WOT AFR & Timing Tuning

[blsnelling]

Your PE EQ of 1.13 for E10 (see your B3601) is also quite lean.

For E10 you need to be closer to 1.16-1.17 (AFR 12.1). Your AFR's are tuned to the wrong fuel type..See:http://forum.efilive.com/showthread....l=1#post103113..E10 Worksheet (post#52).

Where are you getting the 1.13 from? I have B3601 set to 14.17, which is 9% alcohol on the chart you referenced. Are you suggesting I change B3618 to .855? If I understand this, I'm taking 14.17 * .855 = 12.115 PE commanded AFR?

[blsnelling]

I forget exactly what they are. I'm thinking they're something like 32# The 8.1L Marine injectors are 44#. That's what I'll be getting. My injector values where set by the tuner that I bought my initial mail order tune from.

[WeathermanShawn]

Where are you getting the 1.13 from? I have B3601 set to 14.17, which is 9% alcohol on the chart you referenced. Are you suggesting I change B3618 to .855? If I understand this, I'm taking 14.17 * .855 = 12.115 PE commanded AFR?

From your Tune.

B3618 should be in EQ for simplicity (not AFR!). An EQ of 1.16-1.165 will work for any fuel.
Yours is currently at 1.13 which is borderline lean, especially with the KR you are getting.

[blsnelling]

I didn't realize that could, or should be changed. For future newbies, I found it under Edit -> Properties, while the table is open. You'll have to close and reopen the tun file for it to take affect..

[blsnelling]

I've got a set of 8.1L marine 44# injectors on the way. Those should do real good for me. I suppose I'll have to go back and redo my VE and MAF tables. I'm guessing they'll be close, but should be gone over again.

It just so happens that my original tune was tuned by accident for 8.1 marine injectors. He later changed it to the 8.1 truck injectors that I have now. So I've got the values he was using for the bigger injectors. It looks like he changed B3701, B4001, B4003, and B4004. For B4001 he used 43.8374. My current injectors are only 29.9483!

[blsnelling]

Are you guys doing anything with B6244 to reduce knock sensitivity? My original tune had all 11s in the 0-1600 rows, and smaller changes in rows 2000-4000.

[WeathermanShawn]

I would strongly advise against changing any of the Knock Sensitivity Parameters like B6244. Mine is stock.

What I have modified is B6207 Knock retard Recovery Rate. Mine is at .2500. That way if and when I ever get KR (very rarely now) it will 'recover' back to the High-Octane Spark within 2-3 seconds..instead of the normal 8-10 seconds.

My preference for the street is to keep a 4-6 degrees range between High and low octane Spark. I like the ASpark feature. That way if you get KR, your spark reduces..you avoid the second-third occurrence. Everybody is different. But to answer your question I modify B6207 and perhaps B6203 by a couple of degrees.

[joecar]

I've been alot busy lately, but I have been reading along in this and the other thread, good info guys

[etmotorsports]

I have noticed with the KR is that once it starts it goes a bit crazy with retarding timing, great if you have blower or nitrous but for NA kinda overkill. However if the fuel and timing is all correct most all but a small amount of the KR will go away i have only seen power numbers drop on the dyno when the KR is over 1.5 and up, most of the kr below that is all due to heat, which could really be an in audible knock and you should try to get rid of it. Some of the larger acamshafts and exhaust systems will set off.

[Sid447]

I would strongly advise against changing any of the Knock Sensitivity Parameters like B6244. Mine is stock.
What I have modified is B6207 Knock retard Recovery Rate. Mine is at .2500. That way if and when I ever get KR (very rarely now) it will 'recover' back to the High-Octane Spark within 2-3 seconds..instead of the normal 8-10 seconds.
My preference for the street is to keep a 4-6 degrees range between High and low octane Spark. I like the ASpark feature. That way if you get KR, your spark reduces..you avoid the second-third occurrence. Everybody is different. But to answer your question I modify B6207 and perhaps B6203 by a couple of degrees.

Agree,
Though for {B6244} I went through all the LS1 tune files I could find and used the "best" of them for most of the knock settings (usually found in the 2004-on files).

Best of them being, in no particular order:
2004 Pontiac GTO
2004 ZO6
2004 HSV GTS (SD file) [caution, the holdencrazy stock file has a few glitches in it or else it's not 100% stock].
2006 CV8 Z or HSV GTO

I also set {B6207} at .2500 from 2000rpm up.
{B6219} @ 1.0
{B6214 & 15} @ 300 & 6400rpm respectively.
{B6223} @ 2.0
{B6240,41 & 42} used 2006 VZ settings.
(Reasoning here is that by end of Gen 3 production the factory most probably had a handle on the right settings).

The only departure from some stock file is {B6210} :

LABELS Burst Knock Delta Air Mass (Grams)
RPM Value
0 0.500000
400 0.427978
800 0.373291
1200 0.336670
1600 0.310547
2000 0.288330
2400 0.268799
2800 0.251465
3200 0.236328
3600 0.222168
4000 0.208252
4400 0.195312
4800 0.182129
5200 0.167725
5600 0.151611
6000 0.135010
6400 0.119873
6800 0.103760
7200 0.085205
7600 0.061768
8000 0.034668

This works for me and I have had no problems of any kind. So please take as advisory only!