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Discussion Starter · #1 ·
I was originally going to try to install the pulley with the help of my fairly mechanically skilled friend Tim. We talked about it and
I decided to take it to Auto Enhancement here is Fresno...they said it would be $60 bucks which was worth it to me. Apparently the installers (two guys were working on it) couldn't get one of the belts on...no matter what they tried. The Gates belts that are recommended are included in the installation instructions. Gates belt KO40335
did fit. The other one KO40325 would not. The guys at Auto Enhancement called unorthodox and got into a lively discussion with someone there<img src=/images/forums/snitz/eek.gif width=15 height=15 border=0> telling him that the one belt was wrong. They apparently went back and forth. In the end they ran out to an auto supply and came back with a "Drive Rite automotive v-ribbed belt" # 315K4. They said it fit fine and installed it. I don't know why they had trouble getting
the second belt to fit. I believe that Brendan used those belts on his Elantra...BUT, his is a different year...2000 I believe...mine is an
'02. So, just a heads up to all you
pulley buyers. Do I like the Pulley?
Oh yeah. The car sounded and felt different from the get-go. It feels lighter on it's feet (ok tires) and
more responsive. Now, remembering the pre-pulley performance, it seemed a little sluggish before. It just seems more eager now
throughout the rpm range...and yes,
faster. <img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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Has the pulley made any difference to the powers steering, air con or headlight brightness?


<hr width=60% noshade size=1 align=left><A HREF="http://members.tripod.co.uk/Xorro/ukhcs/mycoupe.htm"><IMG SRC="http://members.tripod.co.uk/Xorro/temp/mine3.jpg"></A> <A HREF="http://www.hyundaicoupe.info"><IMG SRC="http://freespace.virgin.net/the.worx/coupe/pix/ukhcs01.gif"></A>
 

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Discussion Starter · #3 ·
I haven't actually stood outside the car and looked at the lights. I will do that tommorrow though. The
heater functions normally, near as I can tell, but I haven't used the A/C
at all...ever. I got the car in late November.<img src=/images/forums/snitz/wink.gif width=15 height=15 border=0>Now that you mention it, I did notice today that the steering felt different, better, less assisted. Maybe there is less power assist to the steering wheel now, I hope so, I liked the GT's less assisted steering. Everything seems pretty normal really....except that the car is faster! <img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>


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They pulley works fine till you put a 500 w stereo in it.


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underdrive pulley = going fast/foregoing "comforts" (esp if its a REAL u.p.)

500w stereo = crusing, nice sound, performance optional

if u REALLY wanna go fast u don't want the weight of that added stereo crap. if u plan on carrying people to listen to ur system, ur prolly gonna rather have that bit of low-end torque ur gonna loose with the pulley (yea u loose a lil)

if u've got a stereo why are u worried about a pulleys.. unless uve already got header, exhaust, bbtb, bim.. they're like a high expense/low gain mod..that u do when uve done everything else and want to squeeze the last drops of hp out




<hr width=60% noshade size=1 align=left>No more rinky-dink mods, getting a job, saving till summer = Beta!
 

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woah! hold up... you lose low end torque with the ur pulley???? us automatics NEED that low end torque<img src=/images/forums/snitz/eek.gif width=15 height=15 border=0>


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How do you know you loose torque? Where did you get info? I have a 12 inch sub and 500watt amp, no tproblems yet, and yes the light s will go a little dim, as soon as you press on the gas pedal, the lights will brighten a little. No big deal! When I really have bass and music up the lights dim a bit more, that is normal if you don't have a capacitor.<img src=/images/forums/snitz/cool.gif width=15 height=15 border=0>


<hr width=60% noshade size=1 align=left>Apex springs,BSA rims,Toyo tires,AOS intake, UR Crank Pulley, grape shooter, OBX Fr strut bar, Shark clear corners, APC gauges. KORE wires,.. blah,.. blah, blah, kICKER 12" AND AMP.
Body kit soon, and hopefully Catcams?
 

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Discussion Starter · #8 ·
I have seen anything about UR pulley
on dyno that shows a loss of torque...not yet anyhow. I don't know what kind of hp gains peeps are supposedly getting form exhaust. But if its more than the 6-10 hp at the wheels the U.R. Pulley gets on dyno
I'd love to hear the details. <img src=/images/forums/snitz/uhh.gif width=15 height=15 border=0>


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Discussion Starter · #9 ·
I haven't seen anything about UR pulley
on dyno that shows a loss of torque...not yet anyhow. I don't know what kind of hp gains peeps are supposedly getting from exhaust. But if its more than the 6-10 hp at the wheels the U.R. Pulley gets on dyno
I'd love to hear the details. <img src=/images/forums/snitz/uhh.gif width=15 height=15 border=0><img src=/images/forums/snitz/oogle.gif width=15 height=15 border=0>


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i read somewhere (on here) that you loose a tiny bit of low-end torque with any aftermarket pulley. i know i read it..but i dunno how acurate the source was..


<hr width=60% noshade size=1 align=left>No more rinky-dink mods, getting a job, saving till summer = Beta!
 

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There is no loss in torque with an underdrive pulley. All dyno graphs I have seen show a solid torque gain throughout the power curve.

My Z3 showed 7 hp and 11 ftlbs of torque gain over stock.


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thanks Cheuk,... I try to research and get alot of feedback before I give advice that may improve performance. That is how I came to get the UR crank pulley. I ordered CATCAMS that are made by the same named company out of BELGIUM. There distributor in Canada had a Hyundai Tuner from Quebec apply it and a Crank Pulley. No other mods and it got 14hp at the wheels. Has tested 13 applications from the catcams on different vehicle.
Any thoughts ??<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


<hr width=60% noshade size=1 align=left>Apex springs,BSA rims,Toyo tires,AOS intake, UR Crank Pulley, grape shooter, OBX Fr strut bar, Shark clear corners, APC gauges. KORE wires,.. blah,.. blah, blah, kICKER 12" AND AMP.
Body kit soon, and hopefully Catcams?
 

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If the UR pulley is of a smaller diameter than the stock one, then it'll mean that all the belts will need changing including the s/c belts?? Right?

However, would using the UR pulley with the s/c have a detrimental effect on the engine or performance - or would it help to reduce the parastic drag on the crank caused by the s/c?

<img src=/images/forums/snitz/oogle.gif width=15 height=15 border=0>


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It will spin the S/C slower and create less boost. If you get an underdrive pulley, you'll also need to get a smaller pulley for the blower to compensate.


<hr width=60% noshade size=1 align=left>Later,
Aaron Britt
Events Coordinator, Las Vegas F-body Assoc.
'97 Trans-Am WS6
'96 Elantra GLS
"The shortest distance between two points is a straight line........but, it's not as much fun."
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The UR pulley will boost top end horse power slightly, but will improve low end torque indefinetly. Torque is the twisting force per revolution, because of the lightened wieght at the crank the engine will rev up easier in a lower gear. The faster it revs up the sooner more HP is available to the wheels. This leads to the low end HP gain since HP is merely Torque*RPM. 1st and 2nd there will be noticeable differences because you rev through these gears quickly. As you switch to higher gears, the RPM change per second, in the engine, is less. This means that wieght at the crank doesnt matter is much, because it's velocity is not changing. So for exmaple in 3rd gear or higher, there will be "virtually" no difference with or without a pulley. The only slight advantage pulley users will have will come from the smaller diameter of the pulley meaning the water/steering pump are sucking less energy because they are turning slower. The alternator however will always comsume the same amount of energy (HP) no matter how fast it turns. It is a direct reflection of the amount of electrical energy you are using in your car. For example, If it is only turning at 5 RPM is may require 10 ft/lbs of torque to produce 100W, however if it is turning at 50 RPM it would only require 1 ft/lb of torque to produce the same power. I hope this clears things up a bit. BTW the pulley may not help *too* much at the drag strip, but it definetly makes your car more driveable day to day.<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>
Good luck with the tuning guys,
-Steve


<hr width=60% noshade size=1 align=left>2k1 Tiburon SE
5 spd
CAI, KORE CATBACK
58mm TB
 

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It sounds too me if u.d. pullys let the motor spool faster and get to the torque faster this would be an AWSOME upgrade for auto cars right?? cause thats what i got an auto. <img src=/images/forums/snitz/wink.gif width=15 height=15 border=0>


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Discussion Starter · #18 ·
The underdrive pulley would help manual or auto, but probably benefit
the manual more if Brendan's theory
about parasitic loss is true. Also,
the degree of "help" at the drag strip is subjective and relative.
Is .5 seconds a lot? It is if you think it is. I personally think so.
Looking at the pulley from a mathematical perspective I can see that kind of gain...assuming, for instance, a gain of 4 hp and 4 ft/lbs torque at the wheels on a Tib
or Elantra. The difference would be closer to .3 seconds 0-60. So, I figured that if Elantras can manage
low 16's in most road tests the pulley alone could nudge my car into the high 15's no prob. Besides, a lot of races are won or lost by a car length or two...and thats the kind of gap this mod can bridge.
<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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Discussion Starter · #20 ·
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