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    Results 1 to 4 of 4
    1. #1
      Join Date
      Mar 2013
      Location
      Sunny Calif
      Posts
      220
      Country Flag: United States

      LQ9 408 forged need Supercharger advice

      Guys saw this post of sand car engine build with dyno run and I am building similar set up for street application.

      "408 LQ9 / GM 1.9 LSA Dyno to tune on 91, 11:1 engine
      First pull stock ctsv lower crank pulley and the upper 2.55 it made 3 or 5lbs of boost not impressive.
      Change the lower out and underdrive it by 7%.
      With the 2.55 and the 8-7/8 lower it made 660rwhp at 6400 rpm / 675rwtq at 3800 rpm at max boost of 9.8lbs on the Dyno at 3800 rpm.
      LSA turned 23k rpm at 6400 engine rpm. Recommended max rpm for LSA supercharger is 25k rpm and they go boom around 27k I believe."

      Difference is 9.5 compression in my street application, question is will OEM 1.9 GM LSA run out of volume with 408 and 9.5 compression?
      I don't want to spin it to the moon either, strictly street / fwy application. I live in Cali and actually drive my car in 100+ deg weather and want as little heat as feasible which means spinning blower slower but keeping volume to feed stroker.

      Would this combo be better off with more expensive 2650 OR full ported GM 1.9 (joker/boost district sells for 3800 bucks) the difference is about 2,900 dlls more for Kong 2650 priced at 6,500.
      Goal: is similar 660rwhp at 6400 rpm / 675rwtq at 3800 rpm at max boost of 9.8lbs but realistically id be fine with 650hp/600tq in the specified RPM range if it translates into the DD Pump gas friendly LS3 manners I had with last 453 rwhp / 412rwtq ls3.

      Using as cast LS3 ported heads with 5 angel valve job and btr lsa stg 2 cam.

    2. #2
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,480
      Country Flag: United States
      Why not the Magnuson Heartbeat 2300? I really like those systems.

      Andrew
      1970 GTO Version 2.0
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    3. #3
      Join Date
      Mar 2013
      Location
      Sunny Calif
      Posts
      220
      Country Flag: United States
      i thought the Maggie 2300 would run out of volume on a 408 lq9, no?
      If not the case the Heartbeat 2300 works for me, may even fit under stock hood.
      I see its priced at 6k so poses the question if going to spend that much why not 2650 priced the same, more air les rotor spin, less heat, unless Heartbeat is just that efficient to carry 408 with equal or less compressed heat.

    4. #4
      Join Date
      Jun 2001
      Location
      Los Angeles
      Posts
      5,718
      Country Flag: United States
      Though the 2650 is a great supercharger, it is big and tall. You may want to see if there are dim's available from Magnuson to see if it will fit. The Kong 2650 may be a lower profile option but fitment should be confirmed.

      VaporWorx. We Give You Gas http://www.vaporworx.com