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  1. #1
    Fuel Injected!
    Join Date
    Jul 2013
    Age
    34
    Posts
    98

    My twin supercharged tbi 350 miata build

    let me catch everyone up on this.

    over the past 2 years, i had been swapping a chevy 350 into a mazda miata [funds held me back, but eventually i got it done]..... caught fire in the process but it didn't stop me. i blew the engine up at the racetrack, rebuilt it, and now were are back in action with a different chassis.

    SO, after slight research and talking with Dave W; i am going to be building a twin eaton m90 [thunderbird supercoupe superchargers] tbi chevy 350. The plans are to port them and if calculated correctly; should run about 18PSI. i will be running a single 2in-1out intercooler, a methonal/water injection system when the car hits boost, and e85 to TRY to prevent detonation on a 10:1 engine. chevy 350's are a dime a dozen at my pic-a-part....... so, if it blows, just gonna keep trying until we get it straightened out.

    ill be running a 454 throttle body with 454 injectors, i am also running a twin belt setup..... v-belt for crank, waterpump, and power steering; then a 5-rib belt found on early vans for the alternator, waterpump, crank, and both superchargers...... i have 2 timing belt idlers from my miata that i am using for the non-ribbed side as idlers to get the belt to go where i want, then im using a tensioner somehow to obviously put tension on the belt. the superchargers have 8 rib pulleys, but the 5 rib belt fits right over them no probelm.

    the engine itself is a GMPP crate 350/285-300hp...... i slapped vortec heads on during the rebuild and the shortblock is the exact same as the GMPP crate 350/330hp, so theoretically it should be the GMPP crate 350/330hp now. It's an 880 block with 4 bolt main and 1 piece RMS. The car already blows off the tires through 4th gear, but still, power is power :D time to grab some slicks lol.

    The trans is a bone stock WC t5 from a v6-fbody. it's held up so far, no issues...... stock 10.5in clutch.

    rear end is a stock miata 4.10 [7inch ring gear]...... it will be upgraded to a 2.8 thunderbird IRS rear with factory five racing axles, however, im going to have to relocate my lower shock mount for the axles to fit.

    custom driveshaft.
    custom TBI wiring.... re-worked my harness on here awhile back
    PCM - 16196395 - pretty sure dave and i talked about this computer being capable of boost...... can someone please clarify?

    there is a LONG road ahead, but it will all be worth it. I am shooting for 450whp.

    this is my car after 2 years













    but i needed to get something safer, so i am building a different chassis with a roll cage; just in case.

    in the meantime. enjoy
    https://www.youtube.com/watch?v=4ZvIvqdXKoI

    https://www.youtube.com/watch?v=XDSE2km69F8






    I started building and eventually finished the trans tunnel...... don't hate on the flux core welder haha. It does the job, just ALOT of cleanup.















    I also tac welded plates in the driver compartment on the firewall to patch the wholes that I won't be using.





    far from perfect, but far from bad too. think im done with the underside..... i know there's imperfections but its good enough for now.... i can always give it some love later on.

    Last edited by Shawn1989; 02-23-2015 at 07:14 AM.

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