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Thread: 2017 Dyno results/upgrades

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  1. #1
    Join Date
    Aug 2005
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    Paoli Indiana
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    2017 Dyno results/upgrades

    Last year power was up a little from when Dave initially (279rwhp/12.70@107.7)tuned the car but still was not where i wanted it to be:




    This year i upgraded to the Magnum powers abradive rotor pack and went from 33% od to 25% od. Also discovered a crack in the MPX case and it had trashed the last set of rotors and beat up the inside of the case pretty bad so i replaced it with a fresh mpIII Boost was still low IMO 12/13psi which was the same i saw with GTP rotors and 33% od. The other day i discovered a large crack in the back of my raised top! I had taken this off a parts car and just threw it on when i put the 4.2 in two years ago. I threw a stock top back on and instantly went to 16psi! The car felt much better but the tune was lean above 2.9v vmaf. After some runs and adding fuel i had it back into the realm of being safe. Saturday i took the car to Blakenship tuning for their annual spring dyno day. Here are the results! Note: This is a mustang dyno not a Dynojet like what i had the car on at the shootout so gains are likely alot higher.



    Lee Blakenship told me that i am blowing through the converter pretty badly and highly recomended re-stalling it so i am going to try to do that this year. The stall speed is 3500+ now where it was originally meant to be 2800rpm! the converter was built for a very mild 3.8 and has always stalled higher with the 4.2 but now its kinda silly on stall speed. The car feels alot better than it ever did and i hope be in the lower 12s this year
    93 SC Red Auto 111k
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    4.2, 2.3 Whipple, 3.73s AOD
    307rwhp 12.70@107.2 (MPX)
    395rwhp Whipple.... et ?????

  2. #2
    Join Date
    May 2015
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    Where does the converter flash to now on the street? Was the converter locked? Nice gain from sorting out the issues.

  3. #3
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    Quote Originally Posted by 20psiofevil View Post
    Where does the converter flash to now on the street? Was the converter locked? Nice gain from sorting out the issues.

    I have a non locking setup and it flashes around 3500
    93 SC Red Auto 111k
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    4.2, 2.3 Whipple, 3.73s AOD
    307rwhp 12.70@107.2 (MPX)
    395rwhp Whipple.... et ?????

  4. #4
    Join Date
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    Location
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    Quote Originally Posted by Jacob_Royer View Post
    I have a non locking setup and it flashes around 3500
    Are you sure it isn't following the build trend and doesn't have cracks of it's own

  5. #5
    Join Date
    Apr 2002
    Location
    St. Charles, MO
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    20,886
    So what are the new numbers ? Dyno sheet is hard to read.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  6. #6
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    Paoli Indiana
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    QUOTE=David Neibert;1108792]So what are the new numbers ? Dyno sheet is hard to read.

    David[/QUOTE]
    93 SC Red Auto 111k
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    4.2, 2.3 Whipple, 3.73s AOD
    307rwhp 12.70@107.2 (MPX)
    395rwhp Whipple.... et ?????

  7. #7
    Join Date
    May 2015
    Posts
    68
    Quote Originally Posted by Jacob_Royer View Post
    I have a non locking setup and it flashes around 3500
    Jacob not trying to nit pick but how is 3500rpm flash stall blowing through the converter? If anything it seems a bit tight for the combo?

  8. #8
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    Quote Originally Posted by 20psiofevil View Post
    Jacob not trying to nit pick but how is 3500rpm flash stall blowing through the converter? If anything it seems a bit tight for the combo?
    Not at all its way too much stall for 3.73/wide ratio/m90
    93 SC Red Auto 111k
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    4.2, 2.3 Whipple, 3.73s AOD
    307rwhp 12.70@107.2 (MPX)
    395rwhp Whipple.... et ?????

  9. #9
    Join Date
    Sep 2004
    Location
    Indy
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    Not at all its way too much stall for 3.73/wide ratio/m90
    I entirely disagree with that. That thought's a plague that needs to go away from SC land so y'all can be faster.

    That's at least the stall you need to perform well. A different point/topic to make could be that there's too much total slip (not to be confused with stall speed) after the drivetrain speed catches up to the converter's drive speed. "Blowing through a converter" means that the stator can't hold the forces being applied by the converter pump, i.e. making too much HP for the design of the converter. If you're stopping at 3500 that means that your new power level was higher than originally intended, but that's one way to 'loosen' up a converter is an increase in power. Just as long as you don't have a lot of high speed slip.
    1994 SC
    4.5L Twin Turbo SVO
    Project GTFD

  10. #10
    Join Date
    May 2015
    Posts
    68
    Quote Originally Posted by Jacob_Royer View Post
    Not at all its way too much stall for 3.73/wide ratio/m90
    A 373 gear ratio will actually soften the hit on the converter. The lower numerical gear ratio makes the converter work harder. My flash stall increased from 5200 to 5400 rpm just by switching from a 26" to 28" tire. Turbocharged though so load plays a bigger role on my boost curve.

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