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Old 03-30-2009, 12:48 AM   #1
suberdave
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Join Date: Nov 2005
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88 GL-10 STi
silver

Default injectors? how big is to big

i need to get new injectors again. i am maxxing out the STI sidefeed injectors on my setup.

i just called witch hunter injectors, they have a few sets of injectors i could get. from 776cc up to 832cc. is it going to matter if i get a little to big?

i will be going larger displacement soon, dont want to have to get a new set again when i do it.

if i get the larger injectors will they be to big?

i am running ViPEC for EM so i can scale down the injectors. so i dont think that will be a problem...

-=Suberdave=-
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Old 03-30-2009, 01:19 AM   #2
supasweetr34skyline
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Location: Greenville, SC
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Aiming for 10's

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I wouldnt worry about injectors being too big these days because of how technology has improved. always leave room to improve. At this point, you might want to consider along with your larger injectors is a swirl pot.. here is a forum link with research to the new bosh injectors i personally plan on running here in the near future! They are insane! flows/sprays flawless with over 100psi of fuel preassure.

http://forums.nasioc.com/forums/show....php?t=1702099

good luck with your decision! i cant wait untill the time i get these
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Old 03-30-2009, 10:30 AM   #3
blkgm8
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Suberdave... I call dibs on the sti sidefeeds if you sell them.

So you moving up into the serious power now eh... I got my eye on you! lol

I got some top secret stuff going on over here as well will reveal soon. Muahahahahaa...... (My evil laugh)
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Old 03-30-2009, 04:25 PM   #4
dscoobydoo
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How about posting what you have and what size you are using now. While having room up top is always good, you CAN actually put in too large of an injector. this equates to a harder tune because you can't fine tune as well on the larger injectors.

I might get a few NOT! posts, but think about it mathematically: when you tune, you are scaling everything. thus, the smaller number you use to scale, the better the reference value is.
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Old 03-30-2009, 10:31 PM   #5
suberdave
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Quote:
Originally Posted by blkgm8 View Post
Suberdave... I call dibs on the sti sidefeeds if you sell them.

So you moving up into the serious power now eh... I got my eye on you! lol

I got some top secret stuff going on over here as well will reveal soon. Muahahahahaa...... (My evil laugh)
i will not be saleing the sidefeeds. i will be haveing them modded by witch hunter injector. unless you will pay me more than $160 because that is what they will give me for them.




Quote:
Originally Posted by dscoobydoo View Post
How about posting what you have and what size you are using now. While having room up top is always good, you CAN actually put in too large of an injector. this equates to a harder tune because you can't fine tune as well on the larger injectors.

I might get a few NOT! posts, but think about it mathematically: when you tune, you are scaling everything. thus, the smaller number you use to scale, the better the reference value is.

right now i have stock Yellow top STI sidefeeds. said to be 550ish cc

I am running a 96 EJ20G with FMIC, TDO5h 16g, full 3" turbo back, and tuned with the ViPEC ECU.

i was maxing out the 440's so i got the 550's and now i am maxing them out too.

-=Suberdave=-
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Old 03-31-2009, 12:27 PM   #6
Jaxx
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do they mod the injectors or sell you 4 matched injectors and buy your 550s as cores?
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Old 03-31-2009, 10:31 PM   #7
suberdave
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Quote:
Originally Posted by Jaxx View Post
do they mod the injectors or sell you 4 matched injectors and buy your 550s as cores?
copy from there sight...

http://www.witchhunter.com/

We sell 1% flow matched sets of these side-feeds for $410 per set of four, shipped. Please call for availability.
These sets are ready to install, and come complete with test data. You can send back your stock injectors for $160 refund.

-=Suberdave=-
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Old 04-05-2009, 05:28 PM   #8
eK24monster
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Pick the injector based on the power you plan on making at the end of the day.

We have people come in and buy injectors two or three times before they are done because they are never satisfied. They loose their asses when they try to resale.
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Old 04-12-2009, 06:15 PM   #9
suberdave
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i went with the 780CC injectors, they seam to be just fine.

car is running perfict AFR with 70%DC at WOT at red line.

leaves plenty of room for upgrades.

-=Suberdave=-
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Old 04-13-2009, 03:17 AM   #10
ozdewiz
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Location: Tha shack down tha back, Oz
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WRC Blue w/- Red Metallic

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Hi from Oz(tralia)
I had my set of 550 sidefeeds opened out (Flowed?) by a local sooby specialist when I needed some more fuel through my forged 2 litre to make over 250Kw

When he started they were flowing between 546 & 553cc
I'm more than happy now with all of them running exactly 672cc/min
I've (actually, my tuner, Lincoln) got my AFR's running exactly 11.5-1 & the only problem is a little backfiring on trailing throttle which Linc will, hopefully, tune out next time he has his hands on Bertha (My GC8)

Saved me buying extra injectors (which then sell for WAY less) when I don't need them

Cheers guys
Oz - Jim

Last edited by ozdewiz; 04-13-2009 at 03:22 AM.
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Old 04-13-2009, 06:04 PM   #11
1995REX
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FOR SALE!!!!

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since were on the injector topic if i put a set of STi injectors in my WRX will that give me anything or just a waste of money by the way its a 95 GC8C,EJ20
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