No boost

[BadTy]

Hi guys

Have a boost problem on a customers ty. It takes an ultimate, 3bar MAP, 20G.
But it blowes not more than 15-17 PSI on T122. On T324 not more than 18 PSI
I changed plugs, wires, boost solenoid, wastegate, new turbo and a lot of other things. No knocking (O2 mV always over 900).
Someone has an idea what happens?

 

[bezerk]

Re: No boost

Hi guys

Have a boost problem on a customers ty. It takes an ultimate, 3bar MAP, 20G.
But it blowes not more than 15-17 PSI on T122. On T324 not more than 18 PSI
I changed plugs, wires, boost solenoid, wastegate, new turbo and a lot of other things. No knocking (O2 mV always over 900).
Someone has an idea what happens?

have you aslo replaced the wastegate?
you could have a leaking wastegate

 

[jwaller]

Re: No boost

the wastegate isn't tight enough. try shortening the wg rod. does the truck have a emission's converter? if so it could be clogged.

 

[SeattleSy#1255]

Re: No boost

Yet again another sticky WG perhaps...stock WG sucks...get an external and be done with it.

 

[BadTy]

Re: No boost

I replaced it yesterday already. But nothing changes. I removed the vaccum line to the wg. w/o it would be possible more than 25 psi.

 

[BadTy]

Re: No boost

the wastegate isn't tight enough. try shortening the wg rod. does the truck have a emission's converter? if so it could be clogged.

John, whats an emissions converter?

 

[SeattleSy#1255]

Re: No boost

John, whats an emissions converter?

your cat.

 

[BadTy]

Re: No boost

I replaced today the cat. No change

 

[93ty475]

Re: No boost

Like john said, it's probably the wastegate rod that's too loose....Don't tighten it up too much, just a full turn at a time until you get your boost calibrated with the ultimate's boost control....one good sign is that the boost went up when you selected a higher boost setting on the ultimate...Be vary careful running 25 psi unless you running 100% c16 fuel or a bunch of methanol....you can do bad things to the motor at those boost levels without knowing it....also make sure your knock sensor is functioning correctly with the tapping tests.....If you want to throw a few more parts at it, replace the wastegate actuator and most importantly the vacuum lines around the turbo.....

 

[BadTy]

Re: No boost

The wg actuator + solenoid + knock sensor are brand new. Also all vaccum lines.
Today I realized that some times the boost comes over 20 psi.
I will check the wg rod tomorrow.

 

[BadTy]

Re: No boost

I shortened the wg rod today. Each every full turn I incrased fuel pressure and I made some test runs with datamaster. After 3 full turns I stopped. My boost runs on T122 paralell up to 19 psi. After reach this mark it begins to sink up to 17 psi. I changed the 3bar map. My boost comes now over 21 psi but I have same symptoms on WOT: Briefly 21 psi boost, following falling down boost up to 17-18 psi.

Briefly 3° spark retard. Rich O2. brandnew boost solenoid, brandnew wg actuator. completly new vaccum system, brand new 20G, new wires, plugs, cap rotor, map sensor.
Never had a problem like this! any input?

 

[dgoodhue]

Re: No boost

When you are adjusting your wastegate rod and have it disconnected, do you have to pull the wastegate rod over the pin or do you have to move the wastegate arm to align with the hole in the rod.

 

[BadTy]

Re: No boost

I have to pull the wastegate rod over the pin. W/o moving the arm. The folds is closed.

 

[SeattleSy#1255]

Re: No boost

the entire stock WG system sucks. To get solid boost control, use an external and boost contoller or valve. An external will likely solve all thse problems. The stock WG just isn't size properly.

 

[BadTy]

Re: No boost

the entire stock WG system sucks. To get solid boost control, use an external and boost contoller or valve. An external will likely solve all thse problems. The stock WG just isn't size properly.

Yes I know, but its not my truck. And my customer cant spent so much money