[f00dstamps]

It appears that O2 sensors are wear items so it may be a good idea to replace mine anyways since I'm at 83k miles.

[Yozh]

Log voltage at your O2 sensor and see what it reports at rich.

Also, a curious thing to note that OEM BMW used a straight LSU4.9, where a diesel specific LSU4.9D is more appropriate, resistant to soot and works quite well. Bosch part number 17466

[f00dstamps]

Originally Posted by Yozh

Log voltage at your O2 sensor and see what it reports at rich.

Also, a curious thing to note that OEM BMW used a straight LSU4.9, where a diesel specific LSU4.9D is more appropriate, resistant to soot and works quite well. Bosch part number 17466

Dumb question but how do I log voltage at the O2 sensor? Is there a PID for that within torque or do I need to connect an oscilloscope and go to Mexico?

I had questioned whether soot may have an impact on the O2 sensor myself. Unfortunately, I do not have any pre-delete and tune logs to compare.

I was unable to find the spec sheet on the 17466. I could not find where it benefits a diesel application. Are you currently using the Bosch part?

[Yozh]

I actually should correct myself. Wideband O2 Sensors do not do voltage, they are actually current based and each manufacturer has their own way of doing this.

This may be useful:

I was able to do some logging in Carly parameters and comparing to my old O2 sensor my new one does not dip down as far. For example, at idle on our cars, you should be getting 0.85, at zero throttle coasting 1.23 and full throttle 0.59. My old one was dipping to 0.19 that too me was reporting too rich and result in DDE corrections to defuel. These are just my brief observations and my not be correct. Replacing the O2 sensor is not difficult and took me an hour, but resulted in a significant driveability improvement so far. Given that their life expectancy is about 120k Miles, some of us may be getting into that range. Mine was $129 with shipping and I did it on a hot manifold so it breaks loose easier.

These may be useful too:
bosch-4.9d.pdf

LSU49_D.pdF

[f00dstamps]

Originally Posted by robnitro

During warmup you can see a really low AFR, especially if you left the throttle plate in - it pulls a -1 -2 psi vacuum for the post injections. So, leave out warmup and any tiny spikes.. steady state WOT , what is the lowest AFR that you see?

With TDI guys who run mafless, but map/speed density tunes there is low afr- big smoke on hard acceleration /transient throttle in low gears because of high EMP- vanes closed. Higher gears need less vanes closed- less EMP, so the map/rpm calculation is close to ideal.
That could be part of the issue if you got mafless.

If not mafless, maybe they made it "performance response", for extra smoke and temporarily low afr, you can get smoke to "help spool" the turbos. I put a lot in quotes cause if you compare a well done tune with one that does that, it's almost not a big deal to have a tiny bit of lag to not have to roll coal.
Only on trucks I saw that the single turbos that lag get a lot of help from rolling coal, and those guys upgrade to compound a lot. But a VW vnt, or BMW compound+vnt... why roll coal? It's either lazy or just like DWR said, they bypass some diags... so pretty much not much different than the TDI tuning which was highly valued.

A small story too, guy moved to germany. His highly rated (for here lol) tune failed TUV. He had some german tuner retune it, almost the same power but passed their strict testing!

Im not sure if there is a difference between the tuners here. Honestly, I have a friend who is trying to convince me to do it via galletto... If my dpf starts being a jerk, I will jump!

Robnitro - I appreciate all the information you have been giving me. I took a closer look at the data, the log record 1 reading per second and on a run from 64-90mph, I record 14.66 AFR. I also recorded 13.23 during a 1 second full throttle situation where I backed off because the other guy didn't go.

[robnitro]

Originally Posted by Yozh

Log voltage at your O2 sensor and see what it reports at rich.

Also, a curious thing to note that OEM BMW used a straight LSU4.9, where a diesel specific LSU4.9D is more appropriate, resistant to soot and works quite well. Bosch part number 17466

Interesting so with time, soot would the o2 sensor read less oxygen? In that case there would be less power and less smoke as it soots up.



Foodstamps 14.66 afr constant? I'm not sure what afr is smoky on our diesels. On the tdi with less injection pressure, 14.6 would be like a James Bond smoke screen lol

[f00dstamps]

Originally Posted by robnitro

Interesting so with time, soot would the o2 sensor read less oxygen? In that case there would be less power and less smoke as it soots up.



Foodstamps 14.66 afr constant? I'm not sure what afr is smoky on our diesels. On the tdi with less injection pressure, 14.6 would be like a James Bond smoke screen lol

Robnitro - I need to do some more logging and reduce the measurements I am taking so I can increase the sampling from 1 Hz up to 5 Hz. It appears the AFR measurement dips down to 14.66 on full throttle application and then backs off to 16+ in the second afterwards. What's curious to me is at what temperature would the soot burn off? I am measuring EGT values as high as 800F when getting on it.

[robnitro]

16 is clean, Iirc on my tdi 16.5 was barely a haze

Does the 35d have a diagnostic for injector balance like the vw TDI has?

Also what is the peak rail pressure? Tdiwyse found that at a certain level the cp3 ip relief valve drops pressure. But because it was on a running box which lies about rail pressure, we couldn't see the real limit but it's probably a bit above 1800 bar.

On torque running less pids, inputs gives better sample time for each reading. Some pids are based on the same reading, as duplicates they don't count (like my crazy maf ones, lol)

[_TB_]

I tried the PID's for my 325d - but most of them are not giving me any data.

Do the 325d have other PID's - or does the dde not broadcast them?

[DWR]

Originally Posted by _TB_

I tried the PID's for my 325d - but most of them are not giving me any data.

Do the 325d have other PID's - or does the dde not broadcast them?

OBDII PIDs are the same. BMW PID are specific for the DDE. You can use Toolset32 or Testo to find PIDs for your DDE.

[Smee]

hello

will these pids work for my f32 435D?

[Smee]

Originally Posted by DWR

OBDII PIDs are the same. BMW PID are specific for the DDE. You can use Toolset32 or Testo to find PIDs for your DDE.

i know how tool32 how do i work out what PID's to use

[DWR]

Originally Posted by Smee

i know how tool32 how do i work out what PID's to use

You will be searching for a table that contains results with OBD in the name.
Reference the Excel sheet I provided earlier in the thread. That should give you an idea of what you might find. I only support the 335d, but good luck!

[Smee]

Originally Posted by DWR

You will be searching for a table that contains results with OBD in the name.
Reference the Excel sheet I provided earlier in the thread. That should give you an idea of what you might find. I only support the 335d, but good luck!

no worries is the e90 and f3x the same engine.

i have a 435d which i think is the same engine

what is confusing me is fuel rail pressure sensor isnt working on Torque Pro but is on Dash Commander. also on torque my boost is maxing out at 22.5 psi is that normal

[_TB_]

Originally Posted by Smee

no worries is the e90 and f3x the same engine.

i have a 435d which i think is the same engine

what is confusing me is fuel rail pressure sensor isnt working on Torque Pro but is on Dash Commander. also on torque my boost is maxing out at 22.5 psi is that normal

Funny i have The same Max boost in torque.. 325d

[Torqu3]

Originally Posted by Smee

no worries is the e90 and f3x the same engine.

i have a 435d which i think is the same engine

what is confusing me is fuel rail pressure sensor isnt working on Torque Pro but is on Dash Commander. also on torque my boost is maxing out at 22.5 psi is that normal

Originally Posted by _TB_

Funny i have The same Max boost in torque.. 325d

In Torque I know you have to specify the fuel type in the settings. Apparently this makes a difference. I'm pretty sure my 335d has 28psi max boost. Can't recall for sure though.

[2011335d]

Originally Posted by Smee

no worries is the e90 and f3x the same engine.

i have a 435d which i think is the same engine

what is confusing me is fuel rail pressure sensor isnt working on Torque Pro but is on Dash Commander. also on torque my boost is maxing out at 22.5 psi is that normal

Torque and the PID spreadsheet mine shows 24.5psi max on a highway run to 80mph.

did a 0-50 mph run and i only had 20psi max in the lower gears. In 1st or 2nd it only showed 10-15psi. did clime to 20psi until it shifted. since I was in D not sure if it was 2nd or 3rd gear when it made it to 20psi.

I find it weird that car doesn't make higher boost in the 0-30 mph range

[robnitro]

1 st gear is harder to build boost because rpm climbs faster than the turbo can spool up. Same thing happened on vw tdi.

[ASBSECU E93]

Ok - I've created the custom PID's in the torque App during a 3 hour long meeting this morning....

I'll test these on the way home tonight.

[ASBSECU E93]

Ok.....not all of the PID's are working....

[TDIwyse]

Originally Posted by ASBSECU E93

Ok.....not all of the PID's are working....

Hand entering the equations enables lots of opportunities to miss the exact operator precedence (things like "(" or ")"). If things aren't exactly correct, it's very likely they won't give a result.

[ASBSECU E93]

Originally Posted by TDIwyse

Hand entering the equations enables lots of opportunities to miss the exact operator precedence (things like "(" or ")"). If things aren't exactly correct, it's very likely they won't give a result.

Yea - I'm checking my math.