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5.0 and 5.7 Discussion, lt1 to lt4 ? in Cadillac Engine Technical Discussion; The speed bug has bitten me again dangit. Inspired by a Mustang Cobra and a BMW M3 going at it ...
  1. #16
    ShadowLvr400's Avatar
    ShadowLvr400 is offline Cadillac Owners Connoisseur
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    Re: lt1 to lt4 ?

    The speed bug has bitten me again dangit. Inspired by a Mustang Cobra and a BMW M3 going at it today. I wouldn;t go as short as a 3.73 gear though. I think a 3.08 or 3.23 would be better overall. Keep an ounce of gas mileage. Then supercharge the LT1. Anyone seen a blown Imp SS or something?

  2. #17
    Cadillac Bob is offline Cadillac Owners Member
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    Re: lt1 to lt4 ?

    Quote Originally Posted by ShadowLvr400
    The speed bug has bitten me again dangit. Inspired by a Mustang Cobra and a BMW M3 going at it today. I wouldn;t go as short as a 3.73 gear though. I think a 3.08 or 3.23 would be better overall. Keep an ounce of gas mileage. Then supercharge the LT1. Anyone seen a blown Imp SS or something?
    You want a 3:73 MINIMUM. My LT1 car with the 4L60E and a 3:73 turned 2000 RPM @ 70 MPH in 4th gear. Anything less will be a waste of money and wont show as much low end improvement. Have no fears about loss of mileage, the miniscule amount of highway mileage you lose will be made up for in spades by the cars off the line performance improvement.

    So while I disagree with Shadow on the gear, I definately agree with him on the blower... if its in the budget, boost is lots of fun!


  3. #18
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    Re: lt1 to lt4 ?

    I dont want to drop to the 3.73, because it's shorter than I want. I'm not looking for all out performance. If I drop, it'd be to the 3.42 gear in the towing package. Can go hunt down a FWB with the tow package.

  4. #19
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    Re: lt1 to lt4 ?

    These cars tend to blow transmissions as far as I hear. It's probably all the weight. I'm guessing hard off-the-line take-offs aren't such a good idea. I'd love to have 400hp to gun it at 40mph and stuff like that...
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  5. #20
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    Re: lt1 to lt4 ?

    I love how you guys want to make your cars faster and all, but to tell ya the truth. They aren't meant to fly, their meant to cruise and be old people cars. Bob has a different story and he and his car just kick ass. Just make your car a heavy hitter when your goin about 20 in a race and just have it boost. Shadow, get the 3.73 gears, Try a chip and a cold air intake. Its a heavy car and not much else than a brand new 383 is going to make it any faster. The 350 is strained as much as it is in that car. Its not going to be a street racer. Its too damn big. Plus, i bet you guys would like to have gas mileage.

  6. #21
    ShadowLvr400's Avatar
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    Re: lt1 to lt4 ?

    Even the 383 is more horses than torque. Really kinda need to make a high torque motor, over high horsepower. Just because of the size of the car. And no, I'm not looking to make a street demon.

  7. #22
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    davesdeville is offline Banned
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    Re: lt1 to lt4 ?

    Rolling races are wack. The only fair drag race is from 0 until someone obviously loses. If you go for 400hp to take off from a roll, just go for less and beef up the tranny to take it from a stop.

  8. #23
    RatedZ is offline BAD EMAIL ADDRESS
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    Re: lt1 to lt4 ?

    Quote Originally Posted by juiceE
    I heard there was a conversion kit, or something to that manner:drinker

    how much do they run 4?

    and how would i go about to gettin more info on it
    Yes, there is a conversion kit that includes the heads, intake, etc. The kit runs approximately $2000-$2200, depending on where you shop. Try www.thunderracing.com or www.gmpartsdirect.com. I've ordered from www.gmpartsdirect.com in the past, and their prices are very reasonable.

  9. #24
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    CadillacZach77 is offline Cadillac Owners Member
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    Re: lt1 to lt4 ?

    Quote Originally Posted by ShadowLvr400 View Post
    Sorry, didn't spot that Question. On the Superchips, for the 94 Fleetwood, 22 horse, 30 torque. Pulls the governor too. Firms up shifts. It'd be worth it. Don't worry.
    I know I'm a few years late on this thread. But this ^ sounds like what I want. I have a 95. Is this the type of thing you need a laptop, software, and knowledge to do?

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