OFT for grimmspeed intake!

[FenrirRedsteele]

hello all,

i was poking around various threads and saw there was a specific tune for the grimmspeed intakes running stage 1. i was wondering if it would be possible to get a tune for the CAI running a stage2+ tune.

if you need any info ill be happy too provide it just not sure what to put for now.

2013 brz

[steve99]

Grimspeed intake naf scaling is very close to stock.


So standard oft tune should be fine just log ltft and see it liw and log commanded afr vs afr doring full throttle run make sure they follow each other

[Lakitu]

I'm currently working on fixing this as well! You will need:

The OpenFlash Tablet itself
DataZap account
RomRaider v0.5.9
MAF Scaling v2.5.1
OpenFlash Manager 1.32

Disclaimer: this is just what I did personally after a few hours of research and trial and error. It fixed my LTFT issues and car feels much more lively. I have Grimmspeed CAI and JDL catless header. There is probably a better or faster way but this is working for me. This is what I did:

1. Install all software needed

2. Go to OFT website and download the latest tunes for your car. (I'm using OTS_v4.03 for the quiet startup). I'm assuming you have already flashed a OFT tune and know your Calibration code.

3. Extract the OTS zip file, load RomRaider and select the correct ECU definition XML file. Then make a copy of your current OFT tune and call it like "Stg 2+ v4.03 - My Tune" (Stg 2+ because I have catless header). If you already have the latest tune installed, you can skip this step. Otherwise, write it to the OFT tablet.

4. Go to car, plug in OFT and flash tune if you don't already have the latest tune installed. Setup OFT to show data for Engine Speed, Engine Load, LTFT, STFT, MAF Voltage, AFR, Fuel Sys status, Intake Air Temp, MAF, Command AFR, Throttle. I optionally have also logging Adv Multiplier, MAF, Knock Correction and KC Learned.

5. Go for a 1 hour drive with OFT connected and recording datalog. 30 minutes of casual street driving and 30 minutes of highway driving in 6th gear, preferably up long climb at constant speed. OFT records only up to 20 minutes so there will be 4 takes, or 4 datalogs total.

6. Use the Open Flash Manager to get the datalogs to your PC, then upload the logs into DataZap so you can visually see the everything.

7. Go to "Closed Loop" tab. Basically follow the instructions in the leftside "Usage" tab. You can also find the same instructions on the MAF Scaling Wiki.

You will need to copy the MAF Sensor Scaling table from your tune in RomRaider into MAF Scaling software "Current MAF Scaling" area, and also copy the Primary Open Loop into "POL Fueling" popup as well. Just have to make sure to keep copying the new scaling table it generates from the "Chart" tab into "Current MAF Scaling" before you run more adjustments.

8. Next do the "Open Loop" tab. Maybe not required if you have good log the first time, but might be a good idea to repeat another hour of driving and do 4 more logs and do another adjustment of Closed Loop before this for more accurate CL. But at least Open Loop is quicker to do as you just need 4-6 WOT pulls in 3rd or 4th. Better to do on highway at midnight weekend with no traffic.

7. Maybe optional but I also ran the MAF Scaling software to do MAF rescale option. Click "MAF Rescale" tab and follow the instructions to trim off the top upper parts of the scaling that will never be reached with the stock sensor. Looking at the datalogs in DataZap, mine tops out at 4.07v so I set the max to 4.3v for more headroom. I can probably go lower but I think this is safe and good enough. This changes the resolution and increases accuracy of the datapoints between min and max.

Just make sure the filters are correct so it can filter out junk data for OL and also CL adjustment.

This is very time consuming between all the driving, loading logs from tablet (really slow), writing to tablet (also slow), and flashing ECU. Also make sure the temperature consistent while datalogging, better to do it all in the same day. I'm still working on it but I can tell you my car definitely feels more alive after 2 CL adjustments and 2 OL adjustments. I had a problem with my LTFT in -18% in CL and -2% in OL. now its no more or less than 3% and -3%. SUCCESS!

[Lakitu]

Actually, don't follow my instructions for OL. I'm not 100% sure if I have mine setup correctly with a curve like this.


I'm still learning, but it looks weird to me to see a higher voltage reading actually lose air flow. It should always go up, I think...? Not sure what that's all about. I think I didn't filter junk data properly on the OL or I have an intake problem.



After CL:
Attachment 168255


After OL:
Attachment 168256

[freerunner]

Originally Posted by Lakitu

After OL:

Looks like something went wrong. If I ever had to re-scale my MAF, I'd do it like this(NA):

1. Copy stock MAF scale

2. Zero out Load Comp B

3. Zero out all three PI/DI ratio maps

4. Go logging. Closed-loop only. The more data, the better. Don't bother going for open-loop yet.

5. Feed data into VGI MAF scaling tool, filter out anything above 3.2V

6. Feed results into 86inches' maf shaping tool ( http://www.ft86club.com/forums/showthread.php?t=75710). Follow instructions on first sheet. Put focus on 3V/60g/sec. Get this to 100% original(rescaled) value.

7. Go logging to verify.

8. Final fuel trim should be OK now. If not, adjust 3V cell slightly. Simply accept all changes done to the upper points.

9. Adjust 3.4 V upwards for open-loop manually. Don't adjust 3.20V rationally. Use it to smooth-out between 3.0V and 3.4V

10. Copy back stock di/pi ratio tables. Log.

11. Look for anomalies at 5200 RPM when PI kicks back in. Sudden lean or rich conditions indicate necessary changes to the PI scalar.

12. Done. Don't ever change maf tables for voltages <= 3.20 V ever again, else your open-loop scaling is toast and the story repeats over and over again.Further adjustments to the open-loop points are no problem.