Pushing big turbos

My truck has been running great and flawless. All of the bugs have been worked out for over 20,000. Im very satisfied with the tuning I have made and I want to push it a little more. However I believe there is more left in my big charger. Having 4:30 gears presents a problem with loading the turbo. I have made many adjustments to the backpressure, vane control and in the smoke control tables as well as the transmission. I guess my question is how much can we push the backpressure to gate it into the lp turbo? Also how much is to much?

This truck has Tow-X turbos gated between the stages. 8 hole injectors but stock flow. Its making up to 41psi and I know others are pushing 50 plus with high powers.

Rivets are the new duct tape.

I assume the 8-holes are Elite. So you are running stock lift pump, have the fuel bowl, and stock HPFP? What size are the injectors? Do maintain RP with them?

Elite. Stock flow. It may make no difference but I thought I would add it. It also has a elite manifold.

Rivets are the new duct tape.

have you verified that your rail pressure is 24k?

What pulse width are you running?

Rail pressure has been fine. Im running up to 2.1 ms

Rivets are the new duct tape.

I really dont think this is a mechanical problem. I think its in the tuning and setting the gate to match it.

Rivets are the new duct tape.

just trying to make sure we have covered all bases before we start changing a bunch of stuff.


Where is your gate? Between stages?

What i would try is closing the vane minimum to 10%, see what your back pressure and boost do, you might need to play with the gate.

Correct. Between the stages. Explain where I change the minimums. I have raised the maximums tonight but haven't tested it.

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under "turbo"
"values"

"minimum duty cycle limit for vgt"

Change that from 2% to 10%

Be carefull when making these changes that you dont let your back pressure climb too fast. Gate changes might need to be made, and 5% is a decent jump

Thanks. I will test it tomorrow with 5% and go from there. I need your kit on the big Turbo to see what its doing. Any chance for the H&S?

Rivets are the new duct tape.

Should net some big gains will, just watch Bp closely.

No I can't add it to h&s

Just get a mechanical gauge for testing once it's set don't worry