Hi,
Im now at the stage where I want to fit the TH400 I have to my car. Problem I have is I need a converter to handle the power. Which company is best for selecting me the right stall I need, with the info I give them about my setup?
Cheers
Neil

 

I'm in a lazy mood so I copy and pasted from another post I did few weeks back.

All converters aren't created equal. They can be different physical sizes (rotating weight and multipliers), flash speeds, and internals (anti-balloning plates, non-lockup, lockup).

The cheaper converters are just advertised RPM, which can differ depending on the torque output of the motor, because they're just pulled off a shelf and handed out. More expensive ones normally are custom spec'd to your build and sometimes even give you an option to send it back again to get it changed to a different flash speed.

They also make lockup and non-lockup converters. Lockup converter needs to be used with a lockup style transmission to function but it reduces the slip of the converter at higher speeds such as highway use. That basically keeps the converter from flashing when you drive down the highway and step into the gas a little. It should unlock the converter if the brake is used, lots of throttle used, and etc to prevent the motor from stumbling. At least that's how my custom soldered wiring is setup.

You of course need to match the Converter to rear ratio, motor, and purpose for the car. The big dollar companies like Precision Industries (Vigilante Converters) or similiar all take down you specs when you buy from them. Such as Motor Size, Power, Camshaft specs, Rear Ratio, Purpose of the car, etc. That way they can configure the converter to the Flash RPM to match your setup.

If your throwing down some power look for a 9.5" or smaller converter.

 

Call Hughes. Tell them what you've got, what you want and they'll set you up with the right converter. They're a VERY good company to deal with.

 

To properly spec a converter, get the engine on a dyno and give the dyno sheet to the converter manufacturer.

For a ball park stall speed, you want the stall speed to be about 500 rpm into the cam's powerband for street or street/strip and about 1000 rpm into the cam's powerband for full race. The cam grind will determine the stall speed required for best performance.