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3.9L LZ9 87 IROC-Z28 - GT4088 turbo

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  • #31
    Racing in May...
    11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
    10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

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    • #32
      Originally posted by Mars View Post
      Racing in May...
      10's?
      "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

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      • #33
        it's 1/8 mile so... 7's.
        11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
        10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

        Comment


        • #34
          Got some pics of my goodies for the rear end.



          Spohn Weld on LCARB's.
          3.45 rear end 9 bolt.



          TA perf. cover
          ARP carrier bearing studs
          MSF racing BW78 series rear drag spool
          JEGS extended wheelstuds

          I just have to drop everything off to some reputable shop and get all the bearings changed and the backlash set. Not doing it myself as the last time I set up a rear end it lasted 100 miles.

          Should have more pics of the rest of the car soon, work is coming along, still shooting for May racing, worst case June.
          11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
          10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

          Comment


          • #35


            Was testing out the 2 step...

            results : the brakes hold to at least 3200 RPM (likely hold more, I didn't try) and it builds 141 kpa there (6-7 psi) on the brakes. Then once the brakes are realeased it just lays rubber and goes all over all of the lanes. HAHA.

            I'm hoping for MUCH better 60' times this year, last year I got to 6-7 psi about 2 car lengths out...

            Overall the tune is VERY VERY good. I can drive this car anywhere, it's soo nice now.

            Code59 tune. Only done about 3 autotunes, but they are always helping.

            I have to admit I am a little scared of the car. it is f.a.s.t. now for a street machine.
            11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
            10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

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            • #36
              I demand videos! :P
              Past Builds;
              1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
              1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
              Current Project;
              1972 Nova 12.73@105.7 MPH

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              • #37
                Ran a 7.20 @ 101 peddling it at 15 psi. Traction was an issue.

                Should run 6.99 on a better day. Not sure if there are videos or not, going to race 1/8 mile this weekend again.
                11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
                10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

                Comment


                • #38
                  any updates? Video?
                  "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

                  Comment


                  • #39
                    went a bit quikcer with a couple 7.1's at 107MPH.

                    I'll get vids for next week.
                    11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
                    10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

                    Comment


                    • #40
                      here is a low quality vid. ran 7.1

                      http://www.youtube.com/watch?v=FlpfGKfJIC8
                      11.92 @ 122 MPH 3400 91 Cavalier Z24 Intercooled S/C. -totalled-
                      10.56 @ 130 MPH 3900 LZ9 87 IROC Z28 Intercooled GT4088 Turbo

                      Comment


                      • #41
                        Nice! And low quality? I was expecting 240p not 1080p hd lol
                        sigpic
                        ----------
                        BUILT Turbo 3400/4t65e-HD powered Grand AM in the making.

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                        • #42
                          hey Mars; just wondered if there was an update;
                          just got an 06 3900 'crate' motor in the garage and thinking about largely doing what you have done - in my fiero.
                          A long-term reliability report on the stock internal engine would be pretty interesting....
                          thx!
                          GP
                          Niagara Falls area

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                          • #43
                            Yes there was an update, he may have lost track of this thread. Updates in this thread....

                            V6 - 3900 IROC-Z28 buildup. - 352660 Decided to replace the old 3500V6 with a 3.9L LZ9 engine. ran a best of 11.13 with the 3.5, hoping this motor will run quicker. Basically an internally stock LZ9 : 60# Mini Siemens injectors Proform elec. waterpump TCE timing cover / thermostat outlet TCE external crank trigger WOT...
                            '86 Grand National

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                            • #44
                              thanks man; that is awesome.. he figures over 100 runs now. And all he did internally was WOT cam and springs...???

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                              • #45
                                TCE bearing spacers of course as well.
                                '89 Firebird, 3500 Turbo, T56, 9-bolt/4.11
                                '86 Fiero, 3500, 4-speed

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