INJPDELTA_DMA measurable range in N/A and boosted E67

[scdyne]

I have a N/A E67 OS(12610013) and was comparing it with a boosted E67 from a CTS-V OS(12639469).
In relation to B4001 or any table that uses INJPDELTA_DMA my N/A E67 only measures down to 400 kpa for INJPDELTA_DMA.
Now it's obvious that this is because an N/A can't possibly see less than 400 kpa because the most it can see in manifold pressure is atmospheric.
BUT with the CTS-V it could in theory go all the way down to the bottom of the measurable scale of 128 kpa as it's a boosted engine and the manifold pressure can be many times that of atmospheric.

So a few questions I have that are related to this are a follows:
1. What is the minimum measured INJPDELTA_DMA someone has logged on a factory boosted E67? Lower then 400 kpa?
2. What is the correct scaling for B4001 for E67 12610013? Mine shows 128-640 @ 16 kpa resolution and the 12639469 is 128-720 @ 20 kpa resolution
3. Can the OS I have be calibrated in such a way as to enable INJPDELTA_DMA to measure below 400 kpa?
4. Can the E67 series have negative values in B1204? The obvious answer is yes, but I haven't personally seen one and wanted to make sure it was acceptable..
- In that one could just set B1201 to 4.00 ms and leave EVERYTHING below 4.00 ms to be defined in B1204.
- OR use B1204 to bend B1201 from the knee to 0 in the area where small pulse is not linear.

[joecar]

Check the maximum allowed flowrate:
- 12610013: B4001 range 128-640 kPa by 16 kPa -> maximum flowrate is 8 g/s
- 12639469: B4001 range 128-720 kPa by 20 kPa -> maximum flowrate is 16 g/s

Yes, boost is INJDELTA going below 400 kPa (approx 100 kPa per bar or boost).

Post your tune file.

[scdyne]

Duh! :doh: Drawing myself a picture.. :doh: What is the Maximum flowrate value you can put in the value fields for B4001? According to EFILive it's 7.999_ for OS 12610013 and 15.9999_ for OS 12639469. As stated numerous times 8 g/s = 16 kPa and 16 g/s = 20 kPa. For some reason (It gets really moronic when you think about it) I didn't connect the Units: Minimum: and Maximum: for each table was where the 8 g/s value was coming from. Yet I was able to comprehend that I could use negative values as stated in question 4 as it's shown to go from -256 to +256. For some reason I was thinking that was all arbitrary.

So with the larger injectors I'm running now I would really like to be able to take advantage of the full range of B4001 so when I hit boost the injectors will adjust for the real Delta P across the injectors based on the Injector Flow Base and not just flat line at 400 kpa.

I have seen tunes that do everything from hack the MAF table to editing B0148 Open loop fuel load multiplier.

I know what people do and with a centrifugal S/C that has boost linked to RPM it's very easy to fake it, but I wanted to do it right if possible.


13418

[joecar]

That is exactly how B4001 is to be used... :cheers: ...by correctly setting B4001 no fudging/hacking/faking/jacking is required.


The B4001 table in your file covers non-boost (range 400-480 kPa), for boost you would have to extend it down below 400 kPa (by 100 kPa per 1 bar of boost).

So with 2-bar boost (requiring a 3-bar MAP sensor) you would need to define B4001 down to 200 kPa (208 kPa being the closest).

[joecar]

Yes, you can make B1204 negative, this would help large injectors at idle.

[scdyne]

The problem I have is that when I log INJPDELTA_DMA it clamps at 400 kPa as soon as I get into boost. I have a 2 bar map sensor and arguably correct settings for it so I wonder if there is some other setting that needs to be configured to get it to go past the clamped 400 kPa.

13420

[joecar]

Can you locate some factory boosted tune files to look at and compare with, I'm curious about this...

[scdyne]

holdencrazy has a few stock CST-V files for E67 which is where it spawned this thought process. Since the OS is different I can't really get them to do a compare in EFILive. I haven't had the free time to do a manual compare.. Since the boosted kappa uses a different Bosch ECU there is no reliable comparison.

[scdyne]

Would someone be so kind as to post a log of INJPDELTA_DMA from a boosted E67 showing it go lower than 400kPa when it enters boost.