i am about to get the alta 2.0 15% pulley installed and was wondering what belt you are running with it...napa or goodyear....any problems with belts and this pulley?

 

stock belt here.. no problems at all

 

See my thoughts here: https://www.northamericanmotoring.co...33&postcount=3

Rest of the thread is a decent read.

- Matt

 

I have the M7 16% with the stock belt. No problems at all.

 

hey astro, does your M7 pulley have the tiny little "vent" holes around the lip as they show? ("active cooling system") I got mine the other day and its totally flat (no extra venting)
I'm sure it doesnt make much difference, but I liked the idea of them.

 

I run a NAPA 060535 on my V2 15%. After initial stretch it has exactly one full hole on the belt tensioner, same as stock config.

The NAPA 060539 was slipping, you could see the little dips in torque on the chassis dyno plot. Also after initial stretch there was barely any hole visible, clearly too long for this pulley.

 

ya go with the 535/stock size belt...

 

Stock is great! The other good choice is the OEM JCW belt. Both excellent choices!

 

According to the Alta Chart,
If you just install Alta pulley, they recommended either use stock or NAPA Belt #060539

If u upgraded the stock crank pulley, check out the alta pulley in their website, there is one section called chart. Take a look at it ..

 

dont go with the 539 belt....its too long for just the pulley...535 or stock size... if nothing else talk to Waylen he is the one who installed mine!

 

The 539 belt slipped like mad on my 15% pulley over 5000 RPM. The 535 doesn't slip that I can tell...I'd need a dyno to tell for sure...I have one full hole on the tensioner.

 

I don't understand why Alta continues to have that flawed chart up. It's very misleading...following their suggestions, you most likely will end up with belt slip, leading to possibly a glazed belt and lower boost.

- Matt

 

Hi Matt,

This is the first I have heard of a flaw. My apologies if you are anyone else had a problem. We have used the chart for many years as well as followed it on our own personal cars. What exactly is the flaw so we can fix it or at least address it?

Thank you for the help to me and the community!

 

Hmmm interesting.

That is equally interesting.

It might just come down to that everyone should just get the 535 belt, and let'r stretch. But this is all new news to us. We have put on lots of 15% pulleys with 539, and lots of OEM belts. Never had we had a problem. HEY!! We are here to make things better so if we need to adjust the chart, no problem.

 

I'm replacing belt for my Version 2.0 15% pulley tomorrow.My mechanic has a Bando brand belt with a number ending in ...535 on the packaging.

Is this the manufacturer of Napa's belts?different?same product?
Anyone had experience?

I had this same belt installed in May of last year.I put on 10000 blast filled miles.

Worn too quickly??

 

does anyone know the part number for the gatorback thats the same as the 535?

 

I found it in a thread once upon a time...
try "gatorback Belt"

 

I had a Gatorback and I believe that its failure led to my €650/$964 repair bill!! Dunno why/how a new belt on a new V2 pulley install would shred 288km/179miles after installation, having cruised for 2 1/2 hours on the Autobahn, but it did and here's my post about the whole drama.

Not only will I replace with a NAPA belt (as soon as I find one shipping to APOs), I will be installing this safety strap from Detroit Tuned. Once bitten, twice shy. Caveat emptor.

Cheers!!

 

Figuring the belt #'s is pretty easy with the serp belts. The last three digits are the total belt length, i.e. 535 = 53.5 inches, and the 060 is the number of ribs, i.e. 060 = 6 ribs. Goodyear Gatorback and Napa use the same numbering convention (as do other aftermarket brands), so just look for the same numbers.

 

Wow, sorry about the late response on my part.

The possible flaw is the belt sizes are too large. See my post in this thread above referencing this link (https://www.northamericanmotoring.co...3&postcount=3), or the remainder of the posts in that thread in general.

The 539 may be good, I go with the 535 personally...but the stock belt on a 15% is MUCH too large, as will the JCW be I believe (I don't know the stock dimensions of the JCW belt, only that the JCW pulley is 11%...a belt designed for that reduction can't be good when running more).

- Matt

 

According to the alta website, 15% use the stock belt, isnt it ?

 

Sure...but re-read post number 14

 

As mentioned in post 14 above from Jeff there may be a reason to change the chart. The concern we have is many people have had great success with both options. I continue to stand by the JCW OEM and MCS OEM belts for a 15%.

But, the DT tensioner strap is a GREAT idea REGARDLESS of belt and pulley choice. (I shouldnt say this as the ALTA Crank Pulley sells better as a result of damaged tensioners.) But we want people to be happy with the money they have spent as well as being stuck on the freeway is a complete nightmare!

Thanks again! Let me or Jeff know if we can help further!