Thank you so much Boosted Tuning...

But say, if the idle AFR is too rich 10~11.5AFR for 10 minutes, should i adjust 3% increment on each value to the Scale & Latency table?

 

Hi Boosted Tuning,
ive tried your scaling & latencies values but my car run tremendously lean.

Ive tried few lowering 6% of my stated latencies values & the LTFT Low at idle still fix at -4.65 but my idle afr is around 13.8~14.8. Scaling is at 770cc.
If go to lower or higher my idle AFR will either super lean or super rich.

The fuel trims low at idle just dont seem to change as it does changed for awhile and it goes bck to -4.65 in a short while.

What should i do? Im very happy with the power output but just the staling issue which make me frustrated.

Thanks

 

whats your low and mid trims after 20min idle and cruising respectively?

cheers

 

Hi 07EvoIX,
im unable to log for 20 mins as my radiator fan is not working during the logging and my water temp rised. So ive to turned on the AC to lower the water temp during half way.

Btw, im using an Evo 6 ecu which i only managed to log LTFT Low & In Use.
No matter which latencies values i adjust the trims still at -4.65 on idle and the different is only the AFR.

Will putting in an HKS EIDS solve my staling problem too and is the EIDS universal for any cars?

Or putting in an E-Manage Blue is better?

Thanks

 

Did you reset your ECU and fuel trims?

For me to help you, I need you to reset your ECU, load the settings I gave you, let the car idle for 20 mins and then go on a 30 mins cruise, then report back the low and mid fuel trims.

Again, if you wanna fix your stalling issue, the first step would be to go back to a recirculated BOV.

 

NO and NO

 

Hi Boosted Tuning,
yes, ive remove the - battery terminal for at least 3min everytime before i flash my new scale & latency into the ROM
Thanks for your kind advise and i finally got my Fuel Trims Low & In Use to -1.65 instead of -4.65 during idle previously.
Ive not dont a complete 20min Idle & 20min Cruise. Will update you again once ive dont the Logs.

Attached is the Zip Short Log Exel files for your kind comment.

Noted, will get a Synapse bov to tackle my staling problem.

 

you should get the fan fixed and log idle and cruise for 20min. the trims adjust every 4 min and you will see everyone mention to log for 16min, i do 20 just for good measure.

cheers

 

Hi EvoIX,
the fan run perfectly and just stop working once awhile during logging.

Noted and will do the 20min logs asap...

 

You can save yourself some time with the 20 minute thing by just looking at the sum of the LTFT and STFT. LTFT Lo and STFT for idle and LTFT Mid and STFT for cruise. Whatever the STFT is bouncing around will be the amount the LTFT will change.

 

x2

 

I find that while you can do it that way, you get more accurate "average" fuel trims, if you actually go out and do the 20 mins idle and the 20 mins cruise.

 

I couldn't understand. can someone elaborate little more about this ?

 

Let me try to explain this a bit more clearly for you. I hope that I can.

I prefer to do this with the "live trace" window active and up front and I select "Oxygen Feedback (STFT)", LTFT Low", and LTFT Mid" for the numerical readouts in the middle of the screen.

Now, once you start your logging,at idle, your LTFT will show a number. Let's say -2.5. While idling, the STFT will be bouncing around quite a bit, but you should be able to see a general pattern or average to where it is. Let's say it seems to hang around -4.

Now take those numbers and calculate.
(-2.5)+(-4)= -6.5
Adjust your latency accordingly.

While under cruise, the same theory applies. If you have NOT recently reset the ECU, then you will have a LTFT Mid number to work with. If you HAVE reset the ECU, then you will need to go for a cruise first to see where that number will settle. Then follow the same procedure as you did for the idle, except adjust your scaling instead.

Note: I found it easier and quicker to do the scaling (cruise/mid) first, and the latency (idle/low) second..With a final result of +1.4 low, and +0.6 mid. (just yesterday afternoon actually)

I hope this helped to clear it up a little for you.
Good luck.

 

Hi,
thanks for the sharing but my Evo 6 ecu does not log Mid Fuel trim as it just log Fuel Trim Low & In Use.
Do i still need to adjust the latencies since my fuel trims (-1.65) is near to "0"?

Thanks