16v injector swap

[kingcorolla]

jus thinkn about ugrading my fuel system, for my NA 4age. Been told 3s-gte injectors are appropriate, now if i go with the swap, would i need the 3s fuel rail aswell for increased pressure? or would just 3s injectors do fine with factory pressure, just more flow??

Or does anyone know of a good reliable setups i could think about?

[kingcorolla]

dont make me bump this shitt...

[Akane]

The stock rail should flow enough to exceed the 3S-GTE injector's specs, I have a set for sale, $200, $250 with 3S-GTE fuel rail and FPR.

[kingcorolla]

ill keep the offer in mind,
but what i want to know is, factory rail/FPR got factory pressure, would swapping JUST the injectors be fine, which would result in more flow, or would a pressure INCREASE be required as well for maximim gains?

(and dont say i need the rail aswell only coz u want some cash.)

[Drifter4ag]

stock 4age injectors are good for over 200hp and the fuel rail we have tested at almost 300hp

[kingcorolla]

straight up! cheers

[Akane]

the stock rail on 3S-GTE is good for 450hp+ and stock injectors are good for 330hp+

It's up to you if you want the rail or not, I ain't fussed at all.

[ants_ae92]

It is not a matter of pumping as much fuel into the car as possible it is whether your car needs that fuel. If you pump too much fuel into the car it will run too rich and will not make as much power as a car that has been tuned to put in the right amount of fuel.

Until you run the car and test its air/fuel ratio you will not know whether you need it.

A perfect example of this was a few months back when me and a mates car hit the dyno. I wanted a benchmark before I started modifying my N/A 4age. I got 76kw at the front wheels in my 16v, and a mates 20v running mega rich only made 80kw. His air fuel ratio was like 10:1 and mine was around 12.5:1. He straightened his a/f ratio and now he is back around 90 kw.

The 20v uses 290cc per minute with the same fuel pressure as the 16v, and the red top small port uses 235cc injectors with a slighlty higher fuel pressure.

For your N/A car it shouldnt need any more than these unless you are running some crazy cam profiles or a turbo!

An easier way would be to increase you fpr if it needs it, or swap for red top injectors(small port).

[TotemoAW11]

or swap for red top injectors(small port).

but the impedence is different on the small port (2ohm) will they still just swap in?

[TotemoAW11]

ok now im really confused:
just tested the impedence accross my injectors (reb/black top tvis) and it was 3.5ohm on all of them
Then tested my set of mystery injectors (green plugs on them - anyone know?) and the resistance was 14.1ohms.......

wtf
I tried searching too, but it seems that the impact impedence of different injectors hasn't been discussed, is it a 'grey area' that no one knows anything about or somthing?

[Ae92typeX]

incorrect impedance can fully stuff up an ecu. I think you can go either from high to low or the other way round, but not the reverse.
Cant recall exactly but its been discussed on the supra forum many times.

[ants_ae92]

Small port injectors are still comsidered low impedance. The best advice on this I can give you is to look up the club 4ag site. There are many guys who have done this, small port 235cc injectors on there cars, with other mods of course. No ecus fried in there cars, and it is quite a common swap.

www.club4ag.com

There is a thread on redtop injectors with a blue top ecu. But the same would still apply to a redtop tvis with redtop(small port) injectors

[kp_drifta]

would small port red top injectors support running a turbo at say around 14psi with a redtop block, gze bottom end etc

[ants_ae92]

I'd say you'd be better off running 365cc gze injectors. As some people with the 4agze run smaller s/c pulleys to get this kind of boost