LBZ: Table # 1128

[Huntinducks82]

Maximum torque levels based on barometric pressure.

Can someone explain this to me and how its used in tunin.
Thanks Brian

 

[The Neens]

Baro psi will drop as altitude increases...At sea level it's 14.7...I've never heard of anyone logging that table, but it reads that it's just another torque limiting table...With a stock transmission and stock shift points, it's probably best to leave it alone...With a built unit or modded shift points, adjustments can be made...

 

[Huntinducks82]

Okay thanks neens.

 

[JoshH]

I always max it out. I see no reason to leave it stock. Here's an interesting thing to note: the max torque reference never changes as baro goes up or down.

 

[McRat]

I guess I should test that. I think I did, but I don't remember. Basically set it at 200 max and see if it goes down the road.

 

[The Neens]

With a stock transmission and stock shift points, it's probably best to leave it alone...With a built unit or modded shift points, adjustments can be made...

I always max it out. I see no reason to leave it stock. Here's an interesting thing to note: the max torque reference never changes as baro goes up or down.

It has similar values to B1115...I didn't max out either of those tables when my transmission was stock, but was still able to burn clutches...I suppose you could mod certain tables as long as there was still some torque limiting in your tune...

 

[JoshH]

I guess I should test that. I think I did, but I don't remember. Basically set it at 200 max and see if it goes down the road.

It does work. That table on my stock tune is way different than an LBZ, and it was making it difficult to fuel right.

It has similar values to B1115...I didn't max out either of those tables when my transmission was stock, but was still able to burn clutches...I suppose you could mod certain tables as long as there was still some torque limiting in your tune...

I guess it's just differences in tuning style, but I don't see how limiting your torque reference number at a given RPM will benefit anything.

 

[The Neens]

It does work. That table on my stock tune is way different than an LBZ, and it was making it difficult to fuel right.

I'm ASSuming your truck is a LLY???...I don't have a stock tune on my PC to look at...

I guess it's just differences in tuning style, but I don't see how limiting your torque reference number at a given RPM will benefit anything.

Not sure I'm understanding you...Maybe cause I don't know what looks at B1128 for reference...

Wait, doesn't B1102 use torque reference? Or am I a little sloooooooooooooooooow today?

 

[Huntinducks82]

I guess I should test that. I think I did, but I don't remember. Basically set it at 200 max and see if it goes down the road.

Maximum on my 1128 is 2000. Are we talkin about the same chart. Also mine highest to is at 1600 rpm with the baro at 900. Then when it get to 4000 rpm the baro is 600. Thats why i was wonderin about it. My stock tune is the same why.

 

[McRat]

No, you set it at 200 max and test. If the truck goes really slow, it does something.

 

[Huntinducks82]

Now i see what you are sayin

 

[The Neens]

The max value in B1128 is 1476 ft.-lbs.

 

[JoshH]

Yes, I have an 06 LLY. The table uses Baro for the Y-axis and RPM for the X-axis and has torque reference limiting numbers as the data in the table, but the data in the table doesn't change along the Y-axis so it acts as a torque limiting to RPM table.

And it DOES work. I've seen how it limits torque reference numbers on my truck.

 

[The Neens]

I always max it out. I see no reason to leave it stock.

it acts as a torque limiting to RPM table.

And it DOES work. I've seen how it limits torque reference numbers on my truck.

You're WAY better at explaining things than I am...That's why I suggested not modifying it for stock trans/stock shift point applications...