convertor disappointment long post
#1081382
09/24/11 10:18 AM
09/24/11 10:18 AM
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Joined: Apr 2005
Posts: 399 metro detroit
turner
OP
enthusiast
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OP
enthusiast
Joined: Apr 2005
Posts: 399
metro detroit
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I was running a Coan 3500 convertor, turning 7.14 1/8 mile times. I took my car, had it dynoed and determined my peak torque was at 5200 rpms and was 430ft/lbs, upon discussion with fellow racers and the dyno shop i was told that I should get a convertor around the same rpm stall as what my peak torque was approx. I BORROWED a friends TA convertor that supposedly flashed at about 5400, This convertor was in his ride when he blew his motor, and i think it got hurt. The convertor has tons of slippage on its 2-3 shift, so much Im worried about my trans., my 3500 Coan never slipped on the 2-3 shift.
I ran the car 2 passes at a track with no bite of the line first pass, I footbrake the car holding my foot on the brake and take the motor to 3700 rpms and launch, the tires went up in smoke hit my revlimiter and I shifted and the tires go up in smoke again....no traction
on my second pass i picked the other lane and launched ok with a 1.62 60' time wich is what my 3500 convertor does, everything felt good until I shifted from 2-3 wich slipped horribly.....ended up runnning a 11.32 at 122mph.....it seemed once 3rd gesr caught it started charging hard on the top end, but probably slipped for a whole second.
I believe this convertor is too much for my combo, and I believe that this convertor is hurt, the service desk at Turbo Action warned me the convertor could be hurt if it was in when the old owner hurt his race motor and then let me borrow it.
Is the slipping 2-3 shift an indication of a bad convertor, My trans was shifting fine last week with my other convertor.I was looking for my first 10 second run and it looks like I have the MPH but the slipping killed it, I have never ran my 3500 convertor in the 1/4 mile, but I may just get my 10.99 with that convertor
Does anybody have a similar isssue with a hurt convertor and what times should have been had at the 122MPH mark?
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Re: convertor disappointment long post
[Re: turner]
#1081388
09/24/11 01:25 PM
09/24/11 01:25 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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i'm thinking your low on fluid. unless your motor is very similar to your buddies race motor i would think the converter would stall a little lower. give it a second chance
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: convertor disappointment long post
[Re: turner]
#1081389
09/24/11 02:27 PM
09/24/11 02:27 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Two things come to mind, one is fluid level and the other is cable adjustment Make sure that the cable is adjusted so the pin will slide right into the shift lever in all three forward gears if it won't adjust it so it will when trans slip on the 1 2 shift(EDITED or any gear change) it is the trans, not the converter as already said Now, get to work
Last edited by Cab_Burge; 09/24/11 02:44 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: convertor disappointment long post
[Re: turner]
#1081391
09/24/11 04:49 PM
09/24/11 04:49 PM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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What cam, comp, weight, tyre size and gear do you have. Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: convertor disappointment long post
[Re: turner]
#1081392
09/24/11 05:58 PM
09/24/11 05:58 PM
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Joined: Oct 2005
Posts: 164 Savannah, GA
mopar400
member
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member
Joined: Oct 2005
Posts: 164
Savannah, GA
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Make sure you're checking the fluid in Neutral I know this should be obvious on this forum but is commonly overlooked. Kevin
1965 Fury II
1970 Challenger 440, 509 cam, 11:1 w/ 452 iron heads, 6.99 1/8, 11.29@ 120mph 1/4
(1999 Magnolia Drag strip track champion)
1992 Jeep XJ Crawler
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Re: convertor disappointment long post
[Re: rickraw]
#1081394
09/25/11 12:06 AM
09/25/11 12:06 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Why would you change out converters? When you got the Coan did they set it up for your current combo? You can "never" trust a used cnverter, Plus it'll flash differently from 1 combo too another, Its not just the engines torque that dictates that, its also the weight its pulling & so forth, I'd do like the others suggest, but IMO it could be the converter, not thats its "bad", just its reaction too "your" combo. You say that converter flashes 5400 from what you were told, Your peak torque is 5200, thats the 1st. problem, it needs to be at or a bit lower then peak torque. & did you "test" flash this converter in 3rd. gear at around 15-20 mph to see where it went in "your" car? I say the engine has more load in 2nd. 3rd. gear so if the converter is flashing too high for the peak torque, Its going to feel spongy in the higher gear shifts & slip more, Its not that the engine is making "less" HP/Torque in the higher gears, its just under more load so its affected & the converter will react to those changes.
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