Smog Control Question

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Aug 18, 2005 | 09:09 AM

1975Stingray

Thread Starter

Racer

Joined: Aug 2005

Posts: 377

Likes: 3

From: Northville MI

Smog Control Question

I have a quick question about the smog control unit on a 1975 Corvette...can I just remove this unit to free up some HP? I plan to add True Duals so the exhaust tap will not be a problem. Would this require any re-tuning? Also, I assume you can just take this off an put it back to original if required...not that I would ever sell this car anyway!

Lastly, where can I purchase a complete shop manual for the Vette? I saw one on this site for $100.00, any where else?

Thanks!

Aug 18, 2005 | 09:52 AM

Lee H

Burning Brakes

Joined: Feb 2003

Posts: 1,128

Likes: 4

From: Upland Ca

I have found that the Chilton's repair manual is about the best. $20-$25 at any parts store or vette vendor. I also recommend an Assembly manual. About $30 with binder at any most vette vendors. The assembly manual comes in most handy when making most repairs. Shows how things go together. As for the smog equipment, you will most likely not notice any performace gain from removing the smog pump. You may see some gains from a true dual system, expecially if your cat is somewhat plugged up. I would keep all the smog gear. May come in handy down the line depending on you states smog laws or for resale. Lee

Aug 18, 2005 | 10:28 AM

fauxrs2

Drifting

Joined: Feb 2005

Posts: 1,738

Likes: 2

From: San diego ca

Quote:

Originally Posted by 1975Stingray

The smog pump isnt costing you any horsepower that anything short of a DYNO will be able to sense...maybe 2 or 3 hp...definitly do the duals - THAT will give you much more gain than removing smog gear - the car will sound better and it will require a little tuning to take full advantage of.

Aug 18, 2005 | 10:45 AM

1975Stingray

Thread Starter

Racer

Joined: Aug 2005

Posts: 377

Likes: 3

From: Northville MI

Can you elaborate on the tuning for True Duals? I come from a age of computer tuning so this car has been a great learning experience!

Aug 18, 2005 | 11:13 AM

rihwoods

Race Director

Joined: Feb 2005

Posts: 16,100

Likes: 17

In Calif....all cars from 1975 earlier DO NOT require smog testing....but cars from 1966-1975 are required to retain smog equipment for those year(s).

Aug 19, 2005 | 07:37 PM

I'm Batman

Team Owner

Joined: Oct 2004

Posts: 23,831

Likes: 10

From: Springfield MO

St. Jude Donor '07

As for most anything, eBay is the place to get shop manuals. I paid about $15 (or less) each for mine - I have the '77 car manual (includes Corvette), the '77 Unit Assembly Manual, the '77 Corvette electrical troubleshooting book, the '77 car wiring diagrams, and the '77 light truck manual (for non-corvette reasons).

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