Quick injector question

[TRD_ZERO]

Im wanting bigger injectors for my blacktop once it is 4agte. I dont know much about injectors but these seem like they are side feed so what are my options on going bigger (not really wanting aftermarket items unless cheap)?

[escortman]

depends how big u wanna go but factory ze 1s 365cc or evo 510cc plus rx7 550ccs

[TRD_ZERO]

Im wanting minimum 550cc but what are my options in terms of side feed im i correct in saying blacktop ones are sidefed and i need sidefed ones to replace them? Are 3sgte ones side feed and what cc rating? arent evo ones 550 but arnt they top feed.

[Boosted_162]

Im wanting minimum 550cc but what are my options in terms of side feed im i correct in saying blacktop ones are sidefed and i need sidefed ones to replace them? Are 3sgte ones side feed and what cc rating? arent evo ones 550 but arnt they top feed.

Gen 2 3SGTE = 440cc side feed. Gen 3 3SGTE = 540cc side feed. Gen 1 (ST165) and gen 4 (ST215 GTT) are both top feed afaik.

[TRD_ZERO]

Nice info thanks so how do you tell the difference between the Gen 2 and Gen 3 colour/numbers what would i be looking for if i wanted the gen 3's?

[AceSniper]

black 3sgte side feeds are 440's there is some 550's that are side feed in some 2jzgte's? not sure on colour

[Boosted_162]

black 3sgte side feeds are 440's there is some 550's that are side feed in some 2jzgte's? not sure on colour

US spec 2JZGTEs isnt it? Pretty sure you can get them new through toyota as well.

[method]

I thought blacktops are topfed?

Evo 1-4 are 510cc evo 5 - 8 are 550cc, just like the rx7 ones. All top fed

[IH8TEC]

they are sidefeed, you can get brand new sard 800's for around the $600 range.

[TRD_ZERO]

Oh ok then 600 isnt expensive just a little out of my budget plus a bit overkill. I might try hunt down some 3sgte ones gen 3's

[Akane]

Gen 2 3S-GTE: Black
Gen 3 3S-GTE: Red/Brownish
USDM 2 Jay'Z: Indigo (Fancy word for the metro sky blue)

I have a set of USDM 2JZ-GTE 550cc side feed, want $300 for them if you are keen.

One thing with injectors is you don't want to go too big. Or else your computer will have problems with controlling them at idle.

You still want a fine mist of gasoline, not flood the chambers with huge droplets.

[method]

One thing with injectors is you don't want to go too big. Or else your computer will have problems with controlling them at idle.

You still want a fine mist of gasoline, not flood the chambers with huge droplets.

Why would there be huge droplets?

[matt dunn]

One thing with injectors is you don't want to go too big. Or else your computer will have problems with controlling them at idle.

You still want a fine mist of gasoline, not flood the chambers with huge droplets.

Why would there be huge droplets?

there is a minimum pulse width that is required to actually get an injector to open.

With injectors too large, the amount of fuel injected may be too much for the engine,
and large injectors have trouble with a good spray pattern at really small pulse widths.

In saying that, the 800's in my 20v idle fine,

But for the MRS we are going to run 8 smaller injectors in staged sequence,
as 4 900cc injectors may be a bit much at idle for a less than 1300cc engine.

[method]

One thing with injectors is you don't want to go too big. Or else your computer will have problems with controlling them at idle.

You still want a fine mist of gasoline, not flood the chambers with huge droplets.

Why would there be huge droplets?

there is a minimum pulse width that is required to actually get an injector to open.

With injectors too large, the amount of fuel injected may be too much for the engine,
and large injectors have trouble with a good spray pattern at really small pulse widths.

In saying that, the 800's in my 20v idle fine,

But for the MRS we are going to run 8 smaller injectors in staged sequence,
as 4 900cc injectors may be a bit much at idle for a less than 1300cc engine.

Cheers for that, i was always wondering why people run a second set of medium sized injectors instead of larger injectors =.

[matt dunn]

Cheers for that, i was always wondering why people run a second set of medium sized injectors instead of larger injectors =.

And also because we already have 8 440cc injectors that came out of
dad's GT40, lol,
they were to big for that, yet we will need all 8 of them on a motorcycle engine.