Converter Slippage 20-25% - Time to go to a non lock up? PL file.

[Dusty Bradford]

A converter is sensitive to fluid flow and pressure. Your trans is probably fine. The fluid flow and pressure into and out of a converter will change it's stall speed. It doesn't mean anything is wrong with your trans, it simply means the converter needs an adjustment to make it stall to the intended rpm it was designed for. Your 10" will never be as efficient as the 9.5 non lock without giving up a good bit of stall rpm. I can make it efficient but it's gonna be more difficult to spool. The flash rpm is the rpm your converter drops to on the gear change. This rpm should change as power is increased or decreased. Raising the boost 5 psi can increase flash stall because your applying more torque to the converter. This is why a turbo converter doesn't really have a stall speed. As you apply boost, the engine makes more torque and this increases the stall speed.

 

[Justa6MB]

Ok thanks a lot for the info - that's much clearer. Decision time.

 

[jasjamz]

My issue...

 

[Dusty Bradford]

It's too loose. You can see the rpm increase as the boost increases and it lays there.

 

[jasjamz]

Yeah, its coming out soon. How much can a car gain getting this resolved. Is .5 possible?

 

[bison]

Yeah, its coming out soon. How much can a car gain getting this resolved. Is .5 possible?

Fixing this might load the engine harder earlier and result in higher boost levels. .5 gain would be a rare thing unless the engine was floating the valves bad. .2-.3 would be considered a reasonable expectation but with the better coupling it might allow you to run a smaller cam/turbo combo up to a second faster.

 

[Dusty Bradford]

Bison is right. I'd expect .2 but more is possible depending on what the combo as a whole wants.

 

[jasjamz]

Thanks Gents!