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  1. P

    NEED MORE BOOST

    Makes sense. So, Mel, if you have a "regular" turbo setup is the answer to dial back the fuel screw a bit to bring the EGT down, as well as the other bandaids? What about an aneroid to meter a bit according to boost? In other words, if you have a "regular" turbo system and a Bull Moose, what are...
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    NEED MORE BOOST

    I didn't catch the part about the truck having 3.55 gears, so yeah... that's it! Gears that tall require a lot more downshifting. Think of gearing as a torque multiplier. Lower gears increase the rear wheel torque. If you don't multiply at the axle you have to do it at the trans. Don't not be...
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    NEED MORE BOOST

    My suggestions come on several levels, the first being to adopt a realistic sense of what these old trucks can do... and cannot do. You are dealing with 40 year old tech here. The power density of an IDI engine simply isn't equivalent to anything available today. Most diesel light truck engines...
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    IDI History Story In Print

    Hi Guys, Just wanted to FYI you a little late (I didn't know until last week) that my Ford IDI history story was FINALLY published... only abut two years later than I would have wanted. It's not in Diesel World as planned but in the same publishers sister magazine Ultimate Diesel Builder's...
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    HELP! Need more miles, not more power.

    Check odometer accuracy first! Ours are notoriously INACCURATE. Run several measured miles (mile markers) on a straight road. If you are clicking over exactly 1 mile for every mile run, great. If you are running less (say 9/10s or .9) then mulitply you tank milage by that. Say 220 miles...
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    Sterling 10.25 problem

    I second that question. Also, are they the correct bolts? The correct ones are shoulder bolts of a particular materials and construction but they are not always readily available and not in your average hardware store. Regular Grade 8 bolts aren't adequate in many cases. Finally, it's...
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    Exhaust upgrade recommendations? - non-turbo

    Ah, that's clear now. I don't think the Dynomax y-pipe is substantially better than the stock one, if at all better, but it's the only replacement available I think. If you have time and a few extra bucks, you might try Stainless Works in Chagrin Falls, Ohio (<www.stainlessworks.net>). They...
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    Exhaust upgrade recommendations? - non-turbo

    Mine is a turbo (aftermarket) truck so there may be a little apples and oranges here, but I have that system (adapted to a turbo downpipe) and think that particular muffler is too noisy when combined with 4-inch pipes. Not noise so much as a drone. An annoying one. My drone changed dramatically...
  9. P

    back pressure?

    Well said!
  10. P

    Stanadyne Lubricity Formula

    Does the increase in fuel economy pay for the the additive? Or does it give you better MPG at a higher overall cost?
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    Stanadyne Lubricity Formula

    To follwoup what Mel said above, I too have seen a difference with the Perfomance Formula. It was worth 9 rwhp with a 6.2L GM on a dyno (which was significant since it was only doing about 100) and that translated to about 8 mph faster cresting that first hill out of Denver, CO going west. That...
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    Stanadyne Lubricity Formula

    A lubricity additive is added to low sulphur fuel to make up for what is lost by the new refining process. Supposed to be, anyway. It's often done at the distributor level, not at the refinery. Putting in the additives at the distributor level is common practice and has been for decades. Raw...
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    Oils for the IDI

    Correct Answer! CJ-4 oils are backwards compatible to CI-4 applications (in all but a few specific cases). The CI-4 oils have a slightly stronger ZDDP package (it's not the volume so much as the type of ZDDP used) but the CJ-4 oils have a better dispersant/detergent package. If you compare a...
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    1994 7.3 idi turbo horrible gas mileage

    OP- So the PO "says" it got 15-18 or you have observed 15-18 since you've owned it? Big difference there. So here are some more questions to answer: 1) If indeed it got 15-18, was the PO driving like grandma and now you drive like grandpa after he's had a couple shots? 2) Did the PO...
  15. P

    6.9 precup vs 7.3 precup.

    I can't speak to the 6.9 or 7.3L but what rhk said above was generally true withthe 6.2L GM I built up years ago. I installed turbo heads onto an NA engine and the combustion chamber volume was increased. I actually measured it but it was obvious by comparing the prechambers. I'm not going...
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    Look What I Found In My Engine, Taking Bets!

    Can't see them but possibly cracked head(s). If the block cracked due to front at some distant time, maybe the heads did too. I just looked at a tractor block that cracked over this frigid winter. Not pretty! Had to physically restrain the owner who was in self-ass-kicking mode for forgetting to...
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    Oils for the IDI

    Flip a coin. Any of those three would do an excellent job, assuming they meet the engine's API spec. I advise getting the one which, a) is the best price, and; b) is the most readily obtainable.
  18. P

    Oils for the IDI

    What works for a GM 6.2 will work in an IH 6.9 or 7.3L engine. They had virtually the same lube recommendations. Forget brand names and concentrate more on the API specification. If you find an oil that meets API CI4 or CJ4, you are golden with whatever brand name. You might be a smidge better...
  19. P

    Another oil thread!

    In one sense I agree with you. Pretty much any oil is "adequate." Most will keep your engine operating well under normal circumstances, the operational situations for which it was designed. Until you move closer to the outer edges of the engine operational parameters, just about anything you...
  20. P

    Another oil thread!

    I think you can go 9K but you can't without oil analysis at least the first few intervals. If your truck has a stable operational cycle that doesn't change muchfor the worse, once you establish some baselines, you don't need to UOA every time. But every truck is different... how worn it is, the...
  21. P

    Are ARP Head Studs Overrated for our stock engines with stock boost???

    Nobody said they are TTY bolts, just that they are small, weak bolts and there are too few of them for a turbocharged engine. OK for an NA engine but they may stretch when you put the engine under boost, release the clamping pressure, allow for combustion leakage and the head gaskets are more...
  22. P

    Are ARP Head Studs Overrated for our stock engines with stock boost???

    There is no "stock boost" on a 6.9L IDI, and also not on a 7.3L except for the '93-94 factory IDIT which had 1/2" head bolts, used a better head gasket, pistons, rods, exhaust valves, etc. And all that to run only 2/3s the boost of an aftermarket bolt-on turbo system. IMO, running a 6.9L...
  23. P

    Changing one head gasket, should I change the other side

    I agree... do both, super-especially since you are going to change gasket brands. They are a slightly different compressed thickness and you want combustion chamber volume the same on both sides as much as possible. Most likely it's an installation and torquing issue, not a particular...
  24. P

    what do you guys have for oil pressure

    The filter bypass pressure is the differential pressure between the two sides of the filter. Once the entire system is pressurized, it doesn't matter if the mainline pressure is 40 or 100 PSI, the bypass will only open when the pressure differential between the two sides of the filter reaches...
  25. P

    trans temp gauge

    I like to see all three! In my old Diesel Blazer/Bum-Vee, I had senders in both lines and the pan with a three-way switch and I chose what I looked at. Interesting viewing for a gauge-o-haulic like me, particularly when four-wheeling in hot weather. You really got to see how much good the...

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