nz12's

iTrader: (4)

Have any of you heard of "blowing through a stall" i.e. slipping. Is it possible for a stall to "slip". I know if it unlocks it will jump 2-3 hundred rpm's. But can it "slip" and cause rpms to spike??

Deerhunter-Z28

I'm not a tranny expert, but the answer to your question is YES it can slip or "blow through".

cals400ex

iTrader: (27)

yes it can. i have not had any personal experience with it but it seems to happen if you overstall your car.

built408

iTrader: (10)

All converters "slip" thats how they multiply the torque. Yes if you overstall the car you can blow thru it, usually they will just flash to the limiter or very close.

nz12's

iTrader: (4)

Didn't hear from any tranny builders! Someone that knows coverters, what's the answer and how does it happen, if it does????

Vortech Converters

Your actually not blowing thru the converter, or blowing over the converter, your just not going thru what is called the coupling phase (or in other terms "locking up" << Not talking about the lock-up clutch ).

In general, the coupling phase of any converter starts about 1700-2000 rpm's above the "SET" stall speed.

For example: Set stall speed at 5000 rpm's, The coupling phase wouldn't start until approx 6700 rpm's, Now the customer shifts at 6500. The tach would never fall back on a shift, it will stay pinned at the higher rpms, and the customer complaint would be: Blowing thru or over the converter.

When in reality the customer just needs to spin the engine faster or get the converter stall speed brought down to where it really needs to be.

This is a simplified version, the math model for fluid flow thru a vortex is crazy!!!!


Mike.

nz12's

iTrader: (4)

thanks

FTICONVERTERS

iTrader: (3)

"Blowing through the stall"
This happens when a converter is not matched to a particular engine combination such as an 8" converter behind a 706 C.I. motor. The converter will constantly slip and will not meet peak efficiency of 8% or less. Basically, a converter too small or stall too high for you engine, weight, gear combination. In simple terms making more power than the converter was designed to work with. With this being said a converter rated at 5500 stall behind a 355 C.I. motor with 500HP. When placed behind 540 C.I. making 900HP will stall 6800. This is providing the converter is in good working order. I hope this helps answer your questions. If you need further explanation please feel free to give us a call toll free 1-866-726-8358.
Thanks,
Greg
FTI COMPETITION CONVERTERS, LLC

elky489

iTrader: (1)

No Jay you worded it wrong,its blowing threw the lockup.Or high gear is just flat slipping.

elky489

iTrader: (1)

Just logged it and did some pulls.Has low pressure.Goes right threw 2nd gear.