Closing turbo vanes for turbo braking?

[Haulinbass02]

Is this something that can be set in EFI live say like an always on Jake brake? I know that Banks and Fleece performance have made a turbo brake and boost controller but I was wanting to do something a little more simple (and cheaper) which would be to have the turbo vanes closed at 0% throttle or maybe 1-2% throttle. Anyone done this and how did it work out?
In my mind it would probably be best when a DSP switch comes out for the LBZ that way I can have two replica tunes, one with the "turbo brake" and one without that way I can turn it on and off whenever I need or don't need it.

[the4wheeler]

yes can be done very ssimpley

vane possion in the first 2 rows 0 and 5 mm3 i think it is and from 0 to about 1800rpm
is the airia where i set to 90% ( i am trying to rember its been a while since i built my tune)
your are also gona want to add to the boost tables in the same airias

from what i rember thats the base of things some one jump in if i forgot soemthing

over on Diesel place in the tune library theirs a tune that has turbo braking if i rember its labeld

i used that as my base
my self i wanted it to come in sooner and last a little longer so i jsut added some to it

works friking grate! defenetly helps out
one draw back to my settings i have is on center hills going down that are not that steep it will bounce on and off off of the turbo brake jsut annoying to have the turbo cycling ever 2 secconds
can fix it by pulling out of the 5 mm3 row if you dont like it

i run mine on all tunes all the time jsut because its so nice to have for every day driving

[killerbee]

This is why vane position should be one of the dsp tables. It wastes a lot of fuel when you don't want it.

[the4wheeler]

It wastes a lot of fuel when you don't want it.

???? how is it wasteing fuel? just ciriouse on your thoughts.

[killerbee]

Energy management

grade braking with a load is a good thing, but lacking a load, you can't coast to conserve energy. Kinetic Energy is always being consumed/reduced to brake the vehicle.

Hypermilers could explain better than I. You can literally plan stops with this vehicle 1/2 mile away, due to its 8000 lb kinetic momentum. That is potentially 1/2 mile with no fuel used. If the truck brakes every time you lift the throttle, you sacrifice this.

[abkimble]

Energy management

grade braking with a load is a good thing, but lacking a load, you can't coast to conserve energy. Kinetic Energy is always being consumed/reduced to brake the vehicle.

Hypermilers could explain better than I. You can literally plan stops with this vehicle 1/2 mile away, due to its 8000 lb kinetic momentum. That is potentially 1/2 mile with no fuel used. If the truck brakes every time you lift the throttle, you sacrifice this.

Use it to generate some electric.

[the4wheeler]

i think i git where your coming from makes since

i should mension above that im running a ZF not a Allison im able to down shif to take better advantages of the rpm and the boost that is built up when braking so i cant say how the Allison behaves unless you can tune it to downshift after say 2 secconds of 0 throttle the same way a 5500 will downshift when you have the factory turbo brake switch engaged.

[Brian1]

Do you set it to 90 percent on both lines from 0 to 1800 on all turbo vane position tables under boost?

Brian

[killerbee]

Do you set it to 90 percent on both lines from 0 to 1800 on all turbo vane position tables under boost?

Brian

set it to vane maximum to 100% for the first two lines to 4000 rpm. Also, you need to change boost to 10 or 15 psi so that vanes will close (they need to produce boost)

[bballer182]

set it to vane maximum to 100% for the first two lines to 4000 rpm. Also, you need to change boost to 10 or 15 psi so that vanes will close (they need to produce boost)

Actually you don't have to do that... B2231 and B2232 take care of that.