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can someone please explain to me what this does. lets say you have a protorque 4400 or builderbill 3700 what does this mean? you can power brake that high? and what purpose does it serve if it's not for power braking?
 

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Stall converter lets u stall up to a certain rpm that would be in your power curve...


Did you know I sent this from my Autoguide iPhone app!
 

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The BEST and REAL way to check your stall is data log.
Nail it from a high idle (1000 rpm) without tire spin and see where it flashes to or rolls over.
Pretty simple.
The brake stuff only checks yours brakes...really.;)
Post up your data or I'll subscribe to this thread and post up mine and help you check this out.
BTW...my rig is NOT a good example for you because I built my converter to flash at 3000, exactly where I launch at with my tranny brake and 2 step.....NO FLASH. My twin turbos make the power to "pull through" without stall.
Not great for the normal rig.
Just give me the data and I'll help.:):)
With this thread I'll show you how to read the data log of your power and converter.

To start, an "off the shelf" converter or buying your buddies converter is NOT the way to go.
So many variables....a converter NEEDS to be built to match your combination. Yep NEEDS.
BBill
 

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Good thread, what do you mean it needs to be built? Wouldn't you add one in your build, like what I did with my 426? I had them incorporated it in. I believe I went with a precision industries double plate tq. This was the one that was suggested that had good working relations with my particular build.
 

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Bill likes to look at your dyno sheets, data logs & all your mods so that he can build your stall with a stall speed matched to everything. That way its set at the perfect sweet spot. Individually hand built is always better than mass produced.

Jim
 

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So the $10,000 question is this..is a converter swap undetectable to the wife? Yes Chad I am thinking about a converter swap!
The only time I notice my 3400 dominator is low speed in 2nd before it locks up. Otherwise stock driveability. If you punch it it does flash higher, but that is fun at the stoplights ;)
 
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My mods are SRT Max cam, ported intake, CMR tune, CAI, MTCM, under drive pulley and ported TB. Ran 12.50 at just under 109. It is my DD. Would 3400 be too much? What did you pay to have it installed. How long was the Jeep out?
 

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My mods are SRT Max cam, ported intake, CMR tune, CAI, MTCM, under drive pulley and ported TB. Ran 12.50 at just under 109. It is my DD. Would 3400 be too much? What did you pay to have it installed. How long was the Jeep out?
You would greatly benefit from a higher stall with the SRT Max cam to get it into the powerband quicker.
 
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Subscribed. Have wanted to know more about this as well. I'm sorry if this sounds like a dumb question but how would having a higher stall converter add more hp/tq?
A properly matched converter will allow your jeep to launch with the most power possible. When you nail the gas from a stop your jeep is making like 200hp because it's only at like 2500rpm. With a higher stall converter you can launch it at a much higher horsepower because the rpm is higher also.
 

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I would take the scientific approach and have the vehicle specifically dynoed with your tuner to see where exactly it is making the power/torque at present and what mods you intend to do in order to customise the convertor for your driving habits and to suit your future goals.

My mods are SRT Max cam, ported intake, CMR tune, CAI, MTCM, under drive pulley and ported TB. Ran 12.50 at just under 109. It is my DD. Would 3400 be too much? What did you pay to have it installed. How long was the Jeep out?
 
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My mods are SRT Max cam, ported intake, CMR tune, CAI, MTCM, under drive pulley and ported TB. Ran 12.50 at just under 109. It is my DD. Would 3400 be too much? What did you pay to have it installed. How long was the Jeep out?
I think you should at least send your datalogs to BBill and let him choose the best one for you. I paid $400 for install and it took them 8 hours to do it. I had a local independent transmission shop do it on a Saturday, so they charged me way less than normal.
 

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what does it mean when the converter "locks up"??? whats it mean when it "flashes"??? so u dont have to actually brakstall at say 4400 if u have a coverter build with a 4400 stall speed??
 

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what does it mean when the converter "locks up"??? whats it mean when it "flashes"??? so u dont have to actually brakstall at say 4400 if u have a coverter build with a 4400 stall speed??
Flash is when the torque converter "rolls over"...it can be seen on your data log where your rpm goes somewhat horizontal before it hits again.

Our converters lockup about 96% starting in 2nd gear.
I've just installed a full racepac system to data log the converter lockup pressures.
I'll be able to see what % of lockup we have now as the racepac calculates the engine rpm (through my crank sensor mounted on the balancer) vs. driveshaft rpm (8 magnet collar on the driveshaft).

My goal is to tweak the tranny to give more pressure to the torque converter so it locks up close to 100% :)

BTW, brake torquing only really checks the holding ability of the brakes, NOT a good indicator of flash stall.

Bill
 
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