Diesel Tuner's Blog

Drop-In Turbo Option for LLY, LBZ and LMM

[fa icon="calendar'] Mar 7, 2017 1:00:00 PM / by Paul Wilson posted in LLY, LBZ, Turbo, Stealth 64, Stealth, LMM

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Duramax VVT Upgrades:

 

The 2004.5-2005 LLY was the first model Duramax to be equipped with a Variable Vane Turbo (VVT).  VVT  technology provides quicker spool-up, better EGT control, and better overall boost control.  This is also commonly referred to as a VGT or Variable Geometry Turbo. 

To understand the basics of a VVT or VGT technology take a look at this VIDEO on YouTube.

The stock Duramax VVT turbo from 2004.5 until 2010 is similar.  Slight changes to each model (LLY, LBZ and LMM) were made in compressor size, aspect ratio, blade profile and other features.  Despite these changes, you will find the same peak power potential of approximately 530 RWHP.  As a Duramax performance enthusiast this is probably just not enough power to keep your interest for long. 

There are many upgrade options on the market.  Deciding which one is the best for you can be tough.  An endless amount of forum threads and user stories makes it challenging to decipher fact from opinion.  

Stealth 64 Turbo Product Links:

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6 Things To Know Before Upgrading Your Duramax Turbo!

[fa icon="calendar'] Sep 9, 2016 10:00:00 AM / by Paul Wilson posted in Duramax Performance, LLY, duramaxtuner, LML, LBZ, Turbo, Stock Turbo, Stealth 64, Turbo Wheel, LB7, Stealth

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Stock Duramax Turbo Upgrades!

Duramax owners are generally proud of how their stock turbos perform.  They spool quickly, run hard and are capable of over 500 RWHP (once you tune it and make a few supporting modifications to handle the power).  However, after driving your truck around 520 RWHP for a while, the addiction will creep in and you may find yourself shopping for more power.  We all do it!  For some, it may not even be about more power, it may be about EGT control under load, or it may just be the factory turbo had an issue and needs to be replaced.  If you are anything like me, you will not want to replace it with the factory components if there is an upgraded, after market, charger available. 


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Drop-In Duramax Turbo Options

[fa icon="calendar'] Sep 7, 2016 2:17:28 PM / by Paul Wilson posted in Duramax Performance, Duramax, Duramax Power, 2013, 2014, 2016, 2011, 2015, LML, How to program my LML, More Power for my LML?, what are some upgrades I can go to my LML?, Turbo, 2012, LML Tuning, LML Power, Stock, Stock Turbo, Stealth 64, 2017, Stealth

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Drop-In Duramax Turbo Options

In the old days, there was no such thing as a "drop-in" turbo.  You pretty much had to buy a turbo that was designed for a different application and convert it to run on your Duramax.  Meaning the requirements for installation included several custom fabricated pieces to make it work.  

As technology in the diesel performance industry has advanced, our options for parts have expanded.  No longer do we have to use semi turbo's and roal coal to make power.  Now with the common rail injection system and variable vane turbo advancements there is a real need to find a turbo that makes more power than stock, while retaining all the benefits of a stock turbo. 

Benefits of a stock turbo:

  • Quick Spooling 
  • Clean installation
  • Reliable
  • Serviceable by any dealer or reputable shop
  • Requires no custom fabrication

Download Duramax Turbo Specifications

However, they do lack peak power, and peak power matters!  When looking for which upgraded unit to replace the stock turbo, we recommend matching the replacement as close as possible to the desired power level to minimize compromising drive-ability.  Any extra capacity you buy in peak for performance will cost you low end response.  Example: Looking to make 650rwhp? Buy a turbo that can just barely squeak out 650rwhp, do not buy something that's good for 850rwhp because it will drive poorly a light load. 

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How much boost should my stock Duramax turbo make?

[fa icon="calendar'] Jul 28, 2016 11:45:05 AM / by Paul Wilson posted in Duramax, Turbo, Stock, Stock Turbo, Drop-In, Stealth 64, Wheel Size, Turbo Wheel, Stealth

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Duramax engines have always come with solid turbos. However after miles and miles of whistling and boosting, your turbo may have problems. Or you may have other issues, that make you think your turbo has problems. This is very common as most drivers watch boost, keeping an eye on how much PSI they're making. It stands to reason that if your peak boost drops, your turbo has a problem. This is usually not the case though. More often then not, when we diagnose this symptom we find there are other problems leading to a lower than expected boost number. 

Target boost numbers for the following RPO's are as follows (PSI)

2001-2004 LB7- Stock 20-22, tuned 24-26, tuned with PPE boost valve 28-31.  Failure will occur near 34psi

2004.5-2016 Stock 22-24, Mild tune 27-28, Hot tune 33-35

The factory map sensor which electronically measures boost on a 2001-2004.5 trucks only reads to 22-24 psi, 2006-2016 MAP sensors read to 37 psi.  If you want to read boost numbers higher you'll need an aftermarket gauge. 

LB7 Stealth 64G2 Info Request

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How to Boost Test your Duramax

[fa icon="calendar'] May 6, 2016 9:00:00 AM / by Paul Wilson posted in Duramax Performance, duramaxtuner, Duramax, Duramax Power, Charged Air System, Boost Leak, intercooler, Trouble Shooting Duramax, Boost, Turbo, Boost Test

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So many truck come into our shop with high EGT's, turbo lag, excessive smoke output, and bad fuel mileage which are all symptoms of a boost leak. It is so common to devlop boost leak that we now require all trucks to have a boost test done prior to strapping them down on the dyno. What is funny, is that no one shows up knowing they had a boost leak. The reality is that even if you can hit peak boost, you may have a leak, especially if you have a variable vane turbo. Variable vane turbos will change vane position and other operations to try and achieve a disired boost number which may cover up a leak in the charged air system. 

 

 

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