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Injectors 800cc?

Discussion in 'A3/S3 Forum (8L Chassis)' started by S3Zek, Jul 22, 2012.

  1. S3Zek
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    S3Zek Member

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    I'm trying to find out what injectors i need and the best place & price to get them, What size and make do you guys run for 400-500hp? Would I be right in thinking 800cc? Many Thanks :)
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  2. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    870's for me at 440bhp so far but still have loads more to go, i would like to see near 600

    what spec of engine will it be

    welly is on 630's
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  3. S3Zek
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    S3Zek Member

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    Rods pistons, arp stud and nut arp mains, large port head, superteck valve gear, large front mount, in line fuel pump, top mount mani with poss a gt3071r or there abouts so 400+ is what I would like if it is poss from that
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  4. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    arp's main and head studs are a bit over kill but you might want to get some uprated valve springs

    Welly is running standard gear on a 440 bhp with 630 cc also, his is a good example of what the standard stuff can cope with
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  5. BuuBBa
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    BuuBBa Member

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    870's with 100% duty cycle can take You around 540hp..
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  6. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    That's at 3 bar they will do that

    I do have a 4 bar fpr and a adjustable one that goes upto 5 bar so I still have more
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  7. BuuBBa
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    BuuBBa Member

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    Yep.. With 4bar those flow about 920cc. What pumps You are running?
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  8. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    hmmmm
    mine was max'd out a little less than that in practice on 870cc @ 3bar
    bsfc calc a little skewed
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  9. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    standard in tank pump and performance inline one also
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  10. jamieA3
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    jamieA3 Member

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    Rods pistons, arp stud and nut arp mains, large port head, superteck valve gear, large front mount, in line fuel pump, top mount mani with poss a gt3071r

    how do you enter that on confused.com quotes lol
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  11. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    stock S3 pump flows 3.3ltr/min no load
    bare this in mind if not using a swirl pot as a buffer capacity
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  12. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    gt3071 620cc is adequate..
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  13. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    Do you recommend a swirl pot for my set up?
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  14. BuuBBa
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    BuuBBa Member

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    At which power in practice? Just curious..
    I used bsfc .63 and meant crank hp.
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  15. BuuBBa
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    BuuBBa Member

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    Please specify this "performance inline pump".
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  16. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    DA-31 Tuffty is also using one in his
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  17. S3Zek
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    S3Zek Member

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    should I go a little bigger just to be on the safe side?
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  18. S3Zek
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    S3Zek Member

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    Lol will soon find out in a few months ;) must admit I'm not looking forward to the responses lol,
    How much bhp in ur a3 sir!!!!!.......is it for the road?!!!!! Lol
    Last edited: Jul 23, 2012
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  19. superkarl
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    superkarl MAN OF STEEL

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    adequate probably means 10-15% headroom, which i think is what you should run at for egt protection and incase of any problems.
    so im sure bill has taken that into account in sayng 620 is adequate. i suppose it depends whether you might get bored and want more. but even bigger injectors can upset driveability, or so i've read.
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  20. S3Zek
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    Ok, cool thanks for that.
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  21. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    you're on stock fuel rail I guess?
    I would be checking fuel pressure @ rail when doing the max power runs on your 550+bhp aims
    thats a lot of fuel demand through a 6mm ID fuel line
    #21

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