PDA

View Full Version : B0729 table doesn't function correctly



lakingslayer
January 15th, 2008, 12:40 PM
I have DSP5 installed on my truck and I got on the throttle this morning while my truck was at about 127deg F. My fuel volume for WOT is set to 100mm^3. I have the B0729 table set to 60mm^3 over the whole table. The B0730 table is set to 162deg F. Since the ECT was below 162deg F. I figured I should only see a max of 60mm^3 or so of fuel. I saw 99.9mm^3 on the FUELQ_THR_DMA and 98.6mm^3 on the MAIN_DMA PIDs. Am I wrong or should this table limit the fuel volume for all DSP positions to 60mm^3 until the ECT reaches 162deg F?

TIA.

BTW I'm running 7.5.3 with the latest Calibration files that include the idle timing tables and I am beta testing the V2 hardware and have the Jan 07, 2008 updates installed.

lakingslayer
January 30th, 2008, 02:39 AM
I finally logged my stock OS yesterday and noticed that when I hammered it at 111deg F with a fuel limit of 50mm3 until 162deg F the fuel hit 80mm3 and slowly ramped itself down to 52mm3 under 100% throttle. Now I need to do the same thing again with the DSP5 OS but I'm thinking it will work the same way. I just never logged a WOT long enough to see if the fuel limiting would catch up.

lakingslayer
February 5th, 2008, 02:45 PM
After looking at some more logs I found that the ECM limits Rail Pressure while the ECT is below a certain temp. If the table demands 160Mpa then when the ECT is below 130deg F I get a max of 136Mpa. I'm not sure what temp it kicks back up to 160Mpa but it does register 160Mpa at 185deg F. This is true in both the Stock OS and the DSP5 OS.

Also I found that the DSP5 does not limit the B0729 table below the 162deg F set temp. I get a 92mm3 when I should only be getting 50mm3. Stock OS seems to limit the volume to 52mm3.

I think it's a good idea to be able to limit the amount of fuel injected below a certain temp and was wondering if this could be looked at.

joecar
February 6th, 2008, 04:05 AM
I pm'd Tech Support.

lakingslayer
February 9th, 2008, 02:20 PM
I pm'd Tech Support.
Thanks!