Forums » Grassroots Motorsports » 4.8 turbo questions
  • cwh

    Aug. 5, 2011 7:22 p.m. cwh SuperDork

    OK, we have all seen the ridiculous power numbers that this midget motor can make with a simple turbo. Has me thinking fast thoughts. BUT, what transmission can handle 700hp and 600ft pounds? Will I have to go to a drag built Powerglide, or can a 4L60E handle this? Can a regular T-5 deal with it? Not that I'm going to do this next week, but there are some derelict RX7s around here for cheap. I think I can do this for challenge money. Maybe.

  • Gearheadotaku

    Aug. 5, 2011 7:56 p.m. Gearheadotaku Dork

    T5? No. 4L60E? No. 4L80E? With proper build up, yes. Much cheaper route would be a well built TH350 or TH400. Muncie 4-speed (M-21, M-22) could do it too. A properly prepped T56 could do it as well. You'll have more money in a trans than the motor most likely. Then you need to make a rear end to handle it and a suspension that will hook up, and then.....

    Old enough to know better, too young too care!

  • Ranger50

    Aug. 5, 2011 8:54 p.m. Ranger50 Dork

    If you do ALL the available upgrades to the 60, you may as well get an 80 halfass built for less money and will handle more power. The weak links in the 60 is the powerflow plus gearing. No way do you need a 3.06 first gear in ANYTHING with an automatic.

    "Never trust an intelligent man with no money to play fair."

  • HiTempguy

    Aug. 5, 2011 9:09 p.m. HiTempguy Dork

    Gearheadotaku wrote: T5? No.

    There are gearsets out there that can handle that. Of course, the turbocharger works well with the torque converter; a manual valvebodied 4l80e would be the bees-knees (or, a 6L80E!111!!)

    Rallying; It's like skydiving, except you have to dodge trees on your way down!

  • geomiata

    Aug. 5, 2011 9:25 p.m. geomiata Reader

    viper spec t56 chevy bellhousing?

  • geomiata

    Aug. 5, 2011 9:26 p.m. geomiata Reader

    but not for challenge money.

  • pres589

    Aug. 6, 2011 12:07 a.m. pres589 Dork

    Challenge money makes me think built TH350.

  • cwh

    Aug. 6, 2011 11:59 a.m. cwh SuperDork

    OK, looking over e-bay, I see racing TH350s for 800.00 to 1200.00. Full B&M race rebuild kit for 155.00. Is rebuilding a TH350 something I could consider? No transmission experience.

  • MrJoshua

    Aug. 6, 2011 12:02 p.m. MrJoshua SuperDork

    Buy a 4l80e for ~$300 used and run it until you blow it up. Then buy another used one.

    Just one zuccinni as i get there property Vibram all 5 ring finger shoes and boots anticipating everyone uncover.

  • cwh

    Aug. 6, 2011 12:18 p.m. cwh SuperDork

    I'm concerned about the LOW first gear. Light car, 5-600ft#, low gear equals large smoke cloud and not much forward motion.

  • MrJoshua

    Aug. 6, 2011 12:20 p.m. MrJoshua SuperDork

    Isn't the 60e 3.xx first while the 80e is 2.xx?

    Just one zuccinni as i get there property Vibram all 5 ring finger shoes and boots anticipating everyone uncover.

  • cwh

    Aug. 6, 2011 12:27 p.m. cwh SuperDork

    Don't know, but that would be a lot better.

  • Zomby woof

    Aug. 6, 2011 12:59 p.m. Zomby woof SuperDork

    cwh wrote: I'm concerned about the LOW first gear. Light car, 5-600ft#, low gear equals large smoke cloud and not much forward motion.

    Opposite. Low gear equals better launch. High gear equals smoke show.

    AngryCorvair wrote: and that right there is why 90% of the time i think ZW is a berkeleying douchebag.

  • Ranger50

    Aug. 6, 2011 1:09 p.m. Ranger50 Dork

    Zomby woof wrote:
    cwh wrote: I'm concerned about the LOW first gear. Light car, 5-600ft#, low gear equals large smoke cloud and not much forward motion.

    Opposite. Low gear equals better launch. High gear equals smoke show.

    No, Zw. Lower gears, numerically higher, make for a greater chance of going up in smoke because you can overpower the mechanical limits of the tire against the ground. This is even greater when you lower the overall weight.

    "Never trust an intelligent man with no money to play fair."

  • HiTempguy

    Aug. 6, 2011 2:05 p.m. HiTempguy Dork

    Ranger50 wrote: No, Zw. Lower gears, numerically higher, make for a greater chance of going up in smoke because you can overpower the mechanical limits of the tire against the ground. This is even greater when you lower the overall weight.

    Mike has always had this idea that limiting the rotational speed of said tire on launch vs rpm somehow prevents wheelspin. I have no idea where he came up with this idea, but I've heard him preach it for 6 years

    Rallying; It's like skydiving, except you have to dodge trees on your way down!

  • Ranger50

    Aug. 6, 2011 2:14 p.m. Ranger50 Dork

    HiTempguy wrote:
    Ranger50 wrote: No, Zw. Lower gears, numerically higher, make for a greater chance of going up in smoke because you can overpower the mechanical limits of the tire against the ground. This is even greater when you lower the overall weight.

    Mike has always had this idea that limiting the rotational speed of said tire on launch vs rpm somehow prevents wheelspin. I have no idea where he came up with this idea, but I've heard him preach it for 6 years

    Oh boy.....

    EDIT: IF that was the case, Powerglides would never work.

    "Never trust an intelligent man with no money to play fair."

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