Guys....I am just sorta going through some stuff in TunerPro...really just the constants and trying to identify the differences between these bins as I am learning this stuff. For the most part they look very similar with some differences....can anyone provide me with some insight into what the following means/what the difference in the #'s represents...Keep in mind I am just learning this stuff.


Max rpm for Slope SA: 4000 in ANTT vs 4800 in ANLU....what does this difference mean...and in simplistic terms what does the effect?

Slope Added spark deg/1000rpm: 8.02 in ANTT vs 3.52 in ANLU....what does this difference mean...and in simplistic terms what does the effect?

BLM enable min MAP Threshold.....13.35 in ANTT vs 17.78 in ANTTwhat does this difference mean...and in simplistic terms what does the effect?

Any help/guidance guys.....I am just trying to understand what the differences are between these two bins with respect to these constants I identified in TunerPro.

Dave

 

I'm not much of an assembly reader....

But here is the code I found.

SA Slope adder, I really can't read much, other than it looks like it in non PE cases, it adds the the ammount of the constant, per 1k RPMs, up to the max RPM threshold. But what confuses me, is the start of slope at 3600 RPM, Now I'm very interested, hopefully RBob, demented, or Jon will speak up here. Since I the actualy math on the others is not commented.

So in reality, I am not much more help than posting the code.

 

Here is the code for the BLM Enable thresholds.

I assume this is so it does not try to correct the BLMs below that MAP value. I don't know if this is for the descel enlean, or for idle purposes. But changing that might have some benifits with some large cams, so you can run without BLM corrections under a certain map value. It would def. take some driving and dataloging before I would change that value.

Hopefully someone who understands this better than I do, will speak up.

 

The first half of the posted code is just to check the bounds before the slope SA is performed. Above 3600 rpm, additional spark is added. The ammount of spark is the degrees per 1000 rpm x (present rpms - 3600 rpm). The 4000 rpm value is teh upper limit on the rpms used in the calc. Above that, the rpms are limited to 4000 to stop more SA from being added. At or below 3600 rpm, the calc isnt performed and its skipped. From 3600+ - 4000 rpm, 3600 rpms are subtracted out and the remainder is multiplied by the slope added SA constant and divided by 256. This is then added into the SA from the main table. I cant see the rest of the code but I *think* the slope SA may be performed all the time when the rpms are within range.

 

I think thats pretty much all that is.

 

I looked at it again. It does apear that it adds that advance at all times. It is during the total SA loop, and if PE is reached, it adds the PE advance on top of that. It looks like it is in the same loops as when it figures in coolent compensation, and TCC lock-up comp, etc.

 

In my setup, I disabled the slope SA all together. The main spark table goes up to 3600 rpm and I don't see a need for more advance at 4000 or 4200 than at 3600. I just set my spark table to ramp up nice and I think it peaks at like 28* at 3200 and stays at that up to 3600. Then disabling the Slope SA will just keep me at 28* for however far I rev the engine.

Do you guys really think its necessary to have it slope in more SA after 3600 if you map out a good main spark table?

 

Owch...my head...and I thought my 1 & 2nd year statistics courses in university were complex...lol. Ok...once i slowed this down I think I "sort of" understand the SA constant varables based off some of your guys commentary etc....but those tables Dewey posed....I dont understand those at all (which is fine..I am just learning)

1) Max RPM for Slope SA: this is the maximum RPM up to which this SA will be added...correct? So in the One BIN its 4000 and the other is 4800...after that rpm is reached it does not add any more spark advance.....correct?

2) Slope Added Spark Deg/1000 rpm: This is the amount of spark which is added/1000 rpm...and it is only added up until the max rpm....over 3600 rpm...correct? Is the reason why it is programmed to add more spark is because above 3600 the ECM goes into PE mode and dumps more fuel/air...so it needs more spark to fully ignite???

I think I sort of understand these SA fields....so the main diff between the ANTT and ANLU is that in the ANLU Spark is added up until 4800 rpm and at a lesser rate than ANTT.

Seem like I am on the right track to understanding these guys based off your guidance? Thanks again.

D

 

It will slope the SA up from the man, to the max. above the max threshold, it will use the advance of the max RPM. so it doesn't just effec the 3600-4800 rpm range, it effects the 3600rpm+ range. It also looks like it is based on an offset RPM.

So in ANTT for example.

At 4000 RPM the slope added SA is

4000 - 3600 = 400

400/1000 = .4

.4 * 8.02 = 3.2* of advance.

So the SA will slope from 0* - 3.2* between 3600 and 4k, from 4k on it will add 3.2* to whatever cell it is looking up given the conditions.


Clear as mud?

 

Nice....thanks Dewey....that aspect seems fairly clear to me now.....perfect (1 area down.....50 million more to go...lol)

But I guess the only thing is that without a WB OT sensor you cant really datalog at those higher RPM's so any adjustments to those SA nubmers in the constants has to be strictly done by the seat of the pants...

D

 

well,

You can output the total SA in the ALDL stream. Use that, in combination with tracktimes, dyno, g-tech, etc.

You need several tools to properly tune, a WB, and dataloging are just two of them.

 

Tanager, just wanted to point out one thing. You mentioned something about PE mode and when it comes on. It doesn't just come on after 3600 rpm. There is a table in the bin for at what TPS% to enable PE mode. I believe in a stock bin every TPS setting is 50%, so any time you hit 50% throttle you will enter PE mode. And the other axis of the table is RPM, so you can change the TPS% at certain RPM values if you want PE mode to come on faster or later.