LB7's use a IHI RGH6 turbo. I think that the turbo's can spike/peak at somewhat higher, but not maintain that pressure if its expected to have a long life or not break anything. Don't have any intel for your other questeions, sorry :|

 

Perform a search on 550.5
That will give you a bit of insight on what to expect.
My junk turbos have been scrutinized.... yea, we can hang a bigger wheel from an HX50 on it to get the desired pressure ratio, but then there is too much inertia.... one bark could destroy it. And machining the existing case... 3 or 5 hundred thou for a slightly bigger wheel is not worth the $$$$ for the gain. 32PSIG@ ASL is fine.... go up 4 or 5000 feet and it is not.

Boost is a gauge relative to turbine outlet pressure and has NOTHING to do with the critical surge RPM of the turbo.... 32PSIG ASL=XXX,XXX RPM@WOT 32PSIG@ASL+5000'= FAILURE.

In essence you are correct. The wait for us all continues on the turbocharger front.
Garrett has a GT45 that looks promising on a compressor map, good pressure ratio, decent PSI and efficiency.... BUT you'll coat everything with soot until meaningful boost occurs in 3rd gear. Not real friendly for EPA Cheerleaders....To add insult to injury, you need to run enough fuel to spool it. Heat accounts for 75% of the energy transferred to the exhaust turbine.
Therefore in a circumstance of stock fuelling, your EGT's can be higher than stock while towing a trailer due to insufficient turbo output at the stock fuelling level until enough temperature and flow are present to spool it. (Steve Cole can correct me on that last statement i may be mistaken there)

550.5 thread here
http://dieselplace.com/forum/showthread.php?t=14835&highlight=550.5

 

If you tubos have been scrutinized then what did they say caused it to fail?

I should probably take out my modified waste gate line that came with the TST box and put the regular hose back on. I live about 5000 ft elevation.

 

If you tubos have been scrutinized then what did they say caused it to fail?

I should probably take out my modified waste gate line that came with the TST box and put the regular hose back on. I live about 5000 ft elevation.

When a turbo dies it is usually a pretty violent affair , damages so many precision tolerances that a definitive root cause is hard to determine. Having said that, 2 had thrust bearing failure (distortion fore and aft) causing the impeller blades to make contact and shatter. 1 had the compressor wheel explode.... that was the only damage.... #4 the thrust bearing had distorted, almost allowing the compressor stage to hit the housing. Turbo was replaced before the inevitable happened.... you could tell the turbo was on its way out... very loud 'spooling' sounds until 10 psi of boost... then it would sound normal.

 

30 would be a pretty safe #..... 32 might be pushing things. The safest bet would be a banks wastegate, and set it to 26 or 27 lbs of initial lift of the wastegate arm (using compressed air). I am ASL+3500' and run those settings currently and all is well.

 

Turbo kits are out there if you know the right people.

 

I know Santa Clause and he didn't bring me a turbo. I thought if anyone would, he would have the connections.

 

I know Santa Clause and he didn't bring me a turbo. I thought if anyone would, he would have the connections.

I'm Gonna Aim at Rudolph Next year Max.... Maybe all we need to do is splatter cherry pie on his favorite reindeer to get his attention.

Got the SXS 12 loaded with 00 SSteel Shot now.
):h :ro) ):h

RUDOLF'S GONNA GET IT SANTA.
GET ME THAT TURBO!

 

When a turbo dies it is usually a pretty violent affair , damages so many precision tolerances that a definitive root cause is hard to determine. Having said that, 2 had thrust bearing failure (distortion fore and aft) causing the impeller blades to make contact and shatter. 1 had the compressor wheel explode.... that was the only damage.... #4 the thrust bearing had distorted, almost allowing the compressor stage to hit the housing. Turbo was replaced before the inevitable happened.... you could tell the turbo was on its way out... very loud 'spooling' sounds until 10 psi of boost... then it would sound normal.

Juice you need to look at the clamp holding the two halves of the turbo together. It's possible under heat and stress that it allows some movement that could damage the shaft/thrust-bearings or possibly cause an intermittant bind. This was mentioned as a weakness in testing.

Only way to know for sure is to see if reinforcing the joint somehow yeilds less failures. How to do that I don't know. Heavier home made clamp?

 

turbo#3 was spectacular.
Center section was like new... Exhaust exducer and housing was fine... only the compressor wheel exploded!

I should have taken pics... totally cool

 

I know that on my turbo bike, a few times I had an intake backfire that would spin the two halves of the housing 45 deg. It didn't cause a failure of the bearings or impeller/turbine pieces.

Aren't the two halves mated on a machined dia that keeps them centered?

 

I know that on my turbo bike, a few times I had an intake backfire that would spin the two halves of the housing 45 deg. It didn't cause a failure of the bearings or impeller/turbine pieces.

Aren't the two halves mated on a machined dia that keeps them centered?

I thought I would bring it up anyway.

Here's a familiar site to some of you guys..

The back housing is strange for sure.

 

Heh Hoot, is that the new 04.5 dodge turbo!

 

I can't believe Santa didn't hook you guys up . You need to tell him to roll through Ohio this year to see some big charger Max's..... maybe he'll get some ideas.):h