NA Injector Upgrade? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

megamarines · 07-09-2015, 03:38 PM

Hey guys, so I decided on building my motor decently and keep it NA for a while until the warranty dies on me. I do have some questions and ideas, though.

My goal before doing any forced induction would be pulleys, bigger throttle body, maybe a bigger intake manifold, header, radiator, oil cooler, and full exhaust. Obviously if custom tuned, would 400-550cc injectors be too much? I want to maximize efficiency of the motor, but was wondering if injectors would help me with more power if I wanna go beyond the standard 210 of NA.

I rarely work with injectors, but I figured it's worth asking. Any help or details would be great.

DustinS · 07-09-2015, 03:44 PM

You shouldn't need to upgrade injectors for N/A power at all. Even when running E85.

cdrazic93 · 07-09-2015, 03:48 PM

Not really, the stock injectors are fine upto about where avo's turbo kit can get you on low-ish psi. ~260whp. So far i havent seen anyone crack 215 to the wheels NA yet. Hopefully that ultimate NA thread will shine through

DustinS · 07-09-2015, 03:55 PM

Stock injectors are good past that on pump gas. 300whp+?

megamarines · 07-09-2015, 04:09 PM

So it's not worth at all? Would there be any upsides to going with a bigger size or even a basic fuel pump upgrade?

DustinS · 07-09-2015, 04:24 PM

You get to spend money...?

I don't think there is. Not until you go FI. Replacing the pump isn't the easiest thing in the world.

megamarines · 07-09-2015, 04:44 PM

Quote:

Originally Posted by DustinS

You get to spend money...?

I don't think there is. Not until you go FI. Replacing the pump isn't the easiest thing in the world.

Well I'm not looking to /burn/ money, but looking to squeeze out any additional power if I can. If it doesn't help at all then it's really not worth it. I do appreciate the help, though thank you.

Kodename47 · 07-09-2015, 05:48 PM

The car's not down on power due to not being able rich enough. Plus don't forget you have both sets of injectors. You could run almost 100% of the time DI on a NA car without issue. The DI gives you a lot of fueling headroom.

CSG Mike · 07-09-2015, 06:25 PM

There's zero reason to upgrade injectors on a NA car, unless you're doing a V8 swap, or something...

zkv476 · 07-09-2015, 10:28 PM

Injectors are one of those things that allow for more power headroom but provide zero additional power by themselves. Think stuff like axles, forged pistons, rods, valve springs (not counting changed CR and stuff like that.)

swarb · 07-09-2015, 10:52 PM

Out of all the stuff you named, only header, oil cooler, and full exhaust is actually needed to make more power. The rest is pretty useless or is not even out yet.

Andrew025 · 07-09-2015, 10:57 PM

Quote:

Originally Posted by megamarines

Well I'm not looking to /burn/ money, but looking to squeeze out any additional power if I can. If it doesn't help at all then it's really not worth it. I do appreciate the help, though thank you.

You really only need to upgrade injectors if they're maxing out or close to it.
You don't get more power by dumping more fuel in than required.

MaximeT · 07-10-2015, 03:02 AM

Quote:

Originally Posted by swarb

Out of all the stuff you named, only header, oil cooler, and full exhaust is actually needed to make more power. The rest is pretty useless or is not even out yet.

To make power, you need more air, not more fuel.

Like swarb said, header is what you need.

Carlitoz3 · 07-10-2015, 03:14 AM

Quote:

Originally Posted by swarb

Out of all the stuff you named, only header, oil cooler, and full exhaust is actually needed to make more power. The rest is pretty useless or is not even out yet.

How does an oil cooler make more power?

07-09-2015, 03:38 PM	#1
megamarines Senior Member Join Date: Aug 2014 Drives: 2015 FR-S RS 1.0 Location: Walnut Creek, CA Posts: 368 Thanks: 144 Thanked 177 Times in 91 Posts Mentioned: 29 Post(s) Tagged: 2 Thread(s)	NA Injector Upgrade? Hey guys, so I decided on building my motor decently and keep it NA for a while until the warranty dies on me. I do have some questions and ideas, though. My goal before doing any forced induction would be pulleys, bigger throttle body, maybe a bigger intake manifold, header, radiator, oil cooler, and full exhaust. Obviously if custom tuned, would 400-550cc injectors be too much? I want to maximize efficiency of the motor, but was wondering if injectors would help me with more power if I wanna go beyond the standard 210 of NA. I rarely work with injectors, but I figured it's worth asking. Any help or details would be great.

07-09-2015, 03:44 PM	#2
DustinS Senior Member Join Date: Apr 2014 Drives: 2013 Ultramarine FR-S Location: Springfield, MO Posts: 1,948 Thanks: 2,539 Thanked 1,415 Times in 804 Posts Mentioned: 31 Post(s) Tagged: 3 Thread(s)	You shouldn't need to upgrade injectors for N/A power at all. Even when running E85. __________________

07-09-2015, 03:48 PM	#3
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	Not really, the stock injectors are fine upto about where avo's turbo kit can get you on low-ish psi. ~260whp. So far i havent seen anyone crack 215 to the wheels NA yet. Hopefully that ultimate NA thread will shine through __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

07-09-2015, 03:55 PM	#4
DustinS Senior Member Join Date: Apr 2014 Drives: 2013 Ultramarine FR-S Location: Springfield, MO Posts: 1,948 Thanks: 2,539 Thanked 1,415 Times in 804 Posts Mentioned: 31 Post(s) Tagged: 3 Thread(s)	Stock injectors are good past that on pump gas. 300whp+? __________________

07-09-2015, 04:24 PM	#6
DustinS Senior Member Join Date: Apr 2014 Drives: 2013 Ultramarine FR-S Location: Springfield, MO Posts: 1,948 Thanks: 2,539 Thanked 1,415 Times in 804 Posts Mentioned: 31 Post(s) Tagged: 3 Thread(s)	You get to spend money...? I don't think there is. Not until you go FI. Replacing the pump isn't the easiest thing in the world. __________________

07-09-2015, 04:09 PM	#5
megamarines Senior Member Join Date: Aug 2014 Drives: 2015 FR-S RS 1.0 Location: Walnut Creek, CA Posts: 368 Thanks: 144 Thanked 177 Times in 91 Posts Mentioned: 29 Post(s) Tagged: 2 Thread(s)	So it's not worth at all? Would there be any upsides to going with a bigger size or even a basic fuel pump upgrade?

07-09-2015, 05:48 PM	#8
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,629 Times in 1,112 Posts Mentioned: 155 Post(s) Tagged: 1 Thread(s)	The car's not down on power due to not being able rich enough. Plus don't forget you have both sets of injectors. You could run almost 100% of the time DI on a NA car without issue. The DI gives you a lot of fueling headroom. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

07-09-2015, 06:25 PM	#9
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,535 Thanks: 8,927 Thanked 14,181 Times in 6,837 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	There's zero reason to upgrade injectors on a NA car, unless you're doing a V8 swap, or something...

07-09-2015, 10:28 PM	#10
zkv476 Senior Member Join Date: May 2014 Drives: 2014 SWP BRZ, MT Location: New Jersey Posts: 240 Thanks: 11 Thanked 140 Times in 90 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Injectors are one of those things that allow for more power headroom but provide zero additional power by themselves. Think stuff like axles, forged pistons, rods, valve springs (not counting changed CR and stuff like that.) __________________ The answer is racecar. Always.

07-09-2015, 10:52 PM	#11
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,053 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	Out of all the stuff you named, only header, oil cooler, and full exhaust is actually needed to make more power. The rest is pretty useless or is not even out yet.

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