underdrive pulleys
11-14-09, 03:15 PM
#77
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ok. i talked to the shop that installed my belt. they did install the suggested belts. so i do not have a belt that is .75 bigger. i looked under the hood at the belts & sure enough both of them are the suggested gates belts. i have adjusted the tension bolt myself. it seems to only squeal when i turn the a/c on. so they said it needs to be adjusted. i have a scheduled appt. on mon. thanks though dude cause i been wondering about having that bigger belt on. then the site went down...i been going nutzzzz!!! waiting to hear how your install went. but i feel allot better knowing the right belts are on. i hope it stops squeaking!
ahhhh & your most welcome about sharing the pulley find. i am very happy i found this forum & am glad i could help as i know you & most others would do the same.
ahhhh & your most welcome about sharing the pulley find. i am very happy i found this forum & am glad i could help as i know you & most others would do the same.
Last edited by sagarx; 11-14-09 at 03:18 PM.
11-15-09, 08:52 AM
#79
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now that it has been a couple of days i wouldn't say 10hp but i gained a few. why do you say stick with the oem. if i am hurting my engine, i have no problem switching back to the oem.
11-15-09, 09:20 AM
#80
Replacing the pulley is a bad rep for most cars because the harmonic damper and pulley are a single unit. When you throw in an aftermarket pulley, it usually meant you're throwing out the damper also. Without the damper, you run the risk of vibrations within the crankshaft that may lead to spun bearings.
I haven't worked on the ES300 yet, but if the dampers are separate from the pulley, replacing the pulley while leaving on the damper shouldn't be a problem. Throwing on a 1-piece solid pulley to replace both OEM pulley and damper is a bad idea. Most aftermarket brands use this kind of pulley since it's cheaper to produce. But by the time they throw in a damper large enough that's remotely useful, the total weight will be close the OEM unit.
I haven't worked on the ES300 yet, but if the dampers are separate from the pulley, replacing the pulley while leaving on the damper shouldn't be a problem. Throwing on a 1-piece solid pulley to replace both OEM pulley and damper is a bad idea. Most aftermarket brands use this kind of pulley since it's cheaper to produce. But by the time they throw in a damper large enough that's remotely useful, the total weight will be close the OEM unit.
11-15-09, 09:50 AM
#81
The Lexus service tech only replaced the pulley and the damper and harmonic balancer are separate from the pulley and were left in place. I had the tech save everything he removed and all he removed was the two belts and the OEM pulley, everything else was left in place. I have no vibration issues at all and according to NST website, they state anywhere from 7-10 hp gain.
11-15-09, 09:56 AM
#82
As long as the damper is left in place, you should be good.
As far as power gains, it varies from car to car. Guys with lightened flywheels dont' normally dyno that much higher than stock, and the flywheel has a lot more inertia than the crank pulley.
Only way to find out is to take it to the track
As far as power gains, it varies from car to car. Guys with lightened flywheels dont' normally dyno that much higher than stock, and the flywheel has a lot more inertia than the crank pulley.
Only way to find out is to take it to the track
11-15-09, 12:00 PM
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only thing taken off my var was the oem pulley & belts. my squeaking issue is getting better by the day so i am starting to think it is just the belt wearing in. i did give it a lil tightning,but all seems well. if any body can give me a fact as to how this pulley is hurting my engine i ask you to please do so, cause it aint worth a new engine to me.
11-16-09, 11:41 AM
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well all is well now. took car back to shop. small 5min. adjustment to tighten drive belt...no more squeak at all & a lil better throttle response as well. so happy no more squeak!!
