STOP right there!
RATINGS:
Tekin rated at 210 cont. amps, Castle Mamba 120 cont. amps. Both run same mag lev fans @ 5v
Tekin's Cooling fins have more exposure to air flow but their case is smaller and sealed from the elements. Mamba has more plastic restricting air flow compared to tekin and yet its case (especially if you get the ones where the battery wire is not a plug) that is open allowing dust to go right down onto the mother board and settle on and underneath it, add moisture to that dust and your asking for a short circuit which hasn't happened to me but 2 other racer buds of mine. They are in need of a case update, the plug type battery was move in the right direction.
MILAGE:
I've been posting requests for peoples truggy and buggy milage for the last few weeks on multiple forums and so far on average 4s MM 2200 vs. T8 2000 shows the Castle motor getting 9% WORSE milage than the Tekin. Thats more about the KV math really, but they describe the 2200 as super to over powerful, the 2000 as just about right and great for racing and the 1700 as good for small tracks but a tad underpowered sometimes. Your track size and required run times will help you decide here.
BALANCE & WEIGHT:
I love the way the chassis from RC monster looks and am for purpose built chassises but your still getting an inferior motor mount and especially if your trying to get 15-20 minute runs, your going to need like marvin said a 6500-8000mah battery which when put on the other side will make that left side HUGELY unbalanced. You are likely to see the car sway to one side on jumps or turn differently one way vs. the other, you will see more wear and scraping under your chassis on the heavy side. Depending on your pack (6.5k or 8k) and if you put the ESC on the battery side too, your looking at 25-35% weight imbalance on that left side.
VOLTAGE:
I do like 5s or even 6s vs 4s for efficiency. Marvin is right you will be cooler, run longer per MAH spent and dont have to use as high of a MAH pack to reach the same runtime as a 4s. But you have to understand while while a 4100mah 5s might get the same milage as a 5000mah 4s (due to cooler running efficiency) you will have 1 extra cell on the 5s, making the weight and cost be about the same. (compare this with equal C ratings and you'll see what I mean). So, 5s or 6s with the appropriate motor is great for cooler runnings especially in summer but dont do it thinking your going to save money or weight on batteries.
The only down side to 5s or 6s is flexibly. You see I honestly want to run 5 or 6s like I used to and believe they are superior but currently run 4s because on rare occasion when I have been in need of a battery or motor (perhaps i forgot to charge a pack, a rotor spun or bearing blew out), since 4s is about 70% of the electric racers out there, its much easier to borrow a spare from people. Again see what others are running in your area and decide whats best for YOUR situation.
BATTERIES:
Marvin is right MAX amps suck balls. Hyperion is amongst the best and you can charge them at up to 5c (granted you get a charger that can charge that high) for super fast charging times.
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