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RS4, RS6 or TTRS injectors on 2.0 TFSI BT ?

A4_DTM Apr 23, 2010

  1. A4_DTM

    A4_DTM Member

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    I'm building BT kit on my car, it will consist of Garrett GT3076R .82 A/R and custom manifold. I'm not shure what injectors to put in it ? If I stay on stock S3, I will probably see 390HP but that is optimistic because my tuner is tuning on MAHA 3000 with very strong load which probably never happens on the road. He is not very happy with RS4 injectors because they don't disperse gas like S3 injectors do. This is test of them on the "table" LINK

    Are there any other injectors that have same impedance as S3 and that they flow more gas at 110 bar ? For example RS6 or TTRS injectors that are designed for turbo engine ?
     
    Last edited: Apr 23, 2010
  2. warren_S5

    warren_S5 Moderator Staff Member Moderator VCDS Map User

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    I thought the S3 injectors were good for nearly 400bhp??

    What kind of power are you looking for in your car?

    There's a bloke on VAGOC whose signature states he has 500bhp but I have no idea what injectors he's running.
     
  3. A4_DTM

    A4_DTM Member

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    Well now it will have about 400hp because I don't want to go over that on stock engine (for now :) )... but I don't want that injectors are working on 99% of their capatibilitys so that is why I would like to install some other injectors
     
  4. KRL

    KRL Member

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    My understanding was that the RS4 injectors should be good. REVO recommend the RS4 and R8 injectors for their stage 3 software on the S3. Here are REVO's HW requirements:
    Required Hardware
    GT3071R Turbo plus installation components
    VAG RS4/R8 spec injectors
    Cold Air intake (from turbo inlet pipe to front of car replacing factory airbox for best gains)
    3.0"Turbo back exhaust without pre-cat and with decat or highflow catalytic convertor (DP comes with turbo kit)
    Uprated or additional Intercooler
    Uprated High Pressure Fuel Pump

    I do not have any experience of the RS4 injectors myself but I know that JonnyC has been running them and not had any issues at silly BHP.
     
  5. KRL

    KRL Member

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    APR do make their own injectors as well which are supplied with their stage 3 kit. They should be good for 500 BHP:

    [​IMG]

    I do not think they are available separately to the stage 3 kit though.
     
  6. akash_sky1

    akash_sky1 Active Member

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    I would have thought injectors designed to run in a forced induction engine such as in TT-RS would be much more suitable. With an engine that has both high compression ratio and pressurized intake I woudn't have thought injectors designed for an N/A would be capable of proper distribution thru more highly pressurized gas.
     
  7. A4_DTM

    A4_DTM Member

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    Just checked with jonnyc, TTRS and RS6 injectors don't fit :(
     
  8. PH1L

    PH1L Gievf Buckets VCDS Map User

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    dans s3 (the vagoc one talked about) is running rs4 injectors with over 500bhp
     
  9. Unitronic

    Unitronic Fear is just a word!

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    The information they shared is not correct.

    RS4 injectors outflow the S3 injectors when testing at the proper fuel pressure. Their junior injector test stand is not capable of testing at the correct operating pressure. The formula they used to calculate the flow rates at the proper pressure is incorrect.

    Unmodified S3 injectors are not capable of flowing as much fuel as the RS4 injectors, therefor your potential to make more power on s3 injectors will be lower than RS4 injectors.


    The RS4 Spray patterns is not perfectly designed for the 2.0T FSI and as such has some side effects. The spray pattern is in no way a benefit and in no way makes it a better option. :s3addict:
     
  10. S3Alex

    S3Alex Rarely neutral Team Ibis Audi S3

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    Thread exhumation!

    I agree that the RS4 injectors at correct pressures are capable of flowing significantly more fuel,and those of us running RS4 injectors with big turbos have found them to be capable of over 500bhp,and probably up to 580bhp before they start to hit the limits,after which you need something like a Stg2 Sorensen manifold with extra injectors and off board ECU.

    For sure also,the spray pattern is not optimal,and this is something that APR used to make much of when bashing them,but depsite that,they do work,and there are few alternatives.
     
  11. grainqey

    grainqey Active Member

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    Holy zombie undead thread resurrection....

    I've been looking at the new 4.0tfsi V8 injectors and TTRS injectors but nobody seems to have any information on the actual flow rate or spray pattern. The TTRS are supposed to flow 30% more than the S3 ones and I'm presuming they are the correct flow which is fine but I can get a set of 8 of the 4.0TFSI injectors which should be plenty based on what VFS on facebook advertise....
    From facebook, VFS - vag fueling solutions supply the new 4.0tfsi injectors for anything from 400-500bhp and TTRS/RS3 from 500bhp upwards

    Does anybody know anything about this?
     
  12. S3Alex

    S3Alex Rarely neutral Team Ibis Audi S3

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    Rick advises using the RS3 injectors if I remember but best to check with him.

    Mine is using a totally different solution now.
     
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  13. grainqey

    grainqey Active Member

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    I'll have to see what Rick says,

    I'm half tempted to swap from my current tuner to Rick when I go big turbo so i'll have to see what he says, not a million miles difference between my current tuner and Rick as I'm only over the woodhead from him!

    Thanks
     
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  14. S3Alex

    S3Alex Rarely neutral Team Ibis Audi S3

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    I think unless you want something like mine then Rick would be an excellent choice.

    He can get the best from the stock ECU and the various injector and LPFP options.

    Otherwise....one word.

    Syvecs.
     
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  15. grainqey

    grainqey Active Member

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    I'd rather stay with the stock ecu but that may end up being a problem depending how mental I go haha!

    I'm only FWD - although my tuner always asks if mine is Quattro when I have dyno runs lol

    I'll drop him a PM about the injectors and see what he says

    Thanks
     
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  16. Rick @ Unicorn Motor Dev.

    Rick @ Unicorn Motor Dev. Site Sponsor Site Sponsor

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    RS3 8V
     
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  17. nil538

    nil538 Active Member

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    Hi what's the difference between 8p rs3 injectors and 8v rs3 injectors?
     
  18. grainqey

    grainqey Active Member

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    Think it's how they fit in the head
     

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