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Thread: 78 MPH in 2nd gear. Time incrementals 2500-7500 rpms on a factory cam

  1. #1
    Supporting Member Turbo Mopar Contributor Ondonti's Avatar
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    78 MPH in 2nd gear. Time incrementals 2500-7500 rpms on a factory cam

    I might post a video of this test I did.

    Factory internals 3.0 12 valve. 1992 Diamante cams, 1990+ pistons (smaller skirt). Cast crank. Factory Rods.
    8000 rpm limiter.
    Valve springs from a 3.3L Chrysler, because valves were floating on the Dyno.

    Fake "non turbo" setup.
    Wastegate spring defeated to achieve zero boost. Intercooler piping disconnected to prevent boost.

    2nd gear pull on 225/60r15 tires and a543 3.77 transmission.

    This is base on multiple Datalogs from the Fueltech. There is always noise in RPM and MPH signals so its a "mental average"
    Looking at this data like this, it would have been fun to record each gear.

    Time in seconds for 500 rpms. Speed in MPH
    3rd gear acceleration time for same MPH spread

    2500-3000 ____ .75 ___ 26-32 ___ 3rd gear time
    3000-3500 ____ .70 ___ 32-37 ___ .90
    3500-4000 ____ .63 ___ 37-43 ___ 1.00 3500 to 4000 rpms tanks 1.25 seconds in 3rd gear
    4000-4500 ____ .70 ___ 43-48 ___ 1.00
    4500-5000 ____ .70 ___ 48-53 ___ 1.00
    5000-5500 ____ .75 ___ 53-58 ___ .90
    5500-6000 ____ .88 ___ 58-63 ___ .90
    6000-6500 ___ 1.40 ___ 63-68 ___ 1.00
    6500-7000 ___ 1.75 ___ 68-73 ___ 1.00
    7000-7500 ___ 2.15 ___ 73-78 ___ 1.10


    I stopped at 7500 because the sound while accelerating slowly is scary.

    Power is dropping off, but also wind resistance and friction start hurting acceleration.

    You can see that just above 6000 rpms I should shift from 2nd to 3rd. That lines up well with the OEM manual transmission 6200 rpm limiter.
    Brent
    GREAT DEPRESSION RACING
    1992 Duster 3.0 The Junkyard - MS II, OEM 10:1
    - Old - 11.5@125 22psi $90 Stock 3.0 Junk Motor - 1 bar MAP
    1994 Spirit 3.0 - 12.3@113 15 psi - Daily Holset He351 -FT600
    - 393whp 457ft/lb @18psi

    1994 Spirit 3.0 a670 - Wife's - kids building a 3.0T
    1990 Lebaron Coupe 2.2 TI/II non IC, a413
    1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543
    1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag
    2005 Durango Hemi Limited -- 1998 Dodge 12v Cummins 47re 4x4 4dr longbed. No fuel plate. Mack plug, AFC & Spring mods. Boost elbow.

  2. #2
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: 78 MPH in 2nd gear. Time incrementals 2500-7500 rpms on a factory cam

    the joys of fast datalogging..... basically an on road dyno.

    https://barnhill.bitbucket.io/

    I saw this when i subscribed to jeff evans tuning academy for a month to get some insight on hondata kpro and megasquirt and some other systems.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

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