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  1. Mudsport96

    ZERO Oil Pressure

    Start it without the pressure sensor in the block to see if there is oil flow.... just kidding dont do that.
  2. Mudsport96

    If you have blower speed problems check the relay IMMEDIATELY

    As the title says, check the relay immediately if you lose a speed on your blower selection. My wife texted me and said that there was smoke coming out of the dash... relay was shorted and connector and wiring was melted. She said she noticed a week ago that only number 5 worked on the...
  3. Mudsport96

    No Exhaust Backpressure = Better performance?

    I would agree with that except for one thing I know for sure. And trust me I love David Vizards information, it can be invaluable. The 2002 8.1L Vortec (L18) engine is a cast iron 8.1-liter (496 cubic inch) V8 with 330-340 horsepower and 440-455 lb-ft of torque 2002 LQ4 is a 6.0L iron-block...
  4. Mudsport96

    No Exhaust Backpressure = Better performance?

    Factory 99-02 exhaust y pipe
  5. Mudsport96

    No Exhaust Backpressure = Better performance?

    Want to be baffled by engineering masterpieces? Ford v10 exhaust in the super duty trucks.... off of the manifolds 2.5 inches, reduced to 2 inches, before entering a 3 inch pipe going back to the rest of the exhaust.
  6. Mudsport96

    No Exhaust Backpressure = Better performance?

    While pipe balancing may seem to be something you would think is important... it is really not. SOME bends and crimps will hurt power, but if the pipe is sized correctly a bend will not hurt flow. Dented pipe test
  7. Mudsport96

    [SOLVED] 4Lo 1st gear

    I forgot about this case. It was in a youtubers Yukon xl that he put a turbo on. Yeah it died because he didnt know it was awd and he did a few pulls on a 2wd dyno. I do not have a file to check to see if it is different from a regular 4x4 case vehicle, but I would think they are the same for...
  8. Mudsport96

    Lq4 2004 what to do before dropping in

    TUNE and computing power of the E38/E67 ecm was miles ahead of the P59 that the OPs vehicle has. Yes they can run on 87, my old man's '16 runs good on it. It runs WAAAYYY better on e85. Not because e85 "makes" more power. But because of the octane it has the computer puts more timing into the...
  9. Mudsport96

    Lq4 2004 what to do before dropping in

    Unless you are going to be running premium every fill up stay with stock heads. You will end up in the neighborhood of 10.7:1 compression going that route. I am going to assume that this is a daily that you aren't looking to race? If you were to change heads 799s would get closer to 10:1 if you...
  10. Mudsport96

    [SOLVED] 4Lo 1st gear

    What speeds where you trying to do this at? The 04 suburban tune i am currently looking at, does not have "manual mode allowed" enabled. Which means you can put it in 1st, but it will still shift when it thinks it is supposed to. You could get the transgo manual 1st valve and put that in. Then...
  11. Mudsport96

    Motor swap help

    I would try to stick with the 00-03ish maybe 04 engines. I dont remember exactly what year the reluctor wheel on the crank went from 24 tooth to 56. And that would require a different tune and if it was post 03, that requires a p59 computer and not the p01 he currently has. So for the least...
  12. Mudsport96

    Motor swap help

    Usually would agree, but a 6.0 (at least in my area) gets far more pricey than the other two.
  13. Mudsport96

    Motor swap help

    Different motor mounts, Different transmission as the bellhousings are different depths, different wiring harness and computer, different fuel line setups, different radiator in/out locations, accessories and brackets in different locations. Hell I'm pretty sure the computer you need to run the...
  14. Mudsport96

    [SOLVED] 4Lo 1st gear

    Yeah it is probably in the tune. I know that a good portion of the SUVs (and some but not all of the trucks) have a program that doesn't allow 100% throttle in low range if equipt with the electric throttle. So it would not surprise me that off throttle deceleration in low would have something...
  15. Mudsport96

    Question about rim sizes and compatibility

    Man i wish I would have taken a pic of the early 2000s silverado with the ould 16 ralleys on it. Looks horrible
  16. Mudsport96

    Time for a tune up I guess.

    I got 2 sets at the junkyard. Picked them from a couple trucks that were T-bo ned. You know they drove to the sight of the accident, so the odds they are good are pretty good. Used one coil for the Tahoe a couple years ago. I think number 8 went bad, maybe number 6. Popped the used one on and...
  17. Mudsport96

    How real horror can turn into a miracle...

    I have considered going to 1/2 wide industrial zip ties like outboards use on hoses. You want to take about vibration harmonics, my old v4 Evinrude at high idle for trolling will shake your teeth. And that is why OMC used zip ties, can't loosen if you're locked. I even have the zip tie gun for...
  18. Mudsport96

    How real horror can turn into a miracle...

    What weight oil do you use in the truck? In my Tahoe i run 5w30 and in my Silverado I run 10w40 in the summer and 10w30 in the winter.
  19. Mudsport96

    2003 Tahoe 5.3 Flex a dog when accelerating

    You could also try running it almost empty and put half of a tank of e85 in it since it is flex. That is 100+ octane. Should stop any knock you have. Also. Does your scanner have the ability to see what the alcohol content sensor is claiming it sees?
  20. Mudsport96

    Will a Detroit Locker be too aggressive for a daily driver?

    If you lift a wheel, a trutrac can act like an open . You can overcome this by partially applying the parking brake. But, if you really do the wheeling you say you do, get a locker. They can sometimes be clunky on the street. But, I ran one in a Blazer for a couple years and had no issues. I've...
  21. Mudsport96

    2003 Tahoe 5.3 Flex a dog when accelerating

    We used to joke about a friend of mines 79 step side chevy. Had a HEALTHY 406 in the 500hp/400tq range. It had 4.11s and he ran 35 inch boggers. We would go to the local 1/8 mile track and bolt on a set 30 inch tires all the way round and he would run it. Called it the "20 minute big block...
  22. Mudsport96

    Brake issues post cam swap

    Fun fact. If you have your vehicle and it is doing the buzzing and pedal pulse when slowing below 15 mph. You can get on a stretch of road where you are able to get to 30 mph, then with your left foot braking, slow to 15mph where the pulsing and buzzing begins, at that point use your right foot...
  23. Mudsport96

    2003 Tahoe 5.3 Flex a dog when accelerating

    To add a little bit. The power loss i see was 10%. Could be a coincidence that it was about a 10% increase in tire diameter. Lawrence Tolman dynoed his stock lm7 silverado 2wd and put down 231hp/296tq. So if we use the same percentage increase in diameter against an lm7 stock hp, we get...
  24. Mudsport96

    Engine backfire through exhaust

    1. I would get new intake gaskets for one. If the backfire started AFTER you put them on. i would think that it would relate to them...especially it it happened on the previous vehicle they were on. 2. Get a scanner and check codes. 3. Use scanner to check the alcohol content that the flex...
  25. Mudsport96

    2003 Tahoe 5.3 Flex a dog when accelerating

    Monitor your air intake temps. I'll bet they are actually worse than a stock intake box, since you are now pulling under hood air. And this is most likely the majority of the problem right here. A 35 is an 11% increase in diameter. That turns your 3.73 into a 3.31 just by diameter alone. Then...

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