if i am to get a lightweight pulley for the tC, is it just ONE pulley or is there multiple? and if anyone can recommend one, power increase numbers are a plus, thanks.

 

ok...there are multiple pulleys u can order.

there is the crank pulley, comes in two styles...regular, underdrive(underdrive slows down ac, alt, and others giving u more hp at wheels)(reg is good for s/c cars)

THere is also the lightweight alternator overdrive pulley(speeds up alternator, give ya more juice)

and lastly, the lite weight water pump(regular drive, just reduces rotating mass

a crank pulley adds about 7-10 hp and 7-10 torque, just depnds. as for the others, i know of no dynos yet


dont worry about repeating questions...sometims it cant be avoided

 

thanks.

 

A lightened pulley adds nothing in terms of hp or tq. It allows the motor to spin a little easier by reducing rotating mass, but that's it. You'll shed about a pound while losing the dampener on the acc. end of the crank, so you'll be putting undue stress on the entire motor.

If you want to reduce rotating mass, look at the other end of the crank and get a lightened flywheel. You'll shave about 10lbs with no ill effects at all.

 

In my experience over the past few years pulleys are a very cheap and worthwhile mod. The gains per $$$ are very good an noticeable compared to other mods in the price range. Some people say they will blow your motor up within a few miles, few thousand miles, or few tens of thousands of miles. I haven't seen any blown motors as a result.

A good crank pulley will give you about 7-10 horsepower according to the guys over at NonStopTuning. There are two types of crank pulleys:

Lightweight stock sized crank pulleys weigh much less than stock pulleys and will give you better throttle response. Lightweight underdrive crank pulleys are lighter than stock and slow down the accessories to free up a little extra power to send to the wheels. Underdrive crank pulleys are not recommended for supercharged cars because slowing down the supercharger means less boost but they are very good for n/a and turbo cars.

Accessory pulleys that are built lighter than stock pulleys fall into the same category as lightweight crank pulleys. Less rotating mass leads to better throttle response.

Unorthodox Racing, ZPI, Agency Power, and NST are all companies that make pulleys for the tC right now. I recommend NST hands down

 

^^I on the other hand, have seen a lot of blown motors from the pulleys. Both on this forum with tC's and also with many other cars. As a matter of fact, one guy on here blew his motor twice be4 realizing what it was from.

 

who??

i dont know of any tC DIRECTLY blwon from the pulley(as in it was the only mod)

 

i can't remember, the last one isaw on this forum was early last year and in that topic a few other people told of their stories...i tried searching for it right now and it's not under the things i tried but i do remember it.

 

Try this thread. I seem to remember the pics of demolished main bearings and such around post 200 or so, and a pic of a wonderfully chipped ZPI pulley a little bit after that.

 

then tell me why all light weight crank pully manufactures show dyno proven power increases.

this increases power because there is less rotating mass that the engine has to fight off. this is why it revs up faster. because there is less drag.

 

Are you actually quoting the dyno figures from crank pulley manufacturers? Seriously? Based on that logic, is there anything you won't beleive? If I had a dyno showing that super-gluing a Slinky to the dash would add 3whp, would you run out and buy a Slinky and some glue?

This returns straight back to the fact that a dyno is in no way indicative of real world performance. But I guess in the end, there's only one sure solution: find out for yourself.

 

nice find on that thread Dr...i appreciate the backing on that...unfortunately i'm not a mechanic so i don't know exactly why it's bad, but my mechanic friends all tell me not to get it. And i will take their word for it! Again thanx for the thread

 

you can believe whatever you want. the fact is they are the only ones with any kind of proof. So I will believe them over you and others who just run their mouths and act they know they what they are talking about.

 

You are (not surprisingly) missing the point entirely. They do not have "proof". They want to sell you parts. They will find numbers conducive to doing so. Find an independent party who will show consistent gains in ET and/or trap speed, with no potential side effects, and then you have proof. I've seen the results of snapped oil pump drives. Does the reward outweigh the risk? On a street car, no way in hell.

It's trashcan engineering at it's very worst.

 

ok, i'll go re-drag my car after i get my pulley....

its common snese...less, faster car, given any scenaio...theres no CREATION of horsepower, just frees up the engine, so it gets more hp to the wheels, and runs easier...same idea a lightweight flywheel

oh and the 2AZ-FE is internally balanced i believe...there is a thread with about 40-50 tc owners with pulleys and no-one has had problems, as oh yet, and many have a lot of miles with the pulley. I've seen the crank pulley...its not a sophisticated lookin device, and several other cars run solid steel pulleys(there are several acuras i belive that have factory solid(no balancing) pullies

I understand the effects of removing a harmonic balancer...i have read that thread i dont know how many times over and over again...it proves true on many, many v-8s, v06's, but I-4s act a little different, especially the tCs...i've talked to several mechanics(not toyota specific ones) and they can not directly relate the problems to the pulley

until i see OFFICIAL, PROVEN results the the pulley is the DIRECT and ONLY effect on the engine's demise, then will i remove mine(although its not on yet, as i dont have the device to pull the original one off with...)

ok, now to get back on topic, before this gets deleted and locked...

 

well then show your proof.

I got your point. mine is you have none. and you have no way to prove those dynos are wrong. so untill you do I stand behind my argument.

I am always open to new facts and will admit when I am wrong. so when you get them I will say I was wrong and retract my statement.

 

I would also like to know why this is poor engineering, yet a light weight flywheel (has the same concept) is in no way going to have the same effect.

 

The pulley has nothing to do with balancing-- it's a harmonic dampener. Eventually, the pulses from the crank will break something.

Yes, several Hondas and Acuras run solid pullies. But you're comparing apples to pears. They can run lightweight, solid pullies, because the motors were designed that way. The motor in the tC was not.

 

see no thats what I am talking about.

you came up with a reasonable argument and you won. now lets see more of it. from everyone.

and thanks for the info. I am a honda tech (meaning yes toyota shares alot, I mean alot in commen with honda) but I did not know these pullies had dampners in them. this was never to brought to my attention or I just ignored it.

 

i doubt that it does, jsut looking at it...i'm not an expert, or a tech....i still dont believe(nor do many ppl i know) that this will cuase damage, and i was told(i believe by ZPI) that the TC is internally balanced...


BUt i'm not going to drag this useless, senseless arugement out anymore, as no tC has been around long enough under the perfect conditions to jsutify a claim either way regarding to the tc specifically