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Thread: Fuel pump failed - decided to upgrade...but which injectors?

  1. #21
    Guest loves2spooge's Avatar
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    Quote Originally Posted by CrazySx View Post
    Have a look here
    https://h-dev.co.uk/product-category...v=79cba1185463
    You will find the required supoorting mods for each stage and the expected power output

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    Sweet! It sees like all I need now is a boost controller and that board and I'll get a significant power increase. Thanks man.

  2. #22
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    Unless you go for H-Dev map it's pretty pointless to get 550cc injectors. You might aswell go for 740cc so you don't need to change them again if you want more power...

  3. #23
    Guest CrazySx's Avatar
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    Quote Originally Posted by bahis View Post
    Unless you go for H-Dev map it's pretty pointless to get 550cc injectors. You might aswell go for 740cc so you don't need to change them again if you want more power...
    That's a fair comment. But wouldnt they be too big for a smaller power setup? What do 555's max out at?

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  4. #24
    Guest CrazySx's Avatar
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    Quick Google reveals..

    https://www.driftworks.com/forum/thr...r20det.210645/

    I think 555's are plenty unless you are looking for mega power

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  5. #25
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    Those look more like crank figures tbh.

    I don’t understand the injector discussion because the fuel pump has failed. Chuck a walbro in. You can run up to 13/14 psi on the standard map and with the right supporting mods including removing the cats (or at least using a sports cat and a free flowing down pipe) it’ll transform how the car feels.

    Don’t bother with injectors until you’re swapping the turbo out imo. Both the standard injectors and turbo max out within 20-30bhp of each other.
    1998 Nissan 200sx s14a , 2000 std 5 speed with nismo supercoppermix clutch bn6 Sapphire Blue

  6. #26
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    Quote Originally Posted by CrazySx View Post
    This is not true. Nismo 555 injectors, front mounted intercooler, 3 inch exhaust (ideally turbo back), colder plugs, walbro pump on a standard turbo can give you upto 300. Maybe a little more on a BB turbo. Obviously you need to up the boost (either manual controller, actuator spring or electronic). This is about all you need for a HDEV stage 2a map. I know as i have one and 300bhp. Oh and a good clutch might help, thought i was forgetting something! Lol
    It is true though, Hdev 2a runs the 555's to give extra headroom and run at a lower duty cycle than standard, but standard injectors can and do supply enough fuel to max out a t28 or t28r, I know this 'because I did it' I ran standard injectors (that were flowed and clean) for 4 years at approaching 100% duty cycle at times, maxing out the standard t28, and when I stripped my engine down to forge it, there was zero sign of det or any lean running on the pistons, head, or cylinder walls. 555's are a pointless upgrade in all honesty if you're just running a standard turbo, and a hell of a lot of people will agree with this, which is why 740's are almost always recommended over standard as they'll support the 'common' next turbo step such as a 2871r.

    Congratulations on having a Hdev map though, I've also got one, sitting in my garage in a box if that somehow adds more relevance to my post?

    Quote Originally Posted by Chriscooke View Post
    Those look more like crank figures tbh.
    I'd be surprised if 550's even made that power at the crank unless the Dyno is super generous!
    Last edited by Slamz; 16-12-2018 at 15:33.

  7. #27
    Guest CrazySx's Avatar
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    Quote Originally Posted by Slamz View Post
    It is true though, Hdev 2a runs the 555's to give extra headroom and run at a lower duty cycle than standard, but standard injectors can and do supply enough fuel to max out a t28 or t28r, I know this 'because I did it'. 555's are a pointless upgrade in all honesty if you're just running a standard turbo, and a hell of a lot of people will agree with this, which is why 740's are almost always recommended over standard as they'll support the 'common' next turbo step such as a 2871r.

    Congratulations on having a Hdev map though, I've also got one, sitting in my garage in a box if that somehow adds more relevance to my post?



    I'd be surprised if 550's even made that power at the crank unless the Dyno is super generous!
    Fair enough mate. I was lead to believe the injectors maxxed out at higher boost, i.e. 18psi?

    How much power did you make on standard injectors?

    What ECU are you running?

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  8. #28
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    Quote Originally Posted by CrazySx View Post
    Fair enough mate. I was lead to believe the injectors maxxed out at higher boost, i.e. 18psi?

    How much power did you make on standard injectors?

    What ECU are you running?

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    The standard t28/t28r is out of it's efficiency range at 18psi, standard injectors can flow enough fuel for this though as long as they're not full of crud or falling apart.

    The car never went on a dyno with this setup, but was regularly checked on the road, it was up near 300bhp I expect. It was on a Hdev 1a chip at this time with a few tweeks

    555's give you the extra headroom I admit, so should be 'safer' than standard injectors. But it's all down to the map and the person setting it up!

  9. #29
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    Quote Originally Posted by Slamz View Post
    The standard t28/t28r is out of it's efficiency range at 18psi, standard injectors can flow enough fuel for this though as long as they're not full of crud or falling apart.

    The car never went on a dyno with this setup, but was regularly checked on the road, it was up near 300bhp I expect. It was on a Hdev 1a chip at this time with a few tweeks

    555's give you the extra headroom I admit, so should be 'safer' than standard injectors. But it's all down to the map and the person setting it up!
    Fair play. I guess it very much depends what the OP is aiming for in the long term.

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  10. #30
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    Quote Originally Posted by CrazySx View Post
    Fair play. I guess it very much depends what the OP is aiming for in the long term.
    Exactly that. If he's wanting the 'next step' above 300bhp, he'll probably go down the proven route of a 2871 or similar, in which case 740's are the best option. Looking back, mine was the most fun compared to cost and hassle at 1a on standard stuff, so I'd recommend the op just keeps it simple!

    Sorry for derailing the thread so much!

  11. #31
    Guest CrazySx's Avatar
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    Quote Originally Posted by Slamz View Post
    Exactly that. If he's wanting the 'next step' above 300bhp, he'll probably go down the proven route of a 2871 or similar, in which case 740's are the best option.

    Sorry for derailing the thread so much!
    Can you not use 555's with a 2871r?

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  12. #32
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    Quote Originally Posted by CrazySx View Post
    Can you not use 555's with a 2871r?

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    Some people have with a .68 rear housing, but generally you'll run out of fuel before air, so most tuners will advise 740's. As 740's are about the same sort of price too, it makes sense to buy them

  13. #33
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    Quote Originally Posted by Slamz View Post
    Some people have with a .68 rear housing, but generally you'll run out of fuel before air, so most tuners will advise 740's. As 740's are about the same sort of price too, it makes sense to buy them
    Cool, thanks for that. I have 555s at the moment. If i decide to go more power with a bigger turbo i will keep it in mind. At what power do the 555s max out?

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  14. #34
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    The only reasons to run 555cc injectors with a 2871r are if you get some cheap or you plan on running a chip.

    740’s will allow you to max out the 2871
    1998 Nissan 200sx s14a , 2000 std 5 speed with nismo supercoppermix clutch bn6 Sapphire Blue

  15. #35
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    Quote Originally Posted by CrazySx View Post
    Cool, thanks for that. I have 555s at the moment. If i decide to go more power with a bigger turbo i will keep it in mind. At what power do the 555s max out?

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    I'm sure someone else can give a more accurate figure but around mid 300's is ballpark

  16. #36
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    740s always unless your just planning modest grunt, 550s are ok but run out of puff to soon and with a decent blower that come quickly.
    If you dont want say more than 340 then 550s are ok but going up to the 400 mark and you will want 740s

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