Myths and Facts about 850 primary injectors....

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11-08-2005 | 11:20 AM

treceb

Thread Starter

to infinity & beyond, me

Joined: Aug 2001

Posts: 5,124

From: santurce

what are they if any?

and how would one make it work?

what changes need be done as far as tuning if any?

grassy ***.......

11-08-2005 | 11:27 AM

FikseRxSeven

Senior Member

Joined: Jan 2003

Posts: 8,079

From: union, new jersey

pro.. you get a total of 600cc more fuel

11-08-2005 | 11:56 AM

treceb

Thread Starter

to infinity & beyond, me

Joined: Aug 2001

Posts: 5,124

From: santurce

this the only useful info i found so far....

http://www.wvinter.net/~flanham/wlan...el/850pri.html

11-08-2005 | 01:10 PM

j9fd3s

Senior Member

Joined: May 2002

Posts: 22,465

From: California

the problem is that the 850's are shorter than the 550's so they spray INSIDE the fuel rail, so the spray pattern gets all weird. if you shorten the fuel rail it should work fine though

11-08-2005 | 01:14 PM

rxrotary2_7

Senior Member

Joined: May 2002

Posts: 465

From: south NJ

Quote:

Originally Posted by j9fd3s' post='776601' date='Nov 8 2005, 06:10 PM

the problem is that the 850's are shorter than the 550's so they spray INSIDE the fuel rail, so the spray pattern gets all weird. if you shorten the fuel rail it should work fine though

the other side of that is that the filter on the injector is not lined up after milling the rail for it to spray outside of the housing....

11-08-2005 | 01:26 PM

j9fd3s

Senior Member

Joined: May 2002

Posts: 22,465

From: California

Quote:

Originally Posted by rxrotary2_7' post='776604' date='Nov 8 2005, 10:14 AM

the other side of that is that the filter on the injector is not lined up after milling the rail for it to spray outside of the housing....

lol, nice! its easier to get the 550's bored out

11-08-2005 | 02:14 PM

treceb

Thread Starter

to infinity & beyond, me

Joined: Aug 2001

Posts: 5,124

From: santurce

Quote:

Originally Posted by rxrotary2_7' post='776604' date='Nov 8 2005, 01:14 PM

the other side of that is that the filter on the injector is not lined up after milling the rail for it to spray outside of the housing....

thanks. me and martin were just talking bout it last nite and since i can get some decent machine shop work done at my job if the benefit outweighed the trouble i was gonna do it. i guess it would be 1 way to try and not hit 100% inj duty....

also, i dont remember if i thanked you for the FPR.

11-09-2005 | 05:08 PM

ccarlisi

Senior Member

Joined: Aug 2002

Posts: 502

Instead of going through all of this hassle for a set of high impedance 10 year old injectors, I bought a set of 83lb (871cc) top feed injectors for ~75 each and a rail from KGParts.

They provide more fuel than the stock injectors and my car idled better with them than any of the 3 other FDs I have played around with that have stock 850 primaries. I have been told by two sources that low impedance injectors are more consistent at lower duty cycle levels than high impedance injectors. That is consistent with my experience.