OEM/Marauder TC stall speed

[SergntMac]

The question "what is the factory stall speed on our Marauders" and I've answered 2800 RPM, because this is what I was told by a factory engineer. However, there have been other answers from other resounces, with no solid technical data. Well today, while looking up other stuff, I found it. Here it is straight from "The Big Red Book", Section 307-01-2.

Gran Marquis with 4.6L 2V SOHC engine...Minimum stall 2094 RPM, maximum stall 2440 RPM.

CV/PI with 4.6L 2V SOHC engine...Minumum 2319 RPM stall, maximum 2750 RPM stall.

Marauder with 4.6L 4V DOHC engine...Minimum 2555 RPM stall, maximum 3011 stall.

Hmmm...a 500 RPM spread in each case, maybe that's why Jerry W. told me "2800". All the marketing and technical specs I poured over just said "higher stall", and indeed it is.

Those of you who have purchased a PI Stallion TC with a 3000 RPM stall, prolly enjoy the same 500 RPM stall variable, i.e. minimum 3000 RPM, maximum 3500 RPM. Ditto for those who bought the 3500 stall, enjoying the spread between 3500 and 4000 RPM.

My Kenny Brown #1x came with a triple plate 3000 stall Stallion, and I later upgraded that to 3500 RPM. Now I better understand why my Marauder launches as sweet as it does, 3500 to 4000 RPMs is a nice place to start a 1/4 pass.

Hope this helps y'all in your future mod decisions.

[DEFYANT]

Is there a difference between 2003 and 2004 Marauder model years?

[STLR FN]

Is there a difference between 2003 and 2004 Marauder model years?I would venture,albeit cautiously, say yes. The sales brochures stated/said the '04 4R75 had a higher stall.

[Joe Walsh]

You took 'the words right out of my post' Charlie!

Also, I bought a 2800 rpm stall from ART CARR and it definitely stalls at a significantly higher rpm than the OEM TC.
I'm guessing that my spread is 2800-3300 rpm OR HIGHER due to the increased HP & TQ my rebuilt engine produces...

[Zack]

The factory converter stalls lower than a PI because it is so much heavier.

[SergntMac]

I would venture,albeit cautiously, say yes. The sales brochures stated/said the '04 4R75 had a higher stall. Yep...So does all my 2003 stuff, but the question has been "higher than what"?

According to the book, the Marauder indeed has a higher stall over other 2003 applications. I don't have an '04 book with data on the 4R75W tranny and converter, it may be even higher still, but I'm not leaning that way. Changes to the 2004 TC were mentioned, none stall specific.

Anyone have an '04 BRB, or DVD that can look it up?

[STLR FN]

Yep...So does all my 2003 stuff, but the question has been "higher than what"?

According to the book, the Marauder indeed has a higher stall over other 2003 applications. I don't have an '04 book with data on the 4R75W tranny and converter, it may be even higher still, but I'm not leaning that way. Changes to the 2004 TC were mentioned, none stall specific.

Anyone have an '04 BRB, or DVD that can look it up?That's why I said cautiously Mac wasn't too sure.

[Smokie]

Well just throw a little mud into the discussion, When I was N/A my EXISTING oem converter with lightly applied brakes would let the engine freely rev up to 2200 if I continued to apply power at about 2400-2500 the rear tires were screaming.

Don't know what the hell that means, just thought I throw it out there.:D

[STLR FN]

Well just throw a little mud into the discussion, When I was N/A my EXISTING oem converter with lightly applied brakes would let the engine freely rev up to 2200 if I continued to apply power at about 2400-2500 the rear tires were screaming.

Don't know what the hell that means, just thought I throw it out there.:DThat if I'm not mistaken is called your "brake stall".

[SergntMac]

Ask a dozen guys to define "stall speed" and you'll get a dozen answers, usually describing their end result, a burnout, or a launch. But, neither really describe what's taking place, which is bringing the engine to a particular speed, without stalling the engine, or, moving the car. Brake torquing is often innacurrate in measuring stall. Here's some 411 from Precision Industries' FAQs... www.converter.com/faqs.htm (http://www.converter.com/faqs.htm)

STALL SPEED
Torque converter stall is a commonly used term and is commonly misunderstood. Stall is the speed at which the converter will hold the engine speed and not allow further gain (i.e., the engine "stalls"). The key word here is engine. The speed at which stall occurs with a given converter is a function of engine peak torque. It is clear that the stall speed on a given converter will not be the same coupled to a tame small block engine when compared to a big block with all of the muscle features added. When comparing stall speeds it is important to account for the engine that drives it. True converter stall can best be determined when a Transbrake is used. Testing for stall value by locking the wheel brakes generally does not produce a true stall value because the engine power can often cause wheel turn by overpowering the brakes. Stall speed determined by this method should be identified as such when discussing stall speed determination. Flash stall is determined by launching at full throttle and observing the peak speed attained at launch. Selection of the right stall speed for your vehicle should be matched to the engine peak torque, engine torque curve shape and vehicle weight. In general, the stall speed selected for your converter would be 500 to 700 rpm below the peak torque. This speed allows the margin for application of the torque reserve on takeoff. When selecting stall speed without having prior experience to go by, it is better to conservatively estimate the engine torque than it is to over estimate it. If you over estimate the torque output you will have a converter with a stall speed too low, making your car slow off the line and have slow ET. A properly selected stall speed will give you better launch and better ET. You can see why it is important to consult with professionals prior to making a stall speed selection. Within the converter, stall speed is balanced off against inefficiency after launch. Getting desired stall at the expense of performance after launch is just as costly as improper stall speed to begin. The optimum converter has careful selection and design of changes to the impeller, turbine and stator"

This is the way I have learned the theory of stall speed long ago. To what RPM my engine will rise before the car moves under full power. With a 3500 stall, and from a dead stop standing start, I can mash the throttle to the floor, let her rip, and the ripping begins at 3500 RPM, which is the entry point of my particular power band.

The same stall speed will react differently on every car, but unlike many other cars out there, we share some very common traits among ourselves. This is also why Mr. Barnes can honestly say "save your money", because of the abundance of low end torque a Roots style supercharger delivers. He said long ago that the OEM torque converter was sufficient, and he was right. With a 2400 to 3000 RPM variable, all is well.

[Drock96Marquis]

Is there a difference between 2003 and 2004 Marauder model years?
The 2004 MM torque convertors are a higher quality unit. They use teflon seals and roller bearings.

[BUCKWHEAT]

So, may I conclude that putting my 04 MM TC into my 03 MM with the 03 tranny will yield "better" results...higher stall, more reliable performance?

[SergntMac]

So, may I conclude that putting my 04 MM TC into my 03 MM with the 03 tranny will yield "better" results...higher stall, more reliable performance? I would not draw this conclusion myself. Neither the '03 nor the '04 torque convertor has shown to be problematic. Higher stall than the '03 has not been researched.

If anything, I would have expected L/M to lower the stall due to early complaints of no low end power off the line.