Update:
I ended up putting the idler pulley back in its original position after I noticed some rubber wear from the belt. The alignment must have been off. I am not sure exactly where it was rubbing.

I have a 62mm supercharger pulley going on eventually, so I made need to revisit the belt wrap issue to avoid slippage. That means either figuring out why moving the idler pulley was causing belt wear, or getting a Needswings pulley saver kit.

 

I did this and have spaced the pulley out with a washer to match the s/c and alt position and have had no issues...... I run the 62mm pulley presently. No slippage and no abnormal wear on the belt and you can retain the original belt!

 

I found this smooth pulley that looks like it might fit in place of the grooved one.


ATTRIBUTES SPECIFICATIONS
No. of Bearings 1
Flange N
Bearing ID 1 (mm) 8
Pulley Material Polymer
Pulley Type Serpentine
Flat Y
Max Belt Width 06 Rib
Pulley Diameter (mm) 65
Pulley Width (mm) 25

89178

Here's a Uro pulley that's less expensive than the Dayco.

 

Here's a smaller one with a bolt but it doesn't say what size the bolt is.


ATTRIBUTES SPECIFICATIONS
No. of Bearings 1
Flange N
Bearing ID 1 (mm)
Pulley Material Polymer
Pulley Type Serpentine Assy.
Flat Y
Max Belt Width 07 Rib
Pulley Diameter (mm) 60
Pulley Width (mm) 28

 

The answer to this is buy a stock grooved pulley just like the grooved idler, then put one of them on a lathe and cut the grooves off of it. This one goes in the idler position, the grooved one goes in the new position, that way you have a setup where the belt cannot slip off. An additional support might be helpful, check my setup below.

 

So the consensus is that no one has found a smooth pulley that doesn't need to be lathed down?

I don't have access to a lathe. So if I were to buy a new stock grooved pulley who would be able top grind it down so it is smooth? A wood shop, machine shop?

 

Either one would be able to do it but I would take the machine shop as they would be a bit more precise.

 

FYI coming up on 7 years this mod without any issues.
Think it's safe to say it works!

 

Yes, that was a great idea, thanks for your contributions to the forum, you have added a lot.

 

Does the original first post needed to be updated with new info?

 

Tried to PM you tighed1, but your inbox is filled up.
My Poland 65mm steel pulley came in the mail and I have been reading about your DIY belt wrap kit.

^^Is that a SRT-6 factory supercharger idler pulley? I searched SRT-6 and C32 AMG and that part number never came up for the idler pulley which I thought was odd.


So that is the correct pulley to order and the same one you have ran for 7 years? I noticed you made it smooth, is this necessary?

EDIT Read through the entire thread.

For one: The RockAuto part number listed does not show it being a SRT-6 supercharger idler pulley.
2: This entire thread is mainly for people running stacked pulleys. Since there was a member that tried it with a just a 65mm and the belt rubbed. Also there was a member that needed spacers.
Seems like the best bet for people with just a 65mm pulley is to get the NeedsWings Pulley Saver Kit. Not sure if that is overkill or even needed with just a 65mm pulley.

 

My be a stupid question but is this mod only for under size SC pulleys or would it help a SC with a stock pulley.
Thanks

 

I think that this thread needs an update specifically stating what should be done and the specific parts for the various pulley set ups.
This might save some people grief and injury.
I read the whole post and ended up a little confused as to the correct action to be taken for an OEM set up let alone any SC pulley changes.

 

Me too

 

I have the parts to do this...and even the belt. I need to talk to DJ and put them all together and sell them. The kit works. I just decided to do Rob's instead on both the cars. I have the bolt, pulley and belt for a 65 mm install, but I am sure it will work with a stock pulley as well, just need get the belt figured out.

 

I like your solution Tighed. Will probably go same with 178/65C3 in my SLK32 in the next month or three.
I presume your'e still running the 181/65C3?
Do you have any logged boost and/or fuel cons figures at WOT?
At a stretch do you have an AFR paired with any of the above figures?
Stock Belt?
Tune?
Stock injectors?

 

Still running the DIY Belt Wrap on the coupe (181/65) and the vert (192 crank).
No logs but do have AFR meters to keep an eye on things.
Stock belt on the coupe, little longer on the vert.
Mail order tunes on both.
Completely stock fuel systems.

 

Sorry Tighed - DCAI or single?

 

Stock intake on the Roadster (192mm)
More Air Intake and DIY Performance Intake on the Coupe (stacked)

 

Is there a new update on the your pulley wrap. For a 65mm pulley.
List of parts needed.
And part numbers if possible.
THANKS