Stall Speed

[ZZebes]

Alright, i understand engines and transmissions. But for the life of me i dont understand Torque converters. Well i mean I understand how they work and how they are made. But for the love of god would someone please explain to me what the Stall speed does and why one would change it.

[Wingnut]

Think of it as your clutch.

 

If you have a 3600 stall...You're going to be at 3600 RPM's before it's locked.

[ZZebes]

So lockup is 100% power transfer. So lower Stall Speed equals better launch???

[99Silver6.0]

Think of it as your clutch.

 

If you have a 3600 stall...You're going to be at 3600 RPM's before it's locked.

 

<{POST_SNAPBACK}>

 

 

 

The converter doesnt actually lock per say at 3600. The clutch in the converter wont lock until a certain MPH spec has been met and the PCM recognizes it. Stock programming in the PCM wont allow the verter to lock in second gear. It has values entered at 255MPH which is infinite and can never be met. Third is when the clutch will get locked depending on MPH, TPS and what temp the trnany is at.

 

Youll usually see 2 actual stall speeds. One when you mash the gas at a light. That is going to show you what it will "flash stall" to. That RPM is usually higher than a converters off-the-shelf rated RPM. My Vig 2800 would flash to 3000-3100. On the other hand youll see a totally different lower RPM from a brake stall. Sometimes its the rated RPM and sometimes its lower. All depends on verter builder. Loose or high RPM verters will allow your engine to flare to a higher, power making RPM.

 

Most of the time when you put a large cam in a truck you are going to loose low end. Fact of life, it DOES happen. No cam is awesome at every RPM. This is where a good TQ converter comes into play. It will let your engine rev to an RPM where its making power. Whereas the stock converter wont let you do that. You gotta decide ahead of time wether or not your willing to get a new verter before you pick a cam. I hate seeing people get a huge cam and get pissed because their low end sucks. Plus they arent willing to get a converter, im wandering off topic now. My bad. Anyway, there are many builders out there and really only one I would use. No Yanks is NOT one of them and im not going to get into why. Period! PI makes the best TQ converter money can buy. Yes you will pay for it but your paying for one hell of a piece! How much power you are gonna make, any power adders you are using all need to be factored into the picture when picking a verter. Otherwise youll run itno problems down the road.

 

Oh yea. Youll have alot more fun driving with a higher stall converter!! Trust me!

[ZZebes]

alright well i am looking to put a Z06 cam in and swap my gears to 3.73's what would be a good stall to get for my truck to fly but still be able to tow and be daily driveable. on that hand. is there a better cam than the Z06 for my 5.3L to meet my requirements??

 

Power all around

Good Daily driver

Still can tow

 

Would a 3000 stall or a 2800 stall be right or is that to high???

[99Silver6.0]

alright well i am looking to put a Z06 cam in and swap my gears to 3.73's what would be a good stall to get for my truck to fly but still be able to tow and be daily driveable. on that hand. is there a better cam than the Z06 for my 5.3L to meet my requirements??

 

Power all around

Good Daily driver

Still can tow

 

Would a 3000 stall or a 2800 stall be right or is that to high???

 

<{POST_SNAPBACK}>

 

 

 

2600-2800 will suit your needs fine. Just dont get a smaller diameter converter!! That is the big kicker. A smaller than stock converter does not have the towing ability that a large 12" verter has. My PI Vig was a 9.5" setup. Got hot quick and was loose as hell!!

 

Yes there are many better cams out there. What are your goals? Thunders 220/220 would be well set with a 2800 stall!! Have a good lope to the idle too!! But it will require a tune to be driveable.

[ZZebes]

January = Custom Dyno Tune at Motorsport Technologies in houston

February = 3.73's to replace my 3.23's

 

Soon after will be the cam and the TC if needed at the same time but probably some time after.

 

I was nosing around on Cranes website and found these, Opinions are welcomed

 

http://www.compcams.com/Technical/Search/C...umber=54-450-11

http://www.compcams.com/Technical/Search/C...umber=54-451-11

http://www.compcams.com/Technical/Search/C...umber=54-525-11

[99Silver6.0]

January = Custom Dyno Tune at Motorsport Technologies in houston

February = 3.73's to replace my 3.23's

 

Soon after will be the cam and the TC if needed at the same time but probably some time after.

 

I was nosing around on Cranes website and found these, Opinions are welcomed

 

http://www.compcams.com/Technical/Search/C...umber=54-450-11

http://www.compcams.com/Technical/Search/C...umber=54-451-11

http://www.compcams.com/Technical/Search/C...umber=54-525-11

 

<{POST_SNAPBACK}>

 

 

 

Thats actually CompCams site. Dont even waste your time with the 3rd cam. Its way too close to stock. The 206/212 would get my vote. But, if your gonna get a converter, you can go alot bigger with the cam!!!! And I would if I were you.

[ZZebes]

when you say bigger... Do you have any examples.

[mannymach1]

Have you thought about going to 4.10 gearing and skipping the rest of the mods????

[ZZebes]

Considered it but I can swap to 3.73's and still have decent highway manners and the cam will allow gas mileage on the highway to stay completely away from 0

[mannymach1]

I'm not sure what mileage your getting right now or looking for, but I have a 2500HD Crew cab long bed with a 6.0 and 4.10 gearing. I'm getting between 13 to 14.5 mpg on the highway with speeds in between 70 to 80 with revs in the range of 2300 to 3000.

[Wingnut]

Think of it as your clutch.

 

If you have a 3600 stall...You're going to be at 3600 RPM's before it's locked.

 

<{POST_SNAPBACK}>

 

 

 

The converter doesnt actually lock per say at 3600. The clutch in the converter wont lock until a certain MPH spec has been met and the PCM recognizes it. Stock programming in the PCM wont allow the verter to lock in second gear. It has values entered at 255MPH which is infinite and can never be met. Third is when the clutch will get locked depending on MPH, TPS and what temp the trnany is at.

 

Youll usually see 2 actual stall speeds. One when you mash the gas at a light. That is going to show you what it will "flash stall" to. That RPM is usually higher than a converters off-the-shelf rated RPM. My Vig 2800 would flash to 3000-3100. On the other hand youll see a totally different lower RPM from a brake stall. Sometimes its the rated RPM and sometimes its lower. All depends on verter builder. Loose or high RPM verters will allow your engine to flare to a higher, power making RPM.

 

Most of the time when you put a large cam in a truck you are going to loose low end. Fact of life, it DOES happen. No cam is awesome at every RPM. This is where a good TQ converter comes into play. It will let your engine rev to an RPM where its making power. Whereas the stock converter wont let you do that. You gotta decide ahead of time wether or not your willing to get a new verter before you pick a cam. I hate seeing people get a huge cam and get pissed because their low end sucks. Plus they arent willing to get a converter, im wandering off topic now. My bad. Anyway, there are many builders out there and really only one I would use. No Yanks is NOT one of them and im not going to get into why. Period! PI makes the best TQ converter money can buy. Yes you will pay for it but your paying for one hell of a piece! How much power you are gonna make, any power adders you are using all need to be factored into the picture when picking a verter. Otherwise youll run itno problems down the road.

 

Oh yea. Youll have alot more fun driving with a higher stall converter!! Trust me!

 

<{POST_SNAPBACK}>

 

 

 

 

 

I was being as simple as I could possibly be.

 

I'd love to get a vig in my truck, but I do too many highway/road trips, and I need to tow...So it looks like I won't be doing it.

 

Besides, my tranny went boom last week...Dammit.

[99Silver6.0]

Think of it as your clutch.

 

If you have a 3600 stall...You're going to be at 3600 RPM's before it's locked.

 

<{POST_SNAPBACK}>

 

 

 

The converter doesnt actually lock per say at 3600. The clutch in the converter wont lock until a certain MPH spec has been met and the PCM recognizes it. Stock programming in the PCM wont allow the verter to lock in second gear. It has values entered at 255MPH which is infinite and can never be met. Third is when the clutch will get locked depending on MPH, TPS and what temp the trnany is at.

 

Youll usually see 2 actual stall speeds. One when you mash the gas at a light. That is going to show you what it will "flash stall" to. That RPM is usually higher than a converters off-the-shelf rated RPM. My Vig 2800 would flash to 3000-3100. On the other hand youll see a totally different lower RPM from a brake stall. Sometimes its the rated RPM and sometimes its lower. All depends on verter builder. Loose or high RPM verters will allow your engine to flare to a higher, power making RPM.

 

Most of the time when you put a large cam in a truck you are going to loose low end. Fact of life, it DOES happen. No cam is awesome at every RPM. This is where a good TQ converter comes into play. It will let your engine rev to an RPM where its making power. Whereas the stock converter wont let you do that. You gotta decide ahead of time wether or not your willing to get a new verter before you pick a cam. I hate seeing people get a huge cam and get pissed because their low end sucks. Plus they arent willing to get a converter, im wandering off topic now. My bad. Anyway, there are many builders out there and really only one I would use. No Yanks is NOT one of them and im not going to get into why. Period! PI makes the best TQ converter money can buy. Yes you will pay for it but your paying for one hell of a piece! How much power you are gonna make, any power adders you are using all need to be factored into the picture when picking a verter. Otherwise youll run itno problems down the road.

 

Oh yea. Youll have alot more fun driving with a higher stall converter!! Trust me!

 

<{POST_SNAPBACK}>

 

 

 

 

 

I was being as simple as I could possibly be.

 

I'd love to get a vig in my truck, but I do too many highway/road trips, and I need to tow...So it looks like I won't be doing it.

 

Besides, my tranny went boom last week...Dammit.

 

<{POST_SNAPBACK}>

 

 

 

 

 

I hear ya man. Triple dics Vigs are vicious! Especially when the clutch locks. Feels like getting rear ended. You could always look to a stock sized Yank in 25-2800RPM's for a stall speed! Yet still feel stock and retain a good amount of your towing ability. OR you can get a converter from a 4.2 inline 6 Trailblazer. Stall to 2500-2600 behind a 5.3. Best part of all they have an awesome tow rating! Thats the cheap way out.

[Wingnut]

Think of it as your clutch.

 

If you have a 3600 stall...You're going to be at 3600 RPM's before it's locked.

 

<{POST_SNAPBACK}>

 

 

 

The converter doesnt actually lock per say at 3600. The clutch in the converter wont lock until a certain MPH spec has been met and the PCM recognizes it. Stock programming in the PCM wont allow the verter to lock in second gear. It has values entered at 255MPH which is infinite and can never be met. Third is when the clutch will get locked depending on MPH, TPS and what temp the trnany is at.

 

Youll usually see 2 actual stall speeds. One when you mash the gas at a light. That is going to show you what it will "flash stall" to. That RPM is usually higher than a converters off-the-shelf rated RPM. My Vig 2800 would flash to 3000-3100. On the other hand youll see a totally different lower RPM from a brake stall. Sometimes its the rated RPM and sometimes its lower. All depends on verter builder. Loose or high RPM verters will allow your engine to flare to a higher, power making RPM.

 

Most of the time when you put a large cam in a truck you are going to loose low end. Fact of life, it DOES happen. No cam is awesome at every RPM. This is where a good TQ converter comes into play. It will let your engine rev to an RPM where its making power. Whereas the stock converter wont let you do that. You gotta decide ahead of time wether or not your willing to get a new verter before you pick a cam. I hate seeing people get a huge cam and get pissed because their low end sucks. Plus they arent willing to get a converter, im wandering off topic now. My bad. Anyway, there are many builders out there and really only one I would use. No Yanks is NOT one of them and im not going to get into why. Period! PI makes the best TQ converter money can buy. Yes you will pay for it but your paying for one hell of a piece! How much power you are gonna make, any power adders you are using all need to be factored into the picture when picking a verter. Otherwise youll run itno problems down the road.

 

Oh yea. Youll have alot more fun driving with a higher stall converter!! Trust me!

 

<{POST_SNAPBACK}>

 

 

 

 

 

I was being as simple as I could possibly be.

 

I'd love to get a vig in my truck, but I do too many highway/road trips, and I need to tow...So it looks like I won't be doing it.

 

Besides, my tranny went boom last week...Dammit.

 

<{POST_SNAPBACK}>

 

 

 

 

 

I hear ya man. Triple dics Vigs are vicious! Especially when the clutch locks. Feels like getting rear ended. You could always look to a stock sized Yank in 25-2800RPM's for a stall speed! Yet still feel stock and retain a good amount of your towing ability. OR you can get a converter from a 4.2 inline 6 Trailblazer. Stall to 2500-2600 behind a 5.3. Best part of all they have an awesome tow rating! Thats the cheap way out.

 

<{POST_SNAPBACK}>

 

 

 

 

I've looked at that...But I'm probably just going to leave it stock until the warranty is out. I get the feeling that this isn't the only time it's going to come apart. A ton of the AWD TB SS's are sh*tting trannies, some of the 2WD's too.