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  1. F

    Cooling fans coming on max after cold engine start, stays on till engine shutdown

    To the OP: I may have missed it, but your temp gauge in the SUV is about as worthless as a dummy gauge. Replace the ECT sensor on the drivers side cylinder head with a "good" one ... Make sure your coolant is good and you don't have any air pockets.. that will trigger the fans to be on as well.
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    HEADERS, MANIFOLDS & CATS

    If your engine itself is stock (no cam, head work, stroker, forced induction) then IMO you would be wasting a lot of money to change out the manifolds for headers. There WILL be more expense than just the headers. You won't gain anything with headers until you have a custom tune done to take...
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    Towing

    I've got the appropriate modification to tow this much. Not everything is in my signature !!! I wouldn't tow this heavy if I believed I was unsafe in any manner. Unfortunately the plan was to travel more but life has gotten in the way. I used to tow this travel trailer with my 94 C1500...
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    Running A CVC BU60FHD Converter with Zeroed-Out Clutch Slip Target -- Any Advice/Experience?

    I think GEOTRASH has that converter
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    Running A CVC BU60FHD Converter with Zeroed-Out Clutch Slip Target -- Any Advice/Experience?

    Just to add, the converter slip is there mostly to do with the DOD/AFM so make sure you turn that crap off FIRST before you do any trans tuning
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    Running A CVC BU60FHD Converter with Zeroed-Out Clutch Slip Target -- Any Advice/Experience?

    If you are going to use HPTuners, then you can get rid of TC lockup in gears 1-3 (some people do 4th too/ I don't). Zero out the slip in 5th & 6th gears. Bring the upshift (shift scheduling) tables up quite a bit so you're not hunting gears so much. Adjust the TCC lockup on the same curve...
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    Turbo and adding snow performance

    We just don't have good E85 around here at all... Some crappy E85... So I'm staying on gasoline. And yeah,, I'd have to reinvent the wheel so to speak to go to E85 The meth injection is a great product. I picked up quite a bit on my SBC - Vortech setup - no intercooler
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    Turbo and adding snow performance

    YUP Methanol Injection is good stuff. I used the snow that had the handheld programer/info. You can adjust when the boost juice comes on in a "ramp up" stage. You'll need a good vacuum/boost source and a place to install the tank, pump and the inline solenoid AND the regular...
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    Towing

    OK.. I guess i missed that... So you really just need to get it adjusted correctly. It takes some time and experimentation.. But if it's "overrated" for your app it may be difficult to dial it in correctly.
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    Towing

    https://www.etrailer.com/Weight-Distribution-Hitch/Fastway/FA94-00-1061.html Here is a fastway that's cheaper . Make sure you get the new ball as they only work with the specific system. You prob don't need the 4 point sway with that camper. The 2 point sway is prob just fine I only did...
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    Towing

    What you are referring to as "sway bars" are not.. They are weight distribution bars. If you are using 15K WDH (weight dist hitch) for a 6K trailer, you prob will never get it in the sweet spot. You could sell that set and go to a 7500 or 10,000 lb system and be way better off... Then...
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    Need Advice on Engine Stumble

    Also could just be the standard old items: bad/worn spark plug(s) or wires, coil pack getting weak, etc
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    Engine and gearbox swap from four speed to six or eight speed on 2008 Z71 ?

    Just my 2 cents... the 8 speed is a POS... some of it due to design, some due to programming etc... Too many problems to waste your time and money on
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    SOLVED - New engine with DOD delete and Cam Motion cam - valvetrain noise normal?

    Glad you found the problem AND Glad you posted the cause/cure. IT's really important to get some of the threads resolved and it helps others out
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    Cold Air Intake for the most power??

    I've tried diff ones on my Yuk and on several other cars over the years. I finally decided on the MIT tube only for the Yukon... The OE filter box IS A CAI !!!! I have a good " green filter" in there (it came with my supercharger that is now gone)... I've looked at my IAT's quite a bit...
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    Supercharging

    Air temps are fairly high, but less than with the roots charger... I don't have an intercooler on my Chevy1500. It's a 94 stepside that is still controlled with the oe obd1 (yuck).. Im around 600ft (kansas city area). I did my first RaceWeek - rockymountainraceweek at elevation last october...
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    Supercharging

    Best fuel around here is 91 and that's with 10% ethanol. Gotta take into account that the "boost" is gonna be lower on a 6.2 than a 5.3 I only get about 9 psi with my vortech and pullied to the hilt on my SBC 422 ci. But it's got great heads/ etc and lots of displacement. You prob understand...
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    Supercharging

    It measured out to max of about 6 psi on my boost gauge... Even at tip in throttle it would go zero vacuum and 1-3 psi boost on my gauge just normal driving.. I think that's why my MPG was so bad. Due to the PCM wanting to richen things up too fast
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    Supercharging

    I did notice a difference of course. I did the headers and high flow cats at the same time. I miss the low end power the SC provides. Just could not live with the horrible MPG
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    Front suspension Torque procedure for 07 Yukon Denali

    Weight should be on the suspension - Loaded - and then snug up your control arm bolts. otherwise they will bind up in "jacked up" position - not good !!
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    Ready to pull trigger on Derale trans cooler - need advice

    Just for more info.. I did not open up my lower bumper/grill for my derale with the fan. I figured I would IF Needed.. but haven't needed it. It's at an angle anyway pointing down a bit. I didn't want to blow hot air UP into the engine compartment. There's a decent amount of dead air space...
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    Supercharging

    Yes, my chassis dyno numbers kinda sucked... And my IAT's were stupid high all the time. So I suppose that's why the tuning is so involved. My edelbrock system even has a water to air intercooler. I tried looking for a bigger intercooler but the one provided was such a nice fit... And a big...
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    Supercharging

    Had the Edelbrock E-Force Roots/Magnuson style... I liked it but MPG was horrible and my tuner at the time couldn't get MPG acceptable... Long story short I tried a methanol injection kit so we could put some timing back in it... Didn't have the settings right and sucked down way too much...
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    Supercharging

    Trans won't hold up at all.. 4L60e with miles on it... stock.. Yikes You'd be better off and cheaper doing the usual hot rod stuff to it Headers, Camshaft (truck stage 1), Cylinder head work while they're off. And of course a tune. Save some money up for that transmission to get it rebuilt...
  25. F

    Axle ratio to tire size input needed

    Just google 6l80e gear ratios.. 5th and 6th are both OD ratios You'll want at least 3.42 gears.. But with the 5.3 I'd personally go with 3.73 . It's kinda pricey doing front and rear. I have 3.42's with stock height tires.. I'd like a bit deeper like 3.73, but I don't have experience...

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