tarmac Posted June 18, 2010 Share Posted June 18, 2010 (edited) running a kkr430 / dsr430 t3 t4 .63 exh ar link ecu intercooler exhaust 500hp external pump walbro sard fuel reg rb25det im hoping for 260ish with wound up fuel pressure.? what you think Edited June 18, 2010 by tarmac Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/ Share on other sites More sharing options...
Guilt-Toy Posted June 18, 2010 Share Posted June 18, 2010 210rwkw Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300412 Share on other sites More sharing options...
tarmac Posted June 18, 2010 Author Share Posted June 18, 2010 (edited) 210rwkw doubt that. last rb25det made 218rwkw on a dyna pack stock pressure with inline 500hp pump. stock turbo. Edited June 18, 2010 by tarmac Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300432 Share on other sites More sharing options...
tarmac Posted June 18, 2010 Author Share Posted June 18, 2010 (edited) whats a general limit on maximum base fuel pressure with 15psi boost on top Edited June 18, 2010 by tarmac Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300435 Share on other sites More sharing options...
JonnoHR31 Posted June 18, 2010 Share Posted June 18, 2010 rb25det made 218rwkw. stock turbo. no it didnt Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300441 Share on other sites More sharing options...
tarmac Posted June 18, 2010 Author Share Posted June 18, 2010 (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 June 18, 2010 by tarmac Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300453 Share on other sites More sharing options...
Adriano Posted June 18, 2010 Share Posted June 18, 2010 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 Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300463 Share on other sites More sharing options...
tarmac Posted June 18, 2010 Author Share Posted June 18, 2010 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. Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300473 Share on other sites More sharing options...
tarmac Posted June 18, 2010 Author Share Posted June 18, 2010 think ive answered my own question now, but for anyone who is interested in the future, heres a another good read.http://evocoupe.net/forum/viewtopic.php?f=2&t=3884 Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300505 Share on other sites More sharing options...
R31Nismoid Posted June 18, 2010 Share Posted June 18, 2010 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. Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5300585 Share on other sites More sharing options...
tarmac Posted June 21, 2010 Author Share Posted June 21, 2010 dyno'd today,dynapack hub dyno. full boost by 3500rpm. 256rwkw @ 13.8psi 98 octane. kkr430/dsr430 internal wastegate fuel pressure reg upped pressure on standard injectors intercooler external walbro pump Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5304434 Share on other sites More sharing options...
boostn0199 Posted June 21, 2010 Share Posted June 21, 2010 Sounds like a happy dyno that turbo will not make that power at 14psi Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5304520 Share on other sites More sharing options...
tarmac Posted June 21, 2010 Author Share Posted June 21, 2010 (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 June 21, 2010 by tarmac Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5304538 Share on other sites More sharing options...
R31Nismoid Posted June 21, 2010 Share Posted June 21, 2010 Sounds like a happy dyno that turbo will not make that power at 14psi read my earlier post - it was pretty much spot on Link to comment https://www.sau.com.au/forums/topic/325431-how-much-power-rb25det-kkr430-link-ecu-fpr/#findComment-5304558 Share on other sites More sharing options...
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