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  1. #1
    S3 Paul's Avatar
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    Vaux VXR injectors or 550?

    Pending some more logging i may well be needing some larger injectors...
    The options seem to be towards either Astra VXR ones or Bosch 550cc ones...
    The car will be sticking with the same set up otherwise for atleast the next 8 months so im limited to 300ish bhp im running standard S3 injectors at 4bar at the moment . would fitting the vxr items and leaving the set up at 4 bar be good or bad? The reason i ask is ... at my level of tune its a very slipery slope if i start...
    The VXR ones come up at 115 ish per set new from vauxhal and the best ive managed to find bosch ones at is £55 each plus the adaptor for the loom.
    so its £115 v £250+
    if the first option is a good one i can just about scrape enough together for the map tweak and a B5 tip.

    So... good or bad idea????
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

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  3. #2
    <tuffty/>'s Avatar
    Badger 5 Edition

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    Do it right first time and get Bosch 550's.... loads of data on these to get them setup right in maps and better spray pattern than vxr...

    Welly fitted vxr injectors and they didn't flow enough depsite the alledged rating of them..

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  4. #3
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    You could order here they come in cheaper and only took 6 days for mine to arrive
    Bosch 52LB / 550cc Hi Impedance Injector

    2000 Audi S3 Black. Engine rebuilt Wossner internals, custom map, B5 3" TIP, Haldex blue, sport shifter, H&R ARBs, Green filter, 8P gear knob, 18" RSTTs, K-sport 8 piston 330mm brakes Ferodo pads front & rear, Nitrac disc rear, AP coilovers, adjustable tie arms, Powerflex bushes all round, yellow mount, LCR splitter, 3" DP & decat, 006p & Liquid CUBE, Forge FMIC, 550 injectors, CR Hybrid Turbo Stage 4 and Custom manifold


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  5. #4
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    I got Te adapters from here cheaper than IE also quick delivery P&P was cheap to

    Home Shop Connectors / Harnesses Injector connectors EV1 to EV6 2 way Single-piece Injector connector adapter

    All in with the exchange rate was around £150 for injectors and adapters

    2000 Audi S3 Black. Engine rebuilt Wossner internals, custom map, B5 3" TIP, Haldex blue, sport shifter, H&R ARBs, Green filter, 8P gear knob, 18" RSTTs, K-sport 8 piston 330mm brakes Ferodo pads front & rear, Nitrac disc rear, AP coilovers, adjustable tie arms, Powerflex bushes all round, yellow mount, LCR splitter, 3" DP & decat, 006p & Liquid CUBE, Forge FMIC, 550 injectors, CR Hybrid Turbo Stage 4 and Custom manifold


    Audi S3 (310 bhp & 311 lbft)
    Aston Martin V8 Vantage
    CBR 600RR (08 )

  6. #5
    Prawn's Avatar
    My other car is a MINI!!!!

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    good info there Hammy

    Paul, as Tufty said, Welly had the VXR injectors and they maxed out almost straight away. Slightly more flow than stock, but nowhere near enough
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  7. #6
    knoxie's Avatar
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    at what stage should people be thinking of going bigger?
    Silver S3 02 AMK
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  8. #7
    beachbuggy's Avatar
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    +1 for balingermotorsport . Bought a few sets from them, great service.

  9. #8
    Prawn's Avatar
    My other car is a MINI!!!!

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    Quote Originally Posted by knoxie View Post
    at what stage should people be thinking of going bigger?
    When you need them
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    Prawns TFSI Turbo'd 1.8T Track Car

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  10. #9
    boost-addict's Avatar
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    Quote Originally Posted by Prawn View Post
    When you need them
    stop being a arse, so if you have a k04 would you need them, basicly weres the threshold for stock fuling at 3 bar or 4 bar.

    so these vxr items arent good enough for 300bhp? or as above? 550 sounds to much for 300bhp????

  11. #10
    s3dave's Avatar
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    Ive got the genesis 550s, i think they are similar if not better to map?

    Boost-addict... westys standard s3s are maxing out at 285? @3 bar

  12. #11
    Prawn's Avatar
    My other car is a MINI!!!!

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    Quote Originally Posted by boost-addict View Post
    stop being a arse, so if you have a k04 would you need them, basicly weres the threshold for stock fuling at 3 bar or 4 bar.

    so these vxr items arent good enough for 300bhp? or as above? 550 sounds to much for 300bhp????
    I'm not being an arse, the topic has been covered 6 million times before, and the chap has been a member for a year now. He also gave absolutely ZERO information in his post about what turbo, or current injectors he has, so how could anyone give an informed opinion?

    I could answer the question perfectly well for just about every state of tune for an A3 or S3 with all manner of turbo's, but if the question was asked without any huge effort, why bother putting effort into a reply.....
    -------------------------------------------------------------------------------------------------

    Prawns TFSI Turbo'd 1.8T Track Car

    But I know nothing so ignore me.

  13. #12
    Westy's Avatar
    Double Dark Side! Diesel & 8P

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    I did some data logging after my engine rebuild and found that my standard injectors were running at 130% at 3 bar I'm now running a 4 bar FPR (thanks Prawny) and the injectors are a lot more comfortable but still around 95%.

    I have some Bosch 550s and adapters on their way now from IE, currently sat at UK customs according to the tracking number.

    As I've stressed on many ocaissions before. I've got a nice collection of various engine parts that have cracked due to running a map with too lean fuelling. It's so important to get it right.
    8P A3 TDI - 220bhp - 335lbft
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  14. #13
    RIP S3dave

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    Quote Originally Posted by boost-addict View Post
    stop being a arse, so if you have a k04 would you need them, basicly weres the threshold for stock fuling at 3 bar or 4 bar.

    so these vxr items arent good enough for 300bhp? or as above? 550 sounds to much for 300bhp????
    Wellys on 550's on his hybrid ran 90% IDC on 3bar for its 338bhp
    440's will do it at a push, but as already said, VXR ones despite what you read seemed barely any more than 386cc std when we ran them.. ie not enough for his hybrid. (@ 3bar)
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  15. #14
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    Question.
    Are APX/BAM engine coded injectors(385CC) bigger than APY/AMK engine coded injectors?
    What about the TT QS (240 BHP)?
    2000 Brilliant Black TT Quattro.
    2010 Daytona Grey TTRS.

  16. #15
    RIP S3dave

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    I dont think so no

    386cc is what I have known them as, although its size in map for consumption on a BAM is listed as 372cc
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  17. #16
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    Quote Originally Posted by badger5 View Post
    I dont think so no

    386cc is what I have known them as, although its size in map for consumption on a BAM is listed as 372cc
    I'm asking this because some time ago i saw a member here cleaning his injectors and i noticed his didn't have the metal snout that protrudes into the intake tract like mine do, hence the question for different size.
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  18. #17
    RIP S3dave

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    yea there are different style injectors, but not sure if they're same cc....
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  19. #18
    s3dave's Avatar
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    Quote Originally Posted by Rosso TT View Post
    I'm asking this because some time ago i saw a member here cleaning his injectors and i noticed his didn't have the metal snout that protrudes into the intake tract like mine do, hence the question for different size.
    ahh you mean the long nose blue ones fitted to early TTs/APYs yes they are the same cc

 

 

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