Please post your dwell settings here!
#1
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Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,278
Total Cats: 37
Please post your dwell settings here!
For those of you running Adaptronic, could you please post your dwell settings using my entry as a template:
Car: 1999 (NBA)
Coils: original
Dwell: 2100us
Time on this setup: 3 months / 3,000 miles
Coil problems: none
I know some of you are running up to 5000us dwell. It will be good to have a bit of a database happening to see if the higher dwell time contributes to early failures.
Thanks!
Car: 1999 (NBA)
Coils: original
Dwell: 2100us
Time on this setup: 3 months / 3,000 miles
Coil problems: none
I know some of you are running up to 5000us dwell. It will be good to have a bit of a database happening to see if the higher dwell time contributes to early failures.
Thanks!
#3
dwell = charge time for the coil pack before it sparks... Too little = weak spark. Too much = hot coil.
Less voltage requires greater dwell time and vice versa.
2500 for me right now. Seems to be running well. I think somewhere around 3000 is optimal for stock coil packs at around 14.5 volts, I was running that last week before my last coil pack croaked. I turned it down a bit so I could drive it a little bit if I had too, not sure how much difference it made 'cause the pack would still crap out when it got warm.
It's more complicated when you have to play with a spinning distributor, electronic ignition is quite a bit easier, just plug in the number you want.
I'm no pro, but have to tune my wife's '69 beetle from time to time. Good learning experience for sure...
Less voltage requires greater dwell time and vice versa.
2500 for me right now. Seems to be running well. I think somewhere around 3000 is optimal for stock coil packs at around 14.5 volts, I was running that last week before my last coil pack croaked. I turned it down a bit so I could drive it a little bit if I had too, not sure how much difference it made 'cause the pack would still crap out when it got warm.
It's more complicated when you have to play with a spinning distributor, electronic ignition is quite a bit easier, just plug in the number you want.
I'm no pro, but have to tune my wife's '69 beetle from time to time. Good learning experience for sure...
#14
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Join Date: Jul 2006
Location: atlanta-ish
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:scratches head:
Why would you intentionally run dwell substantially less than factory?
Mazda, who spent (tens? hundreds?) millions of dollars designing the factory management system runs 5-5.5 ms dwell from the first NA6 all the way through the NB1. If you were constantly beating the snot out of the car (read high rpm all the time, 6k+), then maybe I'd lower it down to 4-4.5ms, just to give some recovery period. But running 2-3 ms is plain silly. Hot spark = good.
I don't know what dwell the NB2 runs.
Why would you intentionally run dwell substantially less than factory?
Mazda, who spent (tens? hundreds?) millions of dollars designing the factory management system runs 5-5.5 ms dwell from the first NA6 all the way through the NB1. If you were constantly beating the snot out of the car (read high rpm all the time, 6k+), then maybe I'd lower it down to 4-4.5ms, just to give some recovery period. But running 2-3 ms is plain silly. Hot spark = good.
I don't know what dwell the NB2 runs.
#16
So last night I lowered my dwell from 5000 to 2500 and the amps from 1.9 to .9 and the car RAN LIKE ABSOLUTE ****.
I mean the idle was ridiculously rough, lean as ****, and completely horrible.
Richening up the map at idle or doing ANYTHING was completely useless.
So I turned it back to 5000 and 1.9amps and it runs great again. A bit rich at idle now, but I'll dial that out.
So yeah..I guess my car doesn't like me to touch the dwell settings
#20
I'm running the PnP map from DIYAutotune on my 98 UK NB (Megasquirt but doesn't matter). It's on stock coils and they specify 3.5ms running, 8.0ms cranking, and 1.0ms discharge period.
Im interested in bumping up my running dwell if Mazdas ECU runs at 5ms! Have you any proof or datasheets on this?
Cheers,
Craig