Torque wars continue in the diesels

ShinerBock wrote:

LMMNOCATS_EFI wrote:
I’m making numbers that would eat this truck alive towing the same weight (I’d be over on the pin lol but I’d win lol anyway) also on a stock trans at its limits and the rest all has 377k and ticking but the TC issue is somthin that can’t be messed with with efi? Mine locks up but it seems to be if I switch to a higher tune from the next that it’ll stay locked but yeah you will notice it switch from what I have tunes 1-5 . It makes a big difference now can only imagine how it’ll be with new lift pump ??it’s nice to be able to pull pass semis that can’t be built as well while towing a large load

Yes, the TC lockup strategy on the 68RFE can be manipulated as it is with my tune. However, when I talk about TC inefficiency, I am talking about when it isn't locked.

Let me paint a scenario for you. Say you are making a slow turn to go up a hill. As you make the turn your truck remains in 3rd gear with the TC unlocked. As you start up the hill you press the throttle bot all your engine does is wail away at high rpms, but doesn't seem to be going anywhere fast. As you gain speed your rpms will start to drop as your TC starts to couple and eventually lock up giving you a rush of torque to power up the hill.

The point at which the TC isn't locked and your just spinning uncoupled at high rpms not going anywhere fast is what I am talking about when I say that the stock TC is inefficient since it has a high stall speed(which I assume is to protect the trans). This not an issue for an aftermarket TC with a lower stall speed. There is not wailing away at high rpms waiting for the torque converter to lock since it is more efficient at giving more of the engine power even when not locked.

This is one of the major reasoned why I believe the Aisin is so slow off the line(aside from torque management) as well from dead stop. The torque converter is not that efficient and is just wasting most of the engines power as it spins at high rpms.

Best way I can explain it is this video. If you watch at 1:20 of the video when he drives their shop truck, you will notice how much more power was sent to the wheels even when the TC wasn't locked. Trust me, it is night and day on how much power is sent to the wheels when unlocked versus the stocker.

How I RUINED My Diesel's Transmission... Don't Ever Try This!