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Thread: Buick 350 Holley HP EFI Initial Tune

  1. #1

    Default Buick 350 Holley HP EFI Initial Tune

    Hello. I have a Buick 350 that I have setup with a Holley HP EFI kit. I'm using a cam sensor from a Buick 3.8L turbo engine (1x) and I'm using a 36-1 crank trigger wheel from a Ford Escort with a Holley Hall-Effect crank sensor. I have 8 Holley smart coils and 8 66 lb/hr holley injectors. I have just rebuilt this small block Buick and it's first start was with the Holley EFI system. I couldn't believe it fired up the second key turn, as I'm totally new to user programmable EFI and expected much more of a struggle to get the engine started.

    I have tried to do as much research as possible before posting here, but it's nice to be able to get some more specific answers to my questions to make sure I'm on the right track.

    It seems I'm fighting against a strong lean tendency off idle and while at idle I have a repeating lean spike showing. I just figured out tonight how to get the system into Closed Loop and Learn at idle, but once I go off idle it comes out of Learn mode. I can't drive the car just yet, but I would like to make sure that my EFI system is installed correctly and that my issues are software related, before continuing to get my car roadworthy. I have downloaded several datalogs, but it's hard for me to really relate them to what my problem could be. I'm leaning (no pun intended) towards a vacuum leak. I would like to make sure that my IAC is setup correctly, and not causing my lean condition.

    I also would like to know if there is an easier way to map out the Base Timing Table. The base calibration of 25° timing at idle & 34° WOT seems like way too much timing. My previous ignition system was about 14° initial timing and all in 34° at 3000 RPM, and with vacuum advance I had 42°. I'd really like to learn how to tune this car correctly to prepare for next year when the car is forced induction.

  2. #2
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    Quote Originally Posted by Smallblockbuick350TT View Post
    I just figured out tonight how to get the system into Closed Loop and Learn at idle, but once I go off idle it comes out of Learn mode.
    Closed Loop & Learning isn't active during periods of acceleration enrichment or deceleration (zero TPS, 400 RPM above target idle).
    The engine needs to be at "steady-state" RPM for the Learning to function, at lower RPM.
    The Closed Loop Status has many momentary periods when it's inactive (Open Loop mode).
    This is normal due to the TPS & MAP based acceleration enrichment (transient fueling).
    Also, any "noise" on the TPS or MAP signal wire (false Rate of Change) will deactivate Closed Loop.
    http://documents.holley.com/techlibr...__statuses.pdf (Sensor Diagnostics & Statuses)
    http://forums.holley.com/showthread....7370#post47370 (Learn Table - Read this thread, especially posts #2, #6 & #11.)

    I would like to make sure that my IAC is setup correctly, and not causing my lean condition.
    http://forums.holley.com/showthread....neral-IAC-Info (General IAC Information - Read "IAC NOTES")

    The base calibration of 25° timing at idle & 34° WOT seems like way too much timing.
    The Base Timing Table is fully user programmable. Enter the values you want.
    In the EFI software, click "Help", "Contents" & "Step-By-Step Beginners Tuning".
    Look at Figure 11: "Example of Fuel Map with Graphical Representation".
    That illustration should explain how the ECU uses the Base Fuel & Timing Tables.
    You can verify this by watching where the live cursor moves to when Online with ECU.
    http://forums.holley.com/showthread....ents-Read-This! (Initial Checks & Adjustments - Read This!)
    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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