iv eheard horor stories aboiut how the lighter crank pullies can cause your engine to F itsself. well has anyone iwth an xA/xB actully experanced and be honest dont lie to try anda support your stance on the issue. im just lookin for facts here.

 

Excellent question. I will be watching this thread closely. I will be picking up my Perrin lightweight pulley next week. A friend of mine has been driving with a custom made underdrive pulley on his xB for almost a year with no problems at all.

 

i think you run into problems when the size of the pulley is altered, not the weight. but then again i'm only going on what i've read here on sl.

 

ive proably read the same stuff as you guys and ive also red here that there is a harmonic balencer in the 1.5 lt engine because its not interinally ballenced. but i hav eno way of finding out myself but this might also be a myth created by those who are so intrenched in their beleif that they are spewing crap to generate support for their side. this issue is so perosnall i just want pure facts ya know? hey peruzziscion can you go talk to your master machanic and see what he says

 

Bump to watch

 

You want me to ask about the harmonic balancer or just about the pulleys in general? I'll warn you my master tech doesnt really like me that much cause Im a "modding little punk" as he would put it and I drive an echo. He won't call it an xB and thinks Scion is Japanese for Sucks. I'll see what I can get out of him though....

 

ok ask him if the pully is the harmonic ballencer for hte engine or if the engine is interionally ballenced

 

anyone have any information about my above question?

 

something i have read on wrx fourms is that the pullies arne causing hte damage its people oer torqing them since they are made out of light weight materieals aka alu. they can worp easily cauzing teh proplems people on these fourms might be having... im just trying to figure out this problem insted of blaming it on things with no evidence byond a gut feeling or what your told.

 

If you read on the Unorthodox Racing site, which the last time I check was in realy small letters, they state that the pulley has been lightened quite extensively, but still maintains operating within manufacturer specs. I have had unorthodox racing pullies on all my past vehicles and have had no problems with them at all. Now, I can tell for certain that if you start to underdrive certain things and overdrive certain things to extremes, with ebay-esque pullies, you can damage the alternator and power steering and all that, now this being with the pulley set, not just the crank pulley.

 

how long have you had it on your xb and how many miles, and did you get a seat of your pants diffreance in power?

 

I have read, but can not substantiate first hand, that the pulley mod is the one mod that will absolutely give you fits with your warranty.

 

Perrin Lightweight Pully was nstalled 3 months ago. All was well until I had a few drips of oil on my garage floor. Dealer says that it is not the oil pan gasket, and may be the pully seal. I will be watching it and will post a thread about this specfic problem, I installed it myself and all went well, pin was fine and pully fit well.
At the dealer, they cleaned the motor bottom with brake cleaner, checked the oil pan, (I had a local garage tell me that the leak was the oil pan). Miller Toyota/Scion lifted the car while the motor was running and the pully looked fine while in motion.
What am I gonna do? OY!

 

one you might have over tourqued the pully and cause it to have a few lsight woarps which might have contributed to your leek.... or it might be totally unrelated put the stock one bkac on and go to a diffrent dealer and see what they say

 

The 1.5L engine does not have a harmonic ballancer. It is internally ballanced. That is straight from a tech who has worked on Toyotas for 15 years. He also told me changing the pulley to a lightened one shouldnt effect anything as far as causing problems. He did say an underdrive pulley has the potential to isolate and rapidly increase any defects in the drivetrain since you are then overtaxing the engine. He warned against underdrive...

 

ahha! straight from the horses freakin mouth... i feel like im on myth busters! seems like this myth is on the way to being busted

 

Keep in mind every engine is different and will have different outcomes with each mod you do it. Some engines will just naturally take more abuse than others even though they seem the same. Thats is really the reason I think some people have issues and other people dont. When you think about this 1.5L engine it was never intended to be highly modded or raced. Its designed to be as economical as possible. Performing any mods to it means your'e taking a huge risk no matter how simple it may seem...

 

this is also true with headers or an intake but my main reason for doi tihs thred was to get a final anser to this question and battle that has plegued tihs fourm hopefully tihs will lay to rest all the arugument thats been caused over such a small thing

 

i have the agency power lightened crank pulley, and i have had NO issues with it so far. it's been on for over 3 months. it did help my engine rev better, but nothing negative so far.

 

i love this pulley alot all though i did knick it some during the install but its all good