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Microwarpdrive
From EVEWiki
A Microwarpdrive, or MWD, is a speed enhancing module. Like the Afterburner, it fits into a medium sized Slot.
While a Microwarpdrive is Active, your speed is enhanced greatly, much more than an Afterburner. The catch is that your Signature Radius is increased by almost as much while the module is active, effectively canceling out all or most of the evasiveness gained. It also makes you much quicker to target.
Since the enhancement to your evasion is not as potent, it may seem that the MWD will not help you avoid damage much at all. However, since you can close distance or keep distance so well, it is conceivable that you could get to ranges where the enemy weaponry does not work by virtue of range.
While installed and online (whether active or not) a MWD will reduce your maximum Capacitor value, reducing the charge rate and total starting Capacitor. Additionally, the module consumes much more Capacitor than an Afterburner when active, making it one of the most Capacitor intensive modules in existence. You can Offline your MWD to restore your maximum Capacitor value (which helps the recharge rate), but the module will be unavailable and will cost Capacitor to Online it again.
You can only have 1 MWD active at once You can fit an Afterburner and a MWD on the same ship, but they cannot be active at the same time.
Contents 
Thrust Factor & Size Classes
The interactions between ship size and MWD size are the same as with Afterburners. MWDs have a thrust factor associated with them, a different multiple of 15 for each size class:
 1,500,000 newtons for 1MN (Frigate)
 15,000,000 newtons for 10MN (Cruiser)
 150,000,000 newtons for 100MN (Battleship)
The different classes of ship generally have a mass associated with them:
 1,000,0001,500,000+ kg for Frigates and Destroyers
 10,000,00015,000,000+ kg for Cruisers and Battlecruisers
 100,000,000150,000,000+ kg for Battleships
The Thrust Factor of the MWD will adjust the speed bonus of the MWD, depending on the mass of the ship. If the ship weighs less than the Thrust Factor, you will gain additional speed. If it weighs more, you lose speed.
Mass Gain
You must take into account that MWDs increase the mass of the ship when active. Each class of MWD will give a different mass gain appropriate to the class:
 500,000 for 1MN
 5,000,000 for 10MN
 50,000,000 for 100MN
These mass gains will offset the fact that you are provided with a roughly equal amount of additional thrust (i.e. 1,500,000 instead of 1,000,000) that the lightest ship would have enjoyed. It also makes the ship turn and accelerate slower.
Overfitting
If you can somehow fit a Cruiser class MWD onto a Frigate, the speed increase is enhanced by the Thrust Factor/Mass ratio, giving you much more than the intended 500% increase in speed (even after the mass gain). The reverse is also true  if you fit a module that is too small for your mass, you will not gain much of anything.
In any case, unlike Afterburners, you'll be hard pressed to fit a larger MWD on a smaller ship. Even if you did succeed, your ship would likely not be able to fit anything else.
Microwarpdrive Limits & Disruption
Given that the module supposedly puts your ship into a state of "Microwarp", MWDs follow similar rules to Warping in regards to things that can prevent it. However, the rules are not identical.
MWDs will not work in Deadspace locations, excepting those of Faction Warfare locations.
Interdictor, Heavy Interdictor, and deployable type Bubbles do not inhibit MWDs.
The Warp Scrambler type Warp Jammers will deactivate and prevent MWDs from functioning, and even reset the speed of the ship instantly to normal velocity. However, Warp Disruptor type Warp Jammers will have no such effect.
Variations
Common Statistics amongst all MWDs
Velocity Bonus  Thrust Factor  Activation Mass Penalty  Duration  

1MN  500%  1,500,000  500,000  10 sec 
10MN  500%  15,000,000  5,000,000  10 sec 
100MN  500%  150,000,000  50,000,000  10 sec 
Frigate
Name  Meta Level  Capacitor Size Penalty  Signature Radius Penalty  Activation Cost  Powergrid Usage  CPU Usage  

Tech I  1MN MicroWarpdrive I  n/a  25%  500 %  45 Energy  15 MW  25 tf 
Phased Monopropellant I Hydrazine Boosters  1  22%  500 %  45 Energy  15 MW  25 tf  
Catalyzed ColdGas I Arcjet Thrusters  2  19%  500 %  45 Energy  15 MW  23 tf  
Tech II  1MN MicroWarpdrive II  5  17%  500 %  50 Energy  17 MW  25 tf 
Storyline  1MN Digital Booster Rockets  6  14%  500 %  36 Energy  14 MW  21 tf 
Faction  Federation Navy 1MN MicroWarpdrive  7  14%  489 %  45 Energy  15 MW  28 tf 
Shadow Serpentis 1MN MicroWarpdrive  7  14%  489 %  45 Energy  15 MW  28 tf  
Republic Fleet 1MN MicroWarpdrive  8  11%  467 %  40 Energy  17 MW  25 tf  
Domination 1MN MicroWarpdrive  8  11%  467 %  40 Energy  17 MW  25 tf  
Deadspace  Coreli AType 1MN MicroWarpdrive  13  3%  411 %  45 Energy  15 MW  32 tf 
Coreli BType 1MN MicroWarpdrive  12  6%  422 %  45 Energy  15 MW  30 tf  
Coreli CType 1MN MicroWarpdrive  11  8%  433 %  45 Energy  15 MW  29 tf  
Gistii AType 1MN MicroWarpdrive  13  3%  422 %  38 Energy  18 MW  25 tf  
Gistii BType 1MN MicroWarpdrive  12  6%  433 %  38 Energy  18 MW  25 tf  
Gistii CType 1MN MicroWarpdrive  11  8%  444 %  38 Energy  18 MW  25 tf 
Cruiser
Name  Meta Level  Capacitor Size Penalty  Signature Radius Penalty  Activation Cost  Powergrid Usage  CPU Usage  

Tech I  10MN MicroWarpdrive I  n/a  25%  500 %  180 Energy  150 MW  50 tf 
YT8 Overcharged Hydrocarbon I Microwarpdrive  3  19 %  500 %  180 Energy  150 MW  50 tf  
Tech II  10MN MicroWarpdrive II  5  17 %  500 %  198 Energy  165 MW  50 tf 
Storyline  10MN Digital Booster Rockets  6  14%  500 %  144 Energy  135 MW  43 tf 
Faction  Federation Navy 10MN MicroWarpdrive  7  14 %  489 %  180 Energy  150 MW  55 tf 
Shadow Serpentis 10MN MicroWarpdrive  7  14 %  489 %  180 Energy  150 MW  55 tf  
Republic Fleet 10MN MicroWarpdrive  8  11 %  467 %  160 Energy  175 MW  50 tf  
Domination 10MN MicroWarpdrive  8  11 %  467 %  160 Energy  175 MW  50 tf  
Deadspace  Corelum AType 10MN MicroWarpdrive  13  3 %  411 %  180 Energy  150 MW  63 tf 
Corelum BType 10MN MicroWarpdrive  12  6 %  422 %  180 Energy  150 MW  61 tf  
Corelum CType 10MN MicroWarpdrive  11  8 %  433 %  180 Energy  150 MW  58 tf  
Gistum AType 10MN MicroWarpdrive  13  3 %  422 %  150 Energy  180 MW  50 tf  
Gistum BType 10MN MicroWarpdrive  12  6 %  433 %  150 Energy  180 MW  50 tf  
Gistum CType 10MN MicroWarpdrive  11  8 %  444 %  150 Energy  180 MW  50 tf 
Battleship
Name  Meta Level  Capacitor Size Penalty  Signature Radius Penalty  Activation Cost  Powergrid Usage  CPU Usage  

Tech I  100MN MicroWarpdrive I  n/a  25%  500 %  720 Energy  1250 MW  75 tf 
Quad LiF Fueled I Booster Rockets  4  19%  500 %  720 Energy  1250 MW  75 tf  
Tech II  100MN MicroWarpdrive II  5  17%  500 %  729 Energy  1375 MW  75 tf 
Storyline  100MN Digital Booster Rockets  6  14%  500 %  576 Energy  1125 MW  64 tf 
Faction  Gallente Navy 100MN MicroWarpdrive  7  14%  489 %  720 Energy  1250 MW  83 tf 
Shadow Serpentis 100MN MicroWarpdrive  7  14%  489 %  720 Energy  1250 MW  83 tf  
Republic Fleet 100MN MicroWarpdrive  8  11%  467 %  600 Energy  1375 MW  75 tf  
Domination 100MN MicroWarpdrive  8  11%  467 %  600 Energy  1375 MW  75 tf  
Officer  Brynn's Modified 100MN MicroWarpdrive  11  8%  433 %  720 Energy  1250 MW  87 tf 
Mizuro's Modified 100MN MicroWarpdrive  11  8%  444 %  567 Energy  1500 MW  75 tf  
Tuvan's Modified 100MN MicroWarpdrive  12  6%  422 %  720 Energy  1250 MW  91 tf  
Hakim's Modified 100MN MicroWarpdrive  12  6%  433 %  600 Energy  1500 MW  75 tf  
Setele's Modified 100MN MicroWarpdrive  13  3%  411 %  720 Energy  1250 MW  95 tf  
Gotan's Modified 100MN MicroWarpdrive  13  3%  422 %  600 Energy  1500 MW  75 tf  
Cormack's Modified 100MN MicroWarpdrive  14  0%  400 %  720 Energy  1250 MW  100 tf  
Tobias' Modified 100MN MicroWarpdrive  14  19%  411 %  600 Energy  1500 MW  75 tf  
Deadspace  Core AType 100MN MicroWarpdrive  13  3%  411 %  720 Energy  1250 MW  95 tf 
Core BType 100MN MicroWarpdrive  12  6%  422 %  720 Energy  1250 MW  91 tf  
Core CType 100MN MicroWarpdrive  11  8%  433 %  720 Energy  1250 MW  87 tf  
Core XType 100MN MicroWarpdrive  14  0%  400 %  720 Energy  1250 MW  100 tf  
Gist AType 100MN MicroWarpdrive  13  3%  422 %  600 Energy  1500 MW  75 tf  
Gist BType 100MN MicroWarpdrive  12  6%  433 %  600 Energy  1500 MW  75 tf  
Gist CType 100MN MicroWarpdrive  11  6%  444 %  600 Energy  1500 MW  75 tf  
Gist XType 100MN MicroWarpdrive  14  0%  411 %  600 Energy  1500 MW  75 tf 
Ship Bonuses
 All Interceptors have had their Signature Radius reduction bonus changed. It is now a reduction to the activation penalty of MWDs, reducing the Signature Radius penalty by 15% per ship level.
 The Thorax, Deimos, and Vindicator all receive a 5% reduction per ship level to the Capacitor penalty of fitting a MWD. This effectively removes it once the appropriate ship skill is level 5 (or actually adds capacitor capacity for higher meta level MWDs)
Skills, Implants, Rigs, and Boosters
 The Acceleration Control skill will boost the effectiveness of a MWD or Afterburner by 5% per level.
 The Navigation skill provides 5% more base velocity per level.
 The Snake Implants (slot 16) enhance base speed (they now stack with speed modules).
 The Halo Implants (slot 16) reduce Signature Radius.
 The Slot 6 Rogue MY series of Hardwirings enhance the speed increase of Afterburners or MWDs.
 The Slot 6 Rogue CY series and Shaqil's Speed Enhancer both increase the base speed of a ship.
 The Slot 9 Rogue GY series reduces the Capacitor needs of MWDs.
 The slot 10 Skirmish Warfare Mindlink will add 50% more effectiveness to Skirmish Warfare Links, one of which provides a Gang boost to speed.
 The XInstinct series provides a Signature Radius reduction, but may reduce your base velocity as a sideeffect.
 The Auxiliary Thrusters Rig will improve base speed.
 The Polycarbon Engine Housing Rig will improve base speed and agility.
Overheat
Overheating a MWD will increase its velocity bonus by 50%, making it one of the most substantial boosts to receive from Overheating. Even using it in small bursts can give you a huge speed advantage over an enemy that doesn't have the Thermodynamics skill.
Related Modules
 Overdrive Injectors, which boost base speed.
 Nanofiber Internal Structure modules, which also boost base speed, as well as agility.
 Skirmish Warfare Link  Rapid Deployment will add a speed boost to all Fleet members based on the command skills of the Gang Booster.
History
 In the very beginning, MWDs and Afterburners didn't have classes; one module fit any ship. MWDs also didn't have any penalties to stats at all. Additionally, it was possible to activate more than one speed module. All of this combined made fitting more than MWD not only easy, but capable of boosting ships with many midslots to insane speeds (such as the Scorpion). Utilizing at least a dual MWD fit was very common, making it easy to hit nearly fivefigured speeds for most ships.
 Late 2003 saw the first of many nerfs; a 25% penalty to capacitor, armor, and shields was implemented. Although it hurt multimwd fits, it failed to solve the problem entirely. It should be noted that there was no signature penalty, which wasn't added until build 1549. This meant that all of the speed of the MWD would be untaxed until that release, making the wielders nearly invulnerable to all attacks.
 Build 1352 had introduced the 1MN, 10MN, and 100MN size class split, which intentionally permitted players to fit a module one size larger if they could muster up the fitting statistics. Unfortunately, this worked far too well. When Cruisers equipped two 100MN Afterburners, it granted them incredible speeds faster than even Interceptors.
 Build 2942 made it impossible to activate more than one MWD at once, defeating the dual MWD setups for good. Unfortunately, it was still possible to either utilize a MWD and an Afterburner or a pair of oversized Afterburners for still insane speeds.
 Build 3106 increased the effect of the mass increase, making ships wielding oversized speed modules much slower to accelerate and turn. Afterburners joined the MWD in not being able to be activated in conjunction with another speed module. Since proper sized Afterburners were quite weak on their own, the speed boost was changed from 30% to 100%.
 Finally, CCP removed the armor, and eventually the shield penalties from the MWD in late 2004.
 The Revelations 1.4 patch saw more speed nerfs. The Propellant Injection Vent Rig was suddenly changed (without warning) into much weaker Auxiliary Thrusters Rigs. The Propellant Injection Vent gave a 15% (T1) increase to Afterburner and MWD speed, and did it without a Stacking Penalty. In addition, many changes occurred to other speed enhancing modules, making them less powerful. Before the changes, it was still very possible to make a workable speed fit for Battleships.
 Before the Quantum Rise expansion, high meta level MWDs had a base velocity boost higher than 500%, while the signature radius penalty sat at 500% in most cases. As a part of the overall speed nerf of Quantum Rise, the velocity boost was universalized as 500%, while the signature penalty was changed to be progressively reduced with better quality MWDs. The capacitor penalty was also changed to improve with meta level. The other adjustments to speed modules and implants would ensure that five digit speed was truly no longer a reasonable occurrence.
 Quantum Rise would also add in the effect of Warp Scrambler type Warp Jammers shutting down MWDs.