First Impression of UR Lighten Flywheel and UD Pulley

[stkhoo]

Hi everyone

I have just received my UR flywheel and pulley on Tuesday. After spending half a day's wait at my regular workshop, its all finally in my car. To be honest I took a calculated gamble ordering the parts not knowing if it would fit my 1.6L engine.

After resetting the ECU, I started the car. Idling was pretty bad which I am guessing the loss in weight caused a loss of inertia at the crank. Adjustments was made to the idling nut thingy at the IM that was useless. That is because the ECU will just work its way back to the 800 rpm mark. Adjustments was then made to the SAFC and fuel regulator and now idling is fine.

With a loss of 10 pounds (from 20 pounds) at the flywheel, and another 4 pounds (from 4.50 pounds) at the pulley, acceleration is much much quicker. Touch and go at the 7000 to 7500 RPM feels lighter and the engine responds willingly unlike before. Decceleration is not as drastic as what I have read and told...in fact it was not noticed at all.

I have opted out on the performance clutch in favor of the stock clutch. As I am in sales line that requires me to drive, it would be uncomfortable having to pump a heavy clutch.

[Sunrise_Racer_20]

hey STK!

now would your stock clutch be able to handle your improved weight?
i know they arent the best in the world......

[stkhoo]

Hi SR20

The stock clutch works pretty okay with the improved weight...I must agree with you that its not the best but I have used performance clutch before and getting into a traffic jam with that kind of clutch...its a nightmare to keep pumping.....unless you need a good workout for the left leg..whahahahaaa.

Just to add on to my earlier comment, with the improve weight, it sort of compansates for the slower gear down shift just to prevent gear griding through faster between gear acceleration......

PS: ...oooh I forgot how is your flywheel coming along.....

[Edited by stkhoo on May 15, 2003 11:22 AM]

[Dragonsys]

a 1.6l Tib?? huh??

[stkhoo]

Huh?...what huh?..kekeke....its a 1600cc Beta 2

[Shadohh]

does 1.6L have a cable clutch?


The others (1.8/2.0) have hydralic clutches, so the difference in pedal feel should not be noticable


Flywheels are good.

but UR crnak pulleys are bad.

You engine now has an undampen crank.

The rotational vibration at 3000rpms+

will eventually cause your crank ebaring to wear prematurely.

Now you said you did not want the heavy clutch because of the travel, do you want to be going through engine overhauls as well?

One other thing. If you want to add even more acceleration.

Lightweight p/s pulley and alternator pulleys. they have no dampeners so they wont affect the engine.

[Edited by Shadohh on May 15, 2003 1:39 PM]

[stkhoo]

Hi Shadonhh

I should think that the 1.6L should be the same as the 2.0L Are you saying that even with performance clutch and pressure plate I will not noticed the difference?

I dont actually feel any vibration at 3000 and above. I pretty much understand that this is a pretty debateable area. Ooh well I have already bought it.....I dont really understand when you say:

'Now you said you did not want the heavy clutch because of the travel, do you want to be going through engine overhauls as well?'

Could you elaborate?

[Shadohh]

Now you said you did not want the heavy clutch because of the travel, do you want to be going through engine overhauls as well?'

Point I was trying to make was you are worrying about one problem and not another that is potential more dangerous.

You wont necessarily feel the extra vibration, thanks to ubder soft hyundai motor mounts. But I sure your crank bearings are having fun.

Now dont get me wrong its like this.

Say you put one on an engine properly broken in at 6k miles. brand new.

You may only last 70k miles, rather then say 140k miles without a bearing problem.

It also depends on how often you live in the upper rpm band.

if you granny shift each time you hit 3k, no problem, but then you are not using the affects of the UR pulley, nor are you having any fun.

Just lets put it this way. dont be surprised if you having a bearing problem in 50k-80k miles.

the 1.6L and 2.0L are sorta the same, sorta not.

the 1.6L BETA basically uses the ALPHA tranny and the block is similar to in size to the alpha, IE much smaller.

[lantraluvr]

Originally posted by Shadohh
[body]

the 1.6L BETA basically uses the ALPHA tranny and the block is similar to in size to the alpha, IE much smaller.


[/body]

No sir, I have to disagree. The 2.0, 1.8 and 1.6 Beta are similar in size, except the 2.0 which is, I think, 10-20 mm taller. And the 1.6 has a similar tranny to the other Betas, except for the ratios and the clutch assembly (I think).

Stkhoo:

Where did you get the flywheel and how much? Do you have a part number?

[Edited by lantraluvr on May 18, 2003 1:32 AM]

[stkhoo]

Hi Shadohh

I understand the angle you are coming from based on what I have read in HP and HAM regarding the UD Pulley. However I dont share the theory given. Take for example:

We take a long metallic rod and place a heavy pulley on one end and another rod of similar specification and place a light pulley. Using a hammer and strike the rod in the middle will send vibration through both rods. Continue striking the rod with increasing rate and what will be noticed is that the rod with the heavy pulley will create more vibrations then the lighter as it will take twice as much time for the heavy pulley to stop then the lighter pulley. This vibration will be magnified if the rod is rotating and worse if the pulley is not balanced.

Back to the crankshaft, crank bearings are placed along the crankshaft with a pulley on one end and a flywheel on the other. as the pistons strikes the crankshaft vibrations will be send but the bearing will absorb it. So it does not matter anymore if the pulley or flywheel is light or heavy as it is on two ends of the crankshaft, plus two belts strapped onto the pulley that will cushion vibrations if any. It only matters if it is not balanced.

I do enjoy pushing my Tib everyday and because of my work that requires me to drive alot, the lighten pulley and flywheel actually makes it more enjoyable due to very quick acceleration from stationary as well as gear to gear. The weight of my OEM pulley and flywheel is exactly the same as the 2.0L, and with that weight is a sever weight penalty taking into account that I have 400cc less.

I dont think the OEM engine mounting will be able to absorb all the vibrations and at the end the car will be shaking especially when I hit the 4000 to 6000rpm level (and this rpm range is very frequent for me) pretty much like a warped disc brake would send vibrations up the steering column.

Why I did not want to install the performance clutch even though the 1.6L Beta is the hydraulic system is because it will take more pressure to depress the pressure plate for the clutch to engage. Requiring more pressure will mean that the clutch peddle will become heavier though it may not be as much as the cable setup.

The only difference between the 1.6L and the 2.0L is the piston, con-rod, chamshaft and gear ratio....everything else is the same.

Hi Lantraluvr: The lighten flywheel is from UR at USD500 plus but they are having a discount of 10% for the month of May. Part number is 060710100. I think the Flywheel sold at HP shop is at 8 pounds which is 2 pounds lighter.



[Edited by stkhoo on May 18, 2003 7:58 AM]