So. Talk to me about this new "SOI offset".

[Power Hungry]

Cody,

Those values were a boo boo. I'll get you new definitions today. Sorry about that. Only the TOAA and VKAE definitions were affected. The VDAB0 is fine.

[cleatus12r]

Originally Posted by Power Hungry

Cody,

Those values were a boo boo. I'll get you new definitions today. Sorry about that. Only the TOAA and VKAE definitions were affected. The VDAB0 is fine.

I noticed that the VDAB0 was still OK.

I am not upset, just kind of curious why I ended up with a VDAB0 instead of an FM20P402 and a VKAE3Q3 instead of VKAE4P8. The VDAB0 definition is not really that big of a deal since all of my existing ALF6 binary is totally supported in the VDAB0 definition anyway. However, I had to transfer all of my ZHL1 stuff to the VXY2 family. I got it taken care of though so no worries!

Any word on the VIAF3G4?

Thanks Bill. Good thing I didn't understand what was happening with the "new" (boo boo'd) offset. I'm glad I asked.

Hope you had a very merry Christmas!

[soutthpaw]

I am still trying to see the benefit of a SOI offest as changing a global parameter.. I can see the benefit in live tuning for being able to shift the whole SOI a couple of degrees esp when working at elevation. But there seems to be much better ways to set the SOI..such as with the Injection delay map.... when we say delay are we talking retarding the SOI. where as the SOI offset would advance it??? can u use negative values in that setting delay

[cleatus12r]

Sorry for the confusion, DJ. The maps are THE SAME MAP. It just so happens that I was confused since I have definitons that have it listed as either one and that the new ones that are listed as "offset" do not contain correct information.

The MAIN advantage to using the SOI Delay map is the fact that the SOI can be changed based on engine oil temperature. A side benefit (or detriment) is that it is an indirect way of getting a greater SOI advance at higher RPM.

[cleatus12r]

Originally Posted by soutthpaw

when we say delay are we talking retarding the SOI. where as the SOI offset would advance it??? can u use negative values in that setting delay

The "delay" is a calculated value that the PCM uses to get the injection timing just right. The injectors do not begin spraying as soon as the PCM tells the IDM to do it. There are electronic, and more importantly, mechanical delays (as well as oil viscosity) that would cause a retarded injection event if there wasn't a compensation.

The "delay" values cause the PCM to anticipate for the injectors' inherent delay.

I wouldn't know about the negative values in the map. I would have to guess that you'd end up with some severe white smoke all else being the same.

[soutthpaw]

Just got done doing an oil change on my truck... with synthetic so it will be good to go when we get back to CO in Jan for the rest of the winter... Noticed a big dent it my steering stabilizer but took it off to check and it still works... anyway, Under parameters there is a SOI offset too though....

so the Delay map is actually giving the PCM an estimate of the time between commanding SOI and the actual physical event taking place??? is that correct?? I don't plan on messing with that though as I think I can accomplish what I want keeping things a bit more basic...

[cleatus12r]

Originally Posted by soutthpaw

so the Delay map is actually giving the PCM an estimate of the time between commanding SOI and the actual physical event taking place??? is that correct??

Yessir!

[cleatus12r]

Originally Posted by soutthpaw

Under parameters there is a SOI offset too though....

If it's the one near the top that says "global offset", then that parameter takes whatever calculation for SOI that is made and automatically adds or subtracts that value across the board.

Say with all of the calculated SOI maps you would end up with 26.5 degrees of SOI BTDC at a certain operating condition. If you put a "-5" in the global offset parameter, then the PCM will tell the IDM to fire an injector at 21.5 degrees. Same if you put in a "2"; you'd end up with 28.5 degrees.

[Power Hungry]

That's it exactly.