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  How to determine correct stall speed??

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Author Topic:   How to determine correct stall speed??
Jerry Piner
Gearhead

Posts: 224
From: staunton, va
Registered: Dec 2001

posted 11-26-2002 11:15 AM     Click Here to See the Profile for Jerry Piner     Edit/Delete Message   Reply w/Quote
I have heard several different ideas on this including 300-500 rpm over max torque, 300-500 rpm below max torque, and also 1500-2000 rpm below shift point.
Was just wondering what everone thought was the proper way to select stall speed.
I guess actually it would be flash speed since I am asking about footbrake cars.

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kid vishus
Gearhead

Posts: 6405
From: middle of NC
Registered: Oct 2000

posted 11-26-2002 11:19 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The best way is to call the reputable convertor builder of your choice, give them the car and motor specs, and let them decide what you need.

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Rustang
Gearhead

Posts: 805
From: Clarion PA
Registered: Nov 2000

posted 11-26-2002 12:10 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
Kid's right. And if you buy an off-the-shelf one from Summit or similar you'll end up sending it back to the mfg'r to adjust it.

Been there...done that...

------------------
'68 mustang 351 clevor- [email protected]
'67 Stang, 351W [email protected]
'69 351C [email protected]
'78 Pickup [email protected]
'79 Pickup 460 ET=??

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BlueMule
Gearhead

Posts: 1556
From: Kent Island, MD USA M&M # 2423
Registered: Sep 2002

posted 11-26-2002 12:19 PM     Click Here to See the Profile for BlueMule   Click Here to Email BlueMule     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by kid vishus:
The best way is to call the reputable convertor builder of your choice, give them the car and motor specs, and let them decide what you need.

Good info, thanks...
Does it apply to street applications also?

------------------
-Paul

70 Mach1
79 Ranchero GT
97 Expedition XLT
00 SVT f150 Lightning 4149 of 4966 Born on: 06/26/2000

'life's tough... it's tougher if you're stupid.'

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Moneymaker
Administrator

Posts: 26813
From: Lyons, IL, USA
Registered: May 99

posted 11-26-2002 01:00 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes Paul. You should always purchase a converter direct from the manufacturer if possible. If you buy used, then try to buy one that is only second hand and was used only by the seller.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

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jsracingbbf
Gearhead

Posts: 2904
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 11-26-2002 10:30 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
If you do buy a used one, factor in the cost of sending it in to be "freshened" up. If the guy is asking near new price for a used one, I wouldn't do it. I bought a used 8" for a spare to keep in my trailer, but I bought it at half the cost of new. I sent it back to the manufacturer to make it just like the one in my car.

------------------
Jerry Smith
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
"Long ago when men cursed and beat the ground with sticks, it was
called witchcraft.....Today, it's called golf."

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 11-26-2002 10:59 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Jerry,

The funny thing about stall speed is that it varies depending on what rpm your engine makes its torque at, how heavy your car is and even by your gear ratio. So it isn't like you can order a 3500 stall converter and it'll stall at 3500 behind a big block or a stock 289, a 4500 pound car or a 1500 rail. The manufacturer will want to know everything about your combo, and if you have a dyno sheet it'll be even better so he doesn't have to guess at where your max torque is.

For a street car the stall speed is a compromise anyway. Like everything else about a street car performance is lost to gain streetability. A street converter that stalls a few hundred above stock like a "street fighter" might be ok, but it will not acheive the best 1/4 mile times.

SteveW

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jsracingbbf
Gearhead

Posts: 2904
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 11-26-2002 11:10 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Very True Steve, but the guy I sent the used convertor to, made the first one, so he knew my set-up. I gave him all the info when he built the first one. Sorry, I forgot to mention that.
He is the best there is, Kenny Ford at PTC. Even his name is correct.

------------------
Jerry Smith
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
"Long ago when men cursed and beat the ground with sticks, it was
called witchcraft.....Today, it's called golf."

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kid vishus
Gearhead

Posts: 6405
From: middle of NC
Registered: Oct 2000

posted 11-26-2002 11:14 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Too many "Jerry's" in this thread. I think it got confusing.

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jsracingbbf
Gearhead

Posts: 2904
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 11-26-2002 11:37 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
OPPS I think I got confussed too! AM I ME? OMG
Jerry, Listen to Steve an Alex, I'm having an identity crisis.
Sorry Steve
Thanks KV for letting me know hey it could be worse, We could both be "sybil"
the other Jerry

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 11-27-2002 12:03 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Yeah,

I was talking to your other brother Jerry. LOL
Nothing but good advice on this whole thread!

SteveW

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