Fuel injector types - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

holybushoffire · 01-13-2008, 08:25 PM

Alright I have a question about fuel injector options.

I searched the first four of 70+ pages using "fuel injector" as a keyword and didn't turn up much.

It's a pretty straightforward question.

What is the advantage/disadvantage to top-feed over side-feed injectors?

The reason I'm asking is because I recently obtained on an HKS anodized top-feed fuel rail. And I need to figure out whether to keep it or not. (not meaning I'm ready to install, just for future upgrades.)

Thanks in advance.

Goldeneye9mm · 01-13-2008, 08:42 PM

well the biggest reason for top feed is the vast options and cost difference. say a 550cc injector. you could easly get both top or side feed but you have less options in side feed and you're gonna pay close to twice the price and you may only find 3 different types but in top feed you may have 30. if you have an s13 motor than keep the rail s14 sr20det's (which i unfortunatly have in this case) you have to use a different intake manifold b/c of clearance issues. so in my case i'm looking for a set of used sid feeders. thats about it.

nicku · 01-13-2008, 10:52 PM

so if I have stock s13 sr fuel rail and intake manifold, should I look for side feed or top feed? cz im thinking to get my friend's wrx's injectors

nissan240sxkid · 01-13-2008, 11:07 PM

well if you getting your friends wrx then your decision is made.....if you go top feed injectors are cheaper but that might be offset by the price of the fittings for the rail or the rail itself if you dont have one and a fpr and lines, braided ones at least for the look....

nicku · 01-14-2008, 02:00 PM

so you saying as long as i get the side feed, i will be fine with the stock fuel rail and fpr set up?

*MELLO*SOS* · 01-14-2008, 02:39 PM

its like 5 lug vs 4 lug... More options & a little cheaper...

Mechanically speaking I don't think there's much advantage to one vs the other.

01-13-2008, 08:25 PM	#1
holybushoffire Zilvia Junkie Join Date: Jul 2005 Location: NorCal Posts: 580 Trader Rating: (5) Feedback Score: 5 reviews	Fuel injector types Alright I have a question about fuel injector options. I searched the first four of 70+ pages using "fuel injector" as a keyword and didn't turn up much. It's a pretty straightforward question. What is the advantage/disadvantage to top-feed over side-feed injectors? The reason I'm asking is because I recently obtained on an HKS anodized top-feed fuel rail. And I need to figure out whether to keep it or not. (not meaning I'm ready to install, just for future upgrades.) Thanks in advance. __________________ "I am not good English, I like the drift" CHINA DRIFT "some guys have a better relationship with their car than their wife haha. sad but true." SECRET SOCIETY

01-13-2008, 08:42 PM	#2
Goldeneye9mm Zilvia Member Join Date: Oct 2007 Location: Baltimore, Maryland Age: 39 Posts: 173 Trader Rating: (2) Feedback Score: 2 reviews	well the biggest reason for top feed is the vast options and cost difference. say a 550cc injector. you could easly get both top or side feed but you have less options in side feed and you're gonna pay close to twice the price and you may only find 3 different types but in top feed you may have 30. if you have an s13 motor than keep the rail s14 sr20det's (which i unfortunatly have in this case) you have to use a different intake manifold b/c of clearance issues. so in my case i'm looking for a set of used sid feeders. thats about it.

01-13-2008, 10:52 PM	#3
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	so if I have stock s13 sr fuel rail and intake manifold, should I look for side feed or top feed? cz im thinking to get my friend's wrx's injectors

01-13-2008, 11:07 PM	#4
nissan240sxkid Zilvia Member Join Date: Jun 2005 Location: NJ Posts: 211 Trader Rating: (5) Feedback Score: 5 reviews	well if you getting your friends wrx then your decision is made.....if you go top feed injectors are cheaper but that might be offset by the price of the fittings for the rail or the rail itself if you dont have one and a fpr and lines, braided ones at least for the look....

01-14-2008, 02:00 PM	#5
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	so you saying as long as i get the side feed, i will be fine with the stock fuel rail and fpr set up?

01-14-2008, 02:39 PM	#6
MELLOSOS* LAID OUT Join Date: Mar 2004 Location: LAS VEGAS Age: 43 Posts: 2,015 Trader Rating: (1) Rides Gallery: MELLO*SOS Feedback Score: 1 reviews	its like 5 lug vs 4 lug... More options & a little cheaper... Mechanically speaking I don't think there's much advantage to one vs the other.