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RS4, RS6 or TTRS injectors on 2.0 TFSI BT ?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by A4_DTM, Apr 23, 2010.

  1. A4_DTM
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    A4_DTM Member

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    [Apr 23, 2010]
    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
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  3. warren_S5
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    warren_S5 Moderator Staff Member Moderator VCDS Map User

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    [Apr 23, 2010]
    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.
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  4. A4_DTM
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    A4_DTM Member

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    [Apr 23, 2010]
    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
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  5. KRL
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    KRL Member

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    [Apr 23, 2010]
    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.
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  6. KRL
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    KRL Member

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    [Apr 23, 2010]
    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.
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  7. akash_sky1
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    akash_sky1 Active Member

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    [Apr 23, 2010]
    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.
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  8. A4_DTM
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    A4_DTM Member

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    [Apr 23, 2010]
    Just checked with jonnyc, TTRS and RS6 injectors don't fit :(
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  9. PH1L
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    PH1L Gievf Buckets VCDS Map User

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    [Apr 23, 2010]
    dans s3 (the vagoc one talked about) is running rs4 injectors with over 500bhp
    #8
  10. Unitronic
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    Unitronic Fear is just a word!

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    [May 8, 2013]
    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:
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  11. S3Alex
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    S3Alex Rarely neutral

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    [May 8, 2013]
    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.
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