I did find some of the corresponding tables in my ROM. A few months ago, I started looking at the algorithms associated with these tables, and my intitial conclusion on the post primer map is that it wasn't meant to be used for that purpose, although apprarently it does work in that fashion. I haven't gotten to the decay maps yet. I need to look at it again before I can be sure. These maps are next on my list after I finish up with what I can on the ISCV control system.

 

Which tables do you have, and which ones are you missing?

 

I do not understand why you'd increase the values with larger injectors while using pump gas. The way I'm thinking about things, the value should to lowered since the injectors are flowing more fuel. Please let me know if my thinking has served me wrong!

Should the formula instead be: new startup IPW value = (old startup IPW value)*[513/(current injector scaling)]

 

When your running E85 and (in my example 1190cc/min injectors) I still have to add fuel to start the car.

 

You're exactly correct. I rushed too fast on that formula. Updating that post now.

As a side note, the values at cold temps 7C and below need to increase substantially for E85.

 

Great, thanks! Just wanted to clarify Also, do you think its important to use the scaled injector values (example: 513 scaling) rather than actual injector flow (example: 560cc)?

 

Just need to be consistent, so if you are using the ECU scaling of the new injector, then use the ECU scaling of the old injector. Or if you are using the advertised scaling of the new injector, then use the advertised scaling of the old injector. I recommend using the ECU scaled values because this is going to be more accurate than the advertised value.

 

I have been deciphering this and the Coolant temperature AFR adder for 88590015
is in subroutine 17F46, tables in concern are 3190,3180,3170,3160,3150,3140. they are used depending on various conditions (mrfred maybe can decipher it further). Value of AFR adder is then stored in FFFF6CB6. It is kind of complicated routine as interpolation is done with Post_Primer_Decay_Weight_Factor, there are checks of Coolant temperature, Idle e.t.c.

 

Just thought I would post a screen shot of my settings that seem to be working better than the richer settings I was using previously. I used the following equation in the thread to get my values: new startup IPW value = (old startup IPW value)*[513/(current injector scaling)] . I used 1125 as my current injector scaling, even though I have them scaled to 1083.

For reference, my car has a mini battery (2yrs. old) & FIC 1150's and the weather was touching -20F to -30F the last couple of days. My car sat all day at the train station and I was surprised it even started considering it was out for ~12 hours today. This is pump gas as I don't want to mess w/ the E85 in the frigid weather.

ROM 94170015 (Left is stock / Right is modified)

 

Has anyone found these tables for 96420007/96420008?

 

I just wanted to update the thread that my car has now been starting easy in negative temperatures here in Chicago, and the phenomenon I saw that one night of my a/f numbers being rich was a fluke. Everything looks good now.

Thanks guys!

 

Along these same lines... with the injector scaling for E85 aren't we already adding that 1.3 multiplier in by using newval/old val? IE: Arent E85 injector scalings already ~(scaling x 1.3)? I know for the much colder stuff you still need to add more, but that might help some people with warm/hot start problems.

Also... gearing this one toward tephra. Instead of doing multiple/alternate startup IPW values in the next release, why not just hard-code in a formula? It provides less tweakability, but also is one less thing to remember. You could also do it based off of the initial settings so that we could add or subtract some from the initial values but still have the overall switch be automatic!

 

Anybody find the addresses for 94170015?

With these two other values I've got 10 startup/post start maps for 94170015 that I would like to post up. It's mostly the same maps posted in here, just slightly more organized. I would like to get these last two before posting up so that it's all together though.

 

The startup enrichment values are not affected by changes to the injector scaling, so they need to be adjusted in the same way that injector scaling needs to be changed.

 

Right, I'm just saying that it seems like the equation that you are using (based on injector scaling) already factors in the extra 30% fuel that you need based on the fact that you are "undersizing" your scaling for your injector size by ~30% already. So 30% more fuel via scaling + using scaling based equation = already properly sized startup IPW if using scaling based equation. (yes you would still need to multiply by 1.3 if you were using physical injector flow rates).

So, there should be only one equation as:
Agreed?

Sorry if I'm clear as mud....