Thread: 8 rib help! asap please!

Hey guys. I installed an 8 rib setup and when the car idles down in gear only there a rubbing sound and the belt jumps a little. Tried moving the MPS hub in and out, nothing worked. Tried messing with the new idlers and put a new tensioner on. Still nothing. Im running out of ideas. Maybe idle is set too low in the tune? Any help would be appreciated.

ok. heres a video to help explain whats going on.Pictures by kamper98 - Photobucket

No one has any insight?

i have no idea unless the spring in your tensioner isnt strong enough, but that doesnt make sense to me. it seems like it is slipping on the crank pulley or something.

No it doesnt feel like its missing. I took the s/c belt off and it runs absolutely perfect. This is what really puzzles me. I even put the 6 rib belt on it and it still does it so i know its not the belt thats hitting. I was leaning towards one of the 8 rib idler pulleys. i wouldnt think the crank pulley would be messed up?

are any of the idlers stuck? maybe you tightened one down too much?

Ill check the idlers out tonight and let you guys know what i find. Thanks for the help.

Idlers seem to be running good. I emailed zzp about this and sent them the video and i got a reply of " its a misfire." I guess i dont see how this could be a misfire cause if you take the s/c belt off it runs smooth as can be. And when it is idling the s/c belt is the only one that does this. I just finished rebuilding the snout today and that didnt help any. Any other ideas?

when you take off the blower belt, does the supercharger pulley still spin on its own? if not, it is possible that you tightened down the blower funny and it is binding. that would be VERY bad if youre running the car like that.

Yeah you can take the belt off and spin the s/c by hand

does it feel like it is binding anywhere?

No it doesnt feel like it is binding. i though the same thing thats why i rebuilt the snout, but it didnt help any with the belt jumping.

im out of ideas...

Thanks for all the help though! Really appreciate it

Here are the things I would check.

Belt tension
Pulley alignments
Pulley movement
Belt type and length

If all of that check out then there's no reason it shouldn't work.

ok, Belt tension: New tensioner
Belt size: had a 08685 went to a 08680. no effect
Pulley movement: doesnt seem to turn really hard or really loose that i have noticed. took them off and spun them by hand, spun about 2 or 2.5 turns.
Alignment: should be the same as the old setup using the same mounting correct?

Also do you think this could be caused by the balancer?

Originally Posted by kamper98

Also do you think this could be caused by the balancer?

Unless it's slipping on the balancer, I don't see how it could do it to the SC belt and not the accessories belt.

Thats kinda what i was thinking too. I really dont know what to do.

What balancer are you using?