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JRSC belts & pulleys: please discuss it here

49480 Views 819 Replies 63 Participants Last post by  iamsyko
I know a lot of us JRSC guys having or had problems with our belts and pulleys and a lot of time we hijacking other threads because of it, so I thought it was a good idea to start up on a thread just about jrsc belts and pulleys. The thread is not only for current jrsc peeps but also for the newbies as well so they won't get us frustrated asking the same question over and over again.

I'll start off with one question, I read around and found a member who is using a goodyear 070775 belt which is 7 rib and 77.5 inches long. I tried a dayco belt that was 77.5 long and it wasn't even anywhere close to fitting onto the 3.4 pulley. The dayco 78.9 belt fit extremely well for the purpose. What I want to know is that anyone else tried the goodyear 77.5 long on a 3.4 pulley or is it because different makers make belt a little bit different in length.

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I am on my forth belt :p

The first belt shredded because of a pully malfunction so it was replaced under warranty. My second belt shredded bacause I was a dumbass and over tighten it. My third belt disinigrated due to no apparent reason one day after installation...

Anyway I would like to see a list of compatable belts for our chargers...
shaggy said:
I'm with chk............

no disrespect, but it does seem alot of the ppl who installed these kits themselves have had these problems. So i'm wondering if it a simple fix that a person, who normally doesn't work on cars, is missing :dontknow:
The kit is actually really easy to install if you have all the tools. Just time consuming. Sonny helped me install mine and we followed the instructions to the "T". Like I posted earlier my first belt shredded due to a flaw in my tensioner unit. The second was my own fault but the third.... :confused: no clue. Anyway, I have been running this belt and it looks great, I dont think I will have a problem for a long time to come.

h22lude said:
These belts that are not good, are those the ones that come with the kit?

What happens when the belt snaps? Does it do anything to the engine or do you just not have any boost?
Mine has never really snapped in half, I just lose a couple ribs. The car is still drivable but you have to be careful because you run a greater risk of losing the whole belt all together. The last time my belt shredded I lost two ribs but I had to drive the car to work for a week. No problems, I just couldn't be racing around... :driving:
tt061880 said:
okay this is strange, the tensioner bolt that was supplied to me was a 13mm bolt, darn JR can't keep their parts consistent. I guess I can buy a 12mm bolt so I won't have to carry two wrenches at always
My original bolt was a 13 as well but when Jackson sent me a replacement it was 12mm, guess they are switching up their parts...
tt061880 said:
if you mount the AC compressor on and not using it, the power loss could be minimal
It would be minimal indeed. With the ac off the pully on the ac compressor spins freely.
This thread is getting better by the minute :thumbsup:
and isnt our blower the newest gen, specs are probably different for us.
I just lost a rib on my fourth belt!!!! :( :firemad: Now before you tell me its an installation error, this belt was installed by the Jackson Racing R&D department. So WTF!?!?! arg, I am so pissed right now!!! :firemad: :firemad: How come I have gone through four belts and some people are still on their first one???

I took a closer look at the belt in motion and it looks like it is out of allignment.... I think either the tensioner pully or the power steering pully is out of wack. I need to call Keith on monday and see what he says.... Unfortunatly I dont think they will be much help.... ARGGGGGGGGGGGGGGG :firemad: :firemad: :firemad: :firemad:
what kind of allignment? what type of adjustment would need to be made? more detail please...
Mateo said:
one thing is if the belt is over tightend then it will come apart fast...the break in is very that it is done, install it, tighten it, dont start it, crank the motor by hand(i got this right from Oscar J. himself), i do it a least three times, then start the car, run 1 min. check it again...and then i run it 3-5 min @ idle, then drive around normal for a 1/2 hour or so...then again i check it again...remember a tight rubber band will break...and to loose of one will stretch! to get a idea as to how tight it should be check a buddies stock one for comparison or go pop the hood at the local dealer! oh and dont buy the bloody gates it is POS IMA.
I was thinking that the gates belt just cant hold up. I guess I should try another belt. We dont really have a lot of options though.... Any place I can order the belts online?

I notice that on all the belts I lost the ribs blew off of the super charger side (the driver side of the belt). Now that I am missing a rib on half my belt I can see that the belt wants to pull in that direction. I am wondering if the powersteering pully is out of whack. I cant tell by eyeing it though...

Shaggy said:
will find out first thing tomorrow morning exactly what my mech did and I will post up. I know it was very minor but made a world of difference.
Thank you, every bit of advice helps :thumbsup:

K20A2 said:
I almost wonder if he maybe didn't adjust the manifold and the supercharger by losing the bolts that hold it to the head...
Yeah thats a good idea, I am going to call Keith tomorrow and see what he says but I get the feeling he just wants me to go away. They have sent me three replacement belts, I dont think they are going to want to send me another one. But of course the guy they recomended is the one who installed this belt....
K20A2 said:
All of my belts have gone on the supercharger, power steering pump side as well. I have held a straight edge up to the power steering and the supercharger and they are off. I think this only makes a major difference on my car when it is over 10psi but I am going to try and bring it back in line to see if that helps the 3" blower and K24 crank.
Is there anyway to correct this problem? I am only running 5 psi of boost and I have now lost four belts... I dont think jr is going to send me another one, I am going to try tomorrow though....
I just talked to Keith at JR and he restored my faith in that company! They are the best! They are sending me yet another belt and a new Power Steering pully! He says they have ran into this problem before and a new power steering pully fixed the issue. He said they had a bad batch of pullys at one time. Anyway hopefully when I install the new pully and belt I wont have anymore problems :)

He also thanked us for being patient as they work though the problems. If anyone has doubted JR, dont! I have had a ton of problems but they have always been good to me :) thnx JR! :thumbsup:
Ha, I got you beat! He sent me four free belts!
Well I am hoping it will fix my issue. I have always tried to be really nice to Keith, it seems to help me get what I want....
Just be glad are belts dont route like this, that would be insane. I think after one break I would stop using the SC...

2003 Jeep® Grand Cherokee Engine
Today I installed the new PS pully and a new belt. Within 15miles of driving my belt was torn to threads. :( Right before the break I smelt a burning smell. couldn't really tell what it was though... So that was my fith belt. I guess I gotta call JR again tomorrow and see what they say.
Well the good thing I can say is that JR has always been willing to help and has always shipped me what I needed next day for free. I understand this is still a new kit and they have some bugs to work out so I dont mind as long as its not coming out of my pocket. There have been times when I wanted to go back to stock but the JRSC is just too much fun, I love it! when it works of course...
tt061880 said:
sorry to hear that

well JR sent me a belt and I have it on since last saturday. My conclusion for why the original belt that came with kit shred on me was because it was loose and jumped over and shredded. I just had the kit for a few days back then so I didn't know how tight is tight.

From personaly experiences with those belt, I found a way to check if the belt is tight enough and it works for me so for those who have hardtime knowing if the belt is tight or not can try this out.

Whenever I put on a new belt, before I really tighten it, I turn the pulley with my hand to make sure the belt get stretch out from every part of its length and not only by the pulley. Now it sits tight on the pulleys, do the "tighten up and idle" routine for a few minutes. Repeat that routine for a few times, gotta be patient on this issue or u gonna regret for not doing it lol. Now to make sure the belt isn't slipping is very easy, turn your AC on(yes you must turn it on during this or u won't notice the belt slipping) and give your steering wheel a full u-turn either to the left or right. Now step on the gas, don't do it lightly, give it a push. If you hear the belt making that squealing noise then stop and get out and give the tensioner bolt about half a turn. Keep doing so until you won't hear the squealing. Once you can't hear the noise anymore, the belt is definely isn't loose or over tighten either. You can do u-turn routine every so often to make sure your belt isn't loose from stretching overtime. It's the easiest way to tell if a belt is loose IMO.
Seams like a good idea, I will try that when I get another new belt...
same here
I was on the phone with him when you called. He had to put me on hold to talk to you!! :p
Texas-R said:
I loaned this guy my stock JR pulley as a model and he did up a 3.2" and a 3" for me. Quality is better than stock (nice black anodize finish and +-.005" on dimn.) :thumbsup:

Click on "Acura RSX-Integra".

Thanks for the link, I am going to order mine right now :)
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