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los of acceleration on a hard pull.

This is a discussion on los of acceleration on a hard pull. within the Firebird / WS6 forums, part of the Vehicle Specific category; On a hard acceleration from 70 mph Tac gets above 5 grand and drop down to about 3 grand during ...

  1. #1
    Junior Member trnsman's Avatar
    Join Date
    Apr 2012
    East Hampton Connecticut

    2002 Pontiac transam

    los of acceleration on a hard pull.

    On a hard acceleration from 70 mph Tac gets above 5 grand and drop down to about 3 grand during which there is no acceleration, why?

  2. #2
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    Possibly your knock sensors are kicking in and the PCM is pulling timing... although that would have to be extreme. Other possibility is a fueling issue and it is running out of gas, which causes a lean condition... which is very bad.

  3. #3
    Junior Member RCH33's Avatar
    Join Date
    Jun 2015
    Greenwood, IN

    2002 Trans Am CE

    Just had a tune where the knock blocker would retard the timing 8 degs and then start bringing it in again. You can definitely see it on the Dyno chart. As Jeff says, fuel would do the same thing. Check the fuel,pressure readIng and see if it drops or not. See what your timing is at that load and rpm. You can retard timing a little and enrich the air/fuel at that point to keep it away from the knock block. A tuner can make the PCM add timing back a little faster than stock also. My tuner likes to keep everything right below the knock block to keep a good steady pull. I only lost 1hp and 1 ft/lbs of torque with a tune that keeps it out of knock block and feels much better. Probably better on the engine too.

    But, again as Jeff says: 5 grand to 3 is a big drop and seems like there might be something else. How fast does this take place and when do you start feeling the rpm's rise again.
    Last edited by RCH33; 08-28-2015 at 12:27 PM.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Ugy Lower Corner of AL

    Navy Blue Metallic
    98 T/A w/a little mods...

    any back fires? smoke in the exhaust?

  5. #5
    Veteran 0rion's Avatar
    Join Date
    Aug 2005

    98 Formula
    06 duramax

    need more info on specifics about what exactly the car does.
    Quote Originally Posted by Mean Green Z28 View Post
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  6. #6
    Member 1998 T/A's Avatar
    Join Date
    Aug 2008
    Huron Ohio

    2000 WS6 Trans AM

    I will bet you a thousand dollars it's a fuel pump
    98' Trans AM RIP

    00' WS6/Black/Pacesetter LT's/Magnaflow Exhaust/SLP lid/Nick Williams 92mm TB/FAST 92 Intake/BMR Strut Tower Brace/BMR Rear LCA's/BMR Panhard Bar

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