That's what we were looking for.

Can be, if you tune it that way. Merlin's guide suggests this, utilizing MAF adjustments. On speed Density, I am not sure of how to achieve.

It should look something like this: Note, these are relative AFR map to gauge, within a +/-.3 tolerance

 

I would say closed loop. Im not forcing the car in closed or open I just start the car and let it get to closed loop. I haven't really been doing much tuning im just scared to go passed slight throttle since ive made fuel map adjustments.

 

Yes I understand he suggests 12.0 wb02 reading across board. Not 12.0 in every map cell .

So lets say I shoot for a afr of 12.0.
My wb02 reads 10.8 and my High octane map has a 12.8.

Is it safe to keep raising High octane map cell until target is reached? Or would I lean out globally and richen up map to stay below the `14.7 number in my high octane map?

 

Thanks for the replies People! Im just trying to rap my head around some of this before I really get into my tune.

All input welcome and appreciated.

 

Thanks RaceGhost. I have all components for speed density set up. I just want to get my head around the maf tuning before tuning sd.

How can I show you guys my map on here?

 

Pul it up in software, so it's visible like mine. Then do an ALT + PRT SC on your keyboard, then when your in the reply portion of your post, select the picture looking icon above the message window, then right click and past where it states to past.

 

SD gets rid of the MAF feature. Infact I believe you pull it from the car when you go SD.

 

Yes you get rid of it and make for better breathing w/o the honey comb.

 

Sounds like your injector or MAF scaling is way off if you are getting close to 14 in the fuel map to get close to 12.0 AFR on your wideband.

 

A Richer mixture keep the cylinder cooler .

12.0 Is pretty lean in my book for pump E85. I've tested a few different evo's on the dyno and there wasn't any more power/smoothness made with going leaner then 11.2-11.5. Now, Going richer is harder to ignite but thats generally richer then 11.0. Bring the plug gap to .018-.022 depending on boost levels.

The 4g63 is an old engine and likes a richer mixture.

It may live at 12.0 but if its not making any more power, then you are better offer being closer to 11.2-11.5 so it cools the cylinder. Also with the stock ecu fuel temp can change AFR and if you tuned for 12.0 AND then it went leaner you could damage the engine.

Same rules go for timing, Be conservative. It needs to be picking up decent power on a dyno on each degree or the timing needs to comes back out. The old saying goes "The last two will get you"

Hope that helps
Edit, Remember your wideband is reading an average of the afr. If you run things leaner , some cylinders can get less then others. Just another reason to run low 11s.

 

Thanks for the educated input. There is so much mixed feelings about target afr.

I am understanding now. Now does the high octane map need to have certain ramps or curves? And also does the smoothness of the map effect performance?

For instance it being close to flat. Will that affect anything?

 

RazorLab those numbers i input were just used for an example. Those are not numbers i am dealing with.


I work full time and i usually log in the morning and after work on my way home and to work. They are not wot logs just barely cruising and also some 50% tps pulls to be safe. Then i get home and look at logs and then make map adjustments. I made a high octane map recently and been adjusting little by little. Today i made some more adjustments and i seem to be heading in the right track. Im now seeing 12.8 spool up and tapers to around 11.8 around 10 psi.

 

So finally did a wot full boost pull in 3rd gear. Afr Much better saw 12.4 or so spoolup and tapering off to 12.0 then 11.8.

0 counts of knock.

10 psi at 4000 rpm
31 psi by 4800 rpm

I did notice my afr go from 11.8 to 12.0 then 11.7 all during wot run.

Im thinking my need to smooth my map so I don't have such variations in wb02 afr.