I was sitting at a stop light earlier tonight and remembered a thread a while back talking about stall speed and such and decided to see what my stock converter would brake stall up too.....and I was very surprised to see the tach steady at 2500rpms.
Is this normal? seems a little high for stock to me, but I'm not complaining.
I repeated this 4x just to make sure it was accurate, 2500rpms all 4x.
I wonder if it would stall higher if I was in tow/haul mode?

 

Hmm, well you've got an 80, plus a 6.0 that makes torque down low, so I don't know, maybe that's normal. I know that I can only brake stall to 1500 with a 5.3 and a Radix. What do you flash stall at?

 

I was in 2wd and had the gas pedal all the way to the floor.

someone explain flash stall again?

 

Stall FAQ's

 

got it! the initial rpm the engine jumps too off the line when floored.

I don't remember ever checking that, on the way to the base in the morning I'll check it and report upon arrival.

 

 

OK, I floored it of the line 4x this morning from a dead stop, flash stall was 2300-2500rpm.

after I mashed the gas pedal, the rpms jumped to 2300 or 2400 rpms, settled at 2500 rpms, then started climbing. Every run the tach needle would initially rise to 2500rpms, stay there for a second(or less) then continue up the rpm scale.

 

I get about 1,800 out of my truck. I might get more, but some of the tires either start to break loose, or skid.

 

I'm thinking this is kind of sweet.
and I'm wondering what benefit a yank HD2600 stall would have over my stock converter.

 

Good question....depends on what HP/TQ/Weight the TT2600 is rated for.

From what little I know and have learned about TC's, the numbers are based on certain vehicle weight, HP output, and TQ output. For example, the Yank TT2600 might reference a 2004 Extended Cab, Short Bed, 2WD, 5.3L-equipped, otherwise stock Silverado when establishing their numbers (don't know but possible). So we're looking at 295HP/330TQ @ 4563 lbs curb weight. The only vehicles in which the TT2600 will stall at 2600 RPM's are vehicles with those or similar characteristic.

Start playing with any of those three variables, and you will have deviation from that stall behavior. Same weight with same HP and less TQ (i.e. 4.8L)? Lower stall speed. Same weight with more HP/TQ? Higher stall speed. I think Ben over at the Silverado site had a Yank TT2600 that was stalling at 3000 RPM's or greater in his Radix-blown SS.

I agree moregrip that your converter stall behavior is nice...wish I had the same behavior in my truck!