what is a mod for low end power?

[*K*night Rider]

gawd im glad i have a manual...this crap is confusing!

*K*

[99BlueSuperSix]

<blockquote>quote:</font><hr>Originally posted by AMinor65:

I'm sure that you already know, but on a v6, these aftermarket performance converters made for 350's (I'm old school :D ) stall about 9 percent lower on our cars. For example, a 3500 stall converter would probably stall around 3200 on our cars. Guys, correct me if I'm wrong.<hr></blockquote>

how does this make sense? does this mean that when we mod our cards for more tq then it raises the stall speed? No! The convertor stall is based strictly on engine speed, not hp/tq or displacement.

[John_D.]

<blockquote>quote:</font><hr>Originally posted by 99BlueSuperSix:
how does this make sense? does this mean that when we mod our cards for more tq then it raises the stall speed? No! The convertor stall is based strictly on engine speed, not hp/tq or displacement.<hr></blockquote>

Not exactly true.

Since the converter is still a fluid coupling, if you throw another 100hp at it, you can get it to turn a little faster, and the drive wheels still won't be turning over.

Theoretically you could probably throw enough hp at it to make it turn 10,000 rpms. Practically speaking though, there is some upper limit to this, since at some point the converter will die and/or the fluid will overheat and/or the rear brakes will no longer hold...

And likewise, if you throw 100 less hp at it, it will turn a little slower. If you had only a 50hp engine, you would not be able to push the rpms up to the "rated" stall point. Whatever rpm point you could achieve would become the rated stall point for your power input level.

[AMinor65]

<blockquote>quote:</font><hr>Originally posted by 99BlueSuperSix:


how does this make sense? does this mean that when we mod our cards for more tq then it raises the stall speed? No! The convertor stall is based strictly on engine speed, not hp/tq or displacement.<hr></blockquote>

From Summit Racing(Abbreviated):

"Nothing about torque converters is more misunderstood than stall speed. For example, a converter with a 2,800 to 3,200 rpm rating might provide approximately 2,800 rpm of stall speed behind a mild small block V8, but about 5,000 rpm behind a big block making 800-plus ft.-lbs of torque. Without knowing how much torque your engine makes, you cannot know how much stall speed a converter is capable of."

I don't know a whole lot about torque converters, but I knew this. That why I posted...because I knew something.

[Ex-5.0]

<blockquote>quote:</font><hr> what do you mean the driving wheels? <hr></blockquote>

The rear wheels of the car.

To find out the stall speed:

1. Make sure nothing is in front of the car.
2. Put in drive
3. Press brake hard.
4. Press accelerator pedal to floor -- make sure that brakes are on hard enough so that the wheels don't spin.
5. Check tach for RPMs. The maximum RPM is the stall speed for that particular car/engine/torque converter.

Caution! Don't hold accelerator down for more than about a second or so or you will overheat the transmission. Also, this can break motor mounts on an older or high mileage car so be careful.