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back to basics

This is a discussion on back to basics within the Forced Induction forums, part of the LSx Technical Help Section category; Well I have been looking for a good detailed article on picking the correct turbo. I am not an expert ...

  1. #1
    someday joejenkinsglass's Avatar
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    back to basics

    Well I have been looking for a good detailed article on picking the correct turbo. I am not an expert by any means, and would like to upgrade my turbo.

    thanks to anyone that can actually help.

    this is what I have currently.
    408 forged 9-1 cr
    ported heads with studs
    cam 234/238 595/609 lift @50 114 lobe separation
    stage 5 4l60e by RPM ( hopefully it last till I can get the rossler 4l80e w/brake)
    TCI 3500 convertor
    factory rear with 3:23 gears ( s-60 with 3.54 gears on order)
    dual 340 fuel pumps 60lb injectors

    gt45 76mm turbo .66/1.05 ar (needs new seals)

    the turbo was rear mounted when I bought the car. It had a factory style shortblock (346ci). The car was great for roll racing, but since thats illegal not the best set-up for me. I will drive this car around town, to work, and maybe a trip or two. The number one purpose is drag racing though.
    Last edited by joejenkinsglass; 09-13-2009 at 06:08 PM. Reason: typo

  2. #2
    Member cailey37's Avatar
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    1998 Pontiac Trans Am

    Quote Originally Posted by joejenkinsglass View Post
    Well I have been looking for a good detailed article on picking the correct turbo. I am not an expert by any means, and would like to upgrade my turbo.

    thanks to anyone that can actually help.

    this is what I have currently.
    408 forged 9-1 cr
    ported heads with studs
    cam 234/238 595/609 lift @50 114 lobe separation
    stage 5 4l60e by RPM ( hopefully it last till I can get the rossler 4l80e w/brake)
    TCI 3500 convertor
    factory rear with 3:23 gears ( s-60 with 3.54 gears on order)
    dual 340 fuel pumps 60lb injectors

    gt45 76mm turbo .66/1.05 ar (needs new seals)

    the turbo was rear mounted when I bought the car. It had a factory style shortblock (346ci). The car was great for roll racing, but since thats illegal not the best set-up for me. I will drive this car around town, to work, and maybe a trip or two. The number one purpose is drag racing though.


    Google Turbo by Garrett and you'll find what you are looking for. We're not supposed to put up links to other sites on here so that's the best way to get the info you want.

  3. #3
    someday joejenkinsglass's Avatar
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    Thanks I have been looking at it. do you have any recommendations? Also will need a tuner hopefully not too far from cedar rapids.

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    Member cailey37's Avatar
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    Sorry it took so long to get back. Well, since you have a 408, you could get away with a 76mm turbo but a 88mm will be the best. I get mine from Precision. Good units and very reliable. As far as a tuner goes, check out Frost on here.....he can get you in the ball park.

  5. #5
    someday joejenkinsglass's Avatar
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    Quote Originally Posted by cailey37 View Post
    Sorry it took so long to get back. Well, since you have a 408, you could get away with a 76mm turbo but a 88mm will be the best. I get mine from Precision. Good units and very reliable. As far as a tuner goes, check out Frost on here.....he can get you in the ball park.
    No problem, I was thinking 88mm also. What do you think about using the t-4 version instead of a t-6? The one I found is a precision. Tuning as you know is the most important part, and I am sure Frost is great but I would be nervous using a tune that wasnt check on the dyno.

    Frost if you are not more than 2 states away its not out of the question to have you do it.

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