Stroudism

My 8 is turbo-charged and the shop that did the tuning went bananas on the rich side as I mentioned it is my Daily Driver. It idles at about 12-12.5 AFR. How can I lean this out? It seems that it's running in Open Loop. What tables to I modify in the AccessTuner? I tried changing the Closed-Loop Target A Table at .13 and .15 Load from .94 to .98 and .96 to .98 (respectively). This did not seem to help. The exit for the Target A and B is set to .99 from 1000 - 4000 rpms which seems correct. Any advice or help is much appreciated.

BTW - I am getting about 12-13 mpg in this beast, lol.

jtripp06

subscribing to this.

Brettus

iTrader: (2)

you should have a stock map to compare to
check and put back to stock all settings below 30% load and 1000rpm in these tables:
Main fueling table
C/L Target A
C/L Target B
C/L exit load A , B & C
C/L exit throttle
C/L exit rpm

Also check your fuel trims at idle - a large +ve trim could indicate a vac leak

Stroudism

Brettus, I was actually just thinking about that, but you saved me time by narrowing the tables for me. Thank you. Excuse my ignorance, but what does "+ve trim" mean?

My boost gauge shows about 22-25 mmHg at idle. This is normal, right?

Brettus

iTrader: (2)

LTFT long term fuel trim


lot higher than what i see (16-17) where is your boost gauge hooked up ?

Stroudism

I checked the LTFT while I was driving and it said 0% the whole time. I guess I remembered wrong: I am actually geting 18-20 mmHg at idle. I am not sure exactly where the boost gauge is hooked up, I forgot to check over the weekend.

arghx7

18-20 millimeters of mercury? or inches?

Stroudism

millimeters

arghx7

Are you SURE?

because that means you have a MASSIVE vacuum leak, something is up with your gauge, or some other significant problem. Engine vacuum does vary but anything less than 400 mm Hg (about 16 inches) would indicate to me problem, unless you have porting.

NgoRX8

iTrader: (1)

lol!

The normal reference for engine vacuum is inHg in this case.

Are you getting a reading for STFT at idle? If it's zero then you are in open loop so you'll need to mess with your closed loop exit tables.

Stroudism

I will double-check tonight, but I thought it was mmHg.

Stroudism

I checked the STFT at idle over the weekend, but I can't remember what it was. I think it was actually negative. I'll run it again tonight or tomorrow and report back. I'm almost positive that I'm running in open loop and I have been screwing with the closed loop exit tables to match or get close to the stock values. It has helped, but I'm still running rich at idle. I'm tempted to post my map so somebody can give some insight. Which tables are the open-loop tables?

NgoRX8

iTrader: (1)

If you are seeing negative values on the stft, you are still in closed loop. Also why your closed loop tables are affecting it. What numbers are in the closed loop a/f target tables for your idle and your a/f target table

9krpmrx8

iTrader: (46)

Why don't you just log and post it up here for all to see? That would probably help.

Stroudism

I'm dumb, it was InHg, you are right.

Stroudism

Here's my data log from this morning. You will see one point where I turned the air on and it ran really lean for a second before I turned in off (load goes up too). I'm not sure why the car has idling issues when the air is on since I added a grounding kit and new battery...

STFT is about -20% at idle... I don't know why I'm running in open loop, but my lambda is 1.0 for all values where RPM is 500-1500

NgoRX8

iTrader: (1)

you aren't running in open loop. you are in closed loop because you have a value in your STFT. with that -20 STFT at idle you can see the ecu is trying to take out a lot of fuel.

so your values in your Air/Fuel Gear tables for idle are lambda of 1.0? What about Closed Loop A/F Target A & B tables?

arghx7

MAF or injector settings/scaling

MazdaManiac

iTrader: (3)

There is a LOT of incorrect information and thinking in this thread. I'll get to it a bit later.

Stroudism

They are also around lambda of 1.0, but I will have to double check that tonight when I get home. I basically copied stock values for those tables except for where load or RPMs were out of idle range.

Stroudism

I was wondering about this as well. I know the tuner changed the scaling, but again I need to look at these values, because in the middle of the range, the values matched the stock ones. The new MAF housing is 3" where I believe the stock was 2.88"? This sound right?

NgoRX8

iTrader: (1)

Umm... Stock MAF housing is 3.375 inner diameter.

Stroudism

Oh ****, that's right. Kit came with a 3" pipe, shop had to cut and install at 3.5" pipe which is slightly larger.

Brettus

iTrader: (2)

/\ problem solved . Get the right sized tube in there and go back to stock settings for MAF calibration and start the tuning over .

9krpmrx8

iTrader: (46)

Who setup and tuned your car man?