The JDM ECU's are leaner and fuel quality is better in Japan. Unfortunately it does not sound like you are in Japan.

 

Now.. here are the logs and final map of my tuning done TODAY.

My Questions are:

1. Based on the stock EVO7 JDM map, why was it so so so lean??

2. Why did I have to add so much fuel just to keep the AFR in the 11.2-11.8 AFR range? I think I have maxed out fuel (as value 7.4) in some cells too and this is standard boost at 1.3 bar??

3. I'm almost maxing out the inj duty also, how can I improve the situation if I want to turn up boost to around 1.5 bar (21.75 psi)??

4. Any other comments on how I can make this map better? I know haven't adjusted fueling for mid-high rpms for 140 and 160 load cells (my laptop batt ran out)


PLS HELPPPPP THANK YOU!!

 

I'm in Thailand.. fuel quailty here is not that great.. probably 91 equiv I'd say.

But as you can see on my previous post of today's tuning results... it took so much fueling to get my AFRs down to a reasonably safe AFR. And i'm almost maxing out my fueling tables already.. can I rescale it somehow so I can add more fuel?

 

Pull your plugs and look at the tops of the pistons with a bright flashlight (through the plug holes). You want to make sure the piston tops are very close to each other in color. If you have a bad injector or two it will be obvious because the coloring will be much lighter than the others.

I guessing your tops will be more brown then black based on the lean tune.

You just want to make sure they are very similar to each other to rule out a bad injector. As you richen the tune up, the coloring will get darker.

 

Will do that this wkend, thank you!! One thing I noticed is that the previous owner (it's a used car I got) had S-AFC installed on the car but it was removed when it was sold to me. Not sure if that could have affected some wirings but I don't tihnk S-AFCs have injector specific wiring (so it can messed up one particular) injector?????

 

If your gas is equivelant to our 91 octane gas, then DO NOT boost more than 20-21 psi. I would shoot for high 20.6-20.8 psi.

 

As I told you in post number 17, your map is a JDM map and is designed to run on high octane Japanese gas. In Thailand you do not have such gas, you have 91 octane like I have in CA.

Switch your fuel map to a USDM fuel map and you will run rich and then start leaning out from there. You will have to pull timing as well since you JDM map has aggressive timing.

 

sorry for my noob-ness... but it's just my first time ever reflashing so pls enlighten me on the below

1. to use USDM fuel map.. do I just need to change the high oct and low oct fuel maps? Or are there other maps that needs to be changed?

Because what I did is I took JDm map and just try to richen out the parts that are lean.

 

Where did you place your wideband O2 sensor? You might have an exhaust leak next to it which is making your car run lean. A leak will allow O2 from the outside of the exhaust and will contaminate the readings. Check for leaks.

 

funny u asked.. I just got the exhaust done this wkend also.. and asked the mechanic to double check for leaks... I rechecked after that as well... no leaks I believe.

the O2 is right after the turbo-collector on the downpipe

 

Before you do this, check for leaks like I told you in my recent post. I saw the richened table that you posted and it is too rich, yet the car still gets lean readings. Make sure that your getting accurate AFR data first.

 

Where in the downpipe? If it is too close to the turbo, then you will get bad results since the sensor will overhead. As a general rule the sensor should be place at least 50 centimeters from the turbo. Evo owners general place the sensor at the end of the downpipe before the cat.

 

I think about 30-35 cm from the turbo. It might be too hot I think so I'm also thinking of moving it back to where the CAT used to be.

Also I don't htink it's the overheat issue as the sensor is brand new and I put it right in and did some pulls to log AFR right away.. it was already reading lean on the 1st pull.

If it's an exhaust leak would you be able to smell the fumes? Also when I was at idle the AFR still reads 14.5-14.7.

 

Not saying you have one, but a bad injector will cause you to run lean even with the maps richened up. I went through this myself not long ago and have since seen several evo's with one or two bad injectors.

If you had a bad injector you would have to richen the maps way up to get to a reasonable AFR, say 11.5:1. Since one injector is not operating properly you end up with 3 rich cylinders and 1 lean cylinder. So in reality you may be running 3 cylinders at 10:1 and 1 at 13:1 (not exactly but you get what I am saying, the wideband reads the average AFR)

Pull the plugs as soon as you can and make sure the piston tops are uniform. It only takes about 10 minutes to do and will at least allow you to rule out a bad injector (if they are uniform in color).

If they are all uniform and your still lean, them perhaps a fuel pump is in order or your MAF needs a good cleaning, or you have a leak between the maf and the turbo inlet allowing unmetered air into the system.

 

Thank you Looks like I gotta retune the car again... hopefully it's just some leak issue...

If it's really an injector issue.. i'm surprised the engine lasted over 30,000 km now with this kinda lean AFR