IraqiWalker, on 29 April 2014 - 04:52 PM, said:
Nice, that's an interesting set up. I tend to always go max engine, mainly because of the fact that I want as much speed as possible.
When I initially got my three Locusts (Phoenix pack) I used a 180XL in it almost exclusively because I already had the engine from a slower, weapon-heavy Blackjack build I was using. I've since added a 190XL to my parts bin and do notice the difference between equipping the two engines, but the 180XL is competent enough in most situations except tanging with another really fast (160kph+) light. If you've got the fast light on the ropes you need the engine to keep up with him, and if he decides to turn and tangle with you and it doesn't go well for you, you need all the speed you can get to break off and find your closest teammate.
I think with my LCT-3S (triple SRM2 build) I'll keep using the 190XL because with the bigger engine it's easier to unload the SRMs and get out again, but with the 1V and 3M I feel I can drop down to the 180XL and get a useful advantage from the extra half tonne. 160.4kph (180XL plus speed tweak) isn't exactly chopped liver, but it's also not 169.3kph (190XL plus tweak). There are times when you don't need that extra 9kph but can use the extra weight to make a build stronger.
I'd advise against going much slower than 150kph though; I have a feeling it will decrease the mech's survivability exponentially. The stock 160 (129.6kph, 142.6kh with tweak) isn't enough power in my opinion, though when I was using it it was just to test out the stock builds back when the Locust had the bigger leg hitboxes - 140kph might be survivable for a locust now but I haven't tried it; 145.8kph (180XL without tweak) was borderline with the old hitboxes - I had mostly adequate matches, though my disappointing matches seemed to be more common than my good matches to the point that I ended up using GXP (that I'd converted from mech XP during a 50% sale) to buy my way to speed tweak rather than grind the locusts to it.
If I'd have to suggest a general guideline, I'd say ideally you'd want a 190XL until you get Speed Tweak, then if you feel your build can put the extra half tonne to good use you can consider a 180XL. If you have to run a 180XL without tweak from the start (already have a 180XL and you're not Mr. Moneybags, able to drop 6 million credits on two XL engines for a light), then always beware of the fast enemy light and head straight for your closest teammate if he gets a bead on you.