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12 sec n/a DOHC Fiero, is it possible?

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  • #46
    As has been said, Northstar pistons won't work without other custom parts because of pin diameter and compression height. They're cast anyway. If you want to use it hard, you want forged pistons.
    Current:
    \'87 Fiero GT: 12.86@106 - too dam many valves; ran 12.94 @ 112 on new engine, then broke a CV joint
    \'88 Fiero Formula: slow and attention getting; LZ8 followed by LLT power forthcoming
    \'88 BMW 325iX: The penultimate driving machine awaiting a heart transplant

    Gone, mostly forgotten:
    \'90 Pontiac 6000 SE AWD: slow but invisible

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    • #47
      my isuzu does grind like its an olympic sport. mostly it seems like the clutch isnt disingaging corectly. like if i start thr car, leave it in nuetral, then try to shift into reverse, its grinding the entire time. id run one on a 2.8, but like you said not on a big torque motor. but then, not every isuzu built is identcal. im sure some joe has one that holds up and worships it like some people do the duke motor.
      If you aren't friends with a liar, you aren't friends with anyone.

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      • #48
        so mumaro, have any idea's on which powerplant you are going to go for yet?
        The Official Rotating Mass Nazi

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        • #49
          Originally posted by Doubt_Incarnate
          my isuzu does grind like its an olympic sport. mostly it seems like the clutch isnt disingaging corectly. like if i start thr car, leave it in nuetral, then try to shift into reverse, its grinding the entire time.
          Don't blame the transmission for a crappy clutch. A lot of Fiero guys say the Isuzu shifts smoother than the Getrag.

          Marty
          '99 Z-28 - Weekend Driver
          '98 Dodge Neon - Winter Beater
          '84 X-11 - Time and Money Pit
          '88 Fiero Formula - Bone stock for now

          Quote of the week:
          Originally posted by Aaron
          This is why I don't build crappy headers. I'm not sure, I don't know too much about welding.

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          • #50
            Also, since there's NO SYNCHRONIZER on reverse, grinding into reverse doesn't indicate a transmission problem...
            Current:
            \'87 Fiero GT: 12.86@106 - too dam many valves; ran 12.94 @ 112 on new engine, then broke a CV joint
            \'88 Fiero Formula: slow and attention getting; LZ8 followed by LLT power forthcoming
            \'88 BMW 325iX: The penultimate driving machine awaiting a heart transplant

            Gone, mostly forgotten:
            \'90 Pontiac 6000 SE AWD: slow but invisible

            Comment


            • #51
              it was a good tranny for a while. just doesnt shift so good now, usually catches somethign else. one reason i swapped to it was the 4spd popped out of 2nd all the time, really cool. in the end the isuzu did its job, and i'll still play with it but it needs redone. it to devolped a pop out of second disease, i used to hold the shifter out of paranoia. like my car is cursed to pop out of second all the time. or something.

              swap in a SBC, they are everywhere. with a carb there is no wiring crap. the coolest swap i saw was a guy did up a 383 TPI stroker, and used the fwd tranny from an old eldorado. sat longitudanaly in the back. not much of a trunk and i forget what else had to be done to wedge it in there, but it looked cool.
              If you aren't friends with a liar, you aren't friends with anyone.

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              • #52
                There are a couple with a SBC in front

                I would not suggest a SBC swap. By the time they are done, they end up costing a lot more. Plus the added tq stresses the tranny a lot. Also, handling is messed with, it throws off the weight balance and you have to cut the frame in a couple parts for it to fit.

                But, there is nothing like a cammed V8 at idle, and even with a stock LT1 it'll run in the low 13s, if not high 12s.

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                • #53
                  that reminds me. of a fiero that dropped my jaw it is what first got me curious about the car in the 1st place. a guy used a tornado tranny with a 455. after begging for a few minutes i got him to crank it(i was 15 at the time) it looked like the engine sat still and the rest of the car cammed
                  The Official Rotating Mass Nazi

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                  • #54
                    i wonder what you can't fit in a fiero...
                    If you aren't friends with a liar, you aren't friends with anyone.

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                    • #55


                      Olds 455 in a Fiero-look familiar?

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                      • #56
                        first time I've seen it, looks thoroughly badass

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                        • #57
                          kind of but the other guy had a larger intake with 2 carbs, the trunk was cut out and it was a pontiac 455. I wonder what it ran??

                          i don't know if any peeps are from VA but the guy's name was dave and he ran a fiero junkyard in louisa, VA.
                          The Official Rotating Mass Nazi

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                          • #58
                            This guy has given up on the dohc swap. I called it.

                            Thank you.

                            See you all in a week.

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                            • #59
                              Yeah now he is selling his 2 fieros....

                              ...buying a 500 dollar 4 door cutlass thing and swapping in a 38SC...

                              ...or he is fixing up his Talon...

                              ...or whatever happens next week.
                              1984 Indy Fiero 3.4L
                              13.7 sec @ 98 mph
                              *ALL THROTTLE AND NO BOTTLE*

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                              • #60
                                Originally posted by donk_316
                                ...or whatever happens next week.
                                HAHAHAHAHAHA!!!!!!!

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