[f100cleveland]

I finally got around to putting my ET Street Radials on and checked out my JPT convertor I put in over the winter. I can brake stall it to about 3500 rpms but it won't flash over 3500 rpms either(is supposed to go to about 4000-4200 rpms). I always thought that the flash stall would be a fair amount higher than the brake stall. But maybe I'm wrong or missing something? Any help is appreciated.

 

[FEandGoingBroke]

I have no idea what you're talking about....

Someone please help this guy!

 

[f100cleveland]

FE, ok, let me try to rephrase this. The custom JPT converter is supposed to have a flash stall of about 4000 rpms or so. So, if I am not moving and stand on it, it should reach somewhere around 4000 rpms, but it only hits about 3500-3600 rpms before it launches. Now, when people refer to brake stall speed of a converter, it is the highest you can rev your engine while holding the brakes until the tire start to spin or vehicle starts to move. Well, with the ET Streets on, I can hold the tires back from spinning until about 3500 rpms. So, my brake stall speed and flash stall are basically the same. Maybe the sticky tires have something to do with it, but I always thought that a converter will flash stall at least a few hundred rpms higher than it will brake stall. I was asking if it sounds right that my stall speeds are so close to each other.

Hope that clarifies things.

_________________
1982 F100 - 357c w/ stuffed 4v's and Funnelweb. C-6 trans, Gear Vendors o.d. and 4.86 geared Detroit Locker 9" rear. http://www.supermotors.org/registry/vehicles/detail.php?id=6723

<font size=-1>[ This Message was edited by: f100cleveland on 5/17/06 11:35am ]</font>

 

[82GT]

What's the rest of your setup? There are a lot of factors that affect stall speed such as weight, gears, tires, cam....lots of stuff

 

[f100cleveland]

Engine is a 351c 4v with ported closed chamber heads with Parker Port Stuffers, Funnelweb intake, 950HP carb, 242/[email protected] 0.640" lift solid roller cam.
C6 trans, GV overdrive, 4.86 gears, street tires are 275/60r15 and the drag tires are 325/50r15 ET Street Radials.
Anything else you want to know?

EDIT: Forgot the weight. The truck weighs about 4200 pounds with me in it.

_________________
1982 F100 - 357c w/ stuffed 4v's and Funnelweb. C-6 trans, Gear Vendors o.d. and 4.86 geared Detroit Locker 9" rear. http://www.supermotors.org/registry/vehicles/detail.php?id=6723

<font size=-1>[ This Message was edited by: f100cleveland on 5/17/06 12:18pm ]</font>

 

[forthman]

Is torque of the motor that determines stall of a given converter.
Given your cam and motor maybe you do not make enough torque to stall the conveter higher?
The clevelands i have seen just start making good power about 4500

 

[igo1090]

how are u finding the flash stall? stop on the return road, put it in high gear, hit the gas and watch to see where the tach goes to? assuming u have a manual shift valve body.

 

[MarauderMan]

Stall ratings are relative to engine torque, vehicle mass and several other factors.

The manufacturer should have given you or should be able to supply data for which your convertor was rated.

A 3000 rpm convertor might not make it to 2000 behind a weak motor; a 514 might hit it so hard it never locks up.

Call write or email your manufacturer.

IMO, your cam and ports are so big, I'm surprised it stalled as high as it did, but it sounds like a baddass combo.

Good luck!

 

[pedal2themetal45]

I thought the stall speed was the highest rpm it would reach while not turnning the wheels.. not when the wheels start to spin that just your brakes not holding the wheels.. If you could hold the wheels so they don't spin at all and give it gas and watch your tach I think stall is where the rpm's stop climbing while contenuing to incress the gas.
yes, no, sort of ?
Tim

 

[FEandGoingBroke]

What tim said is what I had thoughts on... Flash stall is a mystery to me... I like standards more than auto's anyway...

 

[82GT]

Flash speed is the speed the engine immediatly "flashes" to at the hit of the throttle. Cruise in high gear and then nail the throttle and watch where your tach "flashes" to before it comes back down. It will happen quick so you have to pay attention closely.
When I ordered my Edge converter, I gave them specific details about my engine combo and what stall speed I was looking for and they built me a custom converter. That how they build all their converters. You just don't get a converter "off the shelf" and expect it to stall at the rated stall speed on the box. It doesn't work that way.

 

[ckelly]

You can ONLY check the stall on the car with a trans brake. Flash stall is close or should be. Brake stall means nothing, just that you have brakes. If it flahses to 3500, then it's tighter than they specificed and they should fix it - IF you ordered it specifically for the existing combination.