Shocks: Drilling pistons for on-road TC?

[Lee Dyson]

Hi just wondering is it really worth doing this for indoor touring car racing, Ive looked on the off road section and a good few people seem to be increasing the diameter of the holes to 1.2mm or greater with drill bits to reduce 'pack'. I'm currently running kit 2 hole pistons on my xray. Will anyone think it will make a noticeable difference in grip on smooth carpet if i go about drilling them? / Anyone tried it?
Cheers

[mole2k]

Touring cars dont land jumps so is there much need to worry about pack?

[chris_dono]

it makes a difference When I ran my xray 008 I had 1.1mm 3 hole pistons all round.

[SlowOne]

It will make a difference. Pack and rebound also apply to on-road cars. If you have enough choice of damping (different pistons) then there is no need for the changes to chassis flex featured on some cars. However, you'll need a lot of pistons, a range of 'letter' drills and not a little patience to work it all out. Good luck!

[discostu]

tc racing just use either 1.1 or 1.2mm pistons 3 holes you wont be far wrong i ran 1.2 in my rdx phi and it was perfect.

stu rand

[Lee Dyson]

Thanks all for your replies. Based on the replies its seems pretty worthwhile drilling the pistons as pack isnt really needed.

Makes sense with the three hole pistons my car currently seems too 'overdamped' using kit 2 hole pistons with 40 weight oil so will change and stick to using three hole pistons (preferably get a bunch drilled to 1.1mm and 1.2mm) and see how things go; fingers crossed it should give the car a better 'feel'.

Which brings me to another question: what sort of oil are people using in general is it anywhere from 30wt to 40wt? Is there any difference in visocity using 40wt schumacher oil for example compared to 40wt much more, 40wt losi etc?


Thanks again