Thread: volumetric efficiency of N/A, SC, TC, and twincharged L67

Results 1 to 20 of 27

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1 Re: volumetric efficiency of N/A, SC, TC, and twincharged L67 
    GrandPrix Junkie SgtMarshal's Avatar
    Join Date
    Feb 2012
    Location
    Kemmerer, Wyoming
    Posts
    4,704
    Thanks (Received)
    10
    Likes (Received)
    25
    Dislikes (Received)
    0
    Quote Originally Posted by Turbocharged400sbc View Post
    a twin charged car is a crutch for too large of a turbo that spools slowly due to lack of exhaust volume. the SC helps grunt up the bottom end but then becomes a drag up top as it falls off in pumping efficiency as the turbo reaches its.

    not a problem nowadays with VNT turbines allowing for the best of both worlds with a turdbo.
    that's what I was trying to say last night, but I couldn't see past the red, and all that really came out was that the supercharger helps with low and mid power, but when the turbo starts taking over, the supercharger gets in the way. I suggested a clutch should be used to disengage the supercharger when the turbo took over, but the cost of a clutch is going to be excessive.
    Reply With Quote  
     

  2. #2 Re: volumetric efficiency of N/A, SC, TC, and twincharged L67 
    GXP Level Member coolone's Avatar
    Join Date
    Nov 2011
    Location
    NY
    Posts
    2,374
    Thanks (Received)
    0
    Likes (Received)
    3
    Dislikes (Received)
    0
    Quote Originally Posted by SgtMarshal View Post
    I suggested a clutch should be used to disengage the supercharger when the turbo took over, but the cost of a clutch is going to be excessive.
    I've seen that in a movie once (mad max), lol...

    but really, I'm not aware of a clutch driver pulley system being installed on a SC functionally, correct me if I'm wrong! But I don't think there would be a clutch that small that could handle the load, or a rotor shaft that could handle the strain. The clutch even if it would grab, wouldn't last too long, let alone with smaller pulleys where RPM's are crazy, heat is crazier. That's why there's the bypass valve... Just my $.02 lol
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
    Reply With Quote  
     

  3. #3 Re: volumetric efficiency of N/A, SC, TC, and twincharged L67 
    GrandPrix Junkie SgtMarshal's Avatar
    Join Date
    Feb 2012
    Location
    Kemmerer, Wyoming
    Posts
    4,704
    Thanks (Received)
    10
    Likes (Received)
    25
    Dislikes (Received)
    0
    Quote Originally Posted by coolone View Post
    I've seen that in a movie once (mad max), lol...

    but really, I'm not aware of a clutch driver pulley system being installed on a SC functionally, correct me if I'm wrong! But I don't think there would be a clutch that small that could handle the load, or a rotor shaft that could handle the strain. The clutch even if it would grab, wouldn't last too long, let alone with smaller pulleys where RPM's are crazy, heat is crazier. That's why there's the bypass valve... Just my $.02 lol
    If I remember correctly, Mercedes-Benz had a twin charged 4 cylinder that used an electric clutch
    Reply With Quote  
     

Similar Threads

  1. different cam for the twincharged GTX
    By danomite02 in forum Turbo
    Replies: 20
    Last Post: 01-14-2014, 08:20 AM
  2. Volumetric Efficiency of A Roots Blower Purdue University Study
    By hdnseek in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 0
    Last Post: 12-11-2013, 12:15 PM
  3. Porting Your Gen 3 for better efficiency
    By OrangeL67 in forum How To Write-Ups/Tech Tips
    Replies: 8
    Last Post: 07-15-2011, 12:22 AM
  4. Tranny mods for efficiency? (MPG)
    By JoeMama in forum 1997-2007 4 speed Automatic (4T65E) (4T65E-HD)
    Replies: 7
    Last Post: 06-22-2008, 09:27 AM
  5. Tuning for fuel efficiency...
    By Sabrewings in forum PCM Tuning
    Replies: 11
    Last Post: 05-31-2008, 11:59 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •