Cobb AccessPORT Discussion
05-01-2008, 09:14 PM
#2227
05-01-2008, 09:17 PM
#2228
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05-01-2008, 09:24 PM
#2229
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05-01-2008, 09:35 PM
#2231
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05-01-2008, 09:46 PM
#2232
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Any thoughts on the ability to wring out more performance from the MSD LS2 coils??
Even after a short drive of @5 min, they are the hottest to touch parts under the hood.
Even after a short drive of @5 min, they are the hottest to touch parts under the hood.
05-01-2008, 09:55 PM
#2233
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05-01-2008, 10:50 PM
#2234
Dwell is more related to points type ignition systems. How long the points stay open which is related to points gap. The larger the points gap the longer the points give spark to the spark plug.
Now if the AP can lengthen the spark duration,, don't know. Will it benefit the tune if it could, don't know.
Seems to me with the proper AF's the spark duration would not be to much of a factor.
Leaner AF ratios would not need a long duration of spark.
Maybe more of a factor with very rich AF's for complete combustion. Also a longer spark duration will effect timing. Such that if it were started to early, detonation. If it lasted to long at higher rpm's, detonation/overlap on the next combustion cycle.
Optimum would be to have the shortest most powerful spark available at the leanest AF and timing point.
Now if the AP can lengthen the spark duration,, don't know. Will it benefit the tune if it could, don't know.
Seems to me with the proper AF's the spark duration would not be to much of a factor.
Leaner AF ratios would not need a long duration of spark.
Maybe more of a factor with very rich AF's for complete combustion. Also a longer spark duration will effect timing. Such that if it were started to early, detonation. If it lasted to long at higher rpm's, detonation/overlap on the next combustion cycle.
Optimum would be to have the shortest most powerful spark available at the leanest AF and timing point.
05-01-2008, 11:12 PM
#2235
The dwell is adjusted by setting the points gap to a specified distance at maximum opening. A narrower gap gives more dwell and a wider gap gives less. Taking it to extremes, excessive dwell means that the points close too soon after opening, cutting off the magnetic field collapse before it delivers all its energy. Too little dwell gives the magnetic flux insufficient time to build up to the maximum.
Both conditions give a weak spark which gets even weaker as the engine RPM rises and produces misfiring at normal operating speeds. The dwell, as well as spark plug gap, do have an effect on ignition timing. The later the points open, the later the spark comes and retards the timing. The earlier the points open the sooner the spark comes and advances the timing.
I'm just missing points altogether.
I think in saying duration of spark, I was more meaning spark power.
Both conditions give a weak spark which gets even weaker as the engine RPM rises and produces misfiring at normal operating speeds. The dwell, as well as spark plug gap, do have an effect on ignition timing. The later the points open, the later the spark comes and retards the timing. The earlier the points open the sooner the spark comes and advances the timing.
I'm just missing points altogether.
I think in saying duration of spark, I was more meaning spark power.
Last edited by Easy_E1; 05-01-2008 at 11:21 PM.
05-02-2008, 01:38 AM
#2239
Much like fuel injectors, you would just need to know the "latency" values and then you square up the table to get you back where you started before the swap.
05-02-2008, 06:56 AM
#2240
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It wouldn't be "optimizing" - it would just be correcting for the different dwell of the MazSport ignition to get it to react the way the OE coils already do (as well as the other integral-ignitor coils that function as replacements for the OE coils).
Much like fuel injectors, you would just need to know the "latency" values and then you square up the table to get you back where you started before the swap.
Much like fuel injectors, you would just need to know the "latency" values and then you square up the table to get you back where you started before the swap.
05-02-2008, 07:08 AM
#2241
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so to "dumb this down" a little bit, if you have the ignition solution ,and cobb, you can tune for the new ignition and get a horse or two more out of the car, compared to a car that is running a different engine management?
05-02-2008, 07:42 AM
#2242
If you have the MazSport ignition and the AccessPORT, (or the Int-X or another aftermarket EMS) you can adjust the calibration so that it simply runs correctly.
Without access to the dwell adjustment (like having the ignition and an OE flash), you might run the coils out of their charging range and have misfires.
05-02-2008, 08:01 AM
#2244
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No.
If you have the MazSport ignition and the AccessPORT, (or the Int-X or another aftermarket EMS) you can adjust the calibration so that it simply runs correctly.
Without access to the dwell adjustment (like having the ignition and an OE flash), you might run the coils out of their charging range and have misfires.
If you have the MazSport ignition and the AccessPORT, (or the Int-X or another aftermarket EMS) you can adjust the calibration so that it simply runs correctly.
Without access to the dwell adjustment (like having the ignition and an OE flash), you might run the coils out of their charging range and have misfires.
05-02-2008, 08:22 AM
#2245
I dynoed 260 whp last week, to give you an idea. Someone with the int-x had issues too, but soon as the dwell was setup, it ran without issue.
05-02-2008, 08:31 AM
#2248
Yes. But its correctable. What sucked was going in, dropping $68 for the dyno session and finding the car makes less hp than when I had the stock greddy kit. I felt like selling my car off.
05-02-2008, 08:35 AM
#2249
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So the next question will be, what will it take to get this corrected for my car? Is is one of those per car fixes or is it a blanket adjustment for anyone with the ignition? Will it be necessary for everyone or just people with FI?
Last edited by Celronx; 05-02-2008 at 08:46 AM.
05-02-2008, 08:44 AM
#2250
Finally Boosted!!!!!!!
