Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
spfi and mpfi.. how do they work?
Posted 12 August 2003 - 03:55 AM
Posted 12 August 2003 - 07:55 AM
when warm they are in closed loop
ECU watches the 02 sensor output and adjusts the pulse width duration to tries to achieve a stoichiometric A/F ratio.
Only diff is the SPFI has one big injector the MPFI has four (two operate simlu so it's not a true "sequential" system, it's called a "batch" system)
Hope this helps
Posted 12 August 2003 - 08:01 AM
Hope this helps.
Posted 12 August 2003 - 08:08 AM
MPFI: multi port fuel injected (one injector in each cylinder)
and yeah, the SPFI was designed as a replacement for a carburated car. (Fords, Chevys, have single port fuel injector setups that can work right onto the small block manifolds)
Posted 12 August 2003 - 10:14 PM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users