johnzhou2476

iTrader: (9)

Quick question. If i'm using 1.1 & 4 hole piston with 35wt oil, what shock oil should I use if switching to 1.2 & 4 hole piston to get the same effect?

johnzhou2476

iTrader: (9)

It's going to be thickher shock oil...that much I know. The question is how much thicker.

gigaplex

iTrader: (2)

If you want the same effect then why bother changing at all?

Nerobro

iTrader: (2)

There's good reasons for this.... But you should know why you're doing it.

So... you can get the same low speed damping by going to a heavier fluid. But high speed will happen at a different piston velocity. So it's not gonna be the same.

The math is something you can look up in machinarys handbook.

LzREngineering

If you have RC crew chief it's easy to simulate different pistons and oils until they give the same damping ratio for a given spring, it also shows the change in damping at different velocities.

Marcos.J

iTrader: (239)

LzREngineering

?
Simulating track conditions is entirely different to calculating damping, which is what we're talking about here.
And it is actually possible (not easy) to simulate track conditions fairly accurately if you have enough data.

johnzhou2476

iTrader: (9)

In my earlier post, I should have said ‘similar’ effect not ‘same’ effect. I’m aware of what I’m doing. The main reason for doing this is that I purchased some machined piston for my Xray T4. Unfortunately, they don’t have it 1.1 & 4 holes only 1.2 & 4 holes. I’m pretty happy with my current shock package so I’m trying to achieve similar effect with 1.2 & 4 holes and going heavier on the shock oil.

I’m sure this can be mathematically calculated, but I’m too dumb for this fancy math and I don't have a machinest handbook ; ).

I’m just looking for a quick ball park answer.

Marcos.J

iTrader: (239)

johnzhou2476

iTrader: (9)

oh yea, i don't have RC Crew Chief. Looks pretty interesting though.

antlockyer

Assuming your 35wt oil is 425CST then 750CST gets you close at high and low speeds.

johnzhou2476

iTrader: (9)

Thank you!