Jump to content
SAU Community

Recommended Posts

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

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

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.

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.

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


  • Similar Content

  • Latest Posts

    • That is surely the biggest gathering of Stageas in North America, ever!
    • Remember kids - if you can't afford to buy 2 GTRs......
    • I know people cry at the price of the Getrag 12-14k for a conversion now, but it really is a nice mid point. Not going to get change from 10k on a gearset installed.  $30k++ for sequential.   I know you run the risk of a damaged used one and parts are hard to get but as a street car gearbox its really hard to beat. If you enjoy a more traditional manual, its the choice no question.     
    • Time to decide what’s more import, your power level or your budget because you’re going to struggle to keep both 
    • Our Southern Highlands Cruise is proudly registered with “R U OK?” Day.  Sometimes the best way to check in on your mates is by getting out for a drive together. Sharing a common passion like cars creates the perfect space to chat, connect, and support each other.  A simple “R U OK?” can make all the difference. Let's enjoy the drive, the company, and look out for one another. PLEASE WEAR YELLOW FOR “R U OK?” DAY Sunday 14th September 2025 9:30AM Meeting Crossroads Homemaker Centre 10:00AM Cruise Departure Via Old Hume Hwy 11:45AM Arrival at Mittagong RSL Club Meet Location: Crossroads Homemaker Centre Final Destination: Mittagong RSL Club *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
×
×
  • Create New...