Belt Tensioner Pulley Wobble

[highway7]

That's normal, also never seen that on another car before, but yes it's 'normal' on the FA20 and mine does it too

[Tcoat]

Originally Posted by highway7

That's normal, also never seen that on another car before, but yes it's 'normal' on the FA20 and mine does it too

Never seen a bouncing tensioner before? Most of the cars I had in the last 15 years or so do it.

[Ultramaroon]

Originally Posted by highway7

That's normal, also never seen that on another car before, but yes it's 'normal' on the FA20 and mine does it too

You are used to seeing either manually adjustable, or damped tensioners. All three are an equally valid approach to the problem based on where the tensioner lives in the belt path.

[kowalski]

Originally Posted by hyper4mance

Is this normal for the tensioner pulley to wobble between the power steering pulley and crank pulley? (...) Thoughts?

Can not say for sure if it is normal. But mine does the exact same thing on a JSRC supercharged brz. It worried me a little, as I had smell some gas form the injectors on the drivers side and was checking all around for leaks, car seems to have lost a little power on low revs. But I never noticed that tensioner wobbling at idle. In fact, if you do search some videos of FA20 not every FA20 wobbles like that at idle. In any case, I am glad to know that this is no reason for concern (unless the belt starts slapping the pulley above).

[Ultramaroon]

Originally Posted by kowalski

Can not say for sure if it is normal. But mine does the exact same thing on a JSRC supercharged brz.

A supercharger changes the picture, [especially with respect to rough idle.] They all have a great deal of rotating inertia which will continue to pull the belt while the crankshaft is hiccuping. This causes the belt to go slack between the supercharger pulley and the harmonic balancer. I've seen belts jump and shred.


The movement in OP's clip is normal because it is periodic with respect to the entire belt.

[scion fr-s]

Originally Posted by kowalski

Can not say for sure if it is normal. But mine does the exact same thing on a JSRC supercharged brz. It worried me a little, as I had smell some gas form the injectors on the drivers side and was checking all around for leaks, car seems to have lost a little power on low revs. But I never noticed that tensioner wobbling at idle. In fact, if you do search some videos of FA20 not every FA20 wobbles like that at idle. In any case, I am glad to know that this is no reason for concern (unless the belt starts slapping the pulley above).

I have the same issue as you regarding the lost power at low revs and the fuel smell on the driver side. Glad it is not just me. Did you ever figure out a solution? Thanks.