jesussaves

Hello I have a 4in ex, steed speed turbo manifold, he 351, 5X14 inj, & 3.73 gears, fuel pin what would everyone recommend as a good stall speed for me?

its a daily driver/ tow vehicle for 36 ft trailer?
thanks
todd

BC847

Stall speed is relative to the engine in front of the converter (that being predominantly the torque input at a given engine RPM combined with a given load at a given output RPM). With that, it's really hard to put a number to the stall without knowing a lot more info.

Not too many years ago, many of the diesel torque convert folks would describe a given modified converter as being "89%" and "92%" with the assumption the stock/OEM unit was about 60% (% efficient fluid coupling). Putting those two converters behind the same 5.9ltr Cummins, with a gazillion different tunes, had folks getting a world of different actual stall speeds. That had a bunch of folks calling the makers and complaining that their results were very different than what the makers had hinted at. As such, the makers got tired of having to explain to folks why their results were different than a phone call could come up with, so they quit listing them as 89 and 92%.

What RPM options is the torque converter guy offering?

jesussaves

he said factory is 1400 but can take it down to 1100

johnh

if i remember right, stall speed is the engine rpm when you put the trans in drive with one foot on the brake and the other on the throttle to the floor......it is determined by engine tune, poor tuning =low stall speed.......slipping trans=high stall speed.also the type of converter,
typically a diesel converter will have a lower stall speed than one with a gas engine

BC847

I personally wouldn't go too far with it being a work truck in your application. As I understand it, tightening the converter cuts into the torque multiplication ability.

Crossy's son

i think stock is 2100 nowhere near 1400.

Goerend sells their non lock converters at 300 rpm lowe
500 rpm lower
and 800 rpm lower for race application

JD730

Yup, too tight and you won't be able to get the engine rpm's up enough to get the truck and trailer to move.

dieselJon

I would go tight. You have nice gearing in the rear, a quick spooling turbo, and bigger injectors. Towing would improve with the tighter converter as the turbo would spool before the EGTs would get too hot.

Just my $.02 worth.