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  1. #1
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    Want to up the power, need some advise please.

    The stage im at is i have an apexi air filter,full 3 inch exhaust all the way through,skykine decat pipe, i have splitfire coilpacks and ngk uprated plugs,the boost is standard at the mo and i have just brought, or in the process of buying a walbro fuel pump and am waiting on the arrival of a greddy dump valve(cheers dean), after that i intend on geting a gizzmo boost controller but what kind of power will i get and what kind of boost can i run?i have all the guages to monitor what the car is doing also

    Need to no the basics really as sxoc seem to think these mods on a s14 would take it too 250bhp,hmm not sure really as thats quite a bit more power on a 14 but then again i here you saying 300bhp is easily achievable for a s15

    Paul

  2. #2
    craig8585 is offline I'm so cool, I have my own fan thread :p
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    There are loads of threads like this in this section mate, just look through the pages as you will get the info you need quicker and easier. Heres a quick guide I wrote a while ago, but it is only a guide and was S14 based but I've adapted it!

    You should get 300bhp on the standard tubby. Some say you can get 320 but there are just so many variable factors. Biggest one of which would be the different Dyno's that people use IMO



    This is just a general guide for what mods are required for boost upgrades. People have different opinions about this, but If you stick to this guide you should be ok.
    This does not take into consideration essential things like suspension, brakes and clutch improvements that will be required at an early stage.

    Standard - 0.7bar boost, 250PS
    Curb weight 1200–1270 kg

    Stage1 - 260-280bhp
    Free flow air filter
    Free flow exhaust
    Uprated fuel pump
    Boost controller to achieve 0.9 bar boost pressure
    Cooler spark plugs
    Super unleaded fuel
    Custom ECU remap

    Stage 1a - 270-290bhp
    Free flow air filter
    Free flow exhaust
    Uprated fuel pump
    Boost controller to achieve 1.0-1.1 boost pressure
    Front mount intercooler
    Cooler spark plugs
    Super unleaded fuel
    Custom ECU remap

    Stage 2 - 280-300bhp
    Free flow air filter
    Free flow exhaust
    Uprated fuel pump
    Boost controller to acheive 1.1-1.2 bar boost pressure
    Front mount intercooler
    Cooler spark plugs
    Super unleaded fuel
    Custom ECU remap

    Stage 2a - 290-310bhp
    Free flow air filter
    Free flow exhaust
    Uprated fuel pump
    Boost controller to acheive 1.2-1.3 bar boost pressure
    Front mount intercooler
    Tubular manifold and uprated turbo elbow
    Uprated dump valve
    Cooler spark plugs
    Super unleaded fuel
    Custom ECU remap

    Stage 3 - 310-330bhp
    Free flow air filter
    Free flow exhaust
    Uprated fuel pump
    Boost controller to acheive 1.2-1.4 bar boost pressure
    Front mount intercooler
    Tubular manifold and uprated turbo elbow
    Nismo 555cc/740cc injectors
    Z32 AFM
    GT28RS or GT2871r turbo
    Uprated dump valve
    Cooler spark plugs
    Super unleaded fuel
    Custom ECU remap

    Stage 3a - 340-360bhp
    Free flow air filter
    Free flow exhaust
    Uprated fuel pump
    Boost controller to acheive 1.3-1.4 bar boost pressure
    Front mount intercooler
    Tubular manifold and uprated turbo elbow
    Nismo 555cc/740cc injectors
    Z32 AFM
    GT2871R turbo
    Uprated dump valve
    Cooler spark plugs
    Super unleaded fuel
    Custom ECU remap


    Stages beyond this will require internal head and bottom end work too..

  3. #3
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    thats really helpfull dude, thanks for that

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    craig8585 is offline I'm so cool, I have my own fan thread :p
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    NP mate. You should be ok on standard injectors and AFM too for 300ish as S15 injectors are bigger than S14 ones. When you get it mapped they will keep an eye on this for you

  5. #5
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    i sent the bov thursday mate, but as its easter might not be with you till tuesday - sorry, if id got to the posties on wednesday half hour earlier it would be with you by now

    if i were you i'd get in on a intercooler group buy over on sxoc, then fit the boost controller, fuel pump, and take it to be mapped and have the timing set up. should make a little over 300 @1.2bar before maxxing the afm and injectors out. turbos not much good for any more than that either........clutch will be on its limit too but the t28 at 1.2bar really kicks you in the back - great fun, but will run out of puff at about 5500rpm

  6. #6
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    I'd be putting a front mount on before you start adding more boost and power

  7. #7
    craig8585 is offline I'm so cool, I have my own fan thread :p
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    Quote Originally Posted by Auss15 View Post
    I'd be putting a front mount on before you start adding more boost and power
    Yeah good point, I adjusted the figures slightly!!

    Has your car been mapped by H Dev already Curryzz? I seem to remember mook talking about having it mapped to 0.9 bar on the WMIC?? Could be mistaken though.

  8. #8
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    Quote Originally Posted by craig8585 View Post
    Yeah good point, I adjusted the figures slightly!!

    Has your car been mapped by H Dev already Curryzz? I seem to remember mook talking about having it mapped to 0.9 bar on the WMIC?? Could be mistaken though.

    Now that you mention it craig my car seems to be at about 0.9psi is that not standard then, i notice it mostly on the motorway when i put my foot down it boosts too 9.0 psi, should it boost to 7.0 in 6th if its standard then?hmm got me thinking now, mook didnt say anythink about it too me tho, i thought mine was maybe boosting a tiny bit higher because of the decat?

    oh and i recieved my bov this morning dean, thanks buddy its very nice,just need my car back to fit it on now lol

  9. #9
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    fitting an open filter and turbo back exhaust will, naturally, raise the boost pressure to around the 0.9 bar mark mate - very common. trick is to not allow it to change too much without having the mapping altered to suit otherwise det may occur

  10. #10
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    9.0 psi is about 0.6 bar and is standard boost...

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