APR high flow fsi injectors

[ESadowski72]

https://www.uspmotorsports.com/APR-H...Injectors.html

Anybody ever use these or heard of them? I'm always searching and dreaming about my next setup and 500+hp would be my goal. As well as a setup that is simple and somewhat developed. I know there has been a few threads about the limited injector options our platform has available but I have never seen these mentioned. Nor have i seen many setups actually making power in that range. Interested in some input.

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[tloft4]

arent those just s3 injectors? 13% more than stock (k03)?

[ESadowski72]

Now that I actually read the description correcetly looks like these are just S3 injectors made by apr or the ones offered in their k04 kit? I'm confused? I already have S3 injectors so looks to me like these wouldn't be much of an upgrade lol.

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[ESadowski72]

Ya I read the description wrong I believe. I read it as 13% larger then k04 injectors...

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[EvolutionArmory]

That’s correct. APR injectors are the same as S3.

S3 injectors are the most reliable injector we have for 400 HP and down.

Above that, there are very few options but a couple guys are playing around with modern GM injectors with some success.

[canadianA4B7]

Injectors for our platform are available up to 748 hp. Just need open up your search to the UK and you’ll find all kinds of options.

[EvolutionArmory]

Injectors for our platform are available up to 748 hp. Just need open up your search to the UK and you’ll find all kinds of options.

Your last post in the injector megathread is well over a year old. Did you ever get Gen 2 RS4 njectors to run right?

[EvolutionArmory]

And did anyone ever confirm that newer DI injectors that take 12 amps to open fully will run right with an ECU sending 6 amps?

[james12lucy]

My two cents, for what they’re worth...

RS4 injectors, tune to about 85% duty cycle at max RPM. Then add port injection (either 4x small injectors or 1x large) with secondary injection control (034 EFI) and tune those injectors to pick up the slack based on AFR.

Canadian is right about looking at Europe. There are some great options, but cost prohibitive. The Gen 2 RS4 injectors ended up going to an MK6 owner. I might get them back and make a harness, or just go with option 1 from my first paragraph. Tuning wouldn’t be too hard.


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