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F.A.S.T. Injectors??

This is a discussion on F.A.S.T. Injectors?? within the Internal Engine forums, part of the LSx Technical Help Section category; I'm in the process of building my cammed '98 (TSP 228R). Basically started with a bare block and rotating assembly ...

  1. #1
    Bird Rehab Center ThunderChicken's Avatar
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    Navy Blue Metallic
    1998 Trans Am

    F.A.S.T. Injectors??

    I'm in the process of building my cammed '98 (TSP 228R). Basically started with a bare block and rotating assembly with pistons. We've cleaned that up and I've got new bearings in, and the cam is ready to be dropped in.

    Upgrades already there:
    Moly pushrods
    LS7 lifters
    TSP upgraded factory roller rockers
    Mahle aluminum flat-top pistons
    Heads are factory 241s
    LS6 intake

    Anyway, I'm now looking at what injectors I should put in and was wondering what your experiences are with F.A.S.T, or to see if you guys had other suggestions. This will be a daily driver, too, so I can't really go TOO nuts with the rest of the build. Suggestions??

    I'm also in need of ignition for the same car and not sure what to go with there... any help is appreciated!

    1983 T/A 305 4BBL...SOLD!
    1988 GTA 305 TPI/M5 (Emma)
    1995 Firebird 3.4 V6 (Ellie)
    2001 Firebird 3800 V6 (Missy)
    1998 NBM T/A...LS1/M6 coming soon (Lacey)
    1992 Chevy C2500 HD...(the tow rig)

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    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    I've heard good things about both FAST and Siemens injectors.

    When researching injectors for my FI built, most of the builders I talked to used Siemens, but FAST were also popular.

    Have you calculated what size you need?

  3. #3
    Bird Rehab Center ThunderChicken's Avatar
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    Navy Blue Metallic
    1998 Trans Am

    Quote Originally Posted by 35th-ANV-SS View Post
    I've heard good things about both FAST and Siemens injectors.

    When researching injectors for my FI built, most of the builders I talked to used Siemens, but FAST were also popular.

    Have you calculated what size you need?
    According to TSP, 36 lb. injectors are good up to 512 hp, and I have more than stock, but not that much.

  4. #4
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    2008 Hummer H3

    Fast injectors seem to be popular, as well as the least expensive it seemed on egay. iirc
    Been considering 42.5's myself actually.. I don't know anything about the siemen injectors..

  5. #5
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    Once i do throw in heads i might be going with the Fast injectors as well.

  6. #6
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    I run FAST 50 lb. injectors...didn't need that big now, but tuner said he could tune them fine with my current mods, plus I wouldn't have to upgrade down the road, so far no issues.

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    You should be finewith the 98s stock injectors. Thy were rated at 28.5#s. I didn't have to go to bigger injectors until I changed to a FAST intake.
    TSP 347 SB, TSP Stage 2.5 PRC LS6, TSP MS4, Performabuilt Stage 2 4L60E, Yank PT4000, 4.11s, Fast 90/90, FTRA Cold air intake+all the free mods, Dynatech Supermaxx Exaust System, DMH Cutouts, Hooker Catback/FTRA Tips. Tuned by RPM/Garner NC. 11.28@119

  8. #8
    Bird Rehab Center ThunderChicken's Avatar
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    I scored a set of practically-new stock injectors for $50 from someone on Facebook. SCORE!!

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