Jump to content
SAU Community

How Much Power Rb25det Kkr430 Link Ecu + Fpr

tarmac

By tarmac,
in Engines & Forced Induction

 Share

Recommended Posts

tarmac Enthusiast

tarmac

Posted
  • Author
Posted (edited)
no it didnt

sorry, was 208, just checked dyno sheet.

50 psi base pressure, + 15psi boost = 65psi .. should give it abit more fuel..?

in saying that, i should be able to work out where im at with the below. theres also an article done by autospeed regarding flow rates vs pressure, basically showing that pressure increases = quite small increases in flow.. so what are stock injectors good roughly? i need to find a maximum safe setting for base pressure. http://autospeed.co.nz/cms/title_Boosting-...86/article.html

stole this from another forum:

The flow is supposed to increase according to the following formula.

F2=F1 x SQRT (P2/P1)

So, assume you have 270cc/min injectors at 36 psi pressure difference, then, if you increase fuel pressure to 42 psi, the resulting flow will be:

F2=270 x SQRT (42/36) = 292cc/min

This formula will work with pressure difference, have in mind that there is always some pressure present at the intake manifold, and it needs to be substracted from the fuel rail pressure in order to obtain the pressure difference.

Like Mcquirk said, doubling fuel pressure will lead to 1.4 times the flow, for 270cc injectors, that is some 380cc/min. BUT, the problem now will be the fuel pump, which likely won't give you the necessary flow at such a high pressure, so, it's much better to install larger injectors and work them near their test pressure.

Edited by tarmac
Adriano Grand Master

Adriano

Posted
Posted

Dont wind it up too high, the walbros loose heaps of flow when the pressure is wound up, they only flow 500hp worth of fuel at about 40 psi, give it 70 psi, and they flow about 350hp. TBH kkr turbos dont have a great rap in regards to power vs boost needed vs lag

tarmac Enthusiast

tarmac

Posted
  • Author
Posted
Dont wind it up too high, the walbros loose heaps of flow when the pressure is wound up, they only flow 500hp worth of fuel at about 40 psi, give it 70 psi, and they flow about 350hp. TBH kkr turbos dont have a great rap in regards to power vs boost needed vs lag

yeah i realise theyre shit turbos but i got it cheap. ill get the internal as tight as possible and with electronic boost control can only do me best to avoid lag / boost threshold, otherwise no worries just to drive around it.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

KKR430, around i think 230rwkw is about the most anyone has made.

on the hub dyno it'll be higher, probably 240-250 (same as your 208 with factory turbo)

Plenty of results in the RB25 dyno sticky thread.

tarmac Enthusiast

tarmac

Posted
  • Author
Posted (edited)
Sounds like a happy dyno that turbo will not make that power at 14psi

ive done the same turbo on another dynapack that time by st hitec in auckland with a engine thatd done 230k's, did 242rwkw, power fc, larger injectors. this tune was done by glenn suckling who has the 1600hp gtr running 7's.. even if it is abit 'happy' it gives an indication of what they can do. they are cars in the 260kw range with these turbos. an 2 degrees timing was the difference between 233rwkw and 256rwkw. a/f's are hovering around 12 .

moral of story;

kkr430 / dsr430 turbos while not the best with their shitty internal wastegates that you need to load alot of preload on and the fact the interal barely opens, are decent turbos on 25's and you can get away with standard injectors with a fuel reg.

Edited by tarmac

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Manur33
      Rb25det coil loom wire identification

      By Manur33 · Posted

      Hi, i’m making a rb25det coil loom for Vag short coil. Can anybody tell me which Ecu signal wire belong to coil number 1 and 2,3,4,5,6? The connecting switch in above pic is 8 wire i think white is for +12v and black for earth.
    • davemoto63
      Stagea choice's which model??

      By davemoto63 · Posted

      Was there ever a model of the Stagea m35 that didnt have a badge on the grill? I thought I saw that somewhere, some aero edition or something? I cant find it again? davemoto
    • davemoto63
      Noobie Stagea owner..

      By davemoto63 · Posted

      Its a 2002 vr-x four VQ25DET, silver. Coil overs, lowered, polished alloys and sport exhaust. Bit of a project, was sitting in a shed for a while but runs and drives great.
    • CF.Panda
      R34 25GT Engine Light 21

      By CF.Panda · Posted

      I wasn’t able to replicate the sound anymore. It was a one time sound so maybe it was just coincidence but it was like small pebbles being dropped in a coke can.   should I try cleaning the MAF? It could be it’s functioning but dirty? I don’t know.
    • sunsetR33
      Unpeeling the Orange

      By sunsetR33 · Posted

      Update 4: Hi all. The car drives again! Haven't driven for long, only to store it in the garage again, but the test drive was successful. The coolant and oil leaks seem to be fixed for now. Temps on the engine were also very good, while moving I never even saw 80C water during the approx. 30 minute drive. Ate up all the coolant in the reservoir though so will have to fill that even more when I go to the car next time. One thing that pisses me off is that the RPM gauge is still f**ked, I even resoldered the board twice and used copper paste on the silly screws that are used as connections. Next time I take it out I'll take apart the board and fit new components, I'll see if I can get a replacement IC for it.  I have an appointment set for 22nd of September for the engine tune to 370hp. Alignment also still needs to be done. My hope is that I can get all the legal stuff over with by the end of this season. Anyone of you have advice regarding intercoolers? Currently there is an APEXI core fitted, one of those weird hybrid ones, 600x270x76. I don't think it's bad but it's not new and now I still have the chance to change it now to legally include it in the paperwork. Only issue is that the only options that would arrive in time are a HKS Type R intercooler or generic Ebay spec intercoolers comparable to a JustJap one. Ideally I'd order a Plazmaman but it takes over a month to receive which would mean making the car legal has to wait until next season. Would love to hear some input on this. Same story for my injectors, the previous owner was a nunce and put ID 1050x on the engine. They work but are obviously not ideal at "normal" power levels. But I don't see a reason to change them unless the tuner says it's necessary. I read online before buying a different exhaust that the top secret style rear diffusers won't fit due to the size of the rear resonators. My buddy and I made it work by slightly "adjusting the shape" of the mounting bracket and making some spacers out of 3d print for the mounting bolts. Fits like a charm. Just putting this here in case someone has this problem. Even the hefty HKS Silent Hi Power rear can fits without hitting anything.
×
×
  • Create New...