[FastBack71]

Now i Recieved a stock 1988 mustang gt. It is in really good condition 70k miles yadayadayada. If i put a long tube uncatted h pipe and flowmasters exhaust system, with a cold air intake and pullies i would i re tune the engine?

[FastBack71]

i mean how do i retune it? do i need to?

[stang94]

No you dont need to tune it.

[FastBack71]

so after like head work and intake manifolds and everything it just accepts the increase of flow? how does that work?

[FastBack71]

then why do they say mass air is better whats better about it

[bigdog89129]

Just make sure your new headers have a provision for your o2 sensor. this system tunes itself, the computer reads the air/fuel ratio thru the o2 sensor changing the ratio if needed thru the injectors and the amount of air flowing thru the mass air meter located in the intake tube near your air filter. as you open the throttle the computer also reads the throttle position via the throttle position sensor located on the throttle body then advances timing and fuel as needed.
If you go with better heads you should get bigger mass air and injectors to keep up with the higher airflow/fuel needs
Speed density systems don't have the mass air meter. Have Fun.

[lineumup88]

Originally Posted by bigdog89129 Just make sure your new headers have a provision for your o2 sensor. this system tunes itself, the computer reads the air/fuel ratio thru the o2 sensor changing the ratio if needed thru the injectors and the amount of air flowing thru the mass air meter located in the intake tube near your air filter. as you open the throttle the computer also reads the throttle position via the throttle position sensor located on the throttle body then advances timing and fuel as needed. If you go with better heads you should get bigger mass air and injectors to keep up with the higher airflow/fuel needs Speed density systems don't have the mass air meter. Have Fun.

i agree. it is a leaning computer. you mass air adjusts you injector duty along with tour tps and o2s. as far as the injector and mass air swap, im running a 306 w/stock mass air and 19# injectors and a anderson pms and the injector duty cycle at wide open throttle is only 35% so you don't always have to upgrade with heads cam and intake

[93Notchback]

One thing you want to consider when increasing air intake and exhaust output is your engines timing. You might want to increase your timing to about 16 degress in cool weather and about 12 degrees in warmer weather.

[FastBack71]

why cant i just do a 15 second timing advance for year round? will that increase horsepower/torque

[Tony_90fox]

13-14 year round for me. 93 octane.

[cybersynaptics]

If it's a stock 88, what mass air?
Should be speed density.