Larger Injectors For Forced Induction

[Maxx Mazda]

I just looked at some old pics, and the stock rail and mani does have 4 bolts, but my 626 mani and the Perrin rail both have only 2 bolts.

 

[03.5MSP]

Yeah I looked at pics of my stock mani and it had 4 bolt holes for the fuel rail.

Also Steve, I AM using two spacers that were provided with the NSN kit, so after looking at it today again they sit nice and tight just not at the same angle as oem. They have been treating me great so far so im just sticking with them. Plus they are low impedance and thats a plus.

oh and this is my 1000 post so WOOOOOOOOOOOOOOOOHHHHHHHHHHHHHOOOOOOOO!!!!

 

[mazdaspeedwerx]

are we talking about spacers for the fuel rail to mount onto a 626 mani properly? is so where can you get them?

 

[Maxx Mazda]

are we talking about spacers for the fuel rail to mount onto a 626 mani properly? is so where can you get them?

No the stock spacers work perfect.

 

[mspeedP5]

Best price I've found on the 565cc's

https://www.subarugenuineparts.com/advanced_search_result.php?keywords=injectors&x=19&y=9

Nice!!!

 

[KZL_99ES]

quick question...would it be acceptable to put in 440's with still an oem ecu?

i'm going to no on this...but i'm also no expert, that's why i want you peoples' opinions!

Thanks!
~Kevin

 

[mspHtown]

quick question...would it be acceptable to put in 440's with still an oem ecu?

i'm going to no on this...but i'm also no expert, that's why i want you peoples' opinions!

Thanks!
~Kevin

yes if you have a way to control them.
no if you dont have engine management.

 

[KZL_99ES]

^^^ alright, thanks, that's kinda what i thought...i'll wait until the unichip goes in (its programed for the 440's)

thanks again!

 

[shane02pro5]

Bump for anyone who has machined injectors for more flow. I am out of fuel and am considering modifying my 565cc to flow 800cc+. I just want to know whether this has a significant dribble effect at low rpms and idle vs. actually using a larger injector.

I know perrin has a service where they take stock sti 550's and modify and flow test them to over 816cc.

 

[Maxx Mazda]

Bump for anyone who has machined injectors for more flow. I am out of fuel and am considering modifying my 565cc to flow 800cc+. I just want to know whether this has a significant dribble effect at low rpms and idle vs. actually using a larger injector.

I know perrin has a service where they take stock sti 550's and modify and flow test them to over 816cc.

It's WAY cheaper to just by the drop in 900cc's. And how are you out of room on the injectors man? I can hit 30psi on my giant T4 with the Sti's and they're not quite maxed out...

 

[TurfBurn]

Have you thought about running an upstream fuel rail instead? You get cooling benefits as well as the ability to run a lot more injector with minimal impact. Not sure on your EMS though.

 

[shane02pro5]

22psi I see 100% here and there and cold mornings 3rd gear and up 100%.
I'm back to 20psi and still certain times of the day see in the 90%.

It would be free for me to modify them myself since I have a machine shop.

I'm not sure what I'd have to do or if I can setup an additional fuel rail with my antique F10A alongside my j&s. Plus I have my tune sooo perfect right now i hate to have to jack with it in the first place.

It's better to just have to scale around sections of fuel maps rather than starting from scratch with a different injector setup.

 

[mspHtown]

Not telling you to get the extra injectors, but from your logic it seems the extra rail would be the easiest to tune.

If you get larger injectors, u will have to retune all your maps. Idle, partial throttle, full throttle, etc.

If you use additional injectors and have them fire only at high loads, then you do not have to retune your partial throttle and idle maps, just the heavy load cells.

I dont know if your unit can handle extra injectors and in the end, it may not be the route you want to go.

22psi I see 100% here and there and cold mornings 3rd gear and up 100%.
I'm back to 20psi and still certain times of the day see in the 90%.

It would be free for me to modify them myself since I have a machine shop.

I'm not sure what I'd have to do or if I can setup an additional fuel rail with my antique F10A alongside my j&s. Plus I have my tune sooo perfect right now i hate to have to jack with it in the first place.

It's better to just have to scale around sections of fuel maps rather than starting from scratch with a different injector setup.

 

[shane02pro5]

I don't think my f10a has the capabilities. This sucks because I certainly am not turning down the boost anytime soon.

At least I got all my practice out of the way by converting my maps from a 2bar to a 3bar sensor and then swapping my 280's to 565's.

 

[kz9]

I have modified Wrx's that flow 740cc. I noticed when they were in that i couldn't control them that well at idle. Now this is with just an E-manage, so you standalone guys could mess with the duration to help this. Me I am just going to opt for running 2 of the 740cc injectors because the E-manage can do only that. 565cc is the most that the E-manage can do.

 

[subarutechnica]

More boost= More air

More air= More gas to burn

More gas burn= FUN!!!!!!!!

 

[shane02pro5]

RC750's on the way which is a bit more than what I need right now but I'll bump my vf-22 up to 22psi and still have some room for when I swap in a gt3071.

I'll be selling my new 565cc's (4k miles) for $300 once I swap them out.

 

[Thefriar]

also www.corksport.com sells injectors specifically made for proteges that range all the way up to 800cc if you guys are interested


http://www.corksport.com/deatschwerks-mazdaspeed-protege-fuel-injector-set.html

 

[mspeedP5]

deatschwerks FTW!!!

 

[nvmsp]

when you buy new injector's, do you have to buy anything else when installing them or no?