Please explain torque conveter stall speed effect
Thread Starter
Le Mans Master
Joined: Dec 2004
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From: Myrtle Beach SC
St. Jude Donor '05-'06
Please explain torque conveter stall speed effect
Sorta public service thread here as I am sure others want to know too.
Please explain the torque converter stall speed effects on our trannys.I think I know why racing engine uses a high stall converter just trying to confirm my thoughts. I am getting my Mad Dog stage 2 punisher installed with a 2000 stall converter what can I expect.
Please explain the torque converter stall speed effects on our trannys.I think I know why racing engine uses a high stall converter just trying to confirm my thoughts. I am getting my Mad Dog stage 2 punisher installed with a 2000 stall converter what can I expect.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
It works like a clutch in a manual, when it hits its stall speed, it locks up and sends all the power through the driveline.
You want it close to your torque peak, so you get a better launch.
Since it takes longer to lock, a higher stall TC causes more heat in the transmission.
You want it close to your torque peak, so you get a better launch.
Since it takes longer to lock, a higher stall TC causes more heat in the transmission.
Thread Starter
Le Mans Master
Joined: Dec 2004
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From: Myrtle Beach SC
St. Jude Donor '05-'06
So does a 2000 stall need an additional cooler?To get the best launch should I brake the car till it hits say 1500rpm before hammering it?
Last edited by Redeasysport; Aug 24, 2005 at 06:43 PM.
Burning Brakes
Joined: Nov 2003
Posts: 935
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From: Beverly, NJ
Originally Posted by Redeasysport
Sorta public service thread here as I am sure others want to know too.
Please explain the torque converter stall speed effects on our trannys.I think I know why racing engine uses a high stall converter just trying to confirm my thoughts. I am getting my Mad Dog stage 2 punisher installed with a 2000 stall converter what can I expect.
Please explain the torque converter stall speed effects on our trannys.I think I know why racing engine uses a high stall converter just trying to confirm my thoughts. I am getting my Mad Dog stage 2 punisher installed with a 2000 stall converter what can I expect.
Team Owner
Joined: Sep 2001
Posts: 62,160
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Launch technique is entirely personal, you have to just practice and practice some more.
To tell the truth every 700/4L60 on the planet needs an external cooler better than what the factory gives, upgraded TC or not.
To tell the truth every 700/4L60 on the planet needs an external cooler better than what the factory gives, upgraded TC or not.
Le Mans Master
Joined: Aug 2004
Posts: 5,141
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From: Metairie Louisiana
torque converter
I'm no expert but I was told by others here that with a well built TC, that does not have too high of a stall, a cooler is not needed. Plus correct me if I'm wrong but I think the late model C4's have factory coolers. But I've heard they are not very effective. I would go higher on the stall though. I was told that with my shift kit and 2800 stall TCI, I would even want higher eventually. So far I'm very satisfied. I usually rev it to around 2600 or so but I need to get to the track to see real times.
Last edited by rickneworleansla; Aug 24, 2005 at 07:16 PM. Reason: addition
Thread Starter
Le Mans Master
Joined: Dec 2004
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From: Myrtle Beach SC
St. Jude Donor '05-'06
I am not really going to go to the track much if ever but I would like to get the best launch I can so I chose a lower stall till/if I start modding the engine so I would not loose stock character.
So how should I do it in neutral or power brake it to 1500rpm?
So how should I do it in neutral or power brake it to 1500rpm?
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Le Mans Master
Joined: Aug 2004
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From: Metairie Louisiana
Tc
I did the neutral thing one time in a 91 ford escort. Please don't laugh. Yes I admit it, I once drove a ford. Anyway.. It was a four cylinder with an auto trans and I knew absolutely nothing about cars. I just wanted to see if I could make it peel out. Well it did along with leaving my transmission in the toilet. Thats the last time I ever did that. Lesson learned.
Le Mans Master
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From: Everett WA
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So if I understand this correctly (no nutral - keep it in drive)
If you just put your foor to the floor when the light turns green the car pretty much sits still untill the revs reach 2200 & then the TC locks up and you burn rubber.
If on the other hand if you just feather the gas .... even though it's not locked up you can just sort of take off normally without attracting attention. Correct?
If you just put your foor to the floor when the light turns green the car pretty much sits still untill the revs reach 2200 & then the TC locks up and you burn rubber.
If on the other hand if you just feather the gas .... even though it's not locked up you can just sort of take off normally without attracting attention. Correct?
Thread Starter
Le Mans Master
Joined: Dec 2004
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From: Myrtle Beach SC
St. Jude Donor '05-'06
Originally Posted by Mr. Peabody
So if I understand this correctly (no nutral - keep it in drive)
If you just put your foor to the floor when the light turns green the car pretty much sits still untill the revs reach 2200 & then the TC locks up and you burn rubber.
If on the other hand if you just feather the gas .... even though it's not locked up you can just sort of take off normally without attracting attention. Correct?
If you just put your foor to the floor when the light turns green the car pretty much sits still untill the revs reach 2200 & then the TC locks up and you burn rubber.
If on the other hand if you just feather the gas .... even though it's not locked up you can just sort of take off normally without attracting attention. Correct?
I knew people wanted to know this
Le Mans Master
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From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Well if my two previous assumptions are correct (meaning that I correctly understood Vaders explaination)....then I might want to get one of these ... so the next question is...
How much of as additional strain does a 2000, 2500, 3000 stall converter put on the rear portion of the drive train?
Sorry Redeasysport didn't mean to hijack your thread
How much of as additional strain does a 2000, 2500, 3000 stall converter put on the rear portion of the drive train?
Sorry Redeasysport didn't mean to hijack your thread
Race Director
Joined: Feb 2004
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More stall speed = more internal slippage. More slippage = more heat. Coolers are nescessary. Big stall converters require big coolers. When the torque converter goes into lock up, all parts turn at the same speed resulting in a 1:1 ratio. At this point there is no slippage at all and no extra heat is produced. Some guys eliminate the lock up feature. I like it. It keeps mileage up and heat down.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Originally Posted by Mr. Peabody
Well if my two previous assumptions are correct (meaning that I correctly understood Vaders explaination)....then I might want to get one of these ... so the next question is...
How much of as additional strain does a 2000, 2500, 3000 stall converter put on the rear portion of the drive train?
Sorry Redeasysport didn't mean to hijack your thread
How much of as additional strain does a 2000, 2500, 3000 stall converter put on the rear portion of the drive train?
Sorry Redeasysport didn't mean to hijack your thread
Thread Starter
Le Mans Master
Joined: Dec 2004
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From: Myrtle Beach SC
St. Jude Donor '05-'06
Originally Posted by Mr. Peabody
Sorry Redeasysport didn't mean to hijack your thread
Now the answer to my launch question and your question is.....?
Race Director
Joined: Feb 2004
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Pretty ironic that this question came up today. I got the full tour today in a local torque converter remanufacturing facility. This place also builds full ballz out racing stuff. I got to see, feel and touch all internal parts inside my converter. Saw some really trick stuff also.
Race Director
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A torque converter is also a torque multiplier. It allows the engines torque to be multiplied before it goes thru the trans. It also cushions the shock to the driveline(to a point) compared to a stick. This is part of the reason why stick cars break more driveline parts than a comparable auto car. This is also why autos are so popular with dragracers.
Le Mans Master
Joined: Aug 2004
Posts: 5,141
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From: Metairie Louisiana
torque converter
This may not be the answer your looking for, as far as how to launch your vette. but.. Check out the links below. How stuff works or ask jeeves are usually good sources for learning about basic auto technology.
http://auto.howstuffworks.com/torque-converter.htm
http://www.familycar.com/transmissio...ue%20Converter
http://www.ecanfix.com/users/atdsm/faq_torque03.htm
http://www.bankspower.com/Tech_under...rqueconver.cfm
http://auto.howstuffworks.com/torque-converter.htm
http://www.familycar.com/transmissio...ue%20Converter
http://www.ecanfix.com/users/atdsm/faq_torque03.htm
http://www.bankspower.com/Tech_under...rqueconver.cfm
Race Director
Joined: Feb 2004
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Originally Posted by Redeasysport
So Pete what is the best way to launch with a higher stall converter just floor it or power brake?