Has anyone ever noticed any descrepancies in Datamaster logs with respect to Fuel (BLM) Cell numbers? I reset my boundaries to 1200/1600/2500 rpm and 45/65/85 kpa. I have found, in multiple places, where the cell number that is reported in my Datamaster logs does not coincide with the rpm and map for that same record. I have accounted for the stock program BLM cell boundary hysteresis of 2 kpa or 100 rpm and things still don't add up. Has anyone else ever seen this? BTW, I'm using the cell table as found on LJ's site: http://para.noid.org/~lj/

TIA,
RobY
95Z28

 

I have noticed the same in my logs. I log with Autotap. Only very few of the data lines show blm cell numbers not corresponding to the map and rpm values they are supposed to have. I assume this is due to the time interval inherent to the sampling process. While driving under changing conditions this can happen.

 

I asked the people at DataMaster about this. I even showed them my file. They didn't know.

Jeff D.

 

Try a "search".... I think this topic has been discussed before, and I thought it was a response from TTS that indicated that DataMaster divided the grid up differently, and assigned different cell numbers... could be wrong but I thought it had been posted before.

 

Yes as Injuneer said do a search, but the bottom line is Datamaster has NO idea what you put your boundaries at. it is just using predetermined locations as hard coded in its software. It can only read outputs, not get into your PCM and analyze it. That is the work of TC or LT1E.

 

I tried a search before posting this and didn't turn up anything. Maybe I'll give it another shot with a little more dedication, based on your input.

My initial thought was this would be a PCM issue and not a Datamaster one.....it was my assumption that Datamaster was just reporting what the PCM was supplying, not calculating the fuel cell number. Is that not the case?

Thanks,

 

My initial thought was this would be a PCM issue and not a Datamaster one.....it was my assumption that Datamaster was just reporting what the PCM was supplying, not calculating the fuel cell number. Are we saying the same thing?

 

Just thought I'd follow up on this.....turns out I'M the one with the issue! I was reading the wrong log file! When I read the correct log file, things made much more sense. With that said, there were a few erroneous records, but I'll attribute those to transition timing. IIRC, the number of erroneous records was around 0.5% of the total. Negligible in my mind.

RobY
95Z28

 

Just a question but to what benifit do you change these values? Would it help with a cammed car to get better blm control?

 

Yes, potentially. In my case, once I went with a larger cam, the PCM was only using 9-10 of the 16 available part-throtte BLM cells. Readjusting the boundaries will allow use of all 16 and better fuel control.

RobY
95Z28