Hi,

I am trying to tune the spark tables in the "apyp" bin file commonly on the internet. It is a stock 89 bin I think.

Anyway, the main spark table in most cars I have tuned is rpm vs load (airflow/rpm). Is it the same in this bin file?

The numbers for "load" are 32 48 64 80 96 112 128 144 160 176 192 208. Any idea what these numbers are?

Under a typical full throttle run, what path gets used?

The car feels dead at full throttle right now and I think the timing is too conservative. AFR is good 12-13

TIA

 

Yes.

Quote:

The numbers for "load" are 32 48 64 80 96 112 128 144 160 176 192 208. Any idea what these numbers are?

Load variable, or LV8 for short.

Quote:

Under a typical full throttle run, what path gets used?

The one your car is kept pointed to.

Quote:

The car feels dead at full throttle right now and I think the timing is too conservative. AFR is good 12-13

TIA

OK, your welcome,

RBob.

 

"The one your car is kept pointed to"

What does this mean? What are the units of LV8? Is there any way to know what values I should change in the map to effect full throttle? If the numbers somehow can be converted to mass air/rpm then maybe I can datalog these and know where to make changes.

Does that better explain the question/?

 

It's humor. car ---> path --> goes where it's pointed (steering wheel, not LV8).

LV8 will act like a MAP value, but not quite. At wide open throttle, LV8 will go high at low RPMs and taper back as RPMs climb. On a MAP system, the high MAP columns can typically be assumed to be WOT, but on a LV8 table, the WOT LV8 doesn't stay always at the high LV8 values. LV8 for spark isn't really an easy or intuitive way to calibrate spark, IMO, but not really optional for you.
You'll have to datalog a little to see which LV8 values are hit at each RPM breakpoint.

LV8 is directly dependant on airflow, just with RPM in there to try to straighten out a mostly diagonal curve.

 

path, i see

Based on your suggestions it sounds like I need to datalog airflow, map, and rpm, and see if I can approximate for LV8.

Thanks , I will try this.

 

Sorry, there's no MAP on these MAF cars. I was just comparing LV8 to MAP.
Yeah, basically, if you want to know which part of any table is used, you have to log the x and y axis, and also any other enabling criteria or flags, and/or learn the algorithms well.