223 replies to this topic

[CHILL Gone DUTCH]

Also get a logging session done trying to capture the stutter

[DaveyC]

Wideband is reading 14.7:1 AFR during the stuttering so not sure what OBD tuner doing a learning session is going to change - surely it will also be seeing stoich and as such make very little change to the fuel table? - unless the learning session does something other than just write fuel adjustments that is.

 

I'll do another learn session over the weekend.

 

I'll take a screenshot when I get home this evening.

[DaveyC]

Also get a logging session done trying to capture the stutter

 

I've got logs from a couple of months ago, but I'll capture a new one for you to take a look. Peter has cast his eye over the old stuff quite a bit and hasn't seen anything telling.

 

Also I notice that the car behaves really oddly when I dip the clutch and blip the throttle from very low revs. i.e. cruising in 3rd, brake to slow down, dip clutch, revs drop to 1kish, blip throttle and it just splutters instead of revving. Works totally fine at higher rev ranges.

[CHILL Gone DUTCH]

Recently been helping soMebody else who got stutters after using his wideband for full throttle mapping Have you re calibrated it ? Try doing a low rev fuel relearn using the fuel learn ( not wideband ) and might be a good idea to check the input settings of the wideband and re calibrate it

Edited by CHILL Gone DUTCH, 07 August 2015 - 11:23 AM.

[CHILL Gone DUTCH]

What are your fuel trims like ??

[DaveyC]

Recently been helping soMebody else who got stutters after using his wideband for full throttle mapping Have you re calibrated it ? Try doing a low rev fuel relearn using the fuel learn ( not wideband ) and might be a good idea to check the input settings of the wideband and re calibrate it

As the moment I'm using the wideband completely separately from the ECU so they are not linked. Did all of my wide open throttle tuning in the rolling road manually adjusting the fuel and ignition cells. I'll take a look at the trims later.

[DaveyC]

https://drive.google...iew?usp=sharing

 

Link with the latest read from the ECU showing fuel trims.

 

No logging yet, but will get some done this afternoon, do a learn and then log again.

 

[DaveyC]

https://drive.google...iew?usp=sharing

 

this file has a quick log with the car in neutral misbehaving when I try to hold it at a constant throttle pedal position and also shows the laggy response of the engine when the throttle is blipped from idle.

[CHILL Gone DUTCH]

What are the fuel trims on the general tab Are they within -5% and +5% Ish

Edited by CHILL Gone DUTCH, 08 August 2015 - 12:06 PM.

[DaveyC]

Yes:

                            0-25%   23-35%   35-70%   70-100%

      0-1800rpm      1.2         0.6           -0.8         -0.3

1800-2200rpm      3.9         1.4            0.0         -1.2

2200-2600rpm      2.2        -0.2           -0.1         -0.4

2600-3800rpm      1.6         0.1            0.4           0.2

3600-limiter                                                          0.6

[CHILL Gone DUTCH]

So the ecu thinks the car is Fueling correctly Have you changed the lambda ??

Edited by CHILL Gone DUTCH, 08 August 2015 - 04:44 PM.

[CHILL Gone DUTCH]

I will look at the logs in 30 mins

[CHILL Gone DUTCH]

I've found a potential problem in your map

[CHILL Gone DUTCH]

try this at let me know if its any better

Attached Files

•  15-08-08 184448 Chill test.smp   19.09KB   7 downloads

[CHILL Gone DUTCH]

just put it straight on the car and try it 

[DaveyC]

I'll go and give it a try now! Thanks for the help! I changed both lambada sensors in the past few months. I used an oem one for the primary and a cheap one for the secondary.

[DaveyC]

https://drive.google...iew?usp=sharing

 

quick test drive log with your new calibration

 

[CHILL Gone DUTCH]

Was it any better ??

[DaveyC]

Was it any better ??

Hard to say subjectively felt a little better but certainly still has a problem.

[CHILL Gone DUTCH]

I didn't change it as much as I wanted to but if it's going in the right direction in happy to go more aggressive