The AFR and Injector size Thread - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

drftmark · 06-18-2008, 10:26 AM

Quote:

Originally Posted by Hawaiian240

Are the Mazda 93-98 FD3S Twin Turbo sidefeed injectors a drop in fit into the KA24DE and SR20DET OEM fuel rail?

I haven't looked anything up but for some reason I think they are low impendence. I am not sure though.

steve shadows · 06-18-2008, 10:30 AM

Lambda is a more precise measurement

krazydriver · 06-18-2008, 07:40 PM

I just want to point out that you don't really want to label 14.6 as the "ideal" idle AFR. While OEM often aims for that for emissions reasons, if anyone has tuned their car they will most likely not get that value.

Tuning idle fueling is really in the interests of achieving the highest vacuum possible. Done this way my car idles best at a 13.7 AFR with ~22 in of vac.
Some really crazy cammed stuff has to go as low a 12.5 sometimes.

97KATURBOSILVIA · 06-18-2008, 07:52 PM

Quote:

Originally Posted by drftmark

I haven't looked anything up but for some reason I think they are low impendence. I am not sure though.

uuuhhhhh ^^^^^^^^^^^^ you dont need to look it up just look at first post by thread starter. It states "Mazda FD Side feed 550cc High 93-98
Mazda FD Side feed 850cc High 93-98"

FD= 3rd gen rx7 or tt rx7 93-95 for usdm

06-18-2008, 10:30 AM	#2
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	Lambda is a more precise measurement __________________ Like Me on FaceBook !

06-18-2008, 07:40 PM	#3
krazydriver Leaky Injector Join Date: Dec 2007 Location: NY Posts: 57 Trader Rating: (0) Feedback Score: 0 reviews	I just want to point out that you don't really want to label 14.6 as the "ideal" idle AFR. While OEM often aims for that for emissions reasons, if anyone has tuned their car they will most likely not get that value. Tuning idle fueling is really in the interests of achieving the highest vacuum possible. Done this way my car idles best at a 13.7 AFR with ~22 in of vac. Some really crazy cammed stuff has to go as low a 12.5 sometimes.