Dear reuben
In the uk where it is pretty low grip outdoors, even when it is hot, when the cars ran 6 and 5 cells it was HPI Pink front with HPI silver rears.
With the new lower weight limit you can go to a softer rated spring - therefore HPI Silver front with Blue rear.
If you are indoors you can return to HPI pink front and Silver rears due to the higher traction on carpet.
I carried out a golden ratio calculation of the respective springs and I came to using 40wt schumacher oil with HPI Silver front with 35wt schumacher oil and blue rears.
Whilst I am no amazing driver (I make club level a finals normally) I have asked people using xrays and other cars to try this out, and it just seems to work.
The beauty of the HPI springs are that they don't collapse like xray springs tend to do outdoors on long sweeping corners. That's my humble opinion.
Lohan
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