FastKat

iTrader: (10)

I found another legitimate use for my milling machine - to slash cut supercharger pulleys! I did this for a friend and he got between 1.5 and 2.5 lbs of boost back. We'll find out if it totally took care of the belt slip issue when he dynos it.







It was a fun and easy project. I'll post back when I find out how it held up on the dyno.

fire67bird

Interesting. I wonder if relief cutting on one side of the channel you milled will allow the belt to dig into the groves you cut some more.

I came across this link when I googled what you were trying to accomplish with the mill groves. Has some good info on how to reduce slip.

http://beltslipsolutions.blogspot.com/

FastKat

iTrader: (10)

Thanks for the link.

Interesting idea on the reliefs. I'll have to look into that. I've never really given much thought to how it worked but now I'm curious!

SilverSS

iTrader: (30)

I hand cut slits on my pulley with a dremel way back in the day. It was ugly but worked well.

Monte4ever

iTrader: (2)

Keep us posted. I want to know how this turns out.

The Alchemist

iTrader: (19)

Interesting. I'd guess that it would reduce the life of the belt by digging into it more, but if it works, then it's worth buying a new belt each year.

Blown06

iTrader: (32)

Did Reichard have a patent on that process?

stevieturbo

I had it done on a couple of pulleys ages ago. Didnt make one bit of difference.

speedtigger

iTrader: (16)

It will be in ntetesting to see how that affects belt life.

FastKat

iTrader: (10)

Thanks for bringing this up. I just searched and found the patent. I don't want to get into it here but I think what I am doing is substantially different.

Oddly, the Reichard patent talks about extending belt life. What I did here does not have those features.

I should know more accurate results this coming week!

bRAZENLS2gOAt

iTrader: (20)

subbing for the results

Blown06

iTrader: (32)

I can tell you this........I've used the Reichard pulley and it makes a hell of a difference and does not appear to wear the belt too bad. This mod works if done correctly.

stevieturbo

Do Reichard not also coat the pulleys or something though ? or leave some sort of rough finish that helps with grip ?

The Alchemist

iTrader: (19)

So help me out here, what's the deal with the Reichard pullies? I did a search and only find them for sale. I'd like to know more about them, like why they drill holes in them, is it to lighten them?

stevieturbo

The slots and holes are allegedly to prevent air getting trapped under the belt, which in turn can lead to reduced grip.

Which given the belt/pulley speeds involved, is plausible.

Reality ?? call Mythbusters

The Alchemist

iTrader: (19)

Interesting concept, and I've seen places where they say they offer a guarantee to add 1.5-2psi. If that's true, then it's worth the $150. But with Aster's bracket, I don't know how much belt slip I'm actually getting.

Blown06

iTrader: (32)

The thing about Reichard is that they never answer the phone and don't sell these on a consistent basis. I believe they have government contracts that keep them busy and $$$. From what I heard, he has no interest in doing these anymore. Hence the reason I'll never sell the one I've got. I assume most feel the same, that is why you hardly ever see them for sale. It took months to get mine direct from him back in 2009.

If you find one, ****** it up.

The Alchemist

iTrader: (19)

Thanks for the info.

FastKat

iTrader: (10)

UPDATE: After a street tune, the rip cut 2.38 pulley is now holding a peak 18.5 lbs with an overdrive crank pulley and Metco idlers, as logged with HPTuners. I think the overdrive crank pulley is a 10.5 or something like that.

Hopefully he'll have some dyno results later in the week.

It looks like I got the earlier data wrong. With the stock crank pulley: Before the rip cuts on the 2.38 pulley, the supercharger peaked at 14.2 and dropped to about 11 lbs. With the rip cuts on the 2.38 pulley, it peaks at 14.9 and holds it out much longer, eventually dropping to 12.9 lbs.

If it'll hold 18.5 lbs, I imagine holding 14 lbs without slip should be a breeze.

The Alchemist

iTrader: (19)

So who offers those rip cuts or do you have a DIY?