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Torque Converter stall speed #1903910 09/01/15 12:36 PM 09/01/15 12:36 PM
Joined: Mar 2004 Posts: 231 USA B5496RR OP enthusiast
B5496RR OP enthusiast Joined: Mar 2004 Posts: 231 USA	A question related towards torque converter stall speed. In a three speed trans (727). Should the stall speed be at the maximum torque RPM when attempting to accomplish the fastest ET/MPH in the 1/4 mile?

Re: Torque Converter stall speed [Re: B5496RR] #1903917 09/01/15 12:41 PM 09/01/15 12:41 PM
Joined: Jan 2003 Posts: 11,705 Portage,michigan B B3422W5 I Live Here
B3422W5 I Live Here B Joined: Jan 2003 Posts: 11,705 Portage,michigan	I have always had good luck with the convertor flash being 200-300 rpm over max torque rpm. IE..... If max torque is at 5200, try to set the convertor up to flash at 5400-5500 Last edited by B3422W5; 09/01/15 12:42 PM. 69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8

Re: Torque Converter stall speed [Re: B5496RR] #1904152 09/01/15 03:29 PM 09/01/15 03:29 PM
Joined: May 2003 Posts: 13,185 aZLiViN J J_BODY I Live Here
J_BODY I Live Here J Joined: May 2003 Posts: 13,185 aZLiViN	My 8" was flashing at 5800 which was right around the area of peak tq. Just got it back from Ultimate and should be right around 6k. Data recording was showing a small dip in eng rpm on the initial hit.

Re: Torque Converter stall speed [Re: B5496RR] #1904172 09/01/15 04:02 PM 09/01/15 04:02 PM
Joined: Mar 2004 Posts: 231 USA B5496RR OP enthusiast
B5496RR OP enthusiast Joined: Mar 2004 Posts: 231 USA	B3422W5 - Thanks for the fast response. Always good, clear and concise info from you! J_Body - Are you stating that your converter is now hopefully setup to flash/stall at peak TQ? Thanks for the replies

Re: Torque Converter stall speed [Re: B5496RR] #1904302 09/01/15 06:51 PM 09/01/15 06:51 PM
Joined: Jan 2003 Posts: 9,983 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,983 Frostbitefalls MN (Rocky&Bullw...	I have had good luck going loose over the years. When the air goes away and engine torque is down the lose converter is still up in the best rpm area for overall performance. Another advantage is that if there is a touch of tire slippage the converter stall is dragged down a bit but is still above peak torque and actually works a bit harder ( starts to lock up) making the car more consistent with less loss of acceleration. A rough rule of thumb is 1100 to 1300 rpm from stall rpm to shift point . Last edited by gregsdart; 09/01/15 06:54 PM. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Torque Converter stall speed [Re: B5496RR] #1904544 09/01/15 11:16 PM 09/01/15 11:16 PM
Joined: May 2003 Posts: 13,185 aZLiViN J J_BODY I Live Here
J_BODY I Live Here J Joined: May 2003 Posts: 13,185 aZLiViN	on numerous data recordings we had a "stall" at launch which was determined the converter dragging the engine down too much. Dyno peak torque was 5700-5800 so we loosened the stall speed some. should be at or a little above 6K now, which will probably change again when we go from the 4.30 gear to a better suited 4.88. Higher numerical gear will help get the weight going easier, which can also have an effect on stall speed too as the engine isn't having to work as hard. In other words I've been overwhelmed with information, but am trying to use it as best as I can to optimize what I've got.

Re: Torque Converter stall speed [Re: J_BODY] #1904557 09/01/15 11:26 PM 09/01/15 11:26 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Originally Posted By J_BODY on numerous data recordings we had a "stall" at launch which was determined the converter dragging the engine down too much. Dyno peak torque was 5700-5800 so we loosened the stall speed some. should be at or a little above 6K now, which will probably change again when we go from the 4.30 gear to a better suited 4.88. Higher numerical gear will help get the weight going easier, which can also have an effect on stall speed too as the engine isn't having to work as hard. In other words I've been overwhelmed with information, but am trying to use it as best as I can to optimize what I've got. Its gonna matter how much torque is at that RPM... big torque wont pull down like a lesser torque engine.... then weight is the other factor

Re: Torque Converter stall speed [Re: B5496RR] #1904828 09/02/15 12:48 PM 09/02/15 12:48 PM
Joined: Mar 2004 Posts: 231 USA B5496RR OP enthusiast
B5496RR OP enthusiast Joined: Mar 2004 Posts: 231 USA	Excellent info and feedback! Thank you!

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