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  1. Pressureangle

    Towing 16ft Cargo Trailer

    You can cut out the worst of mountain towing by cutting over to Montgomery, AL from Tifton, GA and at your relatively low speed you won't even lose much time.
  2. Pressureangle

    Built in Air Compressor (for tires)

    It's a great add, and easy. If you have a junkyard that takes motorhomes, old diesels quite often have a very high-quality electric compressor for the exhaust brakes. It won't have one if it has air brakes, so look for the crappy ones from the 80s-90s. I got one for $5 because they couldn't...
  3. Pressureangle

    No Exhaust Backpressure = Better performance?

    There are quite a few engine dynamics software packages available, but for any of them more competent than a lawn mower you'll pay a fortune 500 rate upfront, and licencing after that. So no, nothing serious available to the general public, like freeware. Best to simply study the results and...
  4. Pressureangle

    No Exhaust Backpressure = Better performance?

    Yes of course they oversimplify, exhaust theory is more complicated than a theater pipe organ. It's easier to visualize what happens in the exhaust if you think of the exhaust pulse as a slug of water- inertia is the property we're working with. This is why pipe size can't be too big, the gas...
  5. Pressureangle

    '04 Yukon XL 2500 autoride shocks source?

    Thanks a ton. I already found a set of rears. Sad about fronts, I guess, can I put the resistors over standards in the front without disconnecting the ride sensors, or losing the rear autoride? I'm in S. Florida but I get to EP a few times a year. Next time out we'll take you to dinner at...
  6. Pressureangle

    '04 Yukon XL 2500 autoride shocks source?

  7. Pressureangle

    '04 Yukon XL 2500 autoride shocks source?

    Mine's a 2500, no struts. Top post shocks, the connector snaps onto the top of the shock. I have resistors for the rear, but I found a pair of OEM autoride shocks (cost half what the truck's worth, too) it seems by reading that they would work on the front if soldered in. What I'd really like...
  8. Pressureangle

    Brake lights somehow tied into Cruise Control? - SOLVED

    Rostra has been the OEM cruise control supplier for GM for decades. On any Rostra system where I've had reason to look, they use the brake lamps as a ground signal for the module, which sees +/- change to know whether to engage and disengage. If you have LED lamps, I can't say it's the same. But...
  9. Pressureangle

    '04 Yukon XL 2500 autoride shocks source?

    I give up. Who has *front* Autoride shocks, or electronic disablers? I can't find either, ended up with Rear disablers I don't need.
  10. Pressureangle

    How to Make it to 500k Miles?

    My '04 8.1 liter Yukon oil life monitor usually goes to zero about 7500-8k miles. I notice the oil consumption starting to creep up at about 4k, and increases substantially about 6k. So I change it somewhere between 4k and 6k. MPG and oil consumption are legit oil data.
  11. Pressureangle

    How to Make it to 500k Miles?

    The 'Ship of Theseus'.
  12. Pressureangle

    How to Make it to 500k Miles?

    FWIW back in about 1995 I rode in a private taxicab in Miami. It was a 198x Chevrolet Malibu Wagon with 350, heavy duty (police/taxi) package, probably a 700r4. The guy was Jamaican, and the car was spotless and dent-free. I asked how many miles, he said 'about 550 thousand'. I was kinda stunned...
  13. Pressureangle

    What did you do to your NBS GMT800 Tahoe/Yukon Today?

    I thought for a while before responding to this, for fear of sounding condescending or bristly. Forced induction? Hard no. With the exception of small engines working in the top half of their capacity, boost will not improve fuel mileage. It improves power under load. Plus it's *extremely*...
  14. Pressureangle

    What did you do to your NBS GMT800 Tahoe/Yukon Today?

    ECT steady at 181* The throttle body gets cleaned at every oil change, coming due pretty soon. It's never had new O2 sensors, either- dead dead stock. FWIW about 140k miles.
  15. Pressureangle

    What did you do to your NBS GMT800 Tahoe/Yukon Today?

    It's dead stock, there shall be no leaning lol
  16. Pressureangle

    What did you do to your NBS GMT800 Tahoe/Yukon Today?

    '06 *edit* '04. (WTF lol) 8.1 Yukon XL. I noticed that fuel mileage is very sensitive to air temperature; ~14 @ 70F, 11 @ 105F. I also installed a heavy duty fan clutch, which made things worse as it nearly always engaged if standing in traffic at any temperature. (I'm in S. Fla so never cold...
  17. Pressureangle

    Rear 3.42 rebuild odd axle bearing wear

    I guess we're past the OP now, but if I saw those bearing races and housing marks I'd have spun the axles to see if they're bent. Those are typical galling marks from moving against the housing. That they're in only one place and equal on both sides is unusual, I got no theory. Secondly, when...
  18. Pressureangle

    Towing an enclosed trailer with 250k

    I run El Paso to S. Florida regularly. Across Texas much of it has an 80mph speed limit which of course you won't try to match, right? Cooling and A/C are primary. As suggested, flush and change the coolant and clean the condenser and radiator thoroughly, and the evaporator to the extent you...
  19. Pressureangle

    Engine shuts off while driving - SOLVED

    Cuts off steering to the right. Get it to cut off, then confirm the no-start Steer it back to center with engine off, then try restart May give a clue where to look
  20. Pressureangle

    Engine shuts off while driving - SOLVED

    Fuel pump. Best guess. New truck, low miles, Chinese conspiracy.
  21. Pressureangle

    P0446 Code on Wife's 03 Z71

    Waking the dead thread, Persistent/intermittent 0446 DTC. Mom's car, '04 Yuk XL 8.1. Shop charged 3-4 times trying to resolve it, $350 charcoal canister, etc. Put a little silicone grease on the inlet of the purge valve and Presto! intermittent/tiny leak gone.
  22. Pressureangle

    leaking piston rings: seeking advice on process

    Tough one. Consider that you have a bad injector on that cylinder, which would explain the rough running, excessive carbon buildup on the ring lands (detonation blowing the oil off the cylinders and overheating the rings, causing oil from below to coke up) and possibly collapsing the piston...
  23. Pressureangle

    lifter info

    I actually used their least expensive ones, after some long discussion. Still higher quality than next best. They manufacture a lot of the super-high end race lifters under private label.
  24. Pressureangle

    Exhaust Manifold Gaskets/Lifter Tick

    Simple As. http://catalog.remflex.com/
  25. Pressureangle

    lifter info

    I just suck up the price pain and use Morel. https://straubtech-morellifters.com/

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