1981 Headers, Emissions System Delete.
Thread Starter
1st Gear
Joined: Dec 2014
Posts: 1
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1981 Headers, Emissions System Delete.
Planning to Remove emissions system for installation of headers and Cat. converter delete. for true dual exhaust.
Engine is original to the car (190 hp - 4 speed)
Mild cam\lifters installed
Timing increased
So Question is: The Computer controlled Carb. and Distributor, is it worth getting rid of it? or Tuned for better performance?
Looking for a better sound (headers & exhaust) HP doesn't have to be too much of an increase.
How much power can the computer get from a tune?
What is the cost of getting rid of the computer system all together?
Engine is original to the car (190 hp - 4 speed)
Mild cam\lifters installed
Timing increased
So Question is: The Computer controlled Carb. and Distributor, is it worth getting rid of it? or Tuned for better performance?
Looking for a better sound (headers & exhaust) HP doesn't have to be too much of an increase.
How much power can the computer get from a tune?
What is the cost of getting rid of the computer system all together?
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
I'm not very well-versed in what kind of ECM tuning options are there for the electronic distributors. The carb AFR would be best tuned mechanically - by adjusting the secondary AF ratio.
Headers and exhaust will give a GREAT increase for that motor.
I wouldn't get rid of the computer system myself, but if you really wanted to, you'd need a distributor and carburetor. $400 is around where I'd guess the low side is, but the sky's the limit from there.
Headers and exhaust will give a GREAT increase for that motor.
I wouldn't get rid of the computer system myself, but if you really wanted to, you'd need a distributor and carburetor. $400 is around where I'd guess the low side is, but the sky's the limit from there.
Le Mans Master
Joined: Feb 2011
Posts: 5,943
Likes: 61
From: Southern NH
I'm running the stock carb, distributor and computer with long tube headers and side pipes.
Just make sure you put an o2 sensor bung in your new exhaust and you'll be fine.
There's no tune for these computers, it only controls the spark advance and the fuel trim at idle. The rest is controlled by the carb to old fashion way. So if you want to "tune" the carb you would do it like any other carb.
One thing you can do is set your initial timing to 14-16 degrees from the stock 6 degrees.
Just make sure you put an o2 sensor bung in your new exhaust and you'll be fine.
There's no tune for these computers, it only controls the spark advance and the fuel trim at idle. The rest is controlled by the carb to old fashion way. So if you want to "tune" the carb you would do it like any other carb.
One thing you can do is set your initial timing to 14-16 degrees from the stock 6 degrees.
