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Thread: Circle D Specialties or Precision Industries?

  1. #1
    Join Date
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    Northern California
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    Circle D Specialties or Precision Industries?

    Which torque converter do you recommend? And why?

  2. #2
    Join Date
    Nov 2013
    Location
    CT, MA
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    Quote Originally Posted by Lowndex View Post
    Which torque converter do you recommend? And why?
    either, because they are the top 2 brands for our cars.
    sent from my rotary phone using Technicolor


    2004 SILVER BIRCH/BLACK PAINT
    DARK CHARCOAL NUDO LEATHER
    #400 of 997 (SOLD)

    2004 CV LX SPORT
    ALL BLACK, 6 DISC, TUNED MZT (SOLD)

    2004 300A MM BLACK
    1 OWNER CAR, NO OPTIONS
    DAILY DRIVER

    2013 DAYTONA R/T
    SUPER TRACK PACK
    DAYTONA BLUE PEARL
    #1763 off ~2100
    NOW WITH A 392 & 3.73 posi!

  3. #3
    Join Date
    Nov 2002
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    St. John, IN
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    No comparison between the 2. Circle D all the way

  4. #4
    Join Date
    Feb 2003
    Location
    Earth
    Posts
    8,598
    Blog Entries
    2
    I have had a PI for 160,000 miles and 280+ run down the 1/4. So far so good.
    1/4 Mile Time 11.542 @ 121.19 MPH
    195,000 Miles & 275+ Runs Down the 1,320’
    541.57 RWHP & 476.64 RWTQ on DynoJet
    Tuned by Aric at Injected Engineering
    Vortech Super Charger V-2 “T” Trim, 19 PSI
    8 Rib Belt, Innovators West 10% Overdrive Dampner
    Air to Air Intercooler, Mini-race Bypass
    Ford Cobra Remanufactured Long Block
    Snow Performance Water-Methanol Injection
    Kooks Headers & X Pipe
    GT MAF, 60lb injectors, Dash 8, Aero Rails, Twin Ford GT Pumps,
    Kinsler Fuel Filter, Kenne Bell Boost-A-Pump
    Monroe Sensatrac, Metco Control Arms, Addco Rear Sway Bar
    31 Ford Spline Axles & Detroit Truetrac, 4:10 Ford Racing Gears
    Dynotech MMC Driveshaft
    A-1 Performance Trans, Forced Tailshaft Lube, Carbon Clutches
    3,500 RPM Stall Precision Industries Torque Converter
    B&M Deep Finned Trans Pan
    AeroForce Scan Gauges , Auto Meter Oil, Fuel & Boost Gauges
    Kenny Brown Dead Pedal, 35% Tint, Silver Star Head Lights
    AutoPage Alarm RS-727LCD, Boston Acoustic NX87

  5. #5
    Join Date
    Nov 2013
    Location
    CT, MA
    Age
    61
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    3,399
    1 for 1 so far.....
    sent from my rotary phone using Technicolor


    2004 SILVER BIRCH/BLACK PAINT
    DARK CHARCOAL NUDO LEATHER
    #400 of 997 (SOLD)

    2004 CV LX SPORT
    ALL BLACK, 6 DISC, TUNED MZT (SOLD)

    2004 300A MM BLACK
    1 OWNER CAR, NO OPTIONS
    DAILY DRIVER

    2013 DAYTONA R/T
    SUPER TRACK PACK
    DAYTONA BLUE PEARL
    #1763 off ~2100
    NOW WITH A 392 & 3.73 posi!

  6. #6
    Join Date
    Jan 2004
    Location
    Somewhere in the N.C. Triangle
    Age
    68
    Posts
    26,250
    I've had my PI for 60+k, numerous dyno pulls, 1/4 & 1/8 runs, still going strong.

    I actually picked it up at their factory and got a nice tour to boot!
    “When you can’t make them see the light, make them feel the heat.”
    Ronald Regan

    "The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

    Lt. Colonel Ralph Peters

    “Be polite, be professional, but have a plan to kill everybody you meet.”
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




  7. #7
    Join Date
    Oct 2010
    Location
    4 miles from insanity and 2ft from broke!
    Posts
    9,559
    Circle D , is far superior to precision, as mentioned there is truly no comparison between the two, Circle D is the best.
    04 MERCURY MARAUDER build date:02/11/04
    ITS ALIVE !!!!!!!!

    STAY TUNED!!!!!!!!!!

    **WHIPPLE 4.0L CRUSHER!**0000 (FOR NOW) RWHP

    VISIT MY GARAGE FOR A FULL LIST OF MODS

  8. #8
    Join Date
    Sep 2006
    Location
    Psych ward
    Age
    53
    Posts
    1,081
    Circle "D" allthe way, my bro switched out from percision to Circle "D" everything about the trans seem to perfrom better......stall speed, driveability......
    Or it could have been the tuner himself ...either way he switchd up and hasn't looked back.
    • 82 GT coyote swap started
    • 03 300a Marauder, stroked,cammed,T/S Trilogy Supercharged # 216,Best Et 10.77@129.72 on slicks, 93 pump gas. driven to the track.
    • 2011 GT 500, 3.4 whipple,93 pump gas,10.47@133,Driven to the track.
    • 2003 azura blue Mach 1, cobra motor,2.9 Whipple,crusher inlet,built 4r70w trans,04 IRS rear.full weight street car, Corn Fed

  9. #9
    Join Date
    Nov 2007
    Location
    San Jose
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    Quote Originally Posted by Lowndex View Post
    Which torque converter do you recommend? And why?
    Just a note of caution as to being somewhat conservative with the stall speed. High stall converters can be notoriously irritating to drive depending on how "loose" they are and how high the stall speed.

    With a supercharged engine you won't lack for power. Just something to think about and discuss with the converter manufacturer and engine builder. A tenth or two at the dragstrip might not make up for the annoyance factor of a slippery converter.
    Lifespeed

    2004 Silver Birch Marauder 130K miles
    Wilwood Aero6 F, NMDP R brakes, Penske 7500DA shocks, Hypercoil 600lbs F and Grand Marquis R air springs, Addco tubular sway bars, Metco control & Watts, 31 sp axles, Stainless Works cat-back exhaust, Lidio tune, American Racing AR883 9.3" 50mm F 10" 59mm R 20" wheels, Pirelli P-Zero 265/35-20, 275/40-20 tires

    Coming soon: Livernois 5.0L stroker, ADTR/Vortech V2 intercooled SC, Silverfox trans and Circle D converter

  10. #10
    Join Date
    Feb 2003
    Location
    Earth
    Posts
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    2
    Quote Originally Posted by lifespeed View Post
    Just a note of caution as to being somewhat conservative with the stall speed. High stall converters can be notoriously irritating to drive depending on how "loose" they are and how high the stall speed.

    With a supercharged engine you won't lack for power. Just something to think about and discuss with the converter manufacturer and engine builder. A tenth or two at the dragstrip might not make up for the annoyance factor of a slippery converter.
    I have had a 3,500 stall for over 140,000 miles. It's all in the tune. Computers in the right minds are amazing things.
    1/4 Mile Time 11.542 @ 121.19 MPH
    195,000 Miles & 275+ Runs Down the 1,320’
    541.57 RWHP & 476.64 RWTQ on DynoJet
    Tuned by Aric at Injected Engineering
    Vortech Super Charger V-2 “T” Trim, 19 PSI
    8 Rib Belt, Innovators West 10% Overdrive Dampner
    Air to Air Intercooler, Mini-race Bypass
    Ford Cobra Remanufactured Long Block
    Snow Performance Water-Methanol Injection
    Kooks Headers & X Pipe
    GT MAF, 60lb injectors, Dash 8, Aero Rails, Twin Ford GT Pumps,
    Kinsler Fuel Filter, Kenne Bell Boost-A-Pump
    Monroe Sensatrac, Metco Control Arms, Addco Rear Sway Bar
    31 Ford Spline Axles & Detroit Truetrac, 4:10 Ford Racing Gears
    Dynotech MMC Driveshaft
    A-1 Performance Trans, Forced Tailshaft Lube, Carbon Clutches
    3,500 RPM Stall Precision Industries Torque Converter
    B&M Deep Finned Trans Pan
    AeroForce Scan Gauges , Auto Meter Oil, Fuel & Boost Gauges
    Kenny Brown Dead Pedal, 35% Tint, Silver Star Head Lights
    AutoPage Alarm RS-727LCD, Boston Acoustic NX87

  11. #11
    Join Date
    Jan 2004
    Location
    Somewhere in the N.C. Triangle
    Age
    68
    Posts
    26,250
    Call the guys at PI and they'll recommend a stall & converter based on your mods and driving style.
    “When you can’t make them see the light, make them feel the heat.”
    Ronald Regan

    "The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

    Lt. Colonel Ralph Peters

    “Be polite, be professional, but have a plan to kill everybody you meet.”
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




  12. #12
    Quote Originally Posted by sailsmen View Post
    I have had a 3,500 stall for over 140,000 miles. It's all in the tune. Computers in the right minds are amazing things.
    Man you are kidding about all in the tune. I went from wanting to sell my car after my PI 3500 was installed and DR sent me an "updated tune" for it to loving it after Zack got the tuning squared away.

    2004 Silver Birch
    300B
    Build date:9/29/2003, Adopted on 12/02/05
    Exhaust by Greg
    13.630 @ 100.49 mph (11/21/10)

    2015 Ford Focus SE Sport FWD
    2013 Lincoln MKS EcoBoost AWD (377whp/423tq).
    2010 Ford Fusion Sport FWD
    1989.5 Ford Mustang 5.0 LXsport

  13. #13
    Join Date
    May 2011
    Location
    Schenectady, NY
    Posts
    1,246
    No driveability issues with my 3500 stall. Only grip issues arise now lol
    300A Black
    4:10 gears, Flowmaster 44's with rear cat delete, SW headers with 3 inch cats to 2.5 custom h. 3500 stall, Twisted synergy dyno tune, addco f/r , rear control arms, Novi 1200 air to air with the fixings.

  14. #14
    Join Date
    Apr 2013
    Location
    Stanberry, Missouri
    Age
    51
    Posts
    311
    No stall in the Rauder, but I do have a 3200 Circle D in my Monte Carlo. I am running a LY6 (6.0) and a 4L85E. I have used many old school stalls behind old school SBC and loved the fun moments and hated driving to town.

    This Circle D is great. Pulls from idle if I drive easy, but will flash and let them rip on a moments notice. The tech staff was good to. I have had the converter in since 2011.

    HTH

  15. #15
    Join Date
    Jan 2006
    Location
    Northern California
    Posts
    2,373
    I purchased a Circle D. Thanks to all for the input.

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