Jump to content
R24

Fuel Consumption and ECU tuning

Recommended Posts

Hi Everyone,

 

I have recently got my ECU tuned and everything is working fine. There were some idling problem at start but got rectified when I increased the values in the Idle Target table.

My fuel consumption also seems a bit high even though I am not boosting and driving hard. I have a few questions to ask the tuners here to take a look into my base map and log to see what else can be fine tuned just to get a second opinion. I'm a newbie to aftermarket ECU tuning. Tips and suggestion from you guys are highly appreciated.

 

1. My Idle target is set to 880 rpm once the engine coolant reaches 70 degrees above (see picture) but the engine idles at 900 rpm above. Is this normal?

2. My throttle body has been modified to run mechanically without fly by wire function and I am using and external idle valve to control idle. How much do I need to open the butterfly valve gap when the car is off/idling?

3. Currently the overrun fuel cut is set to off when the throttle is released during cruising. Does this function effect the fuel consumption?

 

Best Regards,

 

Ragupathy

 

Log 2017-02-19 1;53;16 am.llg

IdleBaseIdleTarget.docx

Share this post


Link to post
Share on other sites

Can you post your .pclr also.

 

Looking at your log your idle control is in open loop mode.  That means the Idle target RPM table has no effect - this is only used to display target error.  In open loop mode you need to adjust the ISC base position table to achieve the idle speed you require.

If you want help with your fuel consumption then we will need a log of the car driving under typical conditions, a log of an idling engine doesnt tell us much.

Share this post


Link to post
Share on other sites

I will PM you our email address.  Otherwise, share via onedrive, google drive, dropbox etc.

If you want to reduce idle RPM at normal temp then you would reduce the highlighted values in the table below.  However if you only see 20RPM error then I dont think you will get it much better.

E6TnxDk.png 

Share this post


Link to post
Share on other sites

I will try to adjust the value and monitor if there is improvement. Will update the results here after I get the info.

Share this post


Link to post
Share on other sites

I have had a quick look at your .pclr and logs.

As for fuel economy;  There is not too much I see wrong in your basic setup but I think the main reason for poor fuel economy is just the fuel table is not well tuned so CLL is working too hard trying to correct the bad map.  There is +/-15% CLL corrections in the log. You should turn off CLL until it is tuned properly.  

As for idle;  One thing I notice in your log is the idle stepper is continuously winding in and out - this may upset your idle.  I think it is caused by the AC step, I suspect AC request comes in over CAN bus in the vehicle?  So for now I suggest you put zeros in your AC step table.

EG9xy8F.png

Share this post


Link to post
Share on other sites

Hi Adam, thank you for the feedback.

Regarding the fuel table tuning, what are the main points you see that is not so right? I will input this to the tuner as I believe that was the best he can do for the moment.

Will turning off the CLL(close loop lambda-if im correct) improve a bit the fuel consumption? 

For the AC step, Im not so sure as I got this car installed with Link G4+ when i bought it over from the previous owner. Is they any way to check for that? Or will any competent tuner will be able to check on the ECU and car? 

 

Best Regards,

 

Ragupathy

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...