Quick tip: I’ve also been able to find dwell time in factory service manuals. If memory serves, Nissan VQ35 was 1.3 or 1.8 ms (obviously my memory isn’t that good)
I have the 2500 and am going to use new oem subaru coils. I'm not sure if their internal ignitors will completely control dwell on their own. I also notice in the haltech map for the sti I'm using, the lowest dwell is 3.6ms. I also can't see the voltage range (top of the graph) on my laptop, the only numbers I actually see are the dwell settings. This is something extremely important I need to figure out before the tune. Thanks for the great helpful videos..as always!
With regards to the msd vs stock dyno test, it might be more appropriate to do a fuel mileage test instead. On my car my msd box makes it start and idle just a bit better and I went from 27 to 28 mpg
16:05 You are understandably simplifying things a bit here. Maximum current for the coil also depends on current limiting in the ignition module. For example, for a 1.0 ohm coil and 12 volts this implies you can have 12 Amps, and for a 0.5 ohm coil, you can have 24 Amps, but most systems you'd see in production or modified production cars aren't drawing 12 Amps through the coil. What happens is the first part of the curve comes from the coil resistance, inductance and the DC voltage, but at a certain point the current is limited to maybe 5.5 Amps or 8 Amps by the ignition module. You have a two part curve and once you reach the current limiting by the module, increasing dwell won't get help you store any more energy in the coil. Thanks for this video. 44 minutes is long, but a lot of practical information was worth watching the whole thing.
Please tell me: "HOW MUCH CURRENT IS REQUIRED TO PULL THE TRIGGER PULSE TO GROUND" I have been searching for the answer to this for a long time. I assume the pulse is just brought from 12v to GND. Thanks MUCH!
are the coils the only component that can fail ? Is the ecu in danger of overheating if dwell is incorrect. Wiring too? I have an 04 miata in batch ign. All this is important for me. Been worried about upgrading the ign for this reason .
How does dwell time affect a CDI box? I have a feeling long as the signal is there that's all that matters but if you have a general CDI box like an msd6al is it worth it to run fixed dwell or can you very it and get better results for things like start up.
Sorry, you are incorrect. Majority of 2 terminal coils have secondary internally connected to igniton (+ve) terminal as shown in diagram. There are some exceptions, but this is how Bosch do it for example.
copper has a positive temperature coefficient, so if anything, heating your coil has a detrimental effect. You might not measure the difference on the dyno, but increasing coil resistance generally isn't considered a good thing. also your ECU or ignition module is probably doing some current limiting to help protect your coil, so that gets hot too. Being stranded by the side the road or track will not win races or impress your friends.
I have ignition controller box that only alters Ignition timing and dwell timing. the company who has sold this to me told me to keep dwell timing to 1ms can anybody tell me is good to keep dwell that low or should I change to make effective in making power or fuel economy.
Is there a way to know you have added too much dwell before you smoke the coils? Or is it just go for broke?😂 Always love your vids guys, learnt a heap from this one👌🏼
Most aftermarket standalones these days are so good, there is really no point. The choice on the market is broader and of a higher standard than it has ever been - Taz.
Ah, a different definition for "dwell time". Dwell is the period near TDC where the piston is nearly stationary. It is adjusted by changing the rod to stroke ratio and the amount of piston offset. I realized quite early in my quest to solve internal combustion that spark ignition engines simply can't achieve acceptable levels of efficiency. And yes, I was successful. Even figured out how to build an engine with two combustion cylinders that provides smoother power than a straight six.
Ok, so RUclips video making tip.... I saw the title of this video, it is the same as the question I had, then I looked down in the corner of the thumbnail and saw it was 44 minutes long. I'm not going to take 44 minutes to get this question answered. I did not watch this video because of that. Yes, I only came on here to make this comment. Geeezuz, I could explain calculus in less time.
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These gold webinars are perfect being stuck in the house. Perfect food for the brain thank you!
Great to hear! That was our goal. There is only so much Tiger King you can watch eh haha -Taz.
Making a Tesla Coil in High School Physics course made this seem logical to me. It's all about the voltage & spark gap ratios! & the magnetism.💯
a great explanation of dwell time. thank you
What is the best application?
For sequential
coil on plug internal igniter
Or ignition coil external igniter
Quick tip: I’ve also been able to find dwell time in factory service manuals. If memory serves, Nissan VQ35 was 1.3 or 1.8 ms (obviously my memory isn’t that good)
Make more power at 1.5 ms
I have the 2500 and am going to use new oem subaru coils. I'm not sure if their internal ignitors will completely control dwell on their own. I also notice in the haltech map for the sti I'm using, the lowest dwell is 3.6ms. I also can't see the voltage range (top of the graph) on my laptop, the only numbers I actually see are the dwell settings. This is something extremely important I need to figure out before the tune. Thanks for the great helpful videos..as always!
Great vídeo!! Congrats! Thanks
Nice info! thanks. Are these free gold webinars temporary, because of quarantine, or will you continue to release them?
With regards to the msd vs stock dyno test, it might be more appropriate to do a fuel mileage test instead. On my car my msd box makes it start and idle just a bit better and I went from 27 to 28 mpg
16:05 You are understandably simplifying things a bit here. Maximum current for the coil also depends on current limiting in the ignition module. For example, for a 1.0 ohm coil and 12 volts this implies you can have 12 Amps, and for a 0.5 ohm coil, you can have 24 Amps, but most systems you'd see in production or modified production cars aren't drawing 12 Amps through the coil. What happens is the first part of the curve comes from the coil resistance, inductance and the DC voltage, but at a certain point the current is limited to maybe 5.5 Amps or 8 Amps by the ignition module. You have a two part curve and once you reach the current limiting by the module, increasing dwell won't get help you store any more energy in the coil. Thanks for this video. 44 minutes is long, but a lot of practical information was worth watching the whole thing.
Not all igniters have current limiting .
If you could do a lesson on developing numbers from no data ,it would be handy
OK, I think I found what I needed at about 12:30 ...should've not 'jumped the gun' during the video, GREAT!!
Please tell me: "HOW MUCH CURRENT IS REQUIRED TO PULL THE TRIGGER PULSE TO GROUND" I have been searching for the answer to this for a long time. I assume the pulse is just brought from 12v to GND.
Thanks MUCH!
are the coils the only component that can fail ? Is the ecu in danger of overheating if dwell is incorrect. Wiring too? I have an 04 miata in batch ign. All this is important for me. Been worried about upgrading the ign for this reason .
How do you set dwell if your not running a map/maf and only throttle position sensor as a load
Thank you! master!
How do i get you to tune my car in Aus? You run rings around my tuner
“if we actually called it charge time”
There you go. Here I thought you were going to talk about offset pistons and rod:stroke ratios.😮
How does dwell time affect a CDI box? I have a feeling long as the signal is there that's all that matters but if you have a general CDI box like an msd6al is it worth it to run fixed dwell or can you very it and get better results for things like start up.
perfect video but the drawing of the ignition coil is wrong on 07:30 . the secondary coil need to be grounded not +12v
Sorry, you are incorrect. Majority of 2 terminal coils have secondary internally connected to igniton (+ve) terminal as shown in diagram. There are some exceptions, but this is how Bosch do it for example.
what effect would a dwell time which is too high, have on a power run, and AFR, etc?
It's kill coil and even ECU òi Dwell time is too hight
@@NgocPhamVN96 and what about in relation to the question I asked?
copper has a positive temperature coefficient, so if anything, heating your coil has a detrimental effect. You might not measure the difference on the dyno, but increasing coil resistance generally isn't considered a good thing. also your ECU or ignition module is probably doing some current limiting to help protect your coil, so that gets hot too. Being stranded by the side the road or track will not win races or impress your friends.
But you should increase the gap on spark plugs to see improvement on hp's, isn't it??
I have ignition controller box that only alters Ignition timing and dwell timing. the company who has sold this to me told me to keep dwell timing to 1ms can anybody tell me is good to keep dwell that low or should I change to make effective in making power or fuel economy.
Is there a way to know you have added too much dwell before you smoke the coils? Or is it just go for broke?😂
Always love your vids guys, learnt a heap from this one👌🏼
There's a formula based on the trigger teeth and the percentage you want the coil to work at. Id have to find it.
don't you wanna make new aftermarket ecu using all your experience with all top ecu's ? ) just an idea)
Most aftermarket standalones these days are so good, there is really no point. The choice on the market is broader and of a higher standard than it has ever been - Taz.
High Performance Academy a make your words my words, really good ecus today for sure 💪
👏👏👏👏👏👏👏👏👍
Dwell time..... Duty cycle..... Same same.... Different different.
Whys your car so slow?
We're driving into a headwind - Taz
Ah, a different definition for "dwell time". Dwell is the period near TDC where the piston is nearly stationary. It is adjusted by changing the rod to stroke ratio and the amount of piston offset.
I realized quite early in my quest to solve internal combustion that spark ignition engines simply can't achieve acceptable levels of efficiency. And yes, I was successful. Even figured out how to build an engine with two combustion cylinders that provides smoother power than a straight six.
Ok, so RUclips video making tip.... I saw the title of this video, it is the same as the question I had, then I looked down in the corner of the thumbnail and saw it was 44 minutes long. I'm not going to take 44 minutes to get this question answered. I did not watch this video because of that. Yes, I only came on here to make this comment. Geeezuz, I could explain calculus in less time.
We do our best to add tags now, but it's worth the watch regardless if you really do want to learn - Taz.