RX794

I can see why there could be a truth to that if they weren't bored out properly, BUT the injectors that I had done have been used for about 4 years now with no problems(I sold them to someone else who is currently using them), they function fine and don't have any problems and/or DO NOT have any sealing problems.

fd3st04

rx794,
who bored out your injectors? and to what size?

t04rx7

Has anyone actually used these Blitz 850cc injectors in the stock FD primary fuel rail? Does anyone know if the Blitz injector's use the same electrical connector as the stock primaries do?

Also, if anyone has some 1300cc injectors for sale outright (not an exchange for stock secondaries), let me know..

RX794

RC engineering(http://www.rceng.com/) did them, they did a great job, and the turn around time was when promised. If I remember correctly the 550cc's I had were bored out to 950cc's, this was good cause I used them in the primary location without having to modify the primary rail, or shave the top of the it down like you would if you had to use stock 850cc's in the primary location.

mono4lamar

iTrader: (32)

bringing this 4 year old thread back to life! im pissed the two links in here are dead... they would have answered my questions! is there a drop in 850 where you dont need another ring? and do the 1680s really mess up the throttle? im considering going to 1680's from my 1600's and from my 550 primaries to 850's. any info that i should know or can be shared?

dhahlen

iTrader: (5)

I run 850/1680cc - i dont have any problems. Problems with throttle? Umm... no.

What do you mean.. drop in 850 where you dont need another ring? huh?

If you have 550's you obviously need to mill 1/4" off the top of the primary housing.. it was either 1/4" or 1/8" - search for the answer. Then you can use your stock rail to throw in the 850ccs like I did.

I am considering boring them out to 1000cc - but right now 850cc is fine. I'd do larger if I had my haltech installed =P It has better idle control than the PFC =/

GoRacer

iTrader: (2)

There are no drop in (550 length) 850's for the primary rail. Blitz makes 850 side feed as well as 550 but those are OEM (length) replacements and so does Power Enterprise but you will still need to modify the rail. I had the top shaved 1/8" and also inside lowering the funal depth. Since the spray pattern of the 850's is strait and not spread out it works ok even though the length is shorter then 550's. I didn't even consider the o-ring trick. I will probably be about 90% duty cycle on my setup. 1680's require an aftermarket rail, soldering in some diode things and removing the ACV. RC-Engineering told me they could only bore out 550's to 750's so i'm not shure how the previous poster got them larger. You may be fine with 550/1300's or it may be easier and the same amount to bore out your 550's. Check the chart (link) below to see what fuel setup you need for your HP goal.

http://www.turborx7.com/fuelsystem.htm

mono4lamar

iTrader: (32)

i already have the kg parts secondary rail with 1600's... anyway who should i have mill the rail is there someone on the forums that i could send it to and have the funnel depth lowered? whats the best thing to do here? also the injectors i would need would be low impedence injectors correct? should i do the blitz 850's they drop right in as it looks like everyone is stating? one more question lol would i need a different diode for the 1680's (remember i have the 1600's)?

GoRacer

iTrader: (2)

KG kit should be complete with diode things.

I beleive Gotham Racing offers the milling service. Lowering the funel part was done to lower the injector further down inside the rail since it is shorter. I don't know if they offer that as well. Normally the the top where the injectors rest on is shaved down only.

I thought they were high? Check the link I posted. You can get new Blitz, Power Enterprise or Dippon Denso injectors and have them enlarged to 1300's. It is recomend you enlarge new ones.

The diode thing is only for 1600's as they are top feed and different inpodence whatever.

What power are you trying to achieve? You may be fine with 550/1600's. Did you check the chart in the link above?

dhahlen

iTrader: (5)

Your 'diode things' don't happen to be resistors do they? =P

mono4lamar

iTrader: (32)

i dont need 1300's i need 850s... lol does anyone have the part number so i dont mess this up? part numbers for 850's and 1680's would be the end of this thread for me... with my last motor i was just over 90% duty cycle. now i have chris rogers doing a street port and i will be running a bit more boost with this motor. chris and i aggreed that 850's would be a good match. as for gotham doing the milling service im going to find that out and post if they do so hopefully i can help someone else out. thanks again guys!

ronbros3

do they make FD side feed injectors at 1600-1680 cc, or so called 160-168 lbs. in side feeds any body got info. I cant find any any place, it would be nice to find them in a wide spray angle, I know asking a lot! RON

ronbros3

seenin how im asking a lot , 2000cc, wide angle pattern , HA! low impedence 2.5 ohm. betcha there is no such thing on this planet. DARN it hard to go fast. RON

mono4lamar

iTrader: (32)

the 1600's are top feeds... read above.

ronbros3

I got plenty of top feed 1600s, read my thread it says what Im looking for THX Ron. while im here anybody know if the MICROTECH LT8-s will run both HI impedence injectors on the primarys and low impedence on the secondarys with out resistors. THX Ron

BuckyFD3

I wana know more about using the 850 secondarys in the primary rail.

Sesshoumaru

iTrader: (1)

Should be able to.

On the haltech you just have to set the current for the injectors so i would imagine the micro have same option.

mono4lamar

iTrader: (32)

the 850s can go into the primary rail... you have to get the top of the rail milled 1/8 inch to lower the injector to seat... or you use another O-ring to take up the space. so does anyone have any SOLID info to share here? more on the lines of specific part #'s

BuckyFD3

That all you have to do LOL???? Thought there was more to it than that. Perfect then cheers.

ronbros3

well! it sure is an easy fix, took about 15 min. to do. milled exactly .125 thousandths off the top of the primary rail, took the plastic insulator off the 850 injector tip added another O-ring from the old primary 550s put the cover back on with the 2 screws and put the fuel rail back on the engine, all done! I guess in the old days before I had an mill machine I might try grinding the top of the rail, a little rough but it would probably work. Ron

mono4lamar

iTrader: (32)

d hahlen what injectors are you running? where did you get them? if you could pull out a reciept and get me some part numbers i would be very greatful...

AnthonyNYC

iTrader: (3)

I run 1600cc primaries and do not have any issues, never had. Driveability is perfect. I run a TEC3 and stage them accordingly. I've even played with the staging and staged them faster than usual and still had no issues.

1600's in the primary is overkill anyway but I just did them since don't want to run out of injector later on.

Anthony

mono4lamar

iTrader: (32)

yes way overkill lol... im trying to keep it reasonable, like a weekend street car. so 850 primaries are lookin good.