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Thread: 502-9 TBI Concerns

  1. #1
    sharkdad Guest

    Cool 502-9 TBI Concerns

    I am considering purchasing a 509-2 TBI to replace the stock unit on my 92 Chevy K1500 with 5.7 motor. Everything under the hood is completely stock.

    I have read a few blogs indicating a need to tweak the settings in the ECM in order to get the Holley TBI to actually improve performance. Some of these posts I read are pretty old, so I'm looking some current truth on this.

    My main interest in the 502-9 is the statement that it is a "direct bolt-on replacement" for the stock unit. If that is not the case, I would really like to know what I'm getting into.

    Any inputs would be greatly appreciated.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    22,702

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    It's advertised as a direct OEM replacement.
    Does yours look exactly like the one pictured?
    The instructions don't mention any ECU tuning.

    Do you want to "improve performance" or a "direct bolt-on replacement"?
    You mentioned both these goals in your post. ECU tuning increases power.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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