Cascade Crew

91RSVert · Posted: Wed Dec 12, 2007 10:51 am Post subject: ghetto style main ve adjusting

Ok, I'm using a different pcm system then most people here, but some of the ideas behind it are mostly the same. So thats why I'm posting, help on the board for the program blows.

The program has whats called an "auto ve" function, but you have to have a WB-O2 and disable your MAF. I have a maf, and dont have wbo2 so that was out. Playing around I found I can still log option "kpa", "rpm", "bank 1 %", and "bank 2%" and export to excel. Your asking, what are these % things. Well, its telling me the pcm is trying to correct that much to achieve 14.68 fuel ratio.

So I log this, export. Divide them up by rpm range... 600-1000(for 800), 1000-1400(for 1200), etc. Then sort that group by kpa. Then I looked at it, averaged out the %'s at xx kpa and xx rpm. Adjusted.

Below are before n afters, then a smoothing. Anyone got some helpful input since I cant do it the right way?

oo Travis, I do get 0% afr's at times Embarassed

before (attempted to put in an 89 L98 fuel chart)
http://img252.imageshack.us/img252/9195/mainve14vt1.jpg

after
http://img249.imageshack.us/img249/6038/mainve15ix2.jpg

Dewey316 · Posted: Wed Dec 12, 2007 10:58 am Post subject:

Looking at a VE table isn't a lot of help, it looks like a TPI table though, with that stupid ridge. Wink

The key is in the results, no matter what the table looks like. How are your o2 readings, and drivabilty.

FWIW, I prefer to do the spark table first, then get my VE table second, and just get it to run stoich.

--john

91RSVert · Posted: Wed Dec 12, 2007 11:07 am Post subject:

I thought it looked kinda "flat" except for that one spike Confused

compared to some of the other ones I see on the board for the program.(mostly ls1 cars)

Havent loaded the setup yet, so unsure of the results. I figure I will have to do this a few times and slowly "tweak" it.

I'm more concerned with economy and driveabilty rather then hp. But would like a round-about both. So far, even running pig rich, it runs better then what setup was on the car. Twisted Evil

Dewey316 · Posted: Wed Dec 12, 2007 11:15 am Post subject:

luckily really the 90-100KPa cells are the only ones in use at WOT, so tuning for both power, and driveability should be the goal. Try to get evertyhing below 80KPa, to give you .450v feedback on your o2. Then tune for power above 80KPa, that should give you the ideal setup.

Can you post your spark tables, a good spark table will do more for drivability and milage then the VE tables will.

--John

91RSVert · Posted: Wed Dec 12, 2007 11:30 am Post subject:

I can post them later, I dont have that at work with me. I have read it is very conservative(sp?).

I was going to get it to quit throwing a rich code, then tackle spark and 2 other issues I have.
1. It sticks on fast rpm when I push in on the clutch.
2. Surging at low rpm in first gear.

I think 1 is because I am on a automatic tune, I am a standard. No standard shift tune is made.
I think 2 is because my cam has some lope in it, and thats when its loping.

blue89 · Posted: Wed Dec 12, 2007 1:23 pm Post subject:

You've mentioned before that you increase the spark advance until it leans out?

How do you tune for mileage?

91RSVert · Posted: Wed Dec 12, 2007 2:59 pm Post subject:

sparkys. I tryed to do the actual numbers, but not all of it would fit on a screen.

main
http://img100.imageshack.us/img100/1124/mainsparklo7.jpg

backup
http://img142.imageshack.us/img142/8420/backupsparkyf5.jpg

I havent loaded them yet. If you tell me some adjustments, I can give it a try yet.

Dewey316 · Posted: Wed Dec 12, 2007 4:47 pm Post subject:

They look awful conservative. I like to ramp it up to about 2500 rpm at WOT, and then keep it about 30-34 from 2500 on.

91RSVert · Posted: Wed Dec 12, 2007 6:18 pm Post subject:

So your saying add about 7 across the whole board?

I'm still new to this stuff.

:edit: Just found a 91 L98 timing chart. Some areas is more agressive, some areas its less Confused

Think I should plug in the higher of either one and see what she does? Shrug

Dewey316 · Posted: Wed Dec 12, 2007 9:02 pm Post subject:

Here is how mine looks.

100kpa is on the far right.

91RSVert · Posted: Thu Dec 13, 2007 7:08 pm Post subject:

Thats a fairly smooth spark table. Even the stock L98 one I pulled up was wavier then that.

Ran my new fuel chart tonight. Fixed the sputter I had in high 4th gear. Still got a check engine light when I got on the interstate and kept in it. I suspect its that spike at 3800@70+kpa.

Fixing to merge spark tables and check my fuel again. Very Happy

Twilightoptics · Posted: Thu Dec 13, 2007 7:29 pm Post subject:

Stock spark tables are WACKY!!!!!!!!!!!!!!!!!!!!!!!

91RSVert · Posted: Fri Dec 14, 2007 6:32 pm Post subject:

Just took it for a spin (litterly) with a new fuel, new spark, new idle air setting.

Fuel
http://img259.imageshack.us/img259/9615/mainve16qk4.jpg

Spark
http://img254.imageshack.us/img254/8743/mainspark16zk0.jpg

Although it was in the rain and I was sliding everywhere. Seemed to be alot snappier on the throttle. Didnt seem to have quite the low end grunt, but had alot more zip to it.

Did get some knock in the mid 2500 range, and some small in the 3k range. I am really surprised it took that much more spark! All this on 87oct too!! Not the good 93.

Dewey316 · Posted: Sat Dec 15, 2007 11:11 am Post subject:

For some reason that spark table still looks funky. I don't have a bin with tunerpro on this computer, maybe Paul will post the numbers or the graph from his spark table. What is the actualy ammout of advance you are running when you get the knock?

91RSVert · Posted: Sat Dec 15, 2007 1:33 pm Post subject:

It was in the low 30deg area where I got the knock.

I was waiting on it to dry up today, but thats not going to happen. Tommorow I am starting to take the manifolds off for headers. So its looking like tell after x-mas before I can mess with it again.

Debating on drawing a graph out, and marking where I get spark, and then write in that block "max spark" then start working my way out from them spots.

Agree on still looks funky. My fuel did as well tell about the 4-5 time I adjusted it. Starting to flow a little more smoothly.