• Welcome to SVTPerformance!

2015 Vorech looking for 10psi pulley

Discussion in '5.0L Coyote V8 Engine Modification/Discussion' started by dmp0001, Dec 11, 2017.

  1. dmp0001

    dmp0001 New Member

    Messages:
    8
    Joined:
    Dec 7, 2017
    Location:
    Colorado Springs
    I have a 2015 GT with the Vortech full kit. I live at about 6000ft altitude and I am currently getting 7.1psi at 7000rpm according to my factory boost gauge. I would like to see between 9 and 10psi. Do I need the 3.48" or 3.33" pulley? Thanks for anyone that can help! Pics for attention: IMG_0505.jpg FullSizeR vortech.jpg
     
  2. PC03GT

    PC03GT Well-Known Member Established Member

    Messages:
    1,320
    Joined:
    Sep 8, 2010
    Location:
    delaware
    Do you still have the cats on it? I'm seeing 11psi with the stock 3.6 and headers
     
  3. dmp0001

    dmp0001 New Member

    Messages:
    8
    Joined:
    Dec 7, 2017
    Location:
    Colorado Springs
    I have Pypes Long tube catted headers, full 3" exhaust a high flow intake and a 90mm TB. I'm not sure how mods affect my psi because I had them on before I added boost. I think it's the altitude killing me (6000ft). But I am right at Vortech's claim of 7.5-8.5psi. I am also keeping my redline at 7,000, I know people see more at higher rpm. My real question is which pulley will net me about 2psi. It seems no one really knows for sure so I guess I'll try the 3.48 and see what I get.
     
  4. PC03GT

    PC03GT Well-Known Member Established Member

    Messages:
    1,320
    Joined:
    Sep 8, 2010
    Location:
    delaware
    I would say that's your only choice. I used to run a 3.8 and was making between 8 to 9, then put the stock 3.6 on and picked up 2 psi
     
  5. dmp0001

    dmp0001 New Member

    Messages:
    8
    Joined:
    Dec 7, 2017
    Location:
    Colorado Springs
    Are you running vortech or Paxton? Sounds like you have a paxton. 3.8 is stock paxton and 3.6 is stock vortech both are 7.5-8.5psi at factory redline.
     
  6. PC03GT

    PC03GT Well-Known Member Established Member

    Messages:
    1,320
    Joined:
    Sep 8, 2010
    Location:
    delaware
    I have a vortech, I changed the pulley because I was running out of fuel, shitty ass 47s and a bap. Once I got my id1000s on I put the 3.6 back on
     
    dmp0001 likes this.
  7. dmp0001

    dmp0001 New Member

    Messages:
    8
    Joined:
    Dec 7, 2017
    Location:
    Colorado Springs
    Update: I moved to the 3.48 pulley and am at 8.6 psi at 7,000rpm. A gain of 1.5psi from the 3.6 pulley. So I think the 3.4 pulley is probably where I want to end up...
     
  8. christian01

    christian01 Member Established Member

    Messages:
    49
    Joined:
    Jun 5, 2015
    Location:
    Pennsylvania
    I don’t think the factory boost gauge is accurate my friend. 2-3 psi off is pretty much the normal. You’d be best getting an aftermarket gauge before you put any more boost to it


    Sent from my iPhone using Tapatalk
     
  9. dmp0001

    dmp0001 New Member

    Messages:
    8
    Joined:
    Dec 7, 2017
    Location:
    Colorado Springs
    I ran the 3.6 pulley on the dyno and my gauge was low by about 0.1psi, so pretty close. after I get my tune dialed in I will run it again and see how off it is.
     
  10. chadder1313

    chadder1313 Member Established Member

    Messages:
    163
    Joined:
    Oct 2, 2012
    Location:
    Inwood WV
    Im at 6000 feet and i run the 3.33 on my v3. I see 10ish at 7k.
     
  11. dmp0001

    dmp0001 New Member

    Messages:
    8
    Joined:
    Dec 7, 2017
    Location:
    Colorado Springs
    Thanks, I will try that one next!
     

Share This Page