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My APS 402ci twinturbo build..pics

This is a discussion on My APS 402ci twinturbo build..pics within the Forced Induction forums, part of the LSx Technical Help Section category; Those are pretty big valves for stock heads....

  1. #161
    Still The Junior Member RedVertTA's Avatar
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    Red+White Top and Stripes
    2000TransAmConvertible A4

    Those are pretty big valves for stock heads.
    FAST 90/90, SLP Lid, Kooks JetHot Coated LT's, American Racing Y-Pipe+Magnaflow Cats, DHM Electric Cutout, Flowmaster American Thunder Catback, HP Tuners Software, 343 rwhp.

    BMR Convertible Subframe Connectors, Hotchkis Strut Tower Brace, BMR Driveshaft Safety Loop.

  2. #162
    Blown and Stroked TNTramair's Avatar
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    2000 trans am ws.6

    Quote Originally Posted by 99TAWS6 View Post
    Way to go APS twin brother.! That is some great numbers for 9 psi and your combo give me hope that mine should make some decent numbers when dyno it next spring hopefully.
    I imagine it feels like a pretty wicked beast at even 9psi. I am fairly impressed with mine even with no boost on the built 408 and haven't even gone past 50% throttle yet.

    what fuel system do you have again tnt?

    I am going dana 60 think with 3.54 gears. Then 4l80e swap with think yank py 3400e stall. That stuff will finish my build pretty much.

    Should have maybe just disconnected the inlet ducts on the dyno and tried to see what it could do at 15psi or so. Bet that would hit the 800 rwhp range on auto and maybe 850 on m6. Thats what I am thinking. Shouldn't need 18psi on the 402 or 408 engines to hit that. Assuming a persons clutch or auto is holding the power.




    .
    thank you. im running a Dual Racetronix intank pump with new AN hoses (forget the size) for feed and return....60# injectors as well but i may have to go bigger if i ever decide to increase power as they are at about 90%right now.
    as far as rears...im lookin into Midwest Chassis for hi fab 9"...for the price and what you get, it cant be beat.

  3. #163
    Blown and Stroked TNTramair's Avatar
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    2000 trans am ws.6

    Quote Originally Posted by RedVertTA View Post
    Those are pretty big valves for stock heads.
    yeah...compared to an aftermarket head like AFR these heads were suprisingly close in airflow also so i figured id give them a try. i figured the added cost of an additional $1200-$1500 for a set of aftermarket heads wouldnt benefit me at all. $ to HP ratio, it wouldnt be worth it. worse case scenerio, if these didnt work out id get some TFR's or AFR's and resell these probably for the same amount i paid for them. but, so far, so good!

  4. #164
    Still The Junior Member RedVertTA's Avatar
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    May I ask how much you payed for them?

  5. #165
    Blown and Stroked TNTramair's Avatar
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    2000 trans am ws.6

    $800.00

  6. #166
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    RED
    1999 TRANS AM WS6

    Are you running a boost referenced regulator.If you aren't the 60s will be used up much quicker they can take a lot more fuel pressure. How is idle with those. Not sure if will stick with the bigger 79 high impendence that are now offered or go to low imepedence and get some 96s or something. Wonder how big would be needed for e85 but we don't have it here yet anyway maybe next year or two.

  7. #167
    Blown and Stroked TNTramair's Avatar
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    2000 trans am ws.6

    Quote Originally Posted by 99TAWS6 View Post
    Are you running a boost referenced regulator.If you aren't the 60s will be used up much quicker they can take a lot more fuel pressure. How is idle with those. Not sure if will stick with the bigger 79 high impendence that are now offered or go to low imepedence and get some 96s or something. Wonder how big would be needed for e85 but we don't have it here yet anyway maybe next year or two.
    running a areomotive fuel pressure regulater and a Hobbs switch for the fuel pumps.

  8. #168
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    RED
    1999 TRANS AM WS6

    Why not take up the base pressure a bit more than..

  9. #169
    Blown and Stroked TNTramair's Avatar
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    2000 trans am ws.6

    well, its workin ok the way it is now so i dont wanna mess with it. when and if the time comes to raise the boost i may have to redo some things anyway and if pressure becomes and issue, ill address it at that time.

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