using 14.047 for desired AFR and not 14.63?

42lb injectors. I've changed the spark tables a few times. I was running a stock ls6 table but decided I needed more so I used the 98 table and went to 28°. The ve table is smoother now. I went off and retuned the car and it didn't help anything. The stupid thing was telling me it was super close throughout the range in olsd. Whatever I guess :shrug: still doesn't tell me why my fuel trims are out of whack at idle. Probably some setting I missed. I don't remember what the maf looked like I'm check it again, I didn't get that far yet. I don't drive the car often. It's got 1600 miles on it in the last 2 years 1200-1300 of it was breaking in motor, transmission, clutch, and rear end lol.
I'll get back to it later and get it more dialed in. Ls6 intake..

2 Questions:

1. Are you using {AFR}/{GM.AFR} as BEN factor? (analog or serial)

2. What are the injector offset settings?

I guess I am confused. Your tune you attached has a rough ve table but you said it is smoother now.

As far as your idle issue, I explained what was happening. With a big cam, you run some overlap, the 02's see the unburnt oxygen and assume car is lean and the 02s then add fuel.

Just curious but are injectors 42# @ 3 bar or 4 bar?

Quote:

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Originally Posted by mr.prick

2 Questions:

1. Are you using {AFR}/{GM.AFR} as BEN factor? (analog or serial)

2. What are the injector offset settings?

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1. I'm pretty sure thats what it is. 2. IDK I did that 2 years ago

Quote:

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Originally Posted by Chalky

I guess I am confused. Your tune you attached has a rough ve table but you said it is smoother now.

As far as your idle issue, I explained what was happening. With a big cam, you run some overlap, the 02's see the unburnt oxygen and assume car is lean and the 02s then add fuel.

Just curious but are injectors 42# @ 3 bar or 4 bar?

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I've spent the last 2 days dicking with my tune. Smoothing a tune is one of the easier things I've done. They are standard bosch 42lb injectors. Those are rated 43.5 psi.

That cam is tiny, I just always read about negative fuel trims with more cam and maybe no one is referring to ide. I guess I should stop worrying about it :shrug:

I think the reason my VE table was so close is for some reason my car has to be correcting fueling. I noticed there are STFT while in OLSD. Why would that happen, LTFT is disabled and o2 are not supposed to go to closed loop before 252 degrees, but i remember reading here sometime ago that they may still be doing something.

It looks like {B4001} was increased but all the other tables in the injectors folder are stock.
This maybe the issue

If you change {B3601} and use AFR for BEN there can be another problem too.

From the looks of it, you are using IFR values for 3 bar 42# injectors. With GM being 58#, 4 bar, you need to bump up your IFR tables.

As far as STFT/LTFT, if you are in OL, trims are not being influenced by 02's. Could your MAF still be functioning and not in SD? MAF or 02's functioning pretty much make ve tuning a waste of time.

Personally, I liked my cam 224/228-114 with xer lobes. I would have gone to 228/232 with afr 205 heads I had but I worried about PTV clearance. I just thought that size cam was about perfect for a street motor of this size. JMO

Must be in semi open loop if stft are changing O2 voltage?

Quote:

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Originally Posted by mr.prick

It looks like {B4001} was increased but all the other tables in the injectors folder are stock.
This maybe the issue

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WHat else would I be changing? I just used the injector spread sheet and the car started right up.

Quote:

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Originally Posted by mr.prick

If you change {B3601} and use AFR for BEN there can be another problem too.

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I just recently changed that seeing what would happen. I don't think I'll be leaving it there.

Quote:

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Originally Posted by Chalky

From the looks of it, you are using IFR values for 3 bar 42# injectors. With GM being 58#, 4 bar, you need to bump up your IFR tables.

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I'll recheck that but I'm positive I did it right.

Quote:

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Originally Posted by Chalky

As far as STFT/LTFT, if you are in OL, trims are not being influenced by 02's. Could your MAF still be functioning and not in SD? MAF or 02's functioning pretty much make ve tuning a waste of time.

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The MAF is unplugged when I do it. I'm presuming the o2s are messing up the program.

Quote:

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Originally Posted by Chalky

Personally, I liked my cam 224/228-114 with xer lobes. I would have gone to 228/232 with afr 205 heads I had but I worried about PTV clearance. I just thought that size cam was about perfect for a street motor of this size. JMO

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It seems to work well. I would have went bigger but my car weighs 3800lbs and has a whopping 347 cubic inches so I stayed there.

Quote:

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Originally Posted by slows10

Must be in semi open loop if stft are changing O2 voltage?

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That's my assumption. I don't know any better. There has to be a reason, I made some tweaks to the ve table and every cell I hit was within 1% and I know my original tune was not even close to that good. And even if it was, it would be off by more than that. Loggin o2 voltage won't tell me anything though, unplugging them is too much of a PITA.

To run total open loop I think B4206 has to be disabled. If it is enabled then o2 feedback will be used with the open loop table B3605. Also B3801 has to be disabled. B4205 set to max temp. Are you trying to just run open loop with no trims?

I'll check that, I hope that's the problem. Yes I want no fuel correction at all. It's been a while and my brain is toasted lol Thanks

Quote:

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Originally Posted by slows10

To run total open loop I think B4206 has to be disabled. If it is enabled then o2 feedback will be used with the open loop table B3605. Also B3801 has to be disabled. B4205 set to max temp. Are you trying to just run open loop with no trims?

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Correct.

Picnic_George, not trying to be difficult but it helps if you post up any tune you are referring to.

Quote:

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Originally Posted by Chalky

Correct.

Picnic_George, not trying to be difficult but it helps if you post up any tune you are referring to.

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I realize that, I'm not trying to be difficult either. But I'm on a different computer :P I'll check that out and get back.

B4206 was enabled, I'll check that out later tonight and hopefully get this going. Thanks guys..

That helped considerably, there was a lot I had to do on the low load/rpm tables. Up top not much changed from where I had it but I kind of expected that anyways. I'll log a couple more sessions, clean my MAF and make sure that is in check.

Quote:

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Originally Posted by Chalky

MAF table is rough. MAF table is normally a smooth transition from low to high.

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Maybe I don't see it. I don't see any peaks or dips in it. I didn't smooth it but it looked OK. The car always ran well.

Does this look better?
Attachment 12062

Yes.

Why is the ve table so low in the low load and rpm ranges? It seems like it is much lower than even a stock engine. Is it to do with the cam?

What mods are done to it? Post another log if you can. Do anyone know what the specs of a stock LS1 cam are?

I also think you are way lean in PE mode. Would it be safer to set B3618 richer than your B3605? B3605 is ect vs map. Maybe run a cos with B3647 with map x rpm if you want to stay open loop.

PE is disabled on this tune. Running strictly off the VE table. Now I gotta dial in the maf. I just gotta remember how. I think I leave everything exactly the same just turn the maf on and set b0120(i think) to 400 rpms?