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Thread: 4.8L Project Horsepower - One step at a time

  1. #21
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
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    3,581
    Quote Originally Posted by GasGuzzler View Post
    Yep...and yours being a 4WD and a different year it prolly has more. Is yours an X or a W?
    you tell me. my old 00 s10 extcab 4x4
    blazer is 99

    i think your right 2wd was 180 and 4wd was 190 but seriously what is the difference
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  2. #22
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    Dyno'd new cam.

    I don't have time right now to post graph, but I will later.

    Cam Specs: 220/220 - .581-.581-112+4

    This going through stock manifolds, cats and exhaust system.

    Made 270hp, which is +24hp over previous mods/tune.

    The truck liked 13.2 a/f ratio on this run.

  3. #23
    Slimsilverado Guest
    Can you explain for my ignorant self how a 3600 stall would loose HP but effectivly increase the ET. I know having the higher Stall helps get it outta the hole because of the RPM difference. Is it because the verter is slippin? help me understand please...

  4. #24
    Join Date
    Mar 2003
    Location
    San Antonio, TX
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    11,038
    Quote Originally Posted by Slimsilverado View Post
    Can ... Is it because the verter is slippin? help me understand please...
    Yes. Not much but it is.
    Lock it up and you'll see an increase in HP.

    I'll do some dyno runs with it locked and unlocked to show the difference.

  5. #25
    Slimsilverado Guest
    Sweet whats the difference between locked and unlocked? I notice on mine Nelson tune with my 3k stall in 1-3 it will flash if you at a low rpm up to 3k but in OD 4th it does not do that...

  6. #26
    Join Date
    Aug 2008
    Location
    North Texas
    Posts
    12,078
    That's the diff between the T/C clutch locked or not...the tune being locked is another thing all together...

  7. #27
    Slimsilverado Guest
    so if its locked then the stall is defeated meaning its fully engaged all the time. Dammit Nathan dont leave me hangin...

  8. #28
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    Think of a stall converter this way:

    You have two box fans facing one another. The two fans are acting like the torque converter.
    One fan is connected to the engine and one to the transmission.
    Turn on one fan and you'll obviously notice, the second fan doesn't turn as fast right away.
    As the first fan is sped up, the second one will eventually equal the speed of the first fan. (just assume it will for this explanation).
    As you change the first fans speed from low to high (immitating the throttle), there is a delay when comparing the both fans. This is how a stall converter acts when you play with the throttle.
    Stall speed is determined by many factors, but internally to the converter, the fins are angled to adjust stall speed. If the converter has a flatter fan blade pitch, the higher the stall.
    Now, for lockup. Put a stick through both fans, note they turn the same speed and are considered locked up.
    Some clutches and tunes lock up harder than others, so this is more noticable in some setups.

    With your tune specifically, I didn't allow the converter to lockup 1-3 gears. Actually, if you look at the mph for lockup, they really don't lock up anway with a stock tune, unless you hold each gear.
    Yours only locks up in fourth with light throttle around 40-50mph.

    hope this helps,
    allen

  9. #29
    Join Date
    Dec 2007
    Posts
    3,429
    Quote Originally Posted by farmtruc View Post
    hope this helps,
    allen
    If he still doesn't get it after that explanation... he never will

    Stall converter sticky!
    30' Ford Model A Tudor Sedan - Custom chassis - Big bore LS2 - twin B76's - Glide - 9" w/ 3.07 gears - 30" DR tire - 2k lbs cruiser

  10. #30
    Slimsilverado Guest
    Thanks Allen... F U KURT :flipoff: just wondering i get the basic concept just wondering about the tune n ish and why would you loose some power with a higher stall but i got ya...

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