FORCED INDUCTION Turbos | Superchargers | Intercoolers | H2O/Meth Injection
Sponsored by:
Sponsored by:

Magnuson SC on 2014+ Sierra

Old 03-05-2019, 09:39 PM
  #1  
Staging Lane
Thread Starter
 
Join Date: Oct 2017
Location: Southern CA
Posts: 64
Received 6 Likes on 6 Posts
Default Magnuson SC on 2014+ Sierra

If anyone has a 2014+ Sierra/Silverado 6.2L with a Magnuson supercharger, please read on to see if you can help me out.

I have a 2017 Sierra 6.2L with a Magnuson TVS1900. It came with an 84mm pulley, but only made 4psi of boost instead of the 6psi it was supposed to make. It also had a little bit of ping (not sure why, could be the bad CA 91 octane gas). Upon learning the boost was low and sending in an HPT data log, Magnuson immediately sent me a 78mm pulley. The boost was then right at 6psi (same amount of trace ping).

Out of curiosity, I installed a 2.8 inch (71.12mm) GripTec pulleyI had to see if the boost would go up and if the ping would increase. The drive belt was slipping off of the idler pulley pretty bad, so I took the pulley off without even driving it. This was with the Gates Century Series Micro-V K060938 6PK2385 (94.5 inches) belt that came with the supercharger.

Questions:
1) Does anyone with this same setup get 6psi of boost with the 84mm pulley?
2) If you get 6psi with the 84mm, what might have happened to prevent me from getting that boost?
3) What length belt are you running with your setup?
Mileguru is offline  
Old 03-06-2019, 08:06 AM
  #2  
TECH Junkie
iTrader: (5)
 
MikeGyver's Avatar
 
Join Date: Jun 2005
Location: Northern Illlinois
Posts: 3,726
Received 42 Likes on 32 Posts
Default

You don't have a signature listing your mods, is the engine completely stock other than the supercharger?
MikeGyver is offline  
Old 03-06-2019, 10:02 AM
  #3  
Teching In
 
Matt24's Avatar
 
Join Date: Sep 2017
Location: Flint MI
Posts: 16
Received 3 Likes on 2 Posts
Default

Search your belt number on this page and find one just a little smaller. Just remove the RPM from the end of the number to get a normal belt or add HD for a green belt.

https://assets.gates.com/content/dam...t-newbrand.pdf

Last edited by Matt24; 03-06-2019 at 10:11 AM.
Matt24 is offline  
Old 03-06-2019, 10:18 AM
  #4  
Staging Lane
Thread Starter
 
Join Date: Oct 2017
Location: Southern CA
Posts: 64
Received 6 Likes on 6 Posts
Default

Originally Posted by Matt24 View Post
Search your belt number on this page and find one just a little smaller. Just remove the RPM from the end of the number to get a normal belt or add HD for a green belt.

https://assets.gates.com/content/dam...t-newbrand.pdf
Thanks. I'm in the process of doing just that.
Mileguru is offline  
Old 03-06-2019, 10:19 AM
  #5  
Staging Lane
Thread Starter
 
Join Date: Oct 2017
Location: Southern CA
Posts: 64
Received 6 Likes on 6 Posts
Default

Originally Posted by MikeGyver View Post
You don't have a signature listing your mods, is the engine completely stock other than the supercharger?
Just an Elite Engineering E2X catch can at the beginning. I tested it with and without the catch can and nothing changed. I've since added an Alky Control system to stabilize the detonation at heavy throttle.
Mileguru is offline  
Old 03-06-2019, 12:20 PM
  #6  
TECH Addict
iTrader: (19)
 
terravast4's Avatar
 
Join Date: Jul 2007
Location: Austin, TX
Posts: 2,305
Likes: 0
Received 32 Likes on 31 Posts
Default

You should also tune for a pulley change. You are probably lucky that belt was slipping off.
terravast4 is offline  
Old 03-06-2019, 12:59 PM
  #7  
Staging Lane
Thread Starter
 
Join Date: Oct 2017
Location: Southern CA
Posts: 64
Received 6 Likes on 6 Posts
Default

Originally Posted by terravast4 View Post
You should also tune for a pulley change. You are probably lucky that belt was slipping off.
For sure. I already have a tentative 2.8inch pulley tune for when I get a smaller belt.
But to stay on topic, I want to know if anyone else has a 1900 Maggie on a 2014+ 6.2L making 6psi on an 84mm pulley.
Mileguru is offline  
Old 03-06-2019, 08:15 PM
  #8  
TECH Senior Member
iTrader: (16)
 
smokeshow's Avatar
 
Join Date: Feb 2009
Location: Detroit
Posts: 7,304
Likes: 0
Received 33 Likes on 31 Posts
Default

Stock LSA pulley, around 75mm...makes between 6-7psi at 900ft elevation. Stock LS3 and LSA blower.
smokeshow is offline  
Old 03-06-2019, 09:44 PM
  #9  
TECH Regular
iTrader: (4)
 
qwank's Avatar
 
Join Date: Aug 2003
Location: Hudson, NH
Posts: 427
Received 1 Like on 1 Post
Default

Like I mentioned in my thread, I'm using the 83m pulley on the SLP TCS1900 and making 9.5 PSI on average. The two other guys I know with the kit are running around the same, no less than 8.5 though.

I think I would first check to make sure your bypass valve is closing all the way
qwank is offline  
Old 03-06-2019, 09:58 PM
  #10  
Staging Lane
Thread Starter
 
Join Date: Oct 2017
Location: Southern CA
Posts: 64
Received 6 Likes on 6 Posts
Default

Originally Posted by qwank View Post
Like I mentioned in my thread, I'm using the 83m pulley on the SLP TCS1900 and making 9.5 PSI on average. The two other guys I know with the kit are running around the same, no less than 8.5 though.

I think I would first check to make sure your bypass valve is closing all the way
You're the reason I starting thinking about this and wrote the thread =)
I'll look into the bypass valve, thanks!
Mileguru is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
MagnusonSuperchargers
Sponsor's Announcements, Sales, and Specials
7
12-12-2013 05:43 AM


Thread Tools
Search this Thread
Quick Reply: Magnuson SC on 2014+ Sierra


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: