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Turbo installation on 73 TA


1973 Pontiac Trans Am 455, Garrett 77mm turbo (now 88mm!) & Methanol injected
Night at the track , my TA with previous owner Mark L
73 TA turbo 462 Videos
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Anonymous on Oct 26, 2010 said:

Holy crap thats sweet!

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aronhk_md on Oct 26, 2010 said:

Thanks! Hopefully as the winter progresses I can get new pics with the new changes, including the March Serpentine Track system for the front. Gotta have A/C in every 1100hp car dont we? :)

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Anonymous on Oct 18, 2012 said:

So where are these new pics? And I want specs! I have a mild 455 that I was planning on do very much the same. Just want to know if I'm way off on what I was thinking of doing. Name brand part's or have u had any luck with the cheaper turbos, valves etc... Ben

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aronhk_md on Oct 22, 2012 said:

Ben, I have been a bit delayed on getting the tilt front end hinged. It required designing my own prototype and I have gone through 3 designs. This one looks like it will work though. It will tilt, lift, and move forward all in one movement with twin electric actuators.

The engine has been broken in on the stand and is now in the car. Fitting of various small things and the turbo still to come, but I need the front end in place first.

Minimum items you need to do a turbo 455 are forged pistons, better rods than stock and a compression ratio between 8-8.5:1 - nothing higher. From those minimum requirements there are many other things you can do. Best bet is to hop on and visit is in the boosted sections of the tech forums on or

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aronhk_md on Oct 22, 2012 said:

Oh, I use some ebay knockoff stuff, but the turbo is a Garrett 4788. Tubing, silicone connectors, t-bands, etc are fine to use the less expensive components. For fuel delivery, computer stuff, the turbo I like to stick to name brand. There are plenty of good and bad comments out there about off brand components that it really comes down to what YOU think.

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Dogefog on May 5, 2015 said:

I'm interested in adding a turbo, but unable to locate any, could you please give some info ...

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