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Coil Dwell Settings with ProTuner & AccessPort

Old 09-16-2011, 07:56 PM
  #101  
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Well there's no doubt that it does this in several areas, but so far my data is not suggesting this for the dwell
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Old 09-16-2011, 08:20 PM
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How did you measure the actual dwell?
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Old 09-16-2011, 09:38 PM
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It should be possible to figure out the correct scaling for this table. Most table references in Mazda roms actually define the "real world" scaling and offset.

For whatever reason, Cobb chose not to use them in all cases.

For example, here is a fuel table with Mazda's scaling:


Closed loop targets make more sense with the Mazda scaling, IMO:


Unfortunately, the dwell table is one of a few which use a different data structure with no scaling, but here it is with the same scaling as the fuel table. 0.00390625, which is used for about 40 tables, and also for Subaru dwell tables in 32bit ecus. (in ms.) Make any sense?

Attached Thumbnails Coil Dwell Settings with ProTuner & AccessPort-ol.png   Coil Dwell Settings with ProTuner & AccessPort-dwell.png   Coil Dwell Settings with ProTuner & AccessPort-cla.png  
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Old 09-17-2011, 03:18 AM
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Oh, duh. 0.00390625 = 1/256 = .5^8
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Old 09-18-2011, 02:29 AM
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Looking at the code, all this table seems to be used for is to set a 16-bit down-counter for one-shot pulse generation, pretty straightforward compared to other subroutines.
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Old 09-24-2011, 08:07 PM
  #106  
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I thought there was 6.6ms of time between ignition events @ 9000 rpm?
if that last table is a delay then wouldn't the stock dwell be 5.12 ms?
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Old 09-24-2011, 09:10 PM
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No, I think those are the actual dwell times. IOW, multiply your desired dwell in ms by 256 to get the value.
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Old 05-10-2012, 05:00 PM
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Been meaning to bump this. I made a spreadsheet to convert the dwell values to/from milliseconds.

This is the stock table.

Code:
	1000	2000	3000	4000	5000	6000	7000	8000	9000
6.50	7.58	6.00	4.75	3.56	2.85	2.38	2.04	1.78	1.58
7.75	6.75	5.33	4.67	3.56	2.85	2.38	2.04	1.78	1.58
9	6.08	4.83	4.22	3.56	2.85	2.38	2.04	1.78	1.58
10.25	5.58	4.42	3.86	3.52	2.85	2.38	2.04	1.78	1.58
11.5	5.17	4.08	3.58	3.27	2.85	2.38	2.04	1.78	1.58
12.75	4.83	3.83	3.36	3.04	2.83	2.38	2.04	1.78	1.58
14	4.42	3.58	3.14	2.85	2.65	2.38	2.04	1.78	1.58
15.25	3.75	3.38	2.97	2.71	2.50	2.36	2.04	1.78	1.58
16.5	3.25	3.13	2.81	2.56	2.38	2.24	2.04	1.78	1.58
This is what I've been running for the past few months.

Code:
	1000	2000	3000	4000	5000	6000	7000	8000	9000
6.50	21.09	16.08	12.34	11.02	9.00	7.00	5.55	4.50	3.50
7.75	15.39	12.61	10.07	9.03	8.00	7.00	5.55	4.50	3.50
9	9.72	9.15	7.81	7.04	6.30	6.30	5.55	4.50	3.50
10.25	7.51	7.23	6.55	6.12	5.55	5.55	4.86	4.50	3.50
11.5	5.71	5.71	5.64	5.40	5.00	5.00	4.17	3.84	3.50
12.75	4.73	4.73	4.73	4.68	4.46	4.46	3.80	3.65	3.50
14	4.16	4.16	4.16	4.16	4.11	4.11	3.50	3.35	3.20
15.25	3.83	3.83	3.83	3.83	3.81	3.81	3.30	3.11	2.91
16.5	3.50	3.50	3.50	3.50	3.48	3.48	2.92	2.77	2.61
Attached Files
File Type: zip
dwell.xls.zip (1.08 MB, 399 views)
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Old 05-10-2012, 05:09 PM
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nice bump there oltman .

Where were you a few yrs ago ? Could have saved a lot of heartache !!!!
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Old 05-10-2012, 05:24 PM
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But now i'm confused???

So we don't just multiply the dwell table by 1.45?
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Old 05-10-2012, 05:36 PM
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/\ Nope . Check out his spreadsheet - I'm going to try those d585 settings


Oltman - would you mind posting all the info you have on startup dwell . I still think startup is inferior with the 585s and wouldn't mind haveing another look at that .

Cheers

Last edited by Brettus; 05-10-2012 at 06:36 PM.
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Old 05-11-2012, 01:03 AM
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Originally Posted by Brettus View Post
/\ Nope . Check out his spreadsheet - I'm going to try those d585 settings


Oltman - would you mind posting all the info you have on startup dwell . I still think startup is inferior with the 585s and wouldn't mind haveing another look at that .

Cheers
Are you runing yukons now? i thought you were on stock coils?
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Old 05-11-2012, 02:10 AM
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Switched over a few months back - just because the oems had a lot of kms on them .

Have done a couple of logs since changing the settings this afternoon . Seems good so far.
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Old 05-11-2012, 07:11 AM
  #114  
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Inferior startup? any thoughts on helping blow thru warm start issues? i have to clear the chambers from time to time with the gas peddle fuel cut trick.
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Old 05-11-2012, 02:45 PM
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Originally Posted by ShellDude View Post
Inferior startup? .
yes - have discussed this in another thread at some length . In discussions with oltman , it appears that startup dwell not taken from the dwell table above but is a separate parameter . And it would seem that the 585s should ideally have a lot more dwell at startup than the oems .
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Old 05-11-2012, 02:50 PM
  #116  
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Looking at his table the difference is HUGE. I'll have to find this other thread.
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Old 05-11-2012, 03:02 PM
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Old 05-11-2012, 05:27 PM
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heh... maybe I should post this in the dumb questions thread...

There's a separate table for startup and we can't get to it in ATR?

In Protuner, you're using an "extended" editor to edit it?

Sorry ahead of time if I'm totally off base. I'm intrigued as I run the original BHR coils and have characteristics similar to others -- but it seems this is a very common "trifecta" and couldn't have anything at all to do with the coils given the severity of any one of the qualifiers.
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Old 05-11-2012, 06:13 PM
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Originally Posted by ShellDude View Post
heh... maybe I should post this in the dumb questions thread...

There's a separate table for startup and we can't get to it in ATR?

In Protuner, you're using an "extended" editor to edit it?

Sorry ahead of time if I'm totally off base. I'm intrigued as I run the original BHR coils and have characteristics similar to others -- but it seems this is a very common "trifecta" and couldn't have anything at all to do with the coils given the severity of any one of the qualifiers.
Protuner has access to all the tables - which is the correct table to edit is not easy to figure out however .
As far as other factors causing warm start issues - sure . All i can say to your suggestion that the coils don't affect it is ...... try the oem coils back in there . You just might get a shock .
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Old 05-11-2012, 06:55 PM
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no I'm totally with you... not doubting the message at all... just frustrated that there's nothing I can do about it.
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Old 05-11-2012, 06:55 PM
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Originally Posted by Brettus View Post
Protuner has access to all the tables - which is the correct table to edit is not easy to figure out however .
As far as other factors causing warm start issues - sure . All i can say to your suggestion that the coils don't affect it is ...... try the oem coils back in there . You just might get a shock .
I've never had hard start issue with the BHR coils
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Old 05-11-2012, 07:30 PM
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Originally Posted by wcs View Post
I've never had hard start issue with the BHR coils
good
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Old 05-11-2012, 08:08 PM
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Originally Posted by Brettus View Post
nice bump there oltman .

Where were you a few yrs ago ? Could have saved a lot of heartache !!!!

I told you in this very thread last year ...
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Old 05-11-2012, 08:32 PM
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Originally Posted by TeamRX8 View Post
I told you in this very thread last year ...
Well - you said something that was vaguely headed in the right direction which was a slight improvement on what MM has been saying ..........
Oltman actually nailed it once and for all .
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Old 05-11-2012, 08:43 PM
  #125  
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No, MM just did his usual arguing about never being wrong and I didn't just hand it over publicly on a silver platter. You never bothered to contact me privately either.
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