What is Dwell Time? [GOLD WEBINAR LESSON]

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When setting up an aftermarket ECU, one of the common questions we get is regarding correctly setting the dwell time. Getting this wrong can result in insufficient spark energy, or worse still, a damaged coil, however many tuners don’t know what dwell time is or how to decide on the correct values.
In this webinar we’ll find out what dwell time is and show you how you can utilise an oscilloscope to find the correct dwell time.
For the lesson we’ll be using a few examples including the Haltech ESP software coupled with our Subaru WRX STi. As always though, the vehicle and ECU is just used for demonstration (we have to use something 😉 ) and the knowledge shared will apply to more than just this specific combination.
Due to the current global situation we though over the next few weeks we'd help keep you guys out there entertained and release some of these Gold Membership webinars to you for FREE to help pass the time.
Want to watch the members-only webinar on Engine Build Considerations or Engine Failure Analysis along with over 230 other lessons on engine building, tuning, and wiring topics? Sign up here for only $19 USD a month, start and stop at any time (unlike your gym membership!):bit.ly/GoldMembershipHPA
Website: www.hpacademy.com
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#highperformanceacademy #dwelltime #learntotune #oscilloscpe

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2 июл 2024

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Комментарии : 45

@johnsheikh3831 4 года назад

These gold webinars are perfect being stuck in the house. Perfect food for the brain thank you!

@hpa101 4 года назад

Great to hear! That was our goal. There is only so much Tiger King you can watch eh haha -Taz.

@willnzsurf 4 года назад

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.💯

@charles1379 3 года назад

a great explanation of dwell time. thank you

@bernardob.b.toledo7164 4 года назад

Great vídeo!! Congrats! Thanks

@dalenassar9152 3 года назад

OK, I think I found what I needed at about 12:30 ...should've not 'jumped the gun' during the video, GREAT!!

@doom9344 4 года назад

Thank you! master!

@macgyverdroid 3 месяца назад

What is the best application? For sequential coil on plug internal igniter Or ignition coil external igniter

@alexjenner1108 Год назад

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.

@daveshiroma 4 года назад

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)

@TheSol115 2 года назад

Make more power at 1.5 ms

@2slofouru 4 года назад

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!

@Domas64 4 года назад

Nice info! thanks. Are these free gold webinars temporary, because of quarantine, or will you continue to release them?

@josephschaefer9163 4 года назад

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

@alltheboost5363 4 года назад

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.

@richardtheweaver4891 Год назад

“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.😮

@sexyfacenation 4 года назад

Wait, where do I use my feeler gauge?

@speechlessracing Год назад

How do you set dwell if your not running a map/maf and only throttle position sensor as a load

@christopherhead2490 3 года назад

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 .

@dalenassar9152 3 года назад

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!

@Skirk84 4 года назад

How do i get you to tune my car in Aus? You run rings around my tuner

@traceworld6571 Год назад

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.

@rileylilwell5201 4 года назад

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👌🏼

@Kenuwine24 4 года назад

There's a formula based on the trigger teeth and the percentage you want the coil to work at. Id have to find it.

@khaledali3566 4 года назад

👏👏👏👏👏👏👏👏👍

@xxnasosxx 4 года назад

perfect video but the drawing of the ignition coil is wrong on 07:30 . the secondary coil need to be grounded not +12v

@dtecdynosystems6382 3 года назад

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.

@alejandrocasas1455 Год назад

But you should increase the gap on spark plugs to see improvement on hp's, isn't it??

@blakep241 Год назад

what effect would a dwell time which is too high, have on a power run, and AFR, etc?

@NgocPhamVN96 Год назад

It's kill coil and even ECU òi Dwell time is too hight

@blakeperkins8717 Год назад

@@NgocPhamVN96 and what about in relation to the question I asked?

@alexjenner1108 Год назад

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.

@IGAalmaty 4 года назад

don't you wanna make new aftermarket ecu using all your experience with all top ecu's ? ) just an idea)

@hpa101 4 года назад

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.

@c2rautomotive 4 года назад

High Performance Academy a make your words my words, really good ecus today for sure 💪

@1977jelliott 4 года назад

Dwell time..... Duty cycle..... Same same.... Different different.

@dailydrivenmuscle. Год назад

Bigger gap will increase power...it's proven. Adding Dwell will help with a larger gapped spark plug...NA.

@hpa101 Год назад

Until it doesn't, and bigger than what? Just saying a bigger gap is better implies you should just make it as big as physically possible, which wouldn't make more power at all to be fair - Taz.

@dailydrivenmuscle. Год назад

Yet you didn't turn it up 4ms just to test or prove the theory...

@hpa101 Год назад

Time stamp please, we possibly have more content on what you are referencing there - Taz.

@richardcaldwell6159 3 года назад

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.

@JimmyLoose 2 года назад

Ok, so RU-vid 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.

@hpa101 2 года назад

We do our best to add tags now, but it's worth the watch regardless if you really do want to learn - Taz.