jgrts20

Do we have top feed injectors? Will 550cc work fine for my mods?

RacerNo39

yesw it is top feed. and yes 550 will work. 550 is factory injectors from a turbo 7. depending on wat kinda mods ur looking to do, but yes they will work.

NZConvertible

You don't need bigger injectors for you very mild mods. You will only make the engine run worse.

bl0d

Stock S4 N/A injectors are 460's on both primaries and secondaries. Pretty sure that on all year FC's the primaries and secondaries were the same size, maybe even on all year TII's.

Also, i've seen many postings about the stock 460's being enough for 250~whp. Those 550's would be fine for a TII, but way too much fuel for an N/A that isn't bridge or peripheral ported.

Just get your current injectors cleaned. Not nearly as expensive, and your car will still run well (if not better).

NZConvertible

I don't know where you got that crazy idea from, I assume you're getting confused with FD's (550/850). Didn't you think it was a bit suspicious that the NA supposedly had far more injector flow than TII's?

gxlspeeder

Straight from the FAQ

What size injectors does my RX-7 use? What colour are they?
Year Engine Plug Size Colour Part #
84-85 13B NA, low square center, 680cc, orange, 195500-0900
86-87 13B NA, low square center, 460cc, red, 195500-1350
86-87 13B Turbo, low square center, 550cc, tan, 195500-1370
88 13B NA, high square offset, 460cc, purple, 195500-1350
88 13B Turbo, high square offset, 550cc, purple, 195500-1370
89-91 13B NA, high oval center, 460cc, red, 195500-2010
89-91 13B Turbo, high oval center, 550cc, purple, 195500-2020

jgrts20

maybe I will just get them cleaned, I will be lucky if im pushing up to 200 hp. If the stock are rated up to 250 then stocks will have to do.

HAILERS

Buy a SAFC and a wideband and LEAN the mixture out. Don't buy the SAFC and no wideband unless you can go to a dyno shop and have them do it.

melicha8

iTrader: (1)

Just got mine cleaned from witchhunter performance. $15/injector, cleaned and tested with free return shipping. Car runs great now

88 GXL

jgrts20

great secondaries arent working, now what? 4000 rpm's hits a wall spitting out fuel and going nowhere above 4000.

NZConvertible

Check to make sure the electrical connectors on the secondary injectors are clean and secure.

jgrts20

gotcha, I think im gonna run a volt meter on them to see if they are really working.

jgrts20

ok so I used a volt meter to find the resistance, the injecters read 4.5ohms(secondaries)and the wire coming outta the crank angle sensor reads 110ohms. So theres resistance goin' throught all. Is the anything else I can check to figure out why my secondaries stopped working?