I’m trying to wrap my head around Daiwa’s braking system. Most of their reels use SV boost for braking, but some such as the steez a2 use mag z boost.

I understand that SV boost uses an inductor on the spool that moves outwards into the magnets in the side plate in 2 stages during a cast. Mag z boost also does this if I’m not mistaken. 
 

Is mag z boost just a variant of SV boost? What makes it different? Do they each have their own strengths and weaknesses? If so what are they?

 

Thanks in advance. 

SV is a "heavier"/stronger brake.

All daiwa brakes operate on an inductor getting pulled into a magnet.  The different models (PE, Hyper long cast, boost, SV boost, Magforce Z, Magforce 3D, etc) are variations on that general design.  Some have smaller inductors or lighter magnets.  Some use a softer/lighter spring attaching the spool and inductor.  Personally OG Magforce Z is the best.

49 minutes ago, woolleyfooley said:

... Is mag z boost just a variant of SV boost? What makes it different? Do they each have their own strengths and weaknesses? If so what are they?

 

Thanks in advance. 

Yes, this is exactly correct, MagForce/Z/SV are progressions of the very same brake system.  

SV is characterized by the lightest-mass inductor, essentially providing a lighter brake, offset by the return spring rate, and less total spool weight to give it better light-end performance.    

Boost provides two different spring rates for retracting the inductor, intended to get more cast distance in the back-half of the cast using a wider range of lure weights.  

The Boost spools use two springs to create a dual stage over the previous single stage springs. 

 

The difference between Magforce Z and SV is that Magforce Z uses centrifugal weights to extend the inductor towards the magnets and SV uses two plastic ramps to extend the spool when the inductor is twisted. 

 

On SV spools the twisting occurs from the difference in inertia between the SV spool inductor sitting in the magnet ring and the spool rotating.  The braking effect on the inductor wants to rotate the inductor slower than the spools rotation so turns slower than the spool for a 1/4 turn and extends from the two ramps interacting and locks out until the spring force can overcome the two ramps and slide down into the seated position.  

 

Magforce Z doesn't care about the magnets and can have short inductors quite far away from the spool when retacted because they use centrifugal force to extend the inductor into the magnet rings.

 

SV is just a cheaper and lighter way of emulating the behavior of Magforce Z.  Sometime this means that the SV spool is super light and more controlled and sometimes it does not.  It depends on the braking profile of the spool.  There are many Daiwa spools with many different braking profiles with just modern Magforce Z Boost ranging from super fast long casters like the HLC to more control orientated spools like the JDM Zillion HD. 

 

As a general rule for stock spools in stock reels (you can swap and mod Daiwa spools) the SV are more control orientated for skipping and pitching into cover and the Magforce Z spools are better for distance at the loss of some low speed control.  

SV for control. Z for distance. Never tried Z Boost, tho.

23 hours ago, bulldog1935 said:

Yes, this is exactly correct, MagForce/Z/SV are progressions of the very same brake system.  

SV is characterized by the lightest-mass inductor, essentially providing a lighter brake, offset by the return spring rate, and less total spool weight to give it better light-end performance.    

Boost provides two different spring rates for retracting the inductor, intended to get more cast distance in the back-half of the cast using a wider range of lure weights.  

Interesting. Thank you. So would an sv boost and a mag z boost spool both have two different spring rates? If so is the main difference between sv boost and mag z boost the braking profile as you said? 

Here's your homework, and the photo that dropped out 

If you look at inertia, acceleration (force) and jerk at spool start, it takes force to start a spool spinning, and less force to keep it spinning - the extra energy after spool start needs to be removed by brake force to prevent start-up backlash.  Jerk is closer to impact, and you can look at it as magnifying acceleration-force by 4 to 10 times.  If you try to absorb both jerk and acceleration energy with a single "medium" spring, that spring is a trade-off between being able to remove all the jerk energy (especially casting heavy weights), and removing too much acceleration energy (doesn't let the spool spin up all the way) for maximum cast distance.  

 

You can look at  the stiffer spring and softer spring of Boost as separate springs for jerk and acceleration.  The stiffer spring only moves the inductor deeper with jerk and retracts quickly.  The softer spring engages the inductor half-way and gets you through acceleration over-shoot with minimal energy subtracted from the spinning spool.  

 

Lenz brake force is proportional to inductor mass.  I would look at MagZ with greater inductor mass as a stronger brake for more total spool + line mass and casting heavier weights, and SV as a slightly weaker brake for less total spool + line mass and casting somewhat lighter weights. 

note in this photo how the purple-anodize inductor is both thicker and deeper than orange-anodize inductor on SV spools.  

 

17 hours ago, bulldog1935 said:

Here's your homework, and the photo that dropped out 

If you look at inertia, acceleration (force) and jerk at spool start, it takes force to start a spool spinning, and less force to keep it spinning - the extra energy after spool start needs to be removed by brake force to prevent start-up backlash.  Jerk is closer to impact, and you can look at it as magnifying acceleration-force by 4 to 10 times.  If you try to absorb both jerk and acceleration energy with a single "medium" spring, that spring is a trade-off between being able to remove all the jerk energy (especially casting heavy weights), and removing too much acceleration energy (doesn't let the spool spin up all the way) for maximum cast distance.  

You can look at  the stiffer spring and softer spring of Boost as separate springs for jerk and acceleration.  The stiffer spring only moves the inductor deeper with jerk and retracts quickly.  The softer spring engages the inductor half-way and gets you through acceleration over-shoot with minimal energy subtracted from the spinning spool.  

Lenz brake force is proportional to inductor mass.  I would look at MagZ with greater inductor mass as a stronger brake for more total spool + line mass and casting heavier weights, and SV as a slightly weaker brake for less total spool + line mass and casting somewhat lighter weights. 

 

That makes a lot of sense! Thank you! 

On 11/13/2024 at 10:37 PM, webertime said:

SV is a "heavier"/stronger brake.

All daiwa brakes operate on an inductor getting pulled into a magnet.  The different models (PE, Hyper long cast, boost, SV boost, Magforce Z, Magforce 3D, etc) are variations on that general design.  Some have smaller inductors or lighter magnets.  Some use a softer/lighter spring attaching the spool and inductor.  Personally OG Magforce Z is the best.

For what type of fishing/baits/weight do you prefer the OG Magforce Z? Better than Magforce Z-boost?

When? How? I have a Zillion 1000 with OG SV-boost spool and want to try a Z-boost spool (shallow, use thin braid) for better distance with 3/4-1oz compact baits in headwinds. Use a 9'6" ML sea bass rod, so high spool revs. OG Magforce Z or Z- boost?

5 hours ago, anteman said:

For what type of fishing/baits/weight do you prefer the OG Magforce Z? Better than Magforce Z-boost?

When? How? I have a Zillion 1000 with OG SV-boost spool and want to try a Z-boost spool (shallow, use thin braid) for better distance with 3/4-1oz compact baits in headwinds. Use a 9'6" ML sea bass rod, so high spool revs. OG Magforce Z or Z- boost?

I like Magforce Z for heavier weight, really for everything.  Deeper spools too.  Sv-Boost is actually really good  but you can feel the braking which is tunable so it can be diminished but... heavier lines with the shallower spool lead to "oh shoot! backing!!!" Moments far more often than OG Z but very similar distance (not as far).  Maybe SV Boost is better in the wind but that's probably more bait dependant.

I found a minor sweet spot on my CV-Z casting 3 g with SV Boost 1000S - farther than every other Daiwa I own, but it was a very narrow window - it got start-up backlash increasing the weight to loaded 1/8 oz jighead, and 1/4 oz was right out.  

 

I don't have MagZ Boost, but trying every other spool I own, it liked SV non-boost with mono, and casts PE#1.5 beginning at 1/4-oz very well on MagZ 1012 spool.  

 

This was on 8'9' shore rod rated 3 to 30 g.  @anteman

I think MagZ Boost would probably do better with the heavier weights you're describing.  

On 12/11/2025 at 22:04, bulldog1935 said:

Encontré un pequeño punto óptimo en mi CV-Z lanzando 3 g con SV Boost 1000S, más lejos que cualquier otro Daiwa que poseo, pero era un margen muy estrecho: tenía holgura inicial al aumentar el peso a una cabeza plomada cargada de 1/8 oz, y 1/4 oz estaba completamente fuera de lugar.  

 

No tengo MagZ Boost, pero probando todos los demás carretes que tengo, le gustó el SV sin boost con monofilamento, y lanza PE#1.5 a partir de 1/4 oz muy bien en el carrete MagZ 1012.  

 

Esto se hizo con una caña de orilla de 8'9" con una potencia de 3 a 30 g.  @anteman

Creo que MagZ Boost probablemente funcionaría mejor con los pesos más elevados que describes.  

Excuse me, I want to participate and revive the discussion. I cast lures between 10 and 40 grams, however I can't decide between the Daiwa Tatula TW 150 (with Mag Z and LC spool)Or the Salamandura SV TW 150 (with SV Boost and SV Concept)? Which would you choose for casting weights between 10 and 40 grams? Thank you very much. 

I vote for MagZ - should be perfect with that weight range. 

On 11/17/2025 at 10:30 AM, Andrés Milano said:

Excuse me, I want to participate and revive the discussion. I cast lures between 10 and 40 grams, however I can't decide between the Daiwa Tatula TW 150 (with Mag Z and LC spool)Or the Salamandura SV TW 150 (with SV Boost and SV Concept)? Which would you choose for casting weights between 10 and 40 grams? Thank you very much. 

Both should be great but keep in mind that the Salamdura is a 34mm spool platform and the Tatula 150 (the new one) is a 38mm platform so it will palm a little taller than the Salamandura.  

Thanks guys I think I will go with the Mag Z-boost spool rather than the older Mag-Z. To Andres - hard question and I think it will depend on what weights you will use the most. if compact baits 25-40g and going for distance, I would go Mag Z because Mag-z is more of s distance mag brake and spool diameter is better for distance with heavy baits but the SV-boost spool I have is more allround braked spool and the 34 mm spool will do better with lighter weights. My 21 Zillion SV-boost does well with 25-30g bomb casts into headwinds, stabile and a tie with my 12 Exsence DC but I would like to gain a few more yards if possible with a Mag-Z boost spool while hopefully still controlable in headwinds, its for a rather specific use.

Doesn't matter to me, I can backlash both.

On 11/14/2024 at 6:34 PM, bulldog1935 said:

Lenz brake force is proportional to inductor mass.  I would look at MagZ with greater inductor mass as a stronger brake for more total spool + line mass and casting heavier weights, and SV as a slightly weaker brake for less total spool + line mass and casting somewhat lighter weights. 

I have my first SV Boost reel. After my first outing I back lashed like there was no tomorrow, and quickly realized it casted completely different than my Mag Z spools. Like others have stated Mag Z for heavier weights, and SV for lighter weights. I'm assuming casting heavier weights with the SV spool requires a smoother accelerated cast instead of a flick? I need more time on the SV system, but any help would be appreciated.

@2earlye - wrist snap is bonus distance casting spinning tackle.

The jerk it produces gets subtracted by MagForce brake and doesn't add to cast distance.

Whatever jerk energy remains that SV or MagZ can't subtract is start-up backlash.

Smooth acceleration is rewarded with distance, and leaves little for MagForce to do - more energy goes into cast distance.

Let the rod rebound and lure weight carry the cast, not the jolt you add to the rod.

42 minutes ago, 2earlye said:

I need more time on the SV system, but any help would be appreciated.

Describe your rig. Rod, reel, line, lure.

4 oz

4g

it all works the same if you cast correctly

2 hours ago, PhishLI said:

Describe your rig. Rod, reel, line, lure.

Medium Light fast action 1/8thoz - 1/2oz
Daiwa Sliver Wolf PE Special
0.8 PE + 8 fluro
Soft plastics ranging from 6 grams - 15 grams.

1 hour ago, 2earlye said:

Medium Light fast action 1/8thoz - 1/2oz
Daiwa Sliver Wolf PE Special
0.8 PE + 8 fluro
Soft plastics ranging from 6 grams - 15 grams.

I have the same reel and I have also struggled with the same backlashing. It just does it randomly. I can get a few good casts and then I am back to picking out braid. I have tried multiple rods and too many different lines to count. I found, for me, that it likes stuff around 1/4oz to 1/2oz. Anything above or below that, and I'm in for a long day of not fishing.

With that said, I have the new Steez SV TW and it has the SV Boost spool. I had some initial issues with it but once I figured it out, it's been fine. I will say that casting distance has not been what I had hoped for but it's not bad. In terms of retrieve and casting, it is a really smooth reel.

5 minutes ago, FishTank said:

I have the same reel and I have also struggled with the same backlashing. It just does it randomly. I can get a few good casts and then I am back to picking out braid. I have tried multiple rods and too many different lines to count. I found, for me, that it likes stuff around 1/4oz to 1/2oz. Anything above or below that, and I'm in for a long day of not fishing.

With that said, I have the new Steez SV TW and it has the SV Boost spool. I had some initial issues with it but once I figured it out, it's been fine. I will say that casting distance has not been what I had hoped for but it's not bad. In terms of retrieve and casting, it is a really smooth reel.

That's about the same lure weights I intend to throw on this reel. I'm using it mainly for bait finesse so ned rigs, free rigs weightless etc. Habits from using the Mag-Z braking system carried over and it this reel made me realize after my first outing that my cast are sloppy(I'm used to just casting it harder). I know with more time on the water with it I'll adjust to it.

@2earlye I fish 1000S SV Boost spool on my Ryoga, casting 1/2-oz Spook Jr.

I fish 3-6 g on my Silver Wolf on Roro-X27 fixed-inductor spool, which is completely intolerant of jerk. If I cast this with wrist snap, it would backlash every cast.

Get the flick out of your cast, you'll end backlash and increase distance, because SV won't have to subtract spool speed to prevent start-up backlash.

36 minutes ago, bulldog1935 said:

Get the flick out of your cast, you'll end backlash and increase distance, because SV won't have to subtract spool speed to prevent start-up backlash

That's the plan. My sloppy technique needs to be refined. I'll need more outings and practice to get it right.