Coil Dwell Settings with ProTuner & AccessPort
08-28-2009, 10:34 PM
#80
Hmmmmmm.........
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I took the OEM dwell table, I then took the Bosch base dwell of 3.5 and divided it by the oem base dwell (3ms) (3.5/3 = 1.67) and multiplied the dwell table values by this amount.
What did I miss?
Cheers
Andrew
What did I miss?
Cheers
Andrew
Last edited by auzoom; 08-28-2009 at 10:40 PM.
08-28-2009, 11:18 PM
#84
Hmmmmmm.........
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Sorry, you are right. I miss typed. I had 1.16666666667 and I think I went cross eyed 
.
Other than the difference between 1.1666666666666666666666666666667 and 1.16, that is what I have.
.Other than the difference between 1.1666666666666666666666666666667 and 1.16, that is what I have.
05-02-2010, 09:54 AM
#90
weeeeeeeeee
iTrader: (12)
The best advice I've gotten out of it was to follow Jedi's example and grab Jeff by the neck!
----------
So somewhere between mid page 2 and the end of page 3 I thought I had it all figured out.... Really simple **** for my LS2 coils too...
LS2 base dwell = 5ms
Stock base dwell = 3 ms
5/3 = 1.66666....
Open up ATR, go to the dwell table and multiply the whole thing by 1.666666
Then Kane's comment, apparently recommended by Ray to multipy by 1.45 instead?
WTF people?
To make matters even more confusing LS2 coils apparently have their own termination, assumedly for self-preservation, so then I can't help but wonder why we don't just max out the friggin table!
Have the BHR guys posted a dedicated dwell thread for the BHR coils that I simply haven't been able to locate? Can someone link to it if so?
05-03-2010, 06:00 AM
#91
The idea is you want the shortest dwell possible that doesn't missfire. The same way you want the lest fuel possible that doesn't run lean.
The Mazda service manual has the dwell at approx 3.8ms dwell at idle and the LS2 is at 5....so if 1.45 gets then great, if not do 1.66.
This is the table from another source.
Volts Dwell
8 9.5
9 7.7
10 5.9
11 4.9
12 4.2
13 3.7
14 3.3
15 2.9
The Mazda service manual has the dwell at approx 3.8ms dwell at idle and the LS2 is at 5....so if 1.45 gets then great, if not do 1.66.
This is the table from another source.
Volts Dwell
8 9.5
9 7.7
10 5.9
11 4.9
12 4.2
13 3.7
14 3.3
15 2.9
05-03-2010, 06:48 AM
#92
I divide by zero
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I originally ran the +66% to hit 5ms. After some chatting with Ray I went down to +45% and it worked just fine. Since switching to much richer tables I just did +55% across the board and called it a day.
05-03-2010, 07:06 AM
#93
weeeeeeeeee
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I'm at +45% now and digging it. May revisit in a couple weeks when I put on this bolt on.
Knowing stock 3.8 helps a bitunderstanding wise. I missed that.
Thanks Kane, Jedi, and Flashwong
Knowing stock 3.8 helps a bitunderstanding wise. I missed that.
Thanks Kane, Jedi, and Flashwong
05-03-2010, 09:57 AM
#94
In the case of the BHR Coils
Soooo scaling the entire ingitor dwell time table isn't hard...
I've have 2 tunes saved now ... one scaled at an m value of 1.66 (66%) and another at 1.45 (45%)
Neither of these look anything like the BHR Dwell table shown in the first post by the OP of the thread. I'm guessing this should be updated or deleted for clarity?
Kanes statement in post #91 confused me slightly just when I thought I had it all fingered out (yes I said fingered)
Understanding that you want the shortest dwell time possible without a miss fire, as mentioned already, Mazda aims for 3.8ms dwell (not base dwell, correct?) and the LS2 coils aims for 5ms.
Confirmation of math and values:
To arrive at these values you add the value on the dwell time table to 3.0 ms?
Example OEM = @ 12.75 volts at 1000 rpm dwell time is 1208 .... therefore 1.208ms + 3.0ms = 4.208ms
Example BHR +45% dwell = @ 12.75 volts at 1000 rpm dwell time is 1752 .... therefore 1.752ms + 3ms = 4.752ms
Example BHR +66% dwell = @ 12.75 volts at 1000 rpm dwell time is 2013 .... therefore 2.013ms + 3ms = 5.013ms
Holy crap I think I get it.
Yes?
Soooo scaling the entire ingitor dwell time table isn't hard...
I've have 2 tunes saved now ... one scaled at an m value of 1.66 (66%) and another at 1.45 (45%)
Neither of these look anything like the BHR Dwell table shown in the first post by the OP of the thread. I'm guessing this should be updated or deleted for clarity?
Kanes statement in post #91 confused me slightly just when I thought I had it all fingered out (yes I said fingered)
Understanding that you want the shortest dwell time possible without a miss fire, as mentioned already, Mazda aims for 3.8ms dwell (not base dwell, correct?) and the LS2 coils aims for 5ms.
Confirmation of math and values:
To arrive at these values you add the value on the dwell time table to 3.0 ms?
Example OEM = @ 12.75 volts at 1000 rpm dwell time is 1208 .... therefore 1.208ms + 3.0ms = 4.208ms
Example BHR +45% dwell = @ 12.75 volts at 1000 rpm dwell time is 1752 .... therefore 1.752ms + 3ms = 4.752ms
Example BHR +66% dwell = @ 12.75 volts at 1000 rpm dwell time is 2013 .... therefore 2.013ms + 3ms = 5.013ms
Holy crap I think I get it.
Yes?
Last edited by wcs; 05-03-2010 at 09:59 AM.
05-03-2010, 10:11 AM
#95
I can't believe this thread persists.
The OE table yields a dwell setting of 3.5ms. Everywhere.
That is all the numbers mean from a practical standpoint.
If you don't believe that, take a scope to the coil trigger and see for yourself.
Now divide your target dwell by the OE dwell (ie 5ms/3.5ms=1.428) and multiply the WHOLE TABLE by this number.
Done.
The OE table yields a dwell setting of 3.5ms. Everywhere.
That is all the numbers mean from a practical standpoint.
If you don't believe that, take a scope to the coil trigger and see for yourself.
Now divide your target dwell by the OE dwell (ie 5ms/3.5ms=1.428) and multiply the WHOLE TABLE by this number.
Done.
05-03-2010, 10:21 AM
#96
^^^^ AAAAAAA HA!!!!
I'm glad I asked!
So it's not 3.0ms its 3.5ms, I was never completely confident that I was using the right value.
Thanks MM that's what I did, except I used the wrong base value.
Honestly I tried to find it in the Mazda Shop Manual.
Done and DONE.
I'm glad I asked!
So it's not 3.0ms its 3.5ms, I was never completely confident that I was using the right value.
Thanks MM that's what I did, except I used the wrong base value.
Honestly I tried to find it in the Mazda Shop Manual.
Done and DONE.
05-03-2010, 02:19 PM
#98
n0 pants
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Man...Reading threads like this make me realize how much im going to poo on myself when I try and tune my car. I will definitely be creating a thread for that. It will be called, Noob with accessport = ???!
09-16-2011, 01:03 PM
#99
bumping this (as well as starting controversy) just for you, pal
I've since concluded that using a multiplier on the existing Mazda dwell map, while it is easy to do and works, is not really ideal.
instead, I took the attached factory D585 coil dwell table and using the same multiplier concept came up with a new dwell table that closer approximates it in a general manner along with consideration for the Renesis output characteristic and rpm limit considerations. My reasoning is that IMO the Mazda dwell table is a bit off in this regard.
Team puts flame suit on
Last edited by TeamRX8; 09-16-2011 at 01:07 PM.