Re: Converter slip under power
[Re: AndyF]
#2777834
05/24/20 09:49 PM
05/24/20 09:49 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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I had a 10 inch"medium stall" from A&A behind a 408 in a 3450 lb car with 3.55 gears. It would flash to 4000 when i went WOT but would settle in at about 10 percent slip at cruise of 65 to 70 mph. A stock converter would probably slip 7 percent under the same conditions. At least that is what i saw in my dart. I had a lockup trans in it with the same gears and would see over 200 rpm slip at cruise speeds when not locked up.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Converter slip under power
[Re: AndyF]
#2777905
05/25/20 03:34 AM
05/25/20 03:34 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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Andy, do you know which converter company and model yours is? I had Chris at Contintental converters make me a custom 10 inch street and strip converter for my old pump gas Duster, that converter would foot stall right at 2300 RPM before pushing the 165x15 front tires through the staging beams, it would flash stall around 4200 to 4400 RPM depending on the track elevation and weather conditions. I broke it and install a Turbo Action 8 inch SS/AH Hemi foot brake converter I had in stock and that converter was way better on the street and at the track That change pick up my car at Madras .2+ ET and over 2+ MPH in the 1/8 mile , a little more gain at Woodburn also It drove real nice at light part throttle on the street and at the track and would flash stall up around 5200 RPM in high gear at WOT from a 35 to 45 MPH roll I think it had around 9% slippage across the finish line in the 1/4 mile
Last edited by Cab_Burge; 05/25/20 03:35 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Converter slip under power
[Re: AndyF]
#2778093
05/25/20 03:15 PM
05/25/20 03:15 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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We have noticed no real change in slip % using various gear rations. We used everything from a 5.00 to a 5.48 in the car depending on the weather conditions and track. Stator changes will affect it but minimally. The lock up deal certainly changed the slip% but does not show on the time slip. Well that's not entirely true. We run the back half better with the lockup but we are much worse down low 0-60-330 which is where all the ET is. We used to have to run 5.09-5.12 to run 8.0's we now are running 8.0's going 5.18-5.20. We also have a high speed dump in the trans to drop the line pressure once out of low gear. We are changing the gearset in the trans this year as well as pump and stator combo to try and get back to 1.10-1.13 60' and 5.0's in the 1/8, but we may not get a chance to see if any of the engine and trans changes do anything this year.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Converter slip under power
[Re: AndyF]
#2778719
05/27/20 12:44 PM
05/27/20 12:44 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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Since you most likely have a converter with as big a core and a tighter setup than my 10 inch AA, 3.55 or 3.73 gears with 27.5 inch tires should work fine. I sold that Dart, and the new owner drove it home 300 miles without any issues. 3.55 gears, 27.3 inch tall tires.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Converter slip under power
[Re: gregsdart]
#2778766
05/27/20 03:15 PM
05/27/20 03:15 PM
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Joined: Jan 2003
Posts: 14,496 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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Posts: 14,496
So. Burlington, Vt.
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I doubt the 4.10 vs 3.89 gearing will have much affect on either the track ET or street performance, other than perhaps very light throttle cruising rpm being slightly lower. The converter just slips more with that taller gears, so the speed vs rpm hardly changes.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Converter slip under power
[Re: fast68plymouth]
#2778803
05/27/20 04:53 PM
05/27/20 04:53 PM
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Joined: Jan 2003
Posts: 4,270 Morrow, OH
markz528
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master
Joined: Jan 2003
Posts: 4,270
Morrow, OH
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I don't have any experience on street driving, but on 1/4 mile passes I have had a converter at over 11% and my last combo 9 inch (getting a new motor and converter) is somewhere between 3 and 4%. Don't remember exactly. The high slip converters were 10 and 8 inch.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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