Yaris_WRC

ANy one here boosted and using an aftermarket lightweight pulley? i have a Perrin pulley ut dont want to install it because i have heard a few bad reports of things going wrong with crank resonating frequencies.

althought there is lots of good reports, its the few bad ones that make the difference.
i dont want to run forced induction with the pulley if its going to accelerate the propblem occuring.

Any advice is much appreciated.

would it be posible to get a custom pulley made that comes with the little rubbber ring integrated into it.

how exactly is the standard pulley made? does that rubber ring run all the way across the puelly or what?

vintage42

It sounds like last summer's thread on that subject has become misunderstood. The stock pulley is a damper with a rubber component, but is not vital to the engine. It helps dampen the buzzy vibrations inherent in a 4-cylinder engine. Such vibrations are from the firing order, not from any internal mechanical imbalance, so there should be no harm in changing to a undamped pulley. When people replace it with the Perrin, they never say anything about feeling any difference in vibration, so the rubber engine mounts must isolate the engine good enough for the Perrin types.

metal112524

Billy (proshopxb) was runnin ZPI's pulley, but his kit is off now, Maybe best to more to FI but ill leave it up to u or the mods. But for real, he'll post his opinion soon enough ;P

dgHotLava

running a SC and have the perrin lw crank pulley...

no problems...no extra vibration can be felt...

been running it for 2 yrs now...not a single issue.

Yaris_WRC

thanks for all your feeback.

I am just cautious about what mods to put on my car as it means the world to me and cant afford a major component failure

ProshopXB

I had no problems with my lightweight pulley while being turboed... Only had faster revs... and a great spool..

Yaris_WRC

thats ok, so im not going to drive the car in anger and after 1000 miles the engine will have vibrated its self to pieces

vintage42

That is not a problem:
1. The vibration is due to the firing order and not due to any mechanical imbalance which could hurt the engine.
2. The OEM damper pulley is not for the benefit of the engine, but for the benefit of the occupants, to give them the smoothest and quietest experience, so they don't perceive the engine as "buzzy".
3. Some who have the Perrin pulley say they can't feel any increase in vibration. And some have used the Perrin for tens of thousands of miles.

I do not want the Perrin for the following reasons:
1. I value the reasons for which Toyota equipped the engine with a damper pulley, to reduce vibration and harshness, to make the engine as civilized as possible.
2. The Perrin pulley quickens acceleration somewhat. To get the benefit of the Perrin pulley, you need to apply acceleration. The harder and more often you do, the more difference the Perrin will make to you. But I accelerate gently most of the time, to save gas and the car.
3. The Perrin part has a cost, and a professional installation has a cost. Many have also installed a Perrin on their own, however some have encountered the risks of (a) knocking the VVT sensor loose, (b) damaging the oil seal on the crankshaft, or (c) having the pulley key break or loosen. And I do not want either the cost or the risk.

Yaris_WRC

Thank you vintage24 for your imformative and independant answers

fusionscion

i have the perrin pulley on my zpi boosted xB... no problems because of that....

Rocket

I have the Perrin Pulley with the GreedySupercharger.....No Problem..........Go For it!

earpl

nick my perrin pully self distructed last week...........

dgHotLava

you got pics of that???

i'm interested to see it...see where it went bad...

earpl

no thrown it. it sheared the locating pin, then wore the centerhole bigger untill the pully came loose, causing the bolt to come out + the job lot to fall off...... just as i was showing a GTO3000 how much of a boat it was through the twisties

Yaris_WRC

Hey Earpl what do u think caused that to happen?

earpl

vibration in the pully or manufacturing fault, its thrown 7 PS belts in 2500 miles...........

dgHotLava

yea, i'd say there was a major problem with it...

8psiXA

the rubber dampner pully has a reason for being there.. it prolongs the life of your engine.. it takes shock from when your engine fires especially at a high RPM

here is a link to a fluidampr...http://www.slowboyracing.com/more.php?id=5809&

its for a dsm but the concept is the same..

vintage42

The damper is for the benefit of the occupants of the car. The engine is not harmed by its inherent vibrations, any more than a Harley's engine is. When H-D recently dampened its classically-vibrating engines, it was for the sake of the riders, not the engines.

fusionscion

the dampners are a good idea, but they make the car handle weird