Drivetrain 15% pulley, best belt?
#26
I had just over 20K on a stock belt with a 15% and it was stretched out about 1" longer than a new stock belt.
Therefore, I would suggest using a shorter belt. Like others have said, if the JCW pulley has a shorter belt, then it makes that a 15% should also run a shorter belt.
I used Gatorback part 060537 (1365mm vs stock 1388 vs jcw 1374)
Therefore, I would suggest using a shorter belt. Like others have said, if the JCW pulley has a shorter belt, then it makes that a 15% should also run a shorter belt.
I used Gatorback part 060537 (1365mm vs stock 1388 vs jcw 1374)
#27
I had just over 20K on a stock belt with a 15% and it was stretched out about 1" longer than a new stock belt.
Therefore, I would suggest using a shorter belt. Like others have said, if the JCW pulley has a shorter belt, then it makes that a 15% should also run a shorter belt.
I used Gatorback part 060537 (1365mm vs stock 1388 vs jcw 1374)
Therefore, I would suggest using a shorter belt. Like others have said, if the JCW pulley has a shorter belt, then it makes that a 15% should also run a shorter belt.
I used Gatorback part 060537 (1365mm vs stock 1388 vs jcw 1374)
The 060537 Gatorback belt works real well with no slipping.
#28
#32
That is THE belt NAPA sells. I was looking on the little cardboard sleeve that comes with the belt and it actually says manufactured by Gates.
So if people are looking for that particular belt all they need to do is hit up a local NAPA shop.
So if people are looking for that particular belt all they need to do is hit up a local NAPA shop.
#34
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I just completed installing an Alta 1.0 15% pulley on a 2004 MCS...Alta sent me a NAPA 060547 (supposedly same as stock). After the install everything was fine (no squeal or any other issues) until I pushed it hard over 4500 rpm's, then I was getting a lot of squeal. I drove it for a few miles hoping it would "break-in" but it didn't stop. I then read all the posts telling me that the pulley was probably misaligned, but I wanted to exhaust all other options before doing the whole job again to torque the bolts...
In the Alta install instructions is has the following (in table form, with a lot more data):
stock SC + no other changes: NAPA 060547
15% SC pulley (also 17%) + no other updates: NAPA 060539
So I looked at the belt tensioner and saw that it was maxed out (no holes showing and down to the tee) with the 060547 belt installed. So I went to NAPA and got the 060539, installed it thru the right fender in an hour and...problem fixed! No more squeal...thru redline....and wahoo, this is nice!
In the Alta install instructions is has the following (in table form, with a lot more data):
stock SC + no other changes: NAPA 060547
15% SC pulley (also 17%) + no other updates: NAPA 060539
So I looked at the belt tensioner and saw that it was maxed out (no holes showing and down to the tee) with the 060547 belt installed. So I went to NAPA and got the 060539, installed it thru the right fender in an hour and...problem fixed! No more squeal...thru redline....and wahoo, this is nice!
#35
#36
#37
#38
Every who is "running the stock belt with 15% with no issues" merely doesn't know that they are having issues. Even my 17,000 mile stock belt was slipping with the Alta V2 pulley. I had no symptoms and thought it was great - woohoo pulley! Then I replaced the belt with the 060539 belt and it was like doing the pulley all over again - I didn't know the pulley was slipping. Another forum member here gained 30 dyno-proven-hp by changing belts because his stock belt was slipping and he didn't know it.
The 060539 belt works pretty good and will stretch to just about the right length. The 060535 belt is a tight fit but provides the most belt tension (which is crucial for power transmission via non-cogged belts).
The 060539 belt works pretty good and will stretch to just about the right length. The 060535 belt is a tight fit but provides the most belt tension (which is crucial for power transmission via non-cogged belts).
#39
#41
The supercharger belt slipping manifests itself as a boost spike. If you had a boost gauge and saw spikes about 15psi it could be a sign that the belt was slipping. Of course a boost spike could also indicate other issues.
#42
It should be noted that a "boost spike" due to a slipping belt would only approach the maximum boost level of a non-slipping belt... so compared to a properly functioning car, one would be more concerned with dips in the torque curve. There is no physical way that a slipping belt can spin the supercharger faster than a gripping belt. "Boost Spike" in this case is therefore somewhat misleading and may cause people to expect a higher-than-normal boost situation with a slipping belt, which is impossible.
#43
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