Just thaught I'd share. For the past few days the Lancer has been running really rich. The a/f gauge was lighting up the last 3 bars on the rich side whenever I would gun it. Given the fact it's only a narrowband gauge there is no way for me to know exacly how rich it was running, I still feel confident saying it was pig rich. So I put my stuff together, took some knowledgeable people's advice in tuning with a Narrowband and hooked up the R4.

RoadRace started taking fuel out at -1inhg/2500rpm till 0.5lbs/7000rpm.

. I selected the area they had modified and took out an extra 4% of fuel.
. I copied their -1inhg column and used it for everything between -5inhg and -1inhg
. With performance and gas economy in mind, I also took out 1% on everything between -11 and -6.

Note that all the changes were made above 2500rpm. 1% less fuel might look like very marginal, but I can tell you I have never seen a gas tank last me that long.

The narrowband still shows a little bit too rich in 5th which leads me to beleive I could take even more fuel out. Didn't get a chance to Auterra Dyno it yet, but I know the car feels different. Can't wait to see the power curve.

 

don't go too crazy without wideband. if you are unsure whether or not that gauge is reading within a fair range of accuracy --> run the car for an hour or two then pull out your spark plugs. they will tell you everything you need to know about being rich or leaning out. good luck with getting the fuel map you set out to acheive. and props for posting how you went about tuning your map.

 

That's why I only go 2-4% at a time.

I thought about pulling out the plugs, but I don't really know what to look for

BTW... I will be glad to share the map(customer file) if anyone wants to try it out or have a look at it. Hopefully RRM won't mind since it's no longer their original settings.

 

http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

Don't know what to look for? Well, now you do. Good luck blaze, and get the wideband gauge. I will after I will get my tax refund.

 

Thanks greg. I'll change my plugs this week(they're way too old) and make a few runs then let you guys know.

I think I read somewhere A/F readings considered when tuning should be the readings I get in 4th gear. Is that correct? The reasoning behind that was because the mixture gets leaner as you go up in gears.

So...

5000rpm in 3rd gears being pig rich, might result in stoich 5000rpm in 4th.

My concern... if I get the perfect sweet spot in 4th, that same spot will become lean in 5th. Any thoughts or pointers?

 

There is no difference in how lean/rich you are in each gear. The only thing that would change is the load.

 

if you don't know what to look for on the plugs, i wouldn't be too confident in your changing rrm's fuel maps.

 

That's the line I was referring to:
From thread: https://www.evolutionm.net/forums/sh...d.php?t=146590

 

here's a link to another site with spark plug readings. less complicated than greg's with a little bit of a written explanation....then again i do like his better just putting the info out there though.

Spark Plugs

 

sounds like your map is similar to mine Blaze. i got -3% fuel from the base tune, and also widened the effect area. the change start at 2,000 so power comes on a bit earlier

 

ME want corey! sharing is caring... ill swap u headers for a day so we can test power difference?

 

keep in mind my car is an 04. so some of my settings are different, which would cause a pretty erractic idle in an 02-03

 

And I thought I was the only one Glad to read somebody else is also refining the piggyback. I thought about changing the map between 2000/25000rpm, but I figured I wouldn't play around with my "cruising" rpm.

 

actually that doesn't matter you see. the piggybacks power only really comes into effect when you car is in openloop mode, which is heavy or full throttle. with any normal afc you can't directly control the ECU's fuel trims while its in closedloop(partial throttle, idle).

so bringing the point down to 2,000rpms shouldn't change anything while u are cruising, just when u are getting on it.

 

With the stock map it affects only WOT because it was programmed that way. The stock map modifies value in the -1in/hg, 0, 0.5 psi. Those 3 values can only reached at Wot. But OpenLoop is reachable accross the whole powerband. As soon as the Ecu sees the throttle open up more than a certain value it switches mode. You are most likely right in saying the values at 2000 shouldn't have any side effect. But if you modify values in the in the other cells(lower than -1in/hg) they will defenetly be read when the ecu switches mode. I hooked up my Auterra thingy and looked at the fuel delivery mode a few times. It changes way more often than some people think. A little throttle here and there will force it to switch forcing it to read from the Piggy at the same time.

I may be confusing Open/Closed loop terminology, but I think you get the point I'm talking about.

What I'm trying to say is... If more cells are modified, the piggyback can kick in even when not at WOT.

But correct me if I'm wrong. That's the impression I got when I first looked at the map, and it's the main reason I went ahead and modified lower than -1in/hg