Upgraded injectors?

[BenMTL]

Hey guys, car currently has 95k miles on it, stock injectors/turbo, and APR Stage 1 tune.

However, I have all the parts needed to go Stage 2+, just need to install them and get flashed. I am also planning on getting a bigger turbo over the summer (k04 probably) so am thinking about upgrading my injectors also...Any suggestions? I know S3 is a common option, but where to buy them and are there any better options?

Will upgrade injectors cause problems for while still running Stage 1 software? I fill up with 93 only.

[Denio24]

I would honestly just wait till you have the k04 and the s3 injectors. I'm assuming you will be going with JHM? It is also not a bad option of testing the 2+ tune to make sure you don't have any issues.

You will have to flash a tune when you install the s3 injectors to utilize their full potential; otherwise, you will run rich.

The rs4 injectors have been proven to flow more, but the s3 injectors are the ones you want. 06F906036F is the part number.

[BenMTL]

Thanks for the reply! OK so things would be best if I went like this?

APR Stage 2+ Flash -> some k04 turbo kit + S3 injectors at the same time?

[Denio24]

Yup exactly like that.

[vce1232000]

Any suggestions? I know S3 is a common option, but where to buy them and are there any better options?

S3 injectors are the only option imo The RS4 injectors does not have the correct spray pattern. They are also known to have tune issue's in cold start up. Do a search on them to read the results. This si why most tuners use them and alot of the Bt users select them also

[pat_do]

Hey guys, car currently has 95k miles on it, stock injectors/turbo, and APR Stage 1 tune.

However, I have all the parts needed to go Stage 2+, just need to install them and get flashed. I am also planning on getting a bigger turbo over the summer (k04 probably) so am thinking about upgrading my injectors also...Any suggestions? I know S3 is a common option, but where to buy them and are there any better options?

Will upgrade injectors cause problems for while still running Stage 1 software? I fill up with 93 only.

Jhm or cts kit?

[canadianA4B7]

I've used S3 on k04, GTX 2863, GTX 2867. No issues. suggest water meth even with k04, also suggest buying my 2867 as my price complete is damn near what ull pay for a "k04 kit".... But I like BT.

[rowanta]

So ur gt2867 has the intake manifold? A complete kit? I might b interested?

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[canadianA4B7]

Turbo kit. Send me a PM for details.

Not looking to clutter OP thread about injectors.

[RoguesGambit]

Forget APR, Go JHM, I'm doing that once Im back from Cali

[BenMTL]

Question on this guys...Ultimately switched to JHM (Stage 2). Would it be possible to use the S3 injectors without the k04 turbo? Haven't received it yet....

Would I need to reflash?

[yxri]

Question on this guys...Ultimately switched to JHM (Stage 2). Would it be possible to use the S3 injectors without the k04 turbo? Haven't received it yet....

Would I need to reflash?

Yes but the car will go into limp mode

[BenMTL]

Yes but the car will go into limp mode

Interesting....some people say it will, others say it won't (no specific tune need for just s3 injectors, even with stock ecu or some stage 1 flash it would be OK).

Not sure who to believe at this point

[yxri]

Interesting....some people say it will, others say it won't (no specific tune need for just s3 injectors, even with stock ecu or some stage 1 flash it would be OK).

Not sure who to believe at this point

You will need a tune for the s3 injectors. Don't believe me, try to do a Wide Open Throttle run and see for yourself. People have just not got into boost which allows them to drive the car to the tuner without throwing CEL. I wouldn't recommend if you need to drive more than that for a week.

[Okedokey]

I run my car with S3 injectors, boost fuel system, no probs on a non S3 tune

[RoguesGambit]

Yes but the car will go into limp mode

Good to know.

Better add those to the inevitable Xmas list :P

[yxri]

I run my car with S3 injectors, boost fuel system, no probs on a non S3 tune

Custom tune?

[Okedokey]

Custom tune?

no just stage 2 BSR.

[yxri]

no just stage 2 BSR.

Weird, Many forum members reported that the car would go into limp mode.

[Okedokey]

never been in limp mode and i go wot regularly

[BenMTL]

What is BSR?

[Okedokey]

What is BSR?

https://en.bsr.se/tuning-kits

[Apollo75]

If your doing k04s you'll have to do software again an then you should replace them .


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[Okedokey]

If your doing k04s you'll have to do software again an then you should replace them .


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Huh?

[yxri]

Huh?

Guy must be in the wrong forum...

[EvolutionArmory]

Won't the S3 injectors just spray the amount of fuel requested by the ECU dictated by the tune anyway?

What I'm saying is, just because they can flow about 15% more than our stock injectors can doesn't mean that they do all the time. The injector is still controlled by something else.

Or is this theory totally off?

[Okedokey]

The injectors work in ms, from the ECU, and with higher pressure mods, itll still flow more fuel. You can do it this way, or tune the car properly and get better efficiency via mods to injector pulse time and pressure. Either way, they work fine (albeit rich) in a stock tune. The trick is to get the air in.

[yxri]

The injectors work in ms, from the ECU, and with higher pressure mods, itll still flow more fuel. You can do it this way, or tune the car properly and get better efficiency via mods to injector pulse time and pressure. Either way, they work fine (albeit rich) in a stock tune. The trick is to get the air in.

Reading back I assumed he was going to have the ko4 on the stage 2 tune. which will distort the air flow and cause a CEL.

[canadianA4B7]

Won't the S3 injectors just spray the amount of fuel requested by the ECU dictated by the tune anyway?

What I'm saying is, just because they can flow about 15% more than our stock injectors can doesn't mean that they do all the time. The injector is still controlled by something else.

Or is this theory totally off?

I think your right S3 injectors on a lesser tune or turbo car will run. I believe jameslucy runs this now on his stage 2 tune on oem turbo. I logged his car last year and his injector corrections were nothing out of the ordinary.

[EvolutionArmory]

Reading back I assumed he was going to have the ko4 on the stage 2 tune. which will distort the air flow and cause a CEL.

You are dead right about this. I had to run my K04 on a stage 2 tune for 2 weeks. Limp mode every other day. Had to take it easy and make sure I was always in the right gear to get speed with partial throttle.

It's just we're talking about something else this time 😀

[canadianA4B7]

$310 usd plus shipping and fees. Best I'll do here there listed else where for a lot more.

[EvolutionArmory]

50% off a used part set based on condition is more than fair. The OP should snap these up. The parts are good and the seller is solid.

[canadianA4B7]

Ya I think they ran 1000 miles. So they're new condition and install ready.

Thanks mate appreciate the comment.

[BenMTL]

Are those S3 injectors?

[canadianA4B7]

Are those S3 injectors?

Correct sir. Part number 06F 906 036 F. Buy from a Canadian brother, clearly a better deal then classifieds. And likely a bit less shipping from Kingston area to MTL (Montreal)?

[StatusQuo]

If you run S3 injectors on a tune for stock injectors, the car can still run. What will happen is the ecm will see the car is running rich and progressively start pulling fueling via o2 correction. However, there is a limitation with this correction.

You will run into a problem where your o2 correction is already way off optimal values on the stock injectors. Adding S3 injectors will compound the problem.

The S3 and stock injectors behave the same. So using the stock firing angles and injection times can get the car to run.


Ideally you want to zero out the o2 correction in your tuning so it can compensate for bad situations as needed.


The stock ecm can correct for ±50% of fuel total.

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