[bmw_fanatic]

Hello

Just wondering if anyone noticed that on the new Procede v.5.3 software, under the user map adjustable, there is a new future "OL Fueling", anyone know what this the function of this new future?

Thanks

[Overboost]

Its a global offset for the Open Loop Fueling tables.

[bmw_fanatic]

Thanks!!! Is there any chance that I need to make adjustment on this setting?

[ttbmer]

Originally Posted by bmw_fanatic

Thanks!!! Is there any chance that I need to make adjustment on this setting?

No leave it alone unless shiv tells u otherwise. Email him some log he should be able to tell u.

[Tzu]

If your fuel trims are high (positive or negative), you can adjust it on a per map basis accordingly. I tried to keep mine <10%. Normally I saw fuel trims swing most at the onset of WOT and settle by a few points after.

Adjusting OL Fueling scaler to a medium would be easier than modifying individual cells in the OL Fueling map. I used 5.2 at the time though and this option was grayed out.

[enrita]

Originally Posted by Tzu

If your fuel trims are high (positive or negative), you can adjust it on a per map basis accordingly. I tried to keep mine <10%. Normally I saw fuel trims swing most at the onset of WOT and settle by a few points after.

Adjusting OL Fueling scaler to a medium would be easier than modifying individual cells in the OL Fueling map. I used 5.2 at the time though and this option was grayed out.

ok so if on map 1 they are pretty much maxed out positive and its set now to 100% what value should be set ?

[Tzu]

set a fail value and buy a cobb

...dont get me banned enrita.

[enrita]

Originally Posted by Tzu

set a fail value and buy a cobb

...dont get me banned enrita.

[Tzu]

Evidently people dont joke around on here anymore.

If you trims are maxed and cant reach your AFR target, ask Shiv for advice.

[enrita]

Originally Posted by Tzu

Evidently people dont joke around on here anymore.

If you trims are maxed and cant reach your AFR target, ask Shiv for advice.

no here is serious business i just wanted to know from your experience how much you would lower if they are maxed out

[Tzu]

In my case, I was seeing swings in trims initially from 23-28, and settling around 17-23ish. For a car with stock twins, this isnt terrible, but if I can adjust it, why the hell not. I only experimented with scaler offsets between 5-15% with decent success. Wasn't too concerned at the time as the logs reported mid 12's AFR.

In the OP's case, I don't think many people have to worry about the OL scaler.

[bmw_fanatic]

Originally Posted by Tzu

If your fuel trims are high (positive or negative), you can adjust it on a per map basis accordingly. I tried to keep mine <10%. Normally I saw fuel trims swing most at the onset of WOT and settle by a few points after.

Adjusting OL Fueling scaler to a medium would be easier than modifying individual cells in the OL Fueling map. I used 5.2 at the time though and this option was grayed out.

Thanks for the reply Tzu.

Let me try to rephrase to see if I get what you are trying to say.
So by datalog the fuel trim channel, if there is a + or - swim on fuel trim say on map1, I would then adjust the value + or - of OL fuel trim accordingly?

However, if the current AFR seems to be within 13 or below then there is no need to make adjustment on OL fueling scaler?

[ttbmer]

At 1 point I went down to 30% and still seen negative numb on the fuel trim up on top close to redline. So I call shiv he suggested I change my precede so he send me a new rev2.5 and it's working perfectly now.

[bmw_fanatic]

Originally Posted by ttbmer

At 1 point I went down to 30% and still seen negative numb on the fuel trim up on top close to redline. So I call shiv he suggested I change my precede so he send me a new rev2.5 and it's working perfectly now.

Thanks for sharing ttbmer, so what I need to do now is Log!

[ttbmer]

Originally Posted by bmw_fanatic

Thanks for sharing ttbmer, so what I need to do now is Log!

Yes log WOT 3rd and some 4th gear if u can read a log and know wa to look for with fuel trim then u good, but if u like me new to this then email shiv ur log.

[Jeff@TopGearSolutions]

I wouldnt recommend anyone messing with OL fueling unless you've sent a log to vishnu and they advised you to change something.

[Joshboody]

Actually I've changed my table pretty drastically and have seen improvements, but I think either my hardware or potentially BMW software is different then most. If anyone is MT and running latest maps I'd love to view some logs as comparison. PM me.

Some notes on mapping fuel:
- OL global adjustment is a %, so basically multiple by table value for actual OL modifier
- Fuel correction is the OL value being applied. I believe this is a subtraction to the rail pressure voltage which makes the DME add pressure.
- Fuel pressure is related to fuel correction. I am curious what the actual relationships are: voltage = fuel cor and voltage = pressure.

According to Shiv you want to see positive trims so you are always adding fuel. I noticed very poor performance with overly negative trims. And this can be noticable in your AFRs with either fluctuations or too rich/lean then the target. I think there does need to be a little refinement to the AFR table potentially since everyone (at least the logs I've seen) seems to be slightly rich... in my opinion at least. I haven't touched these yet.

[Tzu]

Originally Posted by ttbmer

At 1 point I went down to 30% and still seen negative numb on the fuel trim up on top close to redline. So I call shiv he suggested I change my precede so he send me a new rev2.5 and it's working perfectly now.

I've heard this, but Vishnu is insistant that there is no difference between my 2b unit and the 2.5 in terms of fueling. I figured there was some software enhancement going on, I dunno.

Originally Posted by bmw_fanatic

Thanks for the reply Tzu.

Let me try to rephrase to see if I get what you are trying to say.
So by datalog the fuel trim channel, if there is a + or - swim on fuel trim say on map1, I would then adjust the value + or - of OL fuel trim accordingly?

However, if the current AFR seems to be within 13 or below then there is no need to make adjustment on OL fueling scaler?

I beleive vishnu only reccomends that OL fueling be changed if trims are very POS or very NEG (>+-20ish). On that note, I've logged many runs where trims go from say +25 to +17 on one day, and then from +18 to -5 on other days, on both default maps and maps where I slightly modified AFR targets.

bmw_fanatic, if youre unsure, send your logs to vishnu. No reason why they shouldnt be able to check it out and give you a reccomendation. Though for most of the cars on here, you wont need to touch the OL fueling map.

[Ilma]

With the latest maps I think Shiv has increased OL fuelling quite a bit in order hit the AF target sooner after WOT onset.

It does the trick based on many of the recent logs we are seeing posted.

But he did go on record stating that he feels the engine runs best with slightly elevated fuel trims and less OL fuel adjustments.

That parallels my experience.

The less OL fuel adjustment I apply......the fuel trim graphs become much smoother and have fewer spikes and oscillations. So there is more stability in the fueling process.

I think this means the DME is happier overall as I experience significantly more post-shift timing flatlining when a lot of OL fueling is used.

The downside is you run a little leaner a bit longer at WOT onset.

[OpenFlash]

Originally Posted by bmw_fanatic

Hello

Just wondering if anyone noticed that on the new Procede v.5.3 software, under the user map adjustable, there is a new future "OL Fueling", anyone know what this the function of this new future?

Thanks

For 90% of users, there is no reason to adjust this value with the beta maps. It only comes into play for those running in unusual conditions or with lesser common combination of mods. In such cases, it can be helpful to dial the raw fuel table up and down a bit to keep fuel trims from maxing out. In a future version of the beta firmware, we hope to make this an autotuning feature much like wastegate compensation.

Shiv