B0720-fuel pulse

[killerbee]

ok, I am confused. B0720 is the fuel pulse table. But it doesn't makes sense. In the LMM, compared to LBZ and LLY, this table has values that are entirely too large. Logs do not follow this table either.

This shows 55 mpa, 800 us, and 25mm^3. Not a valid pulse chart value.

Has anyone made sense of this?

[camcojb]

My logs show the same. The only numbers that seem to line up are the full mpa and mm3 areas of the map, bottom right hand corner, in other words full throttle stuff.

Jody

[killerbee]

The LMM table values just don't make sense for a stock table. If I am the first to post this discrepancy, it needs a close look, because this is the basic stuff.

All other model pulse tables make sense, this one is way out there.

Or I am missing something, and am about to be embarrassed.

[abkimble]

LMM's show total pw then remove that of pilot and multipliers. Looks right to me. Without looking at the rest of the tune that is.

[killerbee]

That doesn't make sense either. The log shows 800 us main and 312 us pilot. 1100 total. The total on the table is 1800 after interpolation.

what multipliers?

[abkimble]

That doesn't make sense either. The log shows 800 us main and 312 us pilot. 1100 total. The total on the table is 1800 after interpolation.

what multipliers?

I get roughly 1882 ( edited * didn't read picture close enough at first * ) after all the math from just what you have posted. Post the tune so we can investigate further.

[killerbee]

any stock LMM tune.

so i guess I am not getting it. What math?

[abkimble]

So post the stock tune you are reporting.

As far as the math, all the pilots have to be considered. If this is a stock tune and a log of the stock tune..... Then this math would follow and you get exactly 1811.45pw. All this table says is, it takes an 1811.45 pw to get 25.9mm3 fuel at 55mpa All other injection times on and off for each of the injections have to be considered. If say post injection is removed that pw command will not change it will only be added to a different injection pw unless some limiter is set. And so on. Post the tune for further investigation.

[camcojb]

So post the stock tune you are reporting.

As far as the math, all the pilots have to be considered. If this is a stock tune and a log of the stock tune..... Then this math would follow and you get exactly 1891pw. All this table says is, it takes an 1891 pw to get 25mm3 fuel at 55mpa All other injection times on and off for each of the injections have to be considered. If say post injection is removed that pw command will not change it will only be added to a different injection pw unless some limiter is set. And so on. Post the tune for further investigation.

I have the same question. Table B0720 for the LMM's is described as main pulse only, no pilots like the LBZ's. On mine there is only pilot 1 at a cruise, say 40-50 mph, no pilot 2 or 3, no post injections. Even if you add the main and pilot 1 it isn't close to what the table shows it should be for the fuel pressure and mm3.

What "math" are you using?

Jody

[abkimble]

I have the same question. Table B0720 for the LMM's is described as main pulse only, no pilots like the LBZ's. On mine there is only pilot 1 at a cruise, say 40-50 mph, no pilot 2 or 3, no post injections. Even if you add the main and pilot 1 it isn't close to what the table shows it should be for the fuel pressure and mm3.

What "math" are you using?

Jody

Ok so post your tune also with a log.