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  • Fiero Engines

    I recently finished off the Suspension & Brake upgrades. Now i'm looking into replacing or upgrading the V6. I've narrowed it down to.

    Stock V6
    1. Rebuild bottom end & Stroke to 3.1 - 160hp
    2. Design One Stage II turbo - 250hp

    Quad 4
    1. High Output Engine - 180hp
    2. ACE Turbo - 325hp

    3800
    1. Series II Engine - 210hp
    2. ACE Stage II Supercharger - 284hp
    3. ACE Intercooler - 300hp

    Northstar
    1. 4.6 engine - 300hp


    Do any of you guys have one of these setups?

  • #2
    Re: Fiero Engines

    How come a 3.4L DOHC isn't on that List!!!

    215 Base HP, tuneable to 300+ HP. Mine benches out at 325 at the crank. The most beautiful part is the REVS!!! If you want THE motor to replicate the performance and sound of a 355, the 3.4L DOHC is it!

    Anything else is just a motor swap, the 3.4L DOHC is a GLOVE!

    DKOV -

    PS... I havn't mentioned it to you all yet, but I've decided to add a Turbo! 400+ is now the goal!!!

    Comment


    • #3
      Re: Fiero Engines

      I know, I know...that was my first choice, but the engine was discontinued 4 years ago. I dont want to run into trouble down the road.

      Plus I cant find anyone who can tune it out or produce a turbo for it anymore. IRM, PISA, ACE & Design One dont sell one. Hook me up......

      Do you think a 3.4 DOHC can be rebuilt with forged & billet parts, ported & overbored, plus a turbo installed for $8000? Including Engine.

      The northstar setup is about $9500. The Quad 4 & 3.8 setups are about $6500. (including engine & labor)

      How much did your engine cost after rebuild? Are you using the Getag 284 tranny?

      Comment


      • #4
        Re: Fiero Engines

        Well... Forged and Billet? Most of the darn thing is already aluminum

        It can easily be built up for $8000 or less. I don't have nearly that much into mine. The new addition, the Turbo, is not from any "kit" buillder but a specific design for this motor that is compiled of parts that any Joe can buy himself for around $1000.

        Oh, yes, I'm using a Getrag 384 5-speed tranny. It was the tranny mated to the motor from the factory.

        My motor is port, polished, balanced, etc. The only thing left that I had not done was add a Turbo, and well...

        The new GM replacement is a 3.5L DOHC and is in reality, HALF a Northstar. They are virtually identical in most every other respect. It's a great fit too.

        The big (and significant) issue that most people overlook with the hunt for more HP and swapping out those N* motors and small blocks and such... The WEIGHT.

        The Fiero is already MUCH to bias to the rear with basically a 40/60 weight problem. Balance is key to a great performer and the Fiero is pretty UN-balanced. Adding a V8 only compounds the problem. That is the biggest reason I went with the 3.4L DOHC is that with a minor change, I can bring the balance to nearly 50/50.

        Plus, truth be told, no motor sounds quite like it

        Put whatever you want in there, I was just curious why you didn't have it listed.

        DKOV -

        Comment


        • #5
          Re: Fiero Engines

          Isn't there a problem with the Northstar engines (3.5,4.0 & 4.6) mating to stick, what kind of fun in 300 horses with no dam stick?

          How much torgue is that motor of yours putting out? Is it pushing the Getag to its limits. I think the recommended max for the Getag 284 is about 250 & 200 for the 282.

          As for the 50/50 weight, the Quad is obviously much lighter and so is the Northstar. The Northstar is also all alluminum.

          So you didn't rebuild any part of the bottom end? Last thing I need is a rod flying out the block at the track ;D


          Supercharged 3800
          I dont like this engine mostly because it is butt ugly and heavier that the stock v6

          Turbo Stock V6
          For the same amount of money I would have to pour into this thing, I could get more HP elsewhere.

          Northstar
          Pretty engine...all alluminum...lighter than v6...But must be babied when in stick form. NO THANK YOU, NEXT!

          Turbo High Output Quad 4
          I really love this engine. Low torgue...Lighter that the V6...high reving. However, I would have to rebuild the bottom end with stronger parts. 185hp to 325hp is a huge jump from simply adding a turbo.

          As for the DOHC, that was my first choice. You saw my messages asking about it elsewhere. I guess I'll keep looking.
          I have heard that it has the meanest sound out of the bunch.

          Comment


          • #6
            Re: Fiero Engines

            Don't forget to check your state smog first if you're also unfortunate enough to live in a state that has it. Here in CA, the only swap that will pass smog with my 2.8 and 4 speed is the 3.4 pushrod. Theb3.8 SC won't even pass the visual part of the smog with a 4 speed.

            Comment


            • #7
              Re: Fiero Engines

              California is tought, I've heard. I didn't realize that they knew enough about the visuals to kick you out just by looking at one! That's tough, Man!

              I just went through DEQ with my 3.4L TDC stuffed in my Fiero. Interestingsly, I do NOT have a CAT on my car :

              I was sweating it when the inspector walked around and asked my to pop the deck! Standing behind the decklid, I could not see what was going on but after around 15 seconds, I was told to wait for the test to begin and have a nice day!

              Car passed with flying colors! There's a margin to pass within and I wasn't even above HAVLF of that margin! With NO CAT!!!

              My muffler guy told me to tell them, if they asked, that the CAT was on the manifold in front. Of course, they'd have to pull the motor to verify that!

              Still, I was very happy it passed VERY well.

              DKOV -

              Comment


              • #8
                Re: Fiero Engines

                Check out this site with regards to a caddy 4.9 swap. I have drove one and talk about nice. http://www.thefierofactory.com/cad.htm

                FieroDon@cfl.rr.com
                www.fiero.us
                FieroDon@cfl.rr.com<br />www.Fiero.us<br />FieroDon<br />86 SE<br />87 GT (factory blue)<br />88 GT<br /> [IMG]http://home.cfl.rr.com/donsfieros/images/SIG.JPG[/IMG]

                Comment


                • #9
                  Re: Fiero Engines

                  Unique, I'm don't know how much mechanically inclined you are, (no insult) but it takes a bit of skill to do what you are
                  talking about. We can compare engines all day. "Hey, I can just slap a turbo on a HO quad-4 for an easy 325HP!". Not that easy, and PLEASE, someone show me a dyno test of a 325HP quad-4. I'd love to see it.
                  "That engine is pretty". Uh... ok. I wouldn't base thousands of dollars on it looking pretty. Northstar must be babied in stick form??? Talk to people who have done it, I am sure they will tell you that you are mistaken.
                  Ok, let me overview what your question was. Which engine do I want? I've narrowed it down to "60 degree v6's, quad-4, northstar, or 3800" (so basically any GM engine that has been stuffed into a fiero, minus SBC and 3.4TDC... but probably not the 3800SC because it's "butt ugly"...)

                  Comment


                  • #10
                    Re: Fiero Engines

                    Oh yeah, forgot one important detail.

                    .. and the 3.4 OHV isn't a legal swap in California either, as said by GM performance parts:

                    http://www.paceparts.com/product.asp?0=239&1=240&3=503

                    Comment


                    • #11
                      Re: Fiero Engines

                      ya left out the 2nd best engine Gm built !

                      Comment


                      • #12
                        Re: Fiero Engines

                        the fiero will take several engine combinations an it depends on what you want gas mileage or super horse power 8)
                        In the USA if you pay a company / person to start a plug, then it,s your plug and work ,it is not theirs to sell or trade !!

                        Comment


                        • #13
                          Re: Fiero Engines

                          Don't forget to think about the SOUND of the engine when you are all done. You really want a V-8 AT LEAST!!
                          And the joke is,<br />when he awoke his,<br />body was covered in Coke fizz !

                          Comment


                          • #14
                            Re: Fiero Engines

                            Go with the 4.9L caddy...plenty of torque and mates perfectly with the Fiero tranny....Plus use the caddy cradle for wider track and caddy brake setup. Very easy swap and very minor engine re-wiring needed.

                            Good luck - VK
                            Life is too short to be driving Hondas!

                            Comment


                            • #15
                              Re: Fiero Engines

                              more horsepower is great but when you sacrifice weight an ill handling ,it will not perform like a sports car , if you want smooth reactions in a fiero use a light weight engine that produce 250-300 HP  an is all aluminum this way the car is balanced, did Ferrari put a iron block engine  in the back, NO because they would have had ill handling too , if you are looking for engine choices remember if a aluminum engine can weigh less that the 2.5 liter iron duke ( aluminum engines are out their some weigh 150 -170 less than the iron duke 4 cyl. with double the horsepower  ) personally i want a aluminum 250 hp engine an decent gas milage ,i do not need 600hp an 175 pounds of extra weigh out back an for all the guys that run the 3800SC tell the form how your handling is ,so they read an trust your VIEWS

                              Unique you have the right idea on engines above , BALANCE or as the spec sheet say , weight distibution 44/56 ( just a example ) all engineers shot for 50/50 ( perfect balance ) but we must remember they can only use what they are given
                              In the USA if you pay a company / person to start a plug, then it,s your plug and work ,it is not theirs to sell or trade !!

                              Comment

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