Hi all,

someone can tell me more infos about this engine? I didn't find anything complete "guide" about this engine on web, except of it's a bigger 2.8

I' d like to knows pros and cons about this. Thanks!!

 

If you tune it. A pro is 3.1l has a 7730 ecm and speed density.

It has a knock sensor
Electronic egr
All serpentine belt set ups

Not too much different else than that when compared to say a 1988 2.8l

 

What exactly mean speed density? What's the difference between 7730 and others?

 

the 7730 ecm is the best and fastest computer put in thirsgens imo.

it's easier to tune and had lots of things you can do with it for its time.

speed density means it has a map sensor to read pressure and vaccum to control it's fueling timing exc. It doent have a mass air flow sensor like most thirdgens before 1990. In my opinion speed density is much easier to tune. The bad thing though is any major modification ie. A cam exc. You have to retune the ecm to get the most out of it. If you had a mass air flow set up, it will compensate for the added airflow to a certain extent. It will even read a little bit of boost about 5 or 6 psi max if you turboed your 2.8l. But if you turboed a 3.1l you need to tune the ecm. Period. Map does not read volume of air. Justhe pressure and vaccum

 

Crystal. Thank you!!