Injector choices for GT2871R .64... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Seraphim38 · 12-02-2010, 10:13 AM

Question: I am upgrading cams and head gasket and am wondering what I should do about injectors...

- Should I just buy some side feed 740cc injectors and run the stock rail
- Should I consider buying a JWT top feed fuel rail with STi top feed injectors (will they work?)

There's a reputable local company that sells injectors on an exchange basis, which makes it very affordable. They offer them with the documentation for the flow matching and modifications...

Injectors : Kito Auto Sport Online Store

Context: (Current configuration)
Stock internals 94-96 S13 Blacktop SR20DET
Megan bottom mount manifold
7 layer exhaust gasket, nord locks, copper lock nuts and stainless studs
New GT2871R .64 AR
Apexi suction kit for 2871/z32 MAF
z32 MAF
Enthalpy tuned ECU
Stock intake manifold, TB
STi 550cc injectors
Greddy Elbow
Greddy downpipe and 3" Invidia catback
Greddy FMIC
Greddy BOV

Next week I will be adding:
Reworked head with 3 angle valve job
New Greddy springs
New Brian Crower Titanium retainers
New BC 264 12.00MM lift cams
Stock cam gears
New Aeromotive 13109 FPR
New Tomei -6AN adapter to stock fuel rail
New Push-lock Aeroquip -6 AN lines

Yet to buy:
Apexi 87x0.8 metal head gasket
ARP head studs
Intake and other gaskets

Advice?

Prok0 · 12-04-2010, 11:56 AM

I'd just do 740s in a stock rail, less shit to change, less headache, no real benefit of going top feed.

Also, you may want to invest in some better cams, or cam gears. BC cams are generally off the centerline compared to the cam card, so they need to be degreed in to make the most power, and with the money/time your spending on cam gears and degreeing them in you could probably just get some good JWT or Tomei cams.

Seraphim38 · 12-04-2010, 12:12 PM

I got a deal on the head with Greddy springs, BC cams & retainers, valve job all done already. I was planning on JWT, Tomei or HKS stage 2s but the deal on the head was too good to pass up.

Thanks for responding to the thread. I am guessing that most people would say to stay with the stock rail and buy some flow matched 740 side mounts...

homeslicej2 · 12-04-2010, 12:23 PM

I'd order Mazworx's headstud kit. It's still ARP material, just made to their length specs for the RWD SR20DET & are only a bit more the ARP's kit. Mazworx's ones seat fully into the block. Check out their website for a comparasion.

jspaeth · 12-05-2010, 01:41 PM

I am running Tomei 740s and they seem to work just fine.

nismoman · 12-05-2010, 02:12 PM

+1 for 740 sidefeeds

Def · 12-06-2010, 09:34 AM

Get 740 cc injectors. I was maxing out my 525 cc STi sidefeeds pretty easily.

Sasquatch13 · 12-06-2010, 09:57 AM

My friend took his sr20det too Jeff Evans he had nismo 740's and jim wolf c1 cams. His injectors where maxed out at 380rwhp / 330tq. Car is sick nasty fast, but Jeff Evans said top feed injectors is more efficient an that he could squese more power out if he had top feed. Plus they are cheaper ( the injectors them self not so much converting over the fuel rail ).

If your not planning on going super high power like over 400rwhp then I would just stay side feed. Hope this helps!

s14freak93901 · 12-06-2010, 10:04 AM

go for 740's. maybe one day when you decide to go larger you don't needa get another set of injectors.

Seraphim38 · 12-06-2010, 10:25 AM

I just bought an HKS top feed rail from another board member and am going to get some 740 or 800 top feeds. I know that the top feed rail isn't necessary, but I don't want to buy side feeds now and have to upgrade to top feeds later; I would rather buy the better unit now and not have to replace it later.

Thank you all for your responses, and I will definitely be buying the Mazworks head stud kit...thank you for that feedback as well.

12-02-2010, 10:13 AM	#1
Seraphim38 Zilvia Addict Join Date: Oct 2010 Location: Washington Posts: 810 Trader Rating: (6) Feedback Score: 6 reviews	Injector choices for GT2871R .64... Question: I am upgrading cams and head gasket and am wondering what I should do about injectors... - Should I just buy some side feed 740cc injectors and run the stock rail - Should I consider buying a JWT top feed fuel rail with STi top feed injectors (will they work?) There's a reputable local company that sells injectors on an exchange basis, which makes it very affordable. They offer them with the documentation for the flow matching and modifications... Injectors : Kito Auto Sport Online Store Context: (Current configuration) Stock internals 94-96 S13 Blacktop SR20DET Megan bottom mount manifold 7 layer exhaust gasket, nord locks, copper lock nuts and stainless studs New GT2871R .64 AR Apexi suction kit for 2871/z32 MAF z32 MAF Enthalpy tuned ECU Stock intake manifold, TB STi 550cc injectors Greddy Elbow Greddy downpipe and 3" Invidia catback Greddy FMIC Greddy BOV Next week I will be adding: Reworked head with 3 angle valve job New Greddy springs New Brian Crower Titanium retainers New BC 264 12.00MM lift cams Stock cam gears New Aeromotive 13109 FPR New Tomei -6AN adapter to stock fuel rail New Push-lock Aeroquip -6 AN lines Yet to buy: Apexi 87x0.8 metal head gasket ARP head studs Intake and other gaskets Advice?

12-05-2010, 01:41 PM	#5
jspaeth Nissanaholic! Join Date: Mar 2006 Location: Philadelphia suburbs Age: 40 Posts: 2,347 Trader Rating: (7) Rides Gallery: jspaeth Feedback Score: 7 reviews	I am running Tomei 740s and they seem to work just fine. __________________ Daily driven

12-05-2010, 02:12 PM	#6
nismoman Zilvia Junkie Join Date: Jul 2005 Location: Bowie, MD Posts: 412 Trader Rating: (0) Feedback Score: 0 reviews	+1 for 740 sidefeeds __________________

12-06-2010, 09:34 AM	#7
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	Get 740 cc injectors. I was maxing out my 525 cc STi sidefeeds pretty easily. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

12-04-2010, 11:56 AM	#2
Prok0 Zilvia Junkie Join Date: Apr 2003 Location: FL Age: 38 Posts: 376 Trader Rating: (0) Feedback Score: 0 reviews	I'd just do 740s in a stock rail, less shit to change, less headache, no real benefit of going top feed. Also, you may want to invest in some better cams, or cam gears. BC cams are generally off the centerline compared to the cam card, so they need to be degreed in to make the most power, and with the money/time your spending on cam gears and degreeing them in you could probably just get some good JWT or Tomei cams.

12-04-2010, 12:12 PM	#3
Seraphim38 Zilvia Addict Join Date: Oct 2010 Location: Washington Posts: 810 Trader Rating: (6) Feedback Score: 6 reviews	I got a deal on the head with Greddy springs, BC cams & retainers, valve job all done already. I was planning on JWT, Tomei or HKS stage 2s but the deal on the head was too good to pass up. Thanks for responding to the thread. I am guessing that most people would say to stay with the stock rail and buy some flow matched 740 side mounts...

12-04-2010, 12:23 PM	#4
homeslicej2 Zilvia Member Join Date: Aug 2008 Location: Adairsville, GA Age: 41 Posts: 152 Trader Rating: (0) Feedback Score: 0 reviews	I'd order Mazworx's headstud kit. It's still ARP material, just made to their length specs for the RWD SR20DET & are only a bit more the ARP's kit. Mazworx's ones seat fully into the block. Check out their website for a comparasion.

12-06-2010, 09:57 AM	#8
Sasquatch13 Join Date: Nov 2010 Location: New Bern NC Age: 37 Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	My friend took his sr20det too Jeff Evans he had nismo 740's and jim wolf c1 cams. His injectors where maxed out at 380rwhp / 330tq. Car is sick nasty fast, but Jeff Evans said top feed injectors is more efficient an that he could squese more power out if he had top feed. Plus they are cheaper ( the injectors them self not so much converting over the fuel rail ). If your not planning on going super high power like over 400rwhp then I would just stay side feed. Hope this helps!

12-06-2010, 10:04 AM	#9
s14freak93901 Zilvia Member Join Date: Apr 2005 Location: salinas,ca-fort bragg,nc Age: 36 Posts: 203 Trader Rating: (0) Feedback Score: 0 reviews	go for 740's. maybe one day when you decide to go larger you don't needa get another set of injectors.

12-06-2010, 10:25 AM	#10
Seraphim38 Zilvia Addict Join Date: Oct 2010 Location: Washington Posts: 810 Trader Rating: (6) Feedback Score: 6 reviews	I just bought an HKS top feed rail from another board member and am going to get some 740 or 800 top feeds. I know that the top feed rail isn't necessary, but I don't want to buy side feeds now and have to upgrade to top feeds later; I would rather buy the better unit now and not have to replace it later. Thank you all for your responses, and I will definitely be buying the Mazworks head stud kit...thank you for that feedback as well.