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  #1  
Old 04-06-2016, 10:39 AM
fallonracer fallonracer is offline
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Default PTC 9" spragless torque converter
Has anyone used a PTC spragless torque converter and what was the results. I know they say a spragless torque converter can lose .10 and 2-3mph hr over a converter with sprag if the converter was a perfect match for your combo. Was running a 8" TCI convertor sprag type (group 1 ) bought from Butler 10 years ago stalls 4900 but has a 15% slip ratio when I was running 4.10 gears, with 4.56 gears the slip ratio came down to 7% . I had PTC build me a 9" 5000 stall converter spragless was hoping to make the car a little more consistent ET wise. It's a bracket car so I'm willing to give up a little ET/MPH to run more consistent. 3350 lbs car running 10.0-10.20. 455 th-400 5000 stall 4.10 (4.33 on the self waiting to go in).

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Old 04-06-2016, 11:03 AM
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Originally Posted by fallonracer View Post
Has anyone used a PTC spragless torque converter and what was the results. I know they say a spragless torque converter can lose .10 and 2-3mph hr over a converter with sprag if the converter was a perfect match for your combo. Was running a 8" TCI convertor sprag type (group 1 ) bought from Butler 10 years ago stalls 4900 but has a 15% slip ratio when I was running 4.10 gears, with 4.56 gears the slip ratio came down to 7% . I had PTC build me a 9" 5000 stall converter spragless was hoping to make the car a little more consistent ET wise. It's a bracket car so I'm willing to give up a little ET/MPH to run more consistent. 3350 lbs car running 10.0-10.20. 455 th-400 5000 stall 4.10 (4.33 on the self waiting to go in).
All my ptc's are spragless and I had one converted to a mechanical diode and didn't see a difference at all. I don't believe in the mechanical diode BS. LOL.

It should run the same if the converter is right, maybe faster if this converter is better.

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  #3  
Old 04-06-2016, 11:10 AM
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X2^

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Old 04-06-2016, 01:08 PM
fallonracer fallonracer is offline
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Hey Jeff / Mike what size converter are you running 8"-9"-10"

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Old 04-06-2016, 02:13 PM
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8" ptc

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Old 04-06-2016, 09:08 PM
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PTC 10" spragless here.

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Old 04-06-2016, 09:12 PM
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10" PTC spragless here also

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Old 04-07-2016, 11:01 AM
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8" ptc
1100 HP into an 8" OD whorl all for momentum transfer. Still a high WOW for me.

Makes a case for higher density converter fluid.

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  #9  
Old 04-07-2016, 12:13 PM
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10" Transmission Specialties spragless convertor.


GTO George

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Old 04-07-2016, 09:22 PM
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Originally Posted by Half-Inch Stud View Post
1100 HP into an 8" OD whorl all for momentum transfer. Still a high WOW for me.

Makes a case for higher density converter fluid.
Tried that and talked to some different convertor companies about it. It looked to be a bit tighter at launch but rpm and slip were pretty much the same.

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  #11  
Old 04-07-2016, 10:07 PM
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Hyguard

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Old 04-07-2016, 10:15 PM
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Converter flashes at 900 in the backhoes and 1000 in the scrapers.

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Old 04-07-2016, 10:58 PM
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Converter flashes at 900 in the backhoes and 1000 in the scrapers.
LOL

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