1497 replies to this topic

[oakmere]

Exmantaa I know that the wideband dose not live map like the narrow band but I don't recommend Nick runs the car a 14.7:1 ratio for WOT runs with our current weather conditions. I would look at the modifications made by the software at lower RPM's to see if the supplied base map looks good,or send this info to Peter. Nick do you have a screen save of any fuel learn measurements?

[NickB787]

here was the last log I did

[techieboy]

I didn't think the base map is anywhere near a 14.7:1 commanded AFR though. Thought it was set to 11.8:1 commanded on basically anything like WOT.

[Exmantaa]

I have noticed that the weather plays a big part in what the fuel trims are. This could be improved by altering the transient settings in the OBD software. With air intake temp currently around 40-45 degrees C the long term fuel trims are running at about -4 for idle and normal driving. That is approx -2% fuel.

 

Haha, I spend weeks trying to get all the fueltrims to 0.0% with my LSJ ecu, but the wheater will always influence it and everyday is a bit diifferent. So I gave up and <1.5% will do for me. (And that's why the fueltrims are there...)

 

Especially the low load, idle & decelleration is difficult, as there the non linear injector flowrate plays a big part. If your injector settings are not spot-on, you will never get this area 100% right. (and every injector has manufacturing tolerances...)

[oakmere]

When you are running a fuel learn it is locked to 14.7:1 AFR. When running normally open loop AFR is calculated from the fuelling required for 14.7:1. Which is why it is important the base map is correct. The wide band method lets you check the open loop fuelling is correct without running stoichiometric(14.7:1) AFR.

[oakmere]

I am happy with the 2-3% adjustment which is better than the 10-15% in places before the ODB software.

[techieboy]

When you are running a fuel learn it is locked to 14.7:1 AFR.

 

 

[oakmere]

Nick I will take a look at the results before a Finnish work today.

[Exmantaa]

Exmantaa I know that the wideband dose not live map like the narrow band but I don't recommend Nick runs the car a 14.7:1 ratio for WOT runs with our current weather conditions. I would look at the modifications made by the software at lower RPM's to see if the supplied base map looks good,or send this info to Peter. Nick do you have a screen save of any fuel learn measurements?

 

 

Your correct and I definately don't recommend doing WOT runs in the closed loop 14.7 learing mode on a high boosted car!! That you do only for low/mild cruising loads.

[NickB787]

I will keep loads down nice cruise to pembrey, Just wish there was an easy way to check the wideband is working correctly.

[fezzasus]

before a Finnish work today.

 

[NickB787]

Nick I will take a look at the results before a Finnish work today.

Thank you

[oakmere]

It's hot I am on my phone also meant to be working! Spelling and grammar will always come way down the list. Nick just had a sneaky look and the learn is pulling fuel only so Peter has made the table safely rich. You can test the wide band by running a logging session driven normally the AFR should be mainly 14.7:1. Only where you enter open loop should the AFR change from this. Just sit at idle when warm the wide band should be 14.7:1.

Edited by oakmere, 17 July 2013 - 01:35 PM.

[CHILL Gone DUTCH]

nick have you gone back to the base map 

yesterday you put a learned map into the ECU permanent memory

[NickB787]

the "first learn" map was the one I did yesterday, which is removing fuel from Peters base map,

 

I uploaded the base map to the ecu again this morning as I am learning how to do things. I was thinking of just going for another learn session but the conditions are the same as yesterday, HOT so don't think there is any reason too. I may reload the leaned map from yesterday and try a drive today I really want to confirm the wideband is working before I do any WOT runs

[CHILL Gone DUTCH]

Just putting ideas out there

 

if you no the base map is rich which it appears to be knocking fuel of in the learn session you have done, why dont you do a power measurement on the base map and physically see if the Wideband is working from the AFR results.

 

that is why i was trying to get you to do a power measurement  on the base map on the first day. to check the wideband.

 

i have to be honest i did assume the base map was rich (safe)

 

 

 

[speedster]

Why not use the OEM ECU to operate the electronic throttle and piggyback an additional position sensor to feed a 3rd party ECU? 

[oakmere]

Nick Get the engine to operating temp. Idle and closed loop driving should be 14.7:1 AFR. So when at idle connect the software and select logging tab start logging. You can then select any sensor you want to view real time. The only thing I am not sure about is which sensor you select to get the wide band output? It may be AFR or EGR or wide band may come up? Mail Peter for confirmation.

[oakmere]

Why not use the OEM ECU to operate the electronic throttle and piggyback an additional position sensor to feed a 3rd party ECU? 

What for?

[speedster]

 

Why not use the OEM ECU to operate the electronic throttle and piggyback an additional position sensor to feed a 3rd party ECU? 

What for?

 

Cheap and saves dumping the pedal!