M998 Turbo Upgrade - BMI Commander™ 6500 Turbo Kit

frauhansen

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Is there also a picture available of how the exhaust fits through the engine compartment to the rear? I'm waiting on my m1123 and this looks like a great update
there are on on the BMI page. The downpipe goes on the outside of the frame down and from there to the back. The rest is plumbing.
 

Action

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Is there also a picture available of how the exhaust fits through the engine compartment to the rear? I'm waiting on my m1123 and this looks like a great update
I think this routes under the frame rail, so it will eat up several inches of ground clearance.
 

Mogman

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is there no room for a intercooler?
According to experience, what is the increase in the temperature of the intake air?

p.s.
For the record. I have already purchased the kit for my 1123 that is still waiting to be shipped.
Here in Europe, 60mi/h is nothing more than a walking chicane.
Yep, was for me, this is a Duramax engine but the intercooler would be about the same, this truck does have a 2" body lift
 

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BMI

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The 6.5 (and 6.2) diesel is a 21:1 compression engine, and should not be running more than 11-12 pounds of boost to be a reliable and sustainable daily driver (the Commander turbo kit is calibrated for 10 to 11 pounds). This is generally considered to be a relatively low psi system, especially by modern diesel boost standards, where normal boost pressures can be in the 20 to 30 psi range, even from the factory.
With boost levels below 15 psi, an intercooler is generally not a worthwhile effort. The charge air is not hot enough to warrant the use of the intercooler. An intercooler actually acts to the detriment of a low PSI system, by adding turbo lag (due to the additional piping) and back pressure through the intercooler itself.
Regarding your charge air temperature question: The overall combustion chamber temperatures are several hundred degrees cooler with the introduction of the charge-air from the turbo; so the addition of the turbo actually helps reduce the thermal stresses on the combustion chamber components, including the heads combustion chamber inserts and pistons (as compared to the naturally aspirated 6.2/6.5 diesel engine), while simultaneously adding power and making the overall fuel burn more efficient.
 

gringeltaube

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An intercooler actually acts to the detriment of a low PSI system, by adding turbo lag (due to the additional piping) and back pressure through the intercooler itself.
Ha.... learned that lesson, about 20 years ago. 6.2L + turbo + large IC: hitting the accelerator out of idle one could see the flexible pipe couplings wanting to collapse, instead of blow(!) And of course there was that momentary black cloud, every time...
 

frauhansen

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I dont think so. What i know about mechanical fuel pumps (VW T4 diesel) is that they are simple to adrjust and simple to time
 

BMI

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You would just turn up the fuel rate adjustment screw inside the injection pump. Detailed instructions on this procedure are included with the kit.
It is not difficult, especially with the correct tools, however it is a bit tedious and great care must be taken during the adjustment as to not damage anything inside the pump.
There is a small tool kit offered with the kit (for less than $80) that includes everything needed to make an easy install. Nothing terribly special, just some tools that may not be in a home mechanic’s toolbox. It makes the turbo kit install go much more smoothly to have those tools, especially the pump adjustment.
 
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