Converter sprag question .
#2978291
10/25/21 04:57 PM
10/25/21 04:57 PM
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Joined: Mar 2009
Posts: 2,463 Sydney,Australia
tex013
OP
top fuel
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OP
top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
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Hi all , just another thinking out loud question regards converters . When using a mechanical diode/sprag has anyone noticed any difference to regular sprags ? I know the mechanical is considered stronger, almost unbreakable . Street/strip usage , transbrake .
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Converter sprag question .
[Re: tex013]
#2978482
10/26/21 08:19 AM
10/26/21 08:19 AM
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Joined: Jan 2003
Posts: 13,363 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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My cuda used to kill a "super" sprag every 100 runs or so. Went to a mechanical diode and no more problems. Last converter I had done we went spragless. Used to be that the spragless converters would slip a lot up top, but that doesn't seem to be the case anymore.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Converter sprag question .
[Re: an8sec70cuda]
#2978602
10/26/21 02:00 PM
10/26/21 02:00 PM
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Joined: Feb 2003
Posts: 2,560 S.E. Michigan
cl440
master
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master
Joined: Feb 2003
Posts: 2,560
S.E. Michigan
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My cuda used to kill a "super" sprag every 100 runs or so. Went to a mechanical diode and no more problems. Last converter I had done we went spragless. Used to be that the spragless converters would slip a lot up top, but that doesn't seem to be the case anymore. We were chasing an issue with the car a few years ago. Inconsistent ET's and reaction times. Lost MPH etc..... We changed ignitions, fuel pumps etc..... Finally we started to look at the symptoms of a failing sprag in the converter. Called Transmission specialties and discussed it with them. They convinced me to buy one of there super 8 9" spragless converters........One of the best purchases I have ever made! ET, MPH, Consistency all came back!
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Re: Converter sprag question .
[Re: cl440]
#2978661
10/26/21 04:58 PM
10/26/21 04:58 PM
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Joined: Mar 2009
Posts: 2,463 Sydney,Australia
tex013
OP
top fuel
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OP
top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
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thanks guys , i had been having 60 move around which is why i pulled trans . Only just got it back in last week . When i sent converter back to USA for service it came back with a mech diode and pretty much everything replaced but no explanation . There was some metal in pan , trans builder said it came from converter as rest of trans was good apart from wear on stator support (?) splines . If it picks up to the 60 i expect i should see better ET maybe a pinch of MPH if sprag was slipping
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Converter sprag question .
[Re: tex013]
#2978714
10/26/21 08:18 PM
10/26/21 08:18 PM
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Joined: May 2005
Posts: 1,030 ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,030
ohio
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thanks guys , iThere was some metal in pan , trans builder said it came from converter as rest of trans was good apart from wear on stator support (?) splines .
Tex I just went through this metal went through the whole transmission but inside was good, snap ring broke in the converter and destroy it . I have a new converter(actually2 now) and the 1 in the car has a mechanical diode seat of the pants feels great
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it. 67 Belvedere that worked it's way in the 10's
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Re: Converter sprag question .
[Re: 67mprfan]
#2978765
10/26/21 11:45 PM
10/26/21 11:45 PM
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Joined: Mar 2009
Posts: 2,463 Sydney,Australia
tex013
OP
top fuel
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OP
top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
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[ [/quote] I just went through this metal went through the whole transmission but inside was good, snap ring broke in the converter and destroy it . I have a new converter(actually2 now) and the 1 in the car has a mechanical diode seat of the pants feels great [/quote]
Converter was 5700 then with engine top end change 6000 . Explained this also and had it tightened back towards the 5700 . Definately feels better on street , firmer/tighter like my 5000 vert in spare trans . Now all i need is the sanction legal BS to be done locally so we can get back on track .
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Converter sprag question .
[Re: 67mprfan]
#2978778
10/27/21 02:44 AM
10/27/21 02:44 AM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Any time slips to look at yet? If so what are the 60 ft. times now compare to before?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Converter sprag question .
[Re: Cab_Burge]
#2978974
10/27/21 04:35 PM
10/27/21 04:35 PM
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Joined: Mar 2009
Posts: 2,463 Sydney,Australia
tex013
OP
top fuel
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OP
top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
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Any time slips to look at yet? If so what are the 60 ft. times now compare to before? Cab , there is legal argy bargy going on over track sanction now , after 3 1/2 months closed . I kind of doubt any passes here in Sydney till end of year at earliest . I am racing interstate in December so its a long wait to know and 13/14 hour drive to get there. Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Converter sprag question .
[Re: 440Jim]
#2980115
10/31/21 05:07 AM
10/31/21 05:07 AM
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Joined: Mar 2009
Posts: 2,463 Sydney,Australia
tex013
OP
top fuel
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OP
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Joined: Mar 2009
Posts: 2,463
Sydney,Australia
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Well looks like t&t this friday weather permitting . Sanction body ok'd by state govt , own track , legal argy bargy in court same day . Crossing my fingers though sure to be a bunfight due to lack of racing , i hope there is a number limit , and as usual the hero time trialists . I want to try leaving a little lower rpm .
Tex
Last edited by tex013; 10/31/21 05:09 AM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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