Yellow vs Red Koni's

[Alfetta77]

Hi everyone, does anyone know what the difference is between Red and Yellow Koni shocks? - I have seen both used on Alfetta GTV's. Thanks, Mark

[SimonR]

I believe Koni yellows start 20% stiffer as standard compared to Koni Reds.

My Alfetta has the yellows and these were were rebuilt and re-valved to match the 30mm torsion bars and stiffer rear springs and I have used this car on track plus lots of city and country driving on poor bumpy roads and they are fantastic for both.
My Spider has the reds and suit it perfectly.

I think it depends on how you prefer to drive and the roads used etc. Brand new both are great.

[pafiat]

ditto that. Yellows with standard suspension are stiff.

[Alfetta77]

Perfect, thanks both!

[Colin Edwards]

As the graph suggests, the Yellow rebound can be adjusted "down" to within the red range and the Red rebound can be adjusted "up" into the yellow range.  This is low speed damping only.  The high speed damping is not adjustable on either the red or yellow.  They both need to be dismantled to be re-valved/re-disced.  High speed damping has a greater influence on ride quality than low speed.

I fitted yellows to my 159 3.2 AWD Ti.  With "standard" Ti springs the front yellows seemed excellent at around 66% < 75% full hard.  The fronts are externally adjustable.  Decided on 50% hard for the rear.
On my 75, the front yellows are 80% full hard and rears 66% full hard.  29mm bars on the front and Eibach springs on the rear.