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So for everyday driving (no track days) would i be better of with just Racelogic TC?
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Personally, I would say not...
TC is great at adding traction by limiting power...which is fine on the start line...but if you only have one wheel driving (the other spinning, like with a standard open diff) you have to cut the power delivery to gain traction.
With a LSD you get two wheels driving...although the type of LSD varies, as does how effective the added drive is...to be honest, ATB type LSDs are fine for road use (Peloquin or Quaiffe) but for high torque engines I, personally, prefer friction type diffs...clutch and plate type (ZF or Gemini)
So, an LSD doesn't cut power...
TC doesn't add grip...it just cuts power to maximise the grip you have...
But only on the start line...
Through the corners, I much prefer organic traction control of an LSD which allows you to vary the grip by varying the power...whereas electronic TC systems are less favoured in these circumstances.
As has been said before...ideally you will have TC for the start line, and an LSD for the corners...
Which brings us to your original question...and the answer, as always, is not clear cut!
Do you value off the line grip as more imortant than grip through the bends?
If you race off every traffic light...then perhaps TC is for you...on an otherwise standard car.
If you like to hammer through bends, in all conditions, I'd argue the LSD will give more benefit in everyday driving....on a standard car.
You pays your money, and takes your choice...
I don't like electronic systems that affect the dynamics of the car whilst in motion...hence I'll stick with organic additions like an LSD....that would be my first step...
It's my belief that an LSD will make you faster A-B...maybe not much faster off the line, (both wheels will still spin if you are rough with the throttle, as Rich says) but everywhere else.