• Welcome to the Pontiac Trans Am Community, the Official Home of the PTA! Sign up for a (FREE) account today!

Improve Performance For 79 TA With 403CI

Joined
Apr 12, 2021
Messages
12
Reaction score
9
Points
3
Location
Minneapolis, MN
I have a 1979 Trans Am with a 403 cubic inch (6.6L) engine.

It has the California emissions package, which reduces HP output.

Any advice about what’s involved and possible considerations to remove the CA emissions kit?

Any negatives about doing so (Car is no longer in CA).
 

Pontiac Trans Am

Smokey
Staff member
Joined
Dec 13, 2018
Messages
1,071
Reaction score
283
Points
83
Website
www.pontiactransam.com
Are you looking to remove the equipment or disconnect and leave it on?

Thank you,
PTA Staff
 
Joined
Apr 12, 2021
Messages
12
Reaction score
9
Points
3
Location
Minneapolis, MN
That’s a good question.

Although I am not looking to sell it any time soon, would it hurt the value if I removed it but kept the parts?

I want to improve the car‘s performance.

The car looks fantastic, but frankly, it’s unimpressive power-wise.

Would there be any difference, performance-wise, disconnecting versus removing?

Based on the published stats, the CA emissions setup reduces HP by 30 or so. (I don’t live in CA).

What are the pros and cons of removing versus disconnecting if I want to further enhance by converting the 4 BL carb to EFI and EFI fuel tank, larger exhaust manifolds, etc.?
 
  • Like
Reactions: Pontiac Trans Am

71 455 HO TA

Member
Joined
May 10, 2022
Messages
8
Reaction score
9
Points
3
Location
USA
It appears your '79 has the Oldsmobile engine that lacked power, even without the California restrictive emissions.

Converting to an EFI, if correctly set up and tuned for your 403, would improve performance and get much better gas mileage than with a carburetor.
 
  • Like
Reactions: Pontiac Trans Am
Joined
Apr 12, 2021
Messages
12
Reaction score
9
Points
3
Location
Minneapolis, MN
Thanks. Is this correct?

To convert to am EFI I need the EFI and manifold; a new, more powerful alternator & battery plus a new fuel tank with an electronic fuel pump.

Anything else?

Any recommendations as to brands and models for aforementioned?

What about recommended brand and model for improved headers and exhaust system?
 
  • Like
Reactions: Pontiac Trans Am

71 455 HO TA

Member
Joined
May 10, 2022
Messages
8
Reaction score
9
Points
3
Location
USA
Your questions about upgrades to your 79 SO REMINDS ME OF MYSELF about four decades ago, when I began my life-long PMD F Body love affair.

I'm hoping I can help you make YOUR best sensible decision.

If driving a fun, fast car that gets excellent gas mileage with the pettiest cash spent in the shortest time possible is the goal ( And for me, that's what IS important ), your 2nd gen Convertible may not be the best choice for you.

Your ride is cool for sure, but it would take a CROWD of time and money to be a "FUN" car.

Go for a ride in a 1998 thru 2002 4th gen TransAm (or Formula) LS model 6-speed.

You'll be floored at their performance, and they get decent gas mileage when driven right.

I had daily drivers of a 70 TA in College in 1985, then in 1971, 455HO was my daily driver for about two years. I LOVED them; both were fast and fun, but they were Gas-Guzzlers, and it was expensive to drive; I could NEVER do it with current gas prices.

IMHO, "Dr. Oldsmobile" would cost a small fortune to do your upgrades, and it just couldn't replicate the LS engine's performance and economy.

You don't NEED to swap out five grand for a fantastic ride that has 40-year-old technology.

My first time diving a '98 Ram Air LS Formula with a six-speed was WORLDS ABOVE both of the earlier models I drove.

Drive what you want to drive; KNOW what you are in for with the MEGA-project your '79 would be.
 
  • Like
Reactions: Pontiac Trans Am