brian89
New member
Buying a tc and trying to figure out what all the claims are, high stall? 4 or 6 stud? Hand welded fins? Number of fins?
torque converter question
- Thread starter brian89
- Start date
patrickke
New member
I'm trying to figure out what exactly your question out
96stroken and smokin
New member
I think what he's asking is what stall he needs and if he has 4 or 6 studs or which is better? For the other one I think he wants to know if it's better if it's hand welded? The last part I don't know.
patrickke
New member
Well a couple things I need to know would be what he does with the truck etc
brian89
New member
Sorry ha, what is a high stall and why would i need it? what exactly is the stall? Is a 4 or a 6 stud better? Is the number of fins really an issue? and is a greater or lesser number better? For a daily driven truck that rarely tows what would i be looking for that is best and I'm not paying for something that is more that what i need
chappy
New member
Your truck is a 6 stud so a 4 stud won't work. stall depends on mods or preferance. with just a tuner then I would say around the stock stall would probably be best. With stage 1's and a chip on my 99 I went to a lower then stock stall and hated it. I wished I would have went with stock but the guy was sure I needed a lower stall with a stock turbo.
brian89
New member
That was very helpful, now what exactly is the "stall" and why's low better than high?
Mark Kovalsky
Active member
Stall speed is the maximum engine speed at full power with the truck not moving. If you try this on your truck, I'm not responsible if you break it!
With the brake pedal pushed as hard as you can, trans in drive, mash the go pedal to the floor. The maximum engine speed is the stall speed for that torque converter. If you do this for more than 5 seconds I can promise you it will get expen$ive really fast.
In many people's opinion, including mine, the factory diesel torque converters have too high of a stall speed. Stall speed ideally should be close to the RPM where the engine makes peak torque. The 7.3L makes peak torque at 1600 RPM, but the converter stalls around 2000-2100 RPM. Why did Ford do that? When upper management drove the early prototypes they liked the way a higher stall speed drove. It doesn't make sense to me, don't try to understand it yourself, we're professionals! :clapping:
Lower stall will also produce better fuel economy. The converter has less slip whenever it's unlocked (except when stopped, where it's the same) so there is less heat generated in the torque converter, and the engine runs slower. Both use less fuel.
With the brake pedal pushed as hard as you can, trans in drive, mash the go pedal to the floor. The maximum engine speed is the stall speed for that torque converter. If you do this for more than 5 seconds I can promise you it will get expen$ive really fast.
In many people's opinion, including mine, the factory diesel torque converters have too high of a stall speed. Stall speed ideally should be close to the RPM where the engine makes peak torque. The 7.3L makes peak torque at 1600 RPM, but the converter stalls around 2000-2100 RPM. Why did Ford do that? When upper management drove the early prototypes they liked the way a higher stall speed drove. It doesn't make sense to me, don't try to understand it yourself, we're professionals! :clapping:
Lower stall will also produce better fuel economy. The converter has less slip whenever it's unlocked (except when stopped, where it's the same) so there is less heat generated in the torque converter, and the engine runs slower. Both use less fuel.
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Well if it's in 2x4 it's just going to roast the rear tires, and if it's in 4x4 it will usually just over-ride my brakes... :toast:
kingranchstroker
Member
Precision industries I have one and love it ! Its a 1600 rpm stall but I like how it drives when I leave a stop light I barely get into it to keep up with traffic .. just my opinion
brian89
New member
Ok now with this being said, which is best for orlando FL driving and occasional trips to PA?
Mark Kovalsky
Active member
I think the low stall converter is best for all uses except drag racing.
brian89
New member
why would anybody want a high stall then? other than for drag racing and why did chappy hate the low stall?
Mark Kovalsky
Active member
Some people like to hear the engine rev. I can't answer why someone didn't like the low stall, they would have to answer that.
chappy
New member
I will answer. With my truck lifted on 36's it was to laggy to light the turbo. If it was regeared for the 36's then I might have liked the lower stall. It was just harder to get the turbo lit.
brian89
New member
What is the stall on yours?
Dieselboy.
New member
Hmm , I wonder what my stall speed is ??? Or if its the PCS that doesnt lock it up until the set MPH.
I can hold my truck at 2800rpm at 30psi of boost and then launch....
I can hold my truck at 2800rpm at 30psi of boost and then launch....
