New Garrett GT3788VA - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by jdydiesel, this thread has received 15 replies and been viewed 2730 times.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 10-11-2014, 05:01 AM Thread Starter
Dually Club #3
 
jdydiesel's Avatar
 
Join Date: Jul 2007
Location: Pleasant Valley Ca.
Posts: 2,674
Points: 79,446
Thanks: 262
Thanked 139 Times in 120 Posts
New Garrett GT3788VA

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.

Jason




06 F-350 4x4 CC LB Tow Boss Lariat 6.0l auto. Banks PowerPDA, Banks SpeedBrake, FICM Atlas 40 Tune, ARP Studs, PowerMax GT3788VA turbo, Homemade coolant filter, EGR valve delete spool, Monster Exhaust, K&N Cold air intake,Mishimoto Radiator,Husky mudflaps, Line-X bed liner, Recon lights, TUNED BY Innovative.
72 F-250 Gasser.FOR SALE
jdydiesel is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 10-11-2014, 06:34 AM
Stuck in Commiefornia...
 
IdahoF350's Avatar
 
Join Date: Dec 2008
Location: Clearfield, Utah
Posts: 1,296
Points: 81,428
Thanks: 102
Thanked 447 Times in 315 Posts
Garage
New Garrett GT3788VA

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!

The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan

7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4

6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4

6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift

Last edited by IdahoF350; 10-11-2014 at 06:36 AM.
IdahoF350 is offline  
The Following User Says Thank You to IdahoF350 For this addition to TDG:
jdydiesel (10-12-2014)
post #3 of 16 (permalink) Old 10-11-2014, 03:03 PM
Senior Member
 
harry6.0's Avatar
 
Join Date: Dec 2008
Location: Spokane WA. area
Posts: 3,051
Points: 142,064
Thanks: 1,507
Thanked 990 Times in 755 Posts
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

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
harry6.0 is offline  
The Following 3 Users Say Thank You to harry6.0 For this addition to TDG:
amdriven2liv (10-11-2014), jdydiesel (10-12-2014), jsm180 (10-13-2014)
post #4 of 16 (permalink) Old 10-12-2014, 01:52 AM
Junior Member
 
Join Date: Dec 2008
Location: CT
Posts: 118
Points: 20,853
Thanks: 19
Thanked 13 Times in 13 Posts
A billet wheel really wakes up a powermax.
And a FICM tune helps with the lag and MGG's.

Andy 2007 4X4 F350,6.0 PSD, Lariat, CC, DRW, 9' Knapheide body, stainless steel ladder rack, SCT with custom tunes, Banks turbo back, ARP's, ITP RR, Airdog II, head coolant lines, Firestone air bags, Autometer gauges( pyro,fuel pres,water temp,boost,trans temp), CCV mod.
Work&Play is offline  
post #5 of 16 (permalink) Old 10-12-2014, 05:58 PM Thread Starter
Dually Club #3
Threadstarter
 
jdydiesel's Avatar
 
Join Date: Jul 2007
Location: Pleasant Valley Ca.
Posts: 2,674
Points: 79,446
Thanks: 262
Thanked 139 Times in 120 Posts
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.

Jason




06 F-350 4x4 CC LB Tow Boss Lariat 6.0l auto. Banks PowerPDA, Banks SpeedBrake, FICM Atlas 40 Tune, ARP Studs, PowerMax GT3788VA turbo, Homemade coolant filter, EGR valve delete spool, Monster Exhaust, K&N Cold air intake,Mishimoto Radiator,Husky mudflaps, Line-X bed liner, Recon lights, TUNED BY Innovative.
72 F-250 Gasser.FOR SALE
jdydiesel is offline  
The Following User Says Thank You to jdydiesel For this addition to TDG:
harry6.0 (10-13-2014)
post #6 of 16 (permalink) Old 10-13-2014, 04:15 AM
Senior Member
 
harry6.0's Avatar
 
Join Date: Dec 2008
Location: Spokane WA. area
Posts: 3,051
Points: 142,064
Thanks: 1,507
Thanked 990 Times in 755 Posts
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

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
harry6.0 is offline  
The Following User Says Thank You to harry6.0 For this addition to TDG:
jdydiesel (10-15-2014)
post #7 of 16 (permalink) Old 10-13-2014, 12:11 PM
Junior Member
 
Join Date: Jul 2013
Location: Lakeland, FL
Posts: 55
Points: 37,689
Thanks: 31
Thanked 59 Times in 34 Posts
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.
jsm180 is offline  
The Following User Says Thank You to jsm180 For this addition to TDG:
harry6.0 (10-13-2014)
post #8 of 16 (permalink) Old 10-13-2014, 01:31 PM
Senior Member
 
harry6.0's Avatar
 
Join Date: Dec 2008
Location: Spokane WA. area
Posts: 3,051
Points: 142,064
Thanks: 1,507
Thanked 990 Times in 755 Posts
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

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
harry6.0 is offline  
The Following User Says Thank You to harry6.0 For this addition to TDG:
jsm180 (10-13-2014)
post #9 of 16 (permalink) Old 10-15-2014, 01:08 AM Thread Starter
Dually Club #3
Threadstarter
 
jdydiesel's Avatar
 
Join Date: Jul 2007
Location: Pleasant Valley Ca.
Posts: 2,674
Points: 79,446
Thanks: 262
Thanked 139 Times in 120 Posts
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.

Jason




06 F-350 4x4 CC LB Tow Boss Lariat 6.0l auto. Banks PowerPDA, Banks SpeedBrake, FICM Atlas 40 Tune, ARP Studs, PowerMax GT3788VA turbo, Homemade coolant filter, EGR valve delete spool, Monster Exhaust, K&N Cold air intake,Mishimoto Radiator,Husky mudflaps, Line-X bed liner, Recon lights, TUNED BY Innovative.
72 F-250 Gasser.FOR SALE
jdydiesel is offline  
post #10 of 16 (permalink) Old 10-15-2014, 06:54 AM
Senior Member
 
harry6.0's Avatar
 
Join Date: Dec 2008
Location: Spokane WA. area
Posts: 3,051
Points: 142,064
Thanks: 1,507
Thanked 990 Times in 755 Posts
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

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
harry6.0 is offline  
The Following User Says Thank You to harry6.0 For this addition to TDG:
jdydiesel (10-15-2014)
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Hybrid Stage 1 & GT3788VA Turbo ? adambomb 2003-2007 6.0L Power Stroke 3 09-03-2010 06:28 AM
94-97 garrett IDImonsterstack 1994-2003 7.3L Power Stroke 0 06-01-2010 09:07 AM
Garrett TV7512 SSpeeDEMONSS Everything Else 0 10-27-2009 04:15 AM
garrett bb or Tn bb Chad Mayhue 1994-2003 7.3L Chips & Tuners Forum 11 03-17-2008 08:21 PM
Garrett turbo imported_99powerstroke 1994-2003 7.3L Power Stroke 0 01-20-2007 12:21 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome