You can have a low stall converter w/a turbo, but if you have too big of a turbine housings A/R , then it will have turbo lag, meaning you will not see boost until you have enough exhaust flow to spool up the turbo later in the engine upper RPM range.
Or by having too large of a turbine wheel, (heavy) too large of as compressor wheel, a lot a variables to consider for sure.
Camshaft having too much overlap. Low compression, incorrect timing, etc, etc, too large of volume intake manifold, runners too big, header tubing too large.
My Syclone has a stock torque converter w/a known brake stall of 2100 RPM.
When stock, when you floored it, there would be turbo lag until about 2400 RPM, then it would see a couple PSI of boost pressure. Full boost (14.5 PSI) by about 2800-3000 RPM
But, you can also hold the brakes, give it throttle & boost launch it, so when the RPM's would go to 2100 PRM, you can see the boost creeping up, hold the brakes long enough, then you could launch @ 15-20 PSI of boost pressure w/out even moving yet, release the brake pedal, BAMM! boost launching an AWD truck @ 15-20 PSI, & cutting 1.6- 1.7 second 60 ft times w/standard radial tires, is a pretty good feeling for a stock 3600 + lb pick-up truck.
Depending on a turbos engine combination, you can have turbo that can see boost pressure at 1500 RPM, but will be severely choked up on the exhaust side from too small a turbine wheel & turbine housing.
If you want a torque converter w/a lockup feature, I would consider using a different transmission.
I personally like the gear spacing on a 200R4 trans, it will make your car quicker, has a OD 4th gear usually = better mileage & it is a direct replacement, meaning, you do not need a different driveshaft made, or cross member, you do need to have a bracket as to use the TV cable. Probably need to get a Holley linkage kit for the 700r4/2004r TV cable.
If you do not plan on making any serious high HP/torque 250 6 cylinder, this would be a good option for you.
The 200R4 can be built up to take more HP/torque, but it will cost you money.
The 200R4 trans were used on all Buick Grand Nationals & Turbo T-Types & those put out about 300 HP stock to the wheels.
Those trans used in those cars were the better ones to use stock for stock, but they had the B.O.P. engine bolt patterns. So you would need one that have a Chevy bolt pattern housing.
A member here (TheSilverBuick) has a 200R4 in his Firebird, so he knows how the 200R4 works on a inline 6.
MBHD
