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Thread: fuel pump

  1. #1
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    fuel pump

    Hi
    I have a guestion about a fuel pump. Did some one know what is a maximum working pressure of standard pump? And what is a maximum BHP on standard pump?
    Thanks

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  3. #2
    <tuffty/>'s Avatar
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    Depends on which car... S3 has a higher rated pump (4bar) than the A3... in theory should support most hybrid turbos power up to around 350hp but only if the pump is in tip top condition... there have been a few failures recently as pumps are old and wearing out..

    If going for hybrid, factor in a new fuel pump... if going BT then factor in an inline pump too

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

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    Haa ok thanks mate.
    I going to remap my car on the end of this month and i wasynt sure about pump but now I will hange it because i going for 350 .
    But have you got a some idea about fuel injectors? I fit a bosh 365 cc are you thing they will suport 350BHP?

  5. #4
    <tuffty/>'s Avatar
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    Quote Originally Posted by ttaalliibb View Post
    Haa ok thanks mate.
    I going to remap my car on the end of this month and i wasynt sure about pump but now I will hange it because i going for 350 .
    But have you got a some idea about fuel injectors? I fit a bosh 365 cc are you thing they will suport 350BHP?
    Whats the spec of the mods? what car? normally fit Bosch 550cc injectors for hybrids etc when heading over 300hp... all on a 3bar fpr... no need for a 4bar one

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

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    I have a few mode . Big turbo custom exhaust manifold lighened fly wheel with carbon cevlar clutch. S3gearebox, light pulleys 365cc injectors and i will fit a 5bar fuel pump .
    And the car is a a3 1.8t ajq engine fully refurbished engine.

  7. #6
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    what turbo? 5 bar seems excessive why not get bigger injectors?
    What lightened pulleys have you gone for?...

  8. #7
    <tuffty/>'s Avatar
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    AJQ enjine is an A3 quattro isn't it?... if you know the intank pump is ok you could fit an external inline pump to support it like a DA-31... that will be more than enough

    As Dave said... what turbo?

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

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    <tuffty/>'s Avatar
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    ...oh yeah... just spotted the lightened pulleys... urrgghh...

    Is this power pulley kit worth getting anyone ???

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

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    I like them pulleys. They are more than1.5 lighte than oryginal. And for 60 £ is worth to buy it.
    I have a t3/t4 turbo with 27 psi boost.

    If I will have to then I will buy bigger injectors but not necceserly becouse I paid 50£ for them 365 cc injectors nad i dont want to spend too much money .
    And I need new pump because my pump has cover a 200000 miles.

  11. #10
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    £60 is nothing compared to a rebuild/ new engine...please read the posts on tufftys link..

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    Ok thanks for that ... i will ask seler that them pulleys are balanced just to confirm but then I will take them off.
    And back to the injectors . If i use a 4 bar with them injectors should run to 350 ? Of them injectors are not enought?

  13. #12
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    It's not about the pulleys being balanced, its about the pulley absorbing the high frequency engine vibrations.

    I also made the mistake up buying those pulleys, they make nice ornaments now

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    Ok then I will take them off on weekend

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    But what you thing if I get fuel pump with 5bar pressure them injectors will run a 350?

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    Just to clarify for you folks it have a AJQ engine, 180bhp as standard and it's in a a3 Quattro,

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    Have the rods been done?
    Injectors would only go up to 405ish? @4 bar so not enough at all, 550ccs are well on there way @350bhp

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    No the rods not yet. That why I dont want to go more than 350. I need to consider what will be easier. New pump anf filter and all the pipes or just buy and re fit bigger injectors.
    Then if i fit 550 injectors then i will be able to run them on standaerld pump?

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    No the rods not yet. That why I dont want to go more than 350. I need to consider what will be easier. New pump anf filter and all the pipes or just buy and re fit bigger injectors.
    Then if i fit 550 injectors then i will be able to run them on standaerld pump?

  20. #19
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    And there is a wsy how tu check injectors pover?

  21. #20
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    550s and a new pump would be best mate, be careful @350 on standard rods...

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    That is a safe power. Crank is forget then...
    And there is a few them audis with 350 bhp in poland and they have no problems. And i am a careful driver and I will not overuse that power

  23. #22
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    Crank is fine for a lot more than 350bhp its the rods that will be unsafe, anyway your car mate... just warning you

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    Ok .
    I will change them later on because now I sepnd all my sawings. But what about pistons? If i fit forged rods do I need also a forged pistons?

  25. #24
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    Pistons are fine @ 350..

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    Aha I will see how is going on dyno and then I will see it meybe i will go for less. But how you thing what power will be safe for my?

  28. #27
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    Its the Torque that kills the rods, nobody can tell you a safe level mate, its a lottery, obviously the linear the map the better

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    Thanks mate

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    Aha
    Thanks for all mate

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