Strum Wealh, on 31 December 2015 - 04:27 PM, said:
1 TT Movement Point = 1 Hex per Turn = 30 meters per 10 seconds = 3 meters per second = 10.8 kilometers per hour.
Speed Tweak will (as of 12/01/2015) add a 7.5% speed bonus when enabled (see here).
- Walking/Cruise speed:
- Without Speed Tweak: 10.8 * ((Engine Rating)/(/Mech maximum tonnage))
- With Speed Tweak: 1.075 *10.8 * ((Engine Rating)/(/Mech maximum tonnage))
- Without Speed Tweak: 10.8 * ((Engine Rating)/(/Mech maximum tonnage))
- Running/Flank Speed:
- Without Speed Tweak: 10.8 * 1.5 * ((Engine Rating)/(/Mech maximum tonnage))
- With Speed Tweak: 1.075 * 10.8 * 1.5 * ((Engine Rating)/(/Mech maximum tonnage))
- Without Speed Tweak: 10.8 * 1.5 * ((Engine Rating)/(/Mech maximum tonnage))
The reason the Daishi has a base running speed of 48.6 kph rather than 54.0 kph is that 1.5 * (300/100) = 4.5 MP, and MWO does not round that result up to 5 MP like the BattleTech TT game does.
This is going to be the same for any 'Mech where dividing the stock Engine rating by the 'Mech's tonnage results in an odd number for its walking MP.
The Dasher is a 20-ton 'Mech with a XL 200 Engine, and would come with a fixed "Clan MASC MK I" (which would provide a 10% speed bonus).
Its top speed (running speed with MASC active & speed tweak enabled) would be:
1.10 * 1.075 * 10.8 * 1.5 * (200/20) = 191.565 kph
Skyrider's results are still correct, even if his original method was more roundabout than was needed.

Did some maths based on this, and figured that with a negative top speed quirk added, we can get the Firemoth at/under the old speed limit of 171 kph for a max-engine TDK with 10 pct speed tweek.
If we can buff the Summoner's top speed, why can't we "cheat" and actually use a top speed nerf for the Firemoth to bring about something good?
If we play out the math to 162/174.15 kph (7.5 pct tweek) or 162/178.2 kph (10 pct tweek), they're close-ish.
If we apply a 2 or 3.5 pct nega-quirk to top speed, this reduces it to 158.76/171.072 kph (7.5 pct tweek, 2 pct nerf) or 156.33/171.072 (10 pct tweek, 3.5 pct nerf).
Hopefully, I've done the math adequately. I didn't want to fight punching it all in from my mobile phone.

Sound playable?
Edit: assumes no MASC
Edited by Virlutris, 08 January 2016 - 11:19 AM.