Hi everybody.

As a little Frenchie, I still don't understand what Stall speed means...
I'll have to buy a new trans soon for my car, the current one is living its lasts moments.

I'm interested by a TCI Sizzler 30-spline TH-700 R4 to replace the factory unit on my 83 T/A. Tough I plan to prepare my ex-CFI 305ci with a Edelbrock Performer idle-5500rpm kit, and (maybe) alloy heads, I believe the Sizzler is enough.

To match, I found several Sizzler 30-spline torque converters, but I have to choose a Stall Speed. And I don't know anything about that.

With a low-end power small V8, and a planned 3.43 auto-lock diff, what should I choose ?

I wanna race Porsche Boxters (why I choose a close-ratio axle and low-rev engine kit) but still want a driveable road car, not a head-shaker.

Can someone guide me ?

 

Any stall speed can be used but to get the best performance, a stall speed should match the camshaft.

A factory converter has a stall speed less than 1800 rpm. With the Performer cam, something in the 2000-2500 range will work best.

 

Thanks for answering. Does that mean my trans will spin till 2000rpm ? I want a quick-response trans, but relatively smooth shifting....

Thx

 

http://www.hardtail.com/techtips/torqueconverters.html

 

To give you an idea, I have a 2000 rpm stall converter. When I mash the gas (no brake), the engine will rise to 2000 rpm before the data log shows any vehicle speed "0 mph". This takes about 1 sec, then the mph climbs as the rpm does. At the 2 sec mark, the mph is 18, the rpm 2900. At the 3 sec mark 4175 rpm and 29 mph.

 

A higher stall means it allows the engine to get into it's powerband quicker. My converter stalls at 6000 but the car will still move with light throttle at 1500 rpm. I actually move into the staging lights at a 1000 rpm idle. The converter still works but it slips a lot more at the lower rpms.

At the track, I launch at 6000 rpm with a transbrake. When the rpms hit 7400, I shift and the rpm drops to 6400 then climbs back to 7400 where I cross the finish line. The 6000 stall keeps my engine in it's powerband while at WOT.