A/F condition. You can do this same methood for part and WOT.
EFIs can be rough tuned in using the same methood.
1) Start by installing a clean plug in just the rear cylinder. (There is no need to install a new plug in the front because both cylinders use the same map unless you advance the map)
2) crank the motor and let run for 5 minutes at idle. Read the rear plug.
3) connect to the PC3 with your computer.
4) If the plug looked dark subtract 5 from current map values in the 0%,2%,5%,and 10% throttle positions from 1250rpm to 8000. (most of these RPMS will not be used but to be simple you can edit all the values in these ranges)
5) On average adding or subtracting 5 points from the map will effect your A/F by 1/2 point. So if you was at 13/1 A/F and subtracted 5 you would be at 13.5/1 A/F. During a base tune I would only use multiples of 5 when adding or subtracting. You will nto be able to tell a difference subtracting or adding lower then 5.
6) Plug check your idle again until the plug has a slight tan color.
7) Next do your WOT the same way you did your idle only this time you will only be editing the 100 column on the map. A few long WOT runs should be good enough to get you a reading
8) after the WOT tune is done you can do the other throttle positions by screwing in the throttle stop screw in so that the "%Throttle" field on the PC3 does not go past the throttle position you are tuning.

This is one step closer to fine tuning your EFI.

You can find more how-to articles and videos on MUDandDIRT.com.

Enjoy

< Message edited by JohnCannon -- 5/29/2008 6:32:29 AM >

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RE: Base tune your EFI without a wide band - 5/28/2008 3:34:18 PM

KrisF

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You're the man!

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RE: Base tune your EFI without a wide band - 5/28/2008 4:11:57 PM

Dirt2race

Posts: 161
Joined: 1/20/2008
From: Apex, NC
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Perfect explanation John, you have a way of explaining things and making it seem so simple. Thanks for all you do to make all of us a little faster. I purchased the optimizer when I first built this bike and have been happy with it, but I do plan on changing to a PC at one point.

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RE: Base tune your EFI without a wide band - 5/28/2008 5:31:31 PM

kscowboy

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Great tip John.

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RE: Base tune your EFI without a wide band - 5/28/2008 7:02:35 PM

engie

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From: Jackson/Starkville, MS
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added to the helpful links sticky!

Great info! The way you presented the a/f change is a new and much easier method of thinking for me! I had always done exact math. What I mean is, "turning the map up 10 points means your adding 10% more fuel, so if your at 14:1 a/f, you will be 10% richer, thus 12.6:1 would be the new ratio."

I would also like to know more on the method of adding a consistent(say plus 5) value to multiple cells at once. I was unaware of the possibiliity in the dynojet software until I saw Martymoe do it. He's from PRC forum, and THE guy to talk to about understanding ATV EFI. He consistently blew my mind with his knowledge, and it isn't VERY easy to do

. He runs his RZR on closed-loop using a pc3 and wideband commander, along with some custom software he built...

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RE: Base tune your EFI without a wide band - 5/28/2008 9:08:02 PM

biggbowls

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Closed loop......hhhhmmmmmmmmm

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< Message edited by mud_dog450 -- 9/22/2008 6:49:15 PM >

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RE: Base tune your EFI without a wide band - 5/28/2008 10:58:38 PM

JohnCannon

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We getting in deep now!!!!

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RE: Base tune your EFI without a wide band - 5/29/2008 12:31:35 AM

camlaw

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you said,john to let it idle for 5 min. then do the wot, the same. do you mean , keep it at wot, for 5 minutes ?

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Post #: 8

RE: Base tune your EFI without a wide band - 5/29/2008 6:31:44 AM

JohnCannon

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No. Making a couple of long WOT runs back to back should give you pretty good reading. Sorry

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MaD MOTORSPORTS CUSTOM EFI TUNING

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RE: Base tune your EFI without a wide band - 5/29/2008 8:17:08 AM

MONSTERQUADMANIAC

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Great Post John. This should get me by until I am able to get over to Mobile for a Race Tune

.

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RE: Base tune your EFI without a wide band - 5/29/2008 9:28:23 AM

bobhoffmann

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does anyone know if a pc3 for the can an 800 can be used on the 650 outlander since they don't sell one specifically for that model? thanks

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RE: Base tune your EFI without a wide band - 5/29/2008 11:18:24 AM

JohnCannon

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Yes but the tune will be way off.

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RE: Base tune your EFI without a wide band - 5/29/2008 12:17:24 PM

biggbowls

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quote:

does anyone know if a pc3 for the can an 800 can be used on the 650 outlander since they don't sell one specifically for that model? thanks

Got one on mine......was told it had a 650 map but turns out it had the 800 map.......changed maps and has more snap.....waiting for the tuning.

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< Message edited by mud_dog450 -- 9/22/2008 6:49:15 PM >

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RE: Base tune your EFI without a wide band - 5/29/2008 1:23:34 PM

bobhoffmann

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where were you able to find a map for the 650? and was it for stock or running a certain pipe and filter? I'd go that route until I can get it to a dyno and tune it. I also have a wideband 02 sensor that I can use to see how far off the a/f readings are thanks

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Post #: 14

RE: Base tune your EFI without a wide band - 5/29/2008 3:32:23 PM

bobhoffmann

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went to power commanders website and see that they now have a map for the 650. didn't a couple of months ago

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RE: Base tune your EFI without a wide band - 5/29/2008 4:42:07 PM

kleinwild

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Great tips but i would much rather pay you!

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RE: Base tune your EFI without a wide band - 5/29/2008 8:41:24 PM

cleonard

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quote:

ORIGINAL: bobhoffmann

does anyone know if a pc3 for the can an 800 can be used on the 650 outlander since they don't sell one specifically for that model? thanks

i think they make a 650 specific one now.

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