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Which Truck should I buy

 
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  #36  
Old 10-08-2013, 08:51 AM
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Re: Which Truck should I buy

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Originally Posted by IdahoCTD View Post
Jeff,

I wouldn't touch the 2001-2004 LB7 motor unless you want to spend some money on injectors or want to do a conversion to a LLY (2004.5-2005) or LBZ 2006-2007 motor. The injector design was one thing Isuzu messed up on. I build/sell hot rod parts for diesel trucks for a living so I have a pretty good idea which ones are the best. The LLY's have injector wiring harness issues and some had over heating issues. The LBZ's (2006-2007) and 2006 LLY's (the same motor just derated) were probably the best overall package. I have a 2008 LMM that makes 570hp to the ground how I drive it daily and have a race tune that is 640hp. It's been that way since 500 miles and now has 70k. My truck has never got that great of mileage though. BTW the 2006 and up trucks had 6 speed Allisons rather than 5 spd.

For Dodge's the best years are 2003-2007 5.9L with the 2003-2004 and the 2006-2007's probably getting the best mileage. 2006-2007 can be tuned with EFI Live and with a good tune can get some really good mileage as well as make some good hp. The down side to the Dodge's is the 4 speed auto tranny. If you build them they are tougher than a Allison and many of the top Duramax race trucks run Doge tranny's. The Allison uses adaptive learning (aka tap cells) to try and predict what the driver is going to do but with a high hp truck that means it tries to be too smart and burns itself up. The 2007.5 and up to 2012 Dodge's can get good mileage with everything deleted but the 6 spd 68rfe transmissions are junk. The aftermarket parts are getting better for them but they use the same shifting as a Allison.

I started into this a Dodge guy and still have a 2006. I do still think the 5.9L Cummins is the best motor for longevity out of all of them but they had some issues with dropping valve seats that didn't seem to be a specific year. All of the trucks need some things to help them out.
Very good info! Making me feel good about my recent 07 Duramax purchase What do you recommend guys doing to tune up a Duramax to give it the best performance without going crazy. Chipping/tuning makes my stomach turn but it seems to work in trucks, my experience with it is in Ag tractors where chipping/tuning has been a parts and service opportunity!!
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  #37  
Old 10-08-2013, 08:57 AM
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Re: Which Truck should I buy

Mike,

There are exceptions to everything. I know of several high mileage LB7 motors (2001-2004) that have never been touched. I also know of many more that have gone through 2-3 sets of injectors. I actually have a friend that does quite well converting LB7's to LLY's or LBZ's because of the injector issues. In one of the high mileage trucks the owner runs a quart of ATF every other tank of fuel. I think a good additive definitely helps. The quality of diesel is pretty poor now days and since going to ultra low sulfur it seems injector failures are much more common. The newer injectors seem to handle the ultra low sulfur better though.

Nathan
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  #38  
Old 10-08-2013, 09:04 AM
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Re: Which Truck should I buy

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Originally Posted by bigngreen View Post
Very good info! Making me feel good about my recent 07 Duramax purchase What do you recommend guys doing to tune up a Duramax to give it the best performance without going crazy. Chipping/tuning makes my stomach turn but it seems to work in trucks, my experience with it is in Ag tractors where chipping/tuning has been a parts and service opportunity!!
A good EFI Live tune will help the mileage and add some power. A stock Allison is quite tough but pushing much over 100hp extra will burn it up over time. The stock turbo won't cool over 100hp extra very well either. Also get a EGT gauge or a Edge CTS monitor to keep track of things. The monitor will also help trouble shoot things if you have a problem. I also highly recommend rerouting the crank case ventilation and blocking the EGR. The two make a nasty gritting paste in the intake parts that do nothing to help longevity. A used Duramax will have oil pool in the low spots of the intercooler and you'll see where the lower intercooler boots are oily because of it. That is the crank case ventilation being sucked through the turbo.
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  #39  
Old 10-08-2013, 10:05 AM
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Re: Which Truck should I buy

As an aside, we see injector issues across every make due to the fact that ULSD has no lubrication qualities. What occurs is the injector pintle galls and when that occurs, the spray pattern goes to hell or they stick and instead of spraying (the diesel must enter the combustion chamber as a mist for proper spontaneous ignition).

We recommend an aftermarket additive to increase the lubrication quality of the ULSD. I myself use the Caterpillar additive but any quality aftermarket additive works. Only takes a little, typically 1 ounce to 100 gallons. I've heard of owners adding 2 stroke oil or ATF to the fuel but I can't substantiate that as far as lubrication for the pintles. I can with the Cat additive and I believe JD also markets a fuel additive.

I said many posts back that the Isuzu built engine suffered from fuel stream filtration issues (which has been corrected). That was prior to ULSD.

Thank Obama and the 'green inititative for ethanol and ULSD diesel.
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  #40  
Old 10-08-2013, 10:10 AM
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Re: Which Truck should I buy

[QUOTE=IdahoCTD;861817]A good EFI Live tune will help the mileage and add some power. A stock Allison is quite tough but pushing much over 100hp extra will burn it up over time. The stock turbo won't cool over 100hp extra very well either. Also get a EGT gauge or a Edge CTS monitor to keep track of things. The monitor will also help trouble shoot things if you have a problem. I also highly recommend rerouting the crank case ventilation and blocking the EGR. The two make a nasty gritting paste in the intake parts that do nothing to help longevity. A used Duramax will have oil pool in the low spots of the intercooler and you'll see where the lower intercooler boots are oily because of it. That is the crank case ventilation being sucked through the turbo.[/QUOTE]

All well and good and something I did with mine right off (my 7.3 that is), but don't can the parts. Your truck won't pass an emissions test if your respective state enacts mandatory emissions testing. The way this country is heading, thats entriely possible.

Blowby mist is nothing compared to the EGR coking up the intake btw.

I'm a road draft tube person....lol
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  #41  
Old 10-08-2013, 11:39 AM
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Re: Which Truck should I buy

Quote:
Originally Posted by SidecarFlip View Post

All well and good and something I did with mine right off (my 7.3 that is), but don't can the parts. Your truck won't pass an emissions test if your respective state enacts mandatory emissions testing. The way this country is heading, thats entriely possible.

Blowby mist is nothing compared to the EGR coking up the intake btw.

I'm a road draft tube person....lol

They'd never catch a EGR blocker plate for emissions on a Duramax. It's a thin plate that slips in between the up pipe and the EGR. You could even cut the tab off you use to hold it if a person was that worried about it.

Blow by mist combined with EGR makes a hell of a mess and is like a lapping paste in the intake system. Getting rid of both is the smartest thing to do. If you cut the plastic crank case vent tube and put some hose and a "T" in it can go back the way it was later. Pretty simple fix.
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  #42  
Old 10-08-2013, 12:25 PM
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Re: Which Truck should I buy

I suspect the scenario would play out much as the Class 8 scenario scenario is playing out. It's not a matter of sniffing the tailpipe for out of parameter emissions, in fact, thats old technology.

What is done now, is emissions testing officials plug into the molex connector that is on every engine management computer (all vehicles) and down load the snapshot data.

Every vehicle built in the last 10 years or so has the capability (some more,some less) to record in non-volitale memory, everything from sudden stops to hard acceleration and excessive side forces plus it records all engine and chassis events. It updates continuously and it's inside the ECM.

It's become SOP for insurance crash investigation as well.

You modify the engine and change the operating parameters, and it records the event. You install the plate you refer to and the ECM notes the change in parameters and records that event. Don't have to have a check engine light or fault code, it's recorded and all any officer has to do is plug in and down load.

In fleet safety, I have a program on this laptop that allows me to snapshot any of our trucks at any time to check for things like excessive speed, hard stops and excessive side forces and I can to that without plugging in, with a keystroke.

The transponder is coupled to the ECM. All I have to do is ask the transponder for the data and it's mine.

In my position as fleet safety officer, I need that, not to incriminate an employee, but to observe driving habits and take corrective action, if necessary.
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