belt screech? - MustangForums.com

Notices
4.6L V8 Technical Discussions Any questions about engine, transmission, or gearing can be asked here!

belt screech?

Reply

 
 
 
Old 01-16-2013, 11:47 PM
  #1  
crishdavis
Thread Starter
 
Join Date: Jan 2013
Location: Illinois
Posts: 14
Default belt screech?

So I have subs in my s197 and they roasted the alternator. I bought a bigger one off am (can't remember the amps) and installed it. Now when I'm wide open and it shifts it sounds like a belt slips or screeches for a split second. Any ideas on what that could be or how to fix it?
crishdavis is offline  
Reply With Quote
Old 01-17-2013, 06:22 PM
  #2  
Nuke
6th Gear Member
 
Nuke's Avatar
 
Join Date: Jun 2007
Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
Posts: 16,186
Default

Does it do it while you're pissing off everyone within a mile radius (i.e, does it happen only with the amps crankin') or all the time? If it's the latter, then I'd say the belt tension isn't correct. Matter of fact, it probably isn't correct either way...
Nuke is offline  
Reply With Quote
Old 01-18-2013, 09:02 AM
  #3  
crishdavis
Thread Starter
 
Join Date: Jan 2013
Location: Illinois
Posts: 14
Default

Ya I can only hear it when I'm not bumpin haha. How do you change belt tension?
crishdavis is offline  
Reply With Quote
Old 01-18-2013, 10:42 AM
  #4  
moosestang
6th Gear Member
 
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
Default

You can't adjust belt tension. Replace the belt, it's probably stretched.
moosestang is offline  
Reply With Quote
Old 01-18-2013, 07:15 PM
  #5  
Nuke
6th Gear Member
 
Nuke's Avatar
 
Join Date: Jun 2007
Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
Posts: 16,186
Default

Originally Posted by moosestang View Post
You can't adjust belt tension...
I wasn't sure about that. Thanks, moosestang.
Nuke is offline  
Reply With Quote
Old 01-18-2013, 08:15 PM
  #6  
moosestang
6th Gear Member
 
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
Default

Originally Posted by Nuke View Post
I wasn't sure about that. Thanks, moosestang.
No problem. If he had a positive displacement supercharger, then he could adjust it. I believe they all have some sort of sliding idler pulley.

he could replace one of his stock idler pulleys with a larger one, but this might give you too much tensioner. I have a 90mm in place of my 70mm on my tensioner and a 100mm in place of one of the 90mm's.
moosestang is offline  
Reply With Quote
Old 01-18-2013, 09:25 PM
  #7  
danzcool
4th Gear Member
 
danzcool's Avatar
 
Join Date: Oct 2008
Location: CA
Posts: 1,931
Default

Also, could go with the "frankentensioner" mod which will double the tension, also some of the slipage may be coming from tensioner arm flex in which case an aftermarket tensioner like the thump racing one could help out... but start with a new belt, they are cheap.
danzcool is offline  
Reply With Quote
Old 01-19-2013, 10:00 AM
  #8  
crishdavis
Thread Starter
 
Join Date: Jan 2013
Location: Illinois
Posts: 14
Default

Sounds good, I'll try throwing a new belt on and see what happens!
crishdavis is offline  
Reply With Quote
Old 01-29-2013, 01:23 AM
  #9  
Justinsmt88
2nd Gear Member
 
Join Date: May 2012
Location: Ohio
Posts: 315
Default

My screeches after going through a car wash or while driving in the rain. Lol
Justinsmt88 is offline  
Reply With Quote
Old 01-29-2013, 01:49 AM
  #10  
07BLACKGT
5th Gear Member
 
Join Date: Nov 2006
Location: Alabama
Posts: 2,935
Default

FWIW mine also does this on hard shifts using the PA Performance Alternator.
07BLACKGT is offline  
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: belt screech?


Advertising
Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.