Recent content by blueshift
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Head gasket build
Dang. At least you felt it and stopped turning before snapping it completely off. Also, you just reminded me of a mistake I made when installing those. So with the crush washer for those (the one going to the head), make sure the little connector tab that joins the top and bottom washers... -
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can someone bring me up to speed on tuning?
A bit of a contrary opinion on a forum with 'diesel' in its name, but have you considered just getting a gas truck? If you're towing heavy a lot, then the diesel still probably makes sense, but the newer gas engines are lightyears better than the ones of the mid 00s. More than sufficient for...- blueshift
- Post #5
- Forum: Duramax Tuning, Logging, and Gauges
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Head gasket build
As mentioned above, it's part of the PCV system. There's a little chamber with a baffle built into the large aluminum alternator bracket. Any positive crankcase pressure is routed down into this box and then out the vent tube in the bottom of the bracket (vents right next to the crank pulley... -
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1/4 mile discussion and time slips post here!
Ah, gotcha. (y) I wonder if that's the fastest he ever went? Fairly sure I remember seeing him pull a 5.7x pass at Rudy's roundabout 2015, which should be a decent bit quicker than a 9.24. Didn't see him there either (even with the username TheBac pointed out). I'm not totally surprised. I...- blueshift
- Post #2,518
- Forum: 1/4 mile 10.999 or quicker Duramax-powered list
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1/4 mile discussion and time slips post here!
Wow. I didn't realize just how many ridiculously fast Duramax's there are these days. Anyone know if Buck Spruill's username is on that list somewhere? I remember watching that truck go LOW 6's as far back as like 06/07-ish. Don't remember ever watching him do much 1/4 racing, though...- blueshift
- Post #2,515
- Forum: 1/4 mile 10.999 or quicker Duramax-powered list
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Head gasket build
Not the OP, but currently in a similar situation, and I agree 100% (especially the bolded). As I mentioned earlier, I'd already decided to do the soft fuel lines, as they looked pretty bad. Finally swapped them out last night, and WOW, they were awful. I swear I could almost see through the... -
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Newbie tuning
At the end of the day, the broad concepts of tuning these trucks are not that complicated. 1. You press the accelerator, which demands some amount of fuel ("Throttle Base Injection Quantity") 2. At that TBIQ, it looks up a desired fuel pressure ("Fuel Pressure Base") dependent on rpm. 3...- blueshift
- Post #10
- Forum: Duramax Tuning, Logging, and Gauges
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Head gasket build
Ha, I feel your pain. I'm also smack dab in the middle of replacing the injectors on my LB7 (though 'just' the injectors). I'm honestly pretty surprised that it was running fine prior to teardown, because it had some similarly bad looking things going on with the cups (though mostly with the... -
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Increasing Rail Pressure to Control Idle Haze
Update for anyone wondering. I kept on driving the truck after bumping the pressure, albeit only for shorter trips close to home. I used this time to brush up on EFI Live and tuning; it's been a minute since I've touched any of this stuff! Anyways, the smoke was minimal and balance rates were... -
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Increasing Rail Pressure to Control Idle Haze
I'm definitely going to put 45% SACs in it, and I've got almost 3 weeks before the first trip coming up.. If I knew I could figure out the tuning fairly quickly, I might try to go ahead and get it knocked out beforehand. Just worried that getting them dialed in will take a substantial amount... -
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Increasing Rail Pressure to Control Idle Haze
Yea, that's exactly my dilemma. It seems fine with the bumped rail pressure, but I'm worried that I might be making their demise that much more severe / quickly onset.... The cold weather thing is a good point I hadn't thought of. Last winter when I made this trip, it was right at 0 one... -
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Increasing Rail Pressure to Control Idle Haze
Hello everyone. I have an LB7 (that I tune myself) with some injector(s) going out. Main rate in the 5s, and balance rate on #8 coming in around -4.5 to -5.0. Confirmed that #8 is the primary culprit via DVT in EFI Live. The haze and smell has gradually gotten worse, to the point of being...