Seeing as no one had any input I thought I would share what info I managed to glean from my own research.
First thing is the Castle 3800kv is according to them (and I quote) "approx 800watts output", this was direct from castle themselves, which just proves you can’t always believe what you read.
Huge power from a 540 motor, and in my slash I am geared 14/50 and it’s still barely getting hot. Castle advise to keep it all in the 180f range for long term use and on this gearing its only getting to a max of 115f during a 5 minute heat on a technical high bite astro track; so I think there is room to go up another tooth or possibly 2 on the pinion for more top speed to keep with those running sub 7.5t motors, all with more torque than you can shake a stick at?
The cheaper Trackstar motors appear to be fantastic 'spec wise' but it’s the long game where they are less good. Internals are decent at best and they are apparently good motors if you get one that works but wont last last a very long like some other higher brand motors Tekin/Castle etc. How much of an issue this is for some depends on what they want.
So all in all, comparing these 2 motors are like comparing a 4pot to a V8? The castle being better in every area it seems, more torque and more total power along with great reliability and with the right speedo can be monster fast (max 100k rpm). So if budget allows go for something of a higher quality - (see the phrase “buy cheap, buy twice”)
Based on what I have found over the last few weeks I have opted now to use a TEKIN motor and a rather swish TEKIN speedo (not naming the exact items as I am hoping they could be my secret weapon in the nationals). The motor I got is around £100 so it had better be good as I could have got 3 of the trackstar motors to suit different tracks/applications for the same price!! Even with all that said I am still going to take a punt on a couple of the Trackstar motors just purely to see how they compare in the field as they could well be suitable for another car (ie the little mans TT01 Drift Car).
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