Turbo waste gate conversion to adjustable

[Mogman]

Mogman
I completed the adjustable conversion like yours. On my approx 1k mile 1152. It's better for opening but still opens some during regular flat driving at low speeds.
Have slowly been tightening it up. Now it's close to your pic. Question is do these wastegates normally open and close at lower speeds on flat surfaces.
Going to tighten up another 2 or 3 flats today.
Thx
Dave

I would suggest at least temporarily installing a boost gauge, I have never driven my truck with the doghouse off so I cannot advise on when it opens up.
You do not want to boost more than about 10-12 psi and on this turbo never over 13-14Psi, at about 15PSI it will surge and that can over speed the turbo and burn the bushings out.

 

[Dave2018]

I would suggest at least temporarily installing a boost gauge, I have never driven my truck with the doghouse off so I cannot advise on when it opens up.
You do not want to boost more than about 10-12 psi and on this turbo never over 13-14Psi, at about 15PSI it will surge and that can over speed the turbo and burn the bushings out.

When mine opens up you can tell right away. And when it closes shut it gets much quieter. Runs very nicely. My doghouse is always on.
I guess it's time for a boost gauge.

Dang...my low mile truck in more work than my 50k mile 998 for sure.
Thx
Dave

Thanks
Dave

 

[Mogman]

When mine opens up you can tell right away. And when it closes shut it gets much quieter. Runs very nicely. My doghouse is always on.
I guess it's time for a boost gauge.

Dang...my low mile truck in more work than my 50k mile 998 for sure.
Thx
Dave

Thanks
Dave

That does not sound right, I cannot hear my waste gate opening, are you sure you are not hearing the fan kick in and out?
EDIT, that would explain why you are hearing it under normal driving "flat" conditions, the waste gate only opens under heavy load.

 

[Dave2018]

That does not sound right, I cannot hear my waste gate opening, are you sure you are not hearing the fan kick in and out?
EDIT, that would explain why you are hearing it under normal driving "flat" conditions, the waste gate only opens under heavy load.

That sounds logical. I may sense a little power drop or could be nothing. The sound is very noticable. The fan on my 998 would be nothing compared to this sound.

Does yours have a loud fan noise. When the noise is off the truck is super quiet. With it on it isn't.

Maybe putting this kit in pic on tommorow. Hope the crossover will have top clearance to clear to remove.

Thx again.

 

[Mogman]

That sounds logical. I may sense a little power drop or could be nothing. The sound is very noticable. The fan on my 998 would be nothing compared to this sound.

Does yours have a loud fan noise. When the noise is off the truck is super quiet. With it on it isn't.

Maybe putting this kit in pic on tommorow. Hope the crossover will have top clearance to clear to remove.

Thx again.

The ECV (I assume that is what you have) has a lower gear ratio so the engine is running at a higher RPM for any given speed so I would expect it to make more noise.
My turbo diesel has a 6 speed 6L80 transmission with a double overdrive and the 2.56 gears so the fan is not very noticeable as I am only turning about 2250 RPM at 75 MPH

 

[Dave2018]

The ECV (I assume that is what you have) has a lower gear ratio so the engine is running at a higher RPM for any given speed so I would expect it to make more noise.
My turbo diesel has a 6 speed 6L80 transmission with a double overdrive and the 2.56 gears so the fan is not very noticeable as I am only turning about 2250 RPM at 75 MPH

Nice rpms for 75. Probably keep my stock 1152A1 about 65. Hitting about 2500 rmps at 55 or so.

 

[Pstyckiewicz]

Old post but figured someone might still be interested. I did the mogman special. But I couldn’t get the old unit out. Thus I just kept the waste gate in and modified it in the truck.

 

[rcamacho]

Old thread indeed I know.
Finally connected a boost gauge and validated I'm seeing 5-6PSI maximum on the stock waste gate. I have a turbo master adjustable unit on order just so I can easily revert to stock if needed. I'm planning on 10PSI to start, keeping below the danger range.

Did anyone adjust fueling on the DB2 pump in combination with the increased pressure?
How did EGT's look before/after etc?

 

[Pstyckiewicz]

I just added a cheap Bosch boost/vac gauge. It worked for a little before I kinked the cheap line. It was running in vac just a few revs in driveway before I realized the line was kinked. Just hooked it up with a copper line. I’ll be driving around town tomorrow and putting a load on it to see what I get for boost. I never hear the turbo so this will be an indication on what it is doing.

 

[Pstyckiewicz]

Welp it seem like I have no boost. It dips into vac when driving around and maybe generates 1 pound of boost climbing a hill. I also adjusted the waste gate. Hmmm

 

[rcamacho]

Welp it seem like I have no boost. It dips into vac when driving around and maybe generates 1 pound of boost climbing a hill. I also adjusted the waste gate. Hmmm

Bad turbo or perhaps clogged CAT. CAT failure is common on the turbo trucks from what I hear. Did you try disconnecting the exhaust before the CAT to test?

 

[Pstyckiewicz]

I’ll give that a try.