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Thread: '89 C1500 Turbo LQ4 goes 10.6@126

  1. #1

    '89 C1500 Turbo LQ4 goes 10.6@126

    Well guys, I'm more than happy with my first time out in the new setup!!! I love this current setup, only thing I want to change yet is my 3" down pipe, gonna go either 3.5" or 4", it's gotta be holding me back since my turbine exducer is 77.4mm. First pass was street setup with 4" air filter and going through full exhaust out to the bumper on 7-8 psi, I didn't 2step it very hard because it was my first pass and I didn't know how my 2 yr old 30x9 slicks would hook. DA was about 2300ft temps were around 55-60 degrees.

    My setup for those who dont know is:

    -03 LQ4 with 203k stock long block (bolts and all! just 216/220 .525 lift cam & LS9 springs)
    -CX Racing GT45 76mm home made turbo kit
    -4L80e w/TransGo shift kit
    -PTC custom spec'd 3000 10" converter
    -3.42 rear with Detoit Tru-Trac
    -4130 pounds with driver



    Then I took the filter off and opened my cut-out and turned it upto 12 psi and did this:



    It actually over boosted in third tho, to 15psi, but thats ok I had the tune setup to pull the timing to 10 degrees and go pig rich after 14 psi because I'm still on stock head bolts and gaskets LOL First gear never went over 11 psi and second was 12-13 psi. I gotta find a way to fix my boost creep!!! I was running high 10 AFR and 17 degrees to 13 PSI.

    Thanks goes out to my bro Jake (Jake99, who BTW also ran a 10.79@125.9 that night :headbang: http://www.performancetrucks.net/for...-night-515543/ ) for helping me with all the work of putting this thing together(I started this thing as a roller!!), Kyle @ KB Racing for helping me with getting some parts and some advice, and ESPECIALLY Dusty @ PTC for a kick ass torque converter!!!
    -John

    1989 RCSB 2WD Silverado w/6.0 & turbo swap in the works

    Turbo build:Click Here

    Previous 6.0 build thread:Click Here

  2. #2
    Join Date
    Apr 2011
    Location
    Texas
    Posts
    296
    nice runs dude
    2006 Silverado aka (Bad Bitch)
    K&N CAI, Diablo Predator, muffler delete, and a vette servo. 14.7x @ 93 mph (sold)

    1998 SS Camaro aka (Silver Bullet)
    LS6 intake, ported TB, LTs, ORY, cut out, and a pantie dropping tune by Nelson. 12.6 @ 110 mph 327 hp 347 tq

    2011 ecsb silverado aka (silver sleeper)
    forged 6.2 and a small snail

  3. #3
    Join Date
    Jan 2008
    Posts
    1,560
    badass man!! Ive been needing to hit the track and see how my cx racing 80mm gt45 does. It feels damn strong on 14 psi so Im hoping for similar times to yours but with a little more mph. That 60' was pretty good. Congrats!

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  4. #4
    Quote Originally Posted by o2camaross View Post
    badass man!! Ive been needing to hit the track and see how my cx racing 80mm gt45 does. It feels damn strong on 14 psi so Im hoping for similar times to yours but with a little more mph. That 60' was pretty good. Congrats!
    Thanks dude! Yeah I was hoping to be closer to 130 but literally when it hit 3rd and overboosted it felt like less power than when it was on 8 psi lol, I think if it had held 13 psi in 3rd i could have hit 128-129
    -John

    1989 RCSB 2WD Silverado w/6.0 & turbo swap in the works

    Turbo build:Click Here

    Previous 6.0 build thread:Click Here

  5. #5
    Join Date
    Jan 2012
    Location
    DFW, TEXAS
    Posts
    596
    im jealous, good runs. e85?

  6. #6
    Yup, e85
    -John

    1989 RCSB 2WD Silverado w/6.0 & turbo swap in the works

    Turbo build:Click Here

    Previous 6.0 build thread:Click Here

  7. #7
    Join Date
    Jan 2008
    Posts
    1,560
    Yea Im sure the way you had it setup when it overboosted it just went stupid rich and no timing. Once you throw 15psi its going to move out damn good!!

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  8. #8
    Join Date
    Jan 2008
    Posts
    8,203
    Badass times for sure

  9. #9
    Thanks guys. Here are some videos of me and my brothers trucks.

    My turbo 6.0 10.6@126.2mph - YouTube

    Jake99 turbo 4.8 10.7@125.9mph - YouTube


  10. #10
    Join Date
    Mar 2015
    Location
    Texas
    Posts
    5
    Dude i have a 93 im bout to put a lq4 in! Seeing this just made me happy joy joy hahaha

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