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Dually Club #3
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Just did the first drive of my 06 6.0l with a new Powermax GT3788VA. So this is the first review of the turbo performance. First note is that the turbo is considerable louder. I like it but my wife will not. I might have to put my cat back in to quiet it down. You can also hear that the amount of fresh air moving through the turbo is considerably more. I did notice that the turbo is not as quick to light off and the throttle response is not as crisp as stock. But I will say that this new turbo harder and longer through the entire powerband. I have never put my truck on a dyno but I would guess that this turbo gave me at east 75 HP more. While I have not done any calculations on fuel mileage yet, it appears that I am getting better mpg. I will know more after a few tanks. The EGTs also appear to be lower but will know more tomorrow when I pull my trailer. Hope this helps those that are looking for a new turbo to decide that this is a very good alternative to the stocker.
 

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Stuck in Commiefornia...
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The cat makes a huge difference in sound level and will actually help your turbo lag a bit. The small amount of restriction the cat provides maintains a pressure column in the exhaust post turbo. The pressure column makes it so that the exhaust energy is more readily available to act on the turbine wheel. I'm not talking about any significant amount of back pressure though, just a minute amount, and it will make a difference. This has been discussed years ago in this forum, with arguments both ways, but my 6.0 always ran better with the cat than without. My 7.3 doesn't care either way though.

Oh, as for the seat of the pants gain, if the truck had been running poorly from an ailing turbo, that's probably not too far of a stretch, but in reality, with stock programming, you're probably within 10-15hp of the stock turbo.

Sent by my right thumb!
 
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I have an extra 4in dia muffler where the cat should be, my P-max is quiet.

SCT custom tuning by the right person can bring back low end throttle response off the line equal to stock.

Mid range and top end these turbo's pull good and hard, really has a mid-range wallop.

Mileage increase is what most all notice with the P-max, this is due to less backpressure at lower rpms and cruise speeds. EGT's cool very quickly when coming to a stop, and are very low at normal cruise speeds.

If you dont' keep it spooled up when towing, then you will see increased EGT's, but with the tuning I run, it's no problem, EGT's stay under 1100F. And since your dually is a tow boss model, it likely has 4:30 gearing, so you should be fine. We put a P-max in my buddies 06' tow boss some yrs back and it runs very strong, including towing.

Harry
 

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A billet wheel really wakes up a powermax.
And a FICM tune helps with the lag and MGG's.
 

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Dually Club #3
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Discussion Starter #5
Thanks all for the comments. I towed a 7000 lbs trailer yesterday and here are the results. FYI, I also updated my signature as I realized it was not accurate by some comments.

Wife didn't complain about the noise, but I might try putting the cat back in and run it for while. What I found was that when climbing any hills in 5th the EGTs would climb but I could control them with my right foot. But when I got it to downshift, the EGTs would fall considerably and I could really get up the hill with EGTs less than 1100. I am very happy with this new turbo and it's performance. I am going to try a few different tune options that I have. I would like to find someone that can tune this better and will be looking around.
 
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I run a tow tune from Mike at KEM Performance, my truck runs very well all around with this tune, but I'm also running an inferred EBP strategy.

My buddies 06' tow boss like yours runs Erics tuning from Innovative. His truck with an aggressive street performance tune really runs good, but I wouldn't tow with that tune. He loads back in a tow tune when towing.

Harry
 
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Harry, what mufflers are you running? I have 4" turbo back with muffler and no cat and need to do something about the whistle.

I run PHP's tunes and am very happy. Just came back from a 600 mile trip pulling 10,000 lb fifth wheel, all flat ground here in FL, EGT's stayed 850-900 and 13 mpg. On a couple of hills I found I could get the egt's up to 1150 if I lugged it. I run the 80hp Daily Driver when not towing. I also have Atlas 40 with a strategy rollback and inferred EBP.
 

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My exhaust is a turbo back Banks system that originally retained the cat. I installed a short length 4in dia diesel muffler from Magnaflow, it's been on there for along time now. It's one of these (below link), I think it's the 14in long one, but I would have to go out and measure it, maybe this evening when I get home from work.
http://www.magnaflow.com/diesel/dieselMufflers.asp

Thanks for the feedback too. My P-max has been on for well over 4yrs now with no troubles.

Harry
 
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Dually Club #3
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Discussion Starter #9
Harry,

Have you had to pull the P-max and clean the unison ring in those 4 years? Just trying to keep in mind any preventive maintenance that I need to do to the turbo. I want years of trouble free use.
 

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Nope not once, and not a hint of turbo sticking or malfunctioning.

My oem original turbo was sticking and overboosting. Would blow boost pressure back out the intake while towing or cruising down the highway on a slight uphill grade, pulled it apart and found it was not that badly carboned up, but that the housing was worn where the unison ring rotates on. I already had a P-Max on order from Orange County Diesel in CA, but Garrett wasn't releasing them for sale yet at that time until all the intial main batch was manufactured and dealers were stocked for the official product launch. Garret had previously released a few turbo's for market testing and those were snatched up quickly, and I unfortunately missed out on one of those. Long story short, I put the oem turbo back on after completely cleaning and applying high temp anti-seize to the worn areas while awaiting my P-Max shipment release. Truck ran great for about 2-days, then it was malfunctioning again exactly the same as before. Then lo and behold my P-max showed up on the 3rd day, Orange County diesel was able to get Garrett to release one for me early, it's been on ever since. I also installed the supposedly larger less restrictive turbo oil drain tube at the same time, but I honestly cannot see that much of a difference between the two.

Hot sizzling summer towing to cold sub-zero winter, my P-max has been working great so far.

Harry
 
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Dually Club #3
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Discussion Starter #11
Thanks again Harry. I will be looking for tunes now and I will update once I tow the big trailer.
 
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not to high jack but I just got a P-max for the 03 I have since the OEM turbo crapped out after 195k miles. it has tunes from Eric at Innovative now. can I get away with using those or should I call him up and have him tweak the files for the p max turbo?

glad everyone likes the powermax. made my decision easy to pick a turbo to replace the factory one.
 

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Have him adjust your tunes for the powermax.
Did you think about getting a billet wheel for it. It helped a lot with mine.
 
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not to high jack but I just got a P-max for the 03 I have since the OEM turbo crapped out after 195k miles. it has tunes from Eric at Innovative now. can I get away with using those or should I call him up and have him tweak the files for the p max turbo?

glad everyone likes the powermax. made my decision easy to pick a turbo to replace the factory one.
I would install the P-Max first and try the tunes you have, just to see how it runs, or a least to get a baseline as what needs tweaking in the tuning.

My buddies 06' runs good on previous tunes from Eric on his P-Max, but our 03's are a bit different in the Hi-press oil system pump and rails and intake manifold then 06' yr models.

My 03' certainly needed different tuning to operate right, so Work&Play's suggestion is probably correct for the final outcome.

Harry
 

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