How Much Boost?

[NissanFreak]

Guys,

My engine will be finished shortly and i was wondering the boost i will be able to run on pump fuel, Optimax Extreme

RB30 Bottom End

RB26 Top End

9.0:1 CR

T04Z 1.00

Ported

HKS Cams etc

THanks guys

[MattSR]

18 pounds or so with good tuning

[NissanFreak]

ok, do you think this will make 400kw at all four at this boost?

[MattSR]

18 psi is only just getting the TO4Z into its efficiency zone... I couldnt say for sure if you'll crack the 400awkw mark at that boost

[Morgs]

Might be a question(s) for your engine builder/tuner, what'd they have to say?

[NissanFreak]

havent asked the tuner as yet, the engine builder says 20psi max on pump but cant give me a power figure

[fEkuaR]

ull soon find out.

[BU5TER]

who's tuning it and who built it

[pnblight]

is it the garret t04z if so the garret ball bearing turbos are rate to 2 bar max but if you want much reliability i would say 20psi(if everything is as it should be).

[NissanFreak]

Well il let you guys know how i go, im hoping to make 400-450 awkw on pump and then see how much it makes on race fuel.

Just hope the OS Giken gearbox holds up

[BU5TER]

Post up some pics?

[R31Nismoid]

Guys,

My engine will be finished shortly and i was wondering the boost i will be able to run on pump fuel, Optimax Extreme

RB30 Bottom End

RB26 Top End

9.0:1 CR

T04Z 1.00

Ported

HKS Cams etc

THanks guys

how long is a piece of string really.

until you get in onto a dyno, and get the tuner doing (hopefully) what he knows best.

Then there is no real way of telling to be honest.

Every car is different in its parts etc etc so its really an impossible question to answer with little more than a guess

[T04GTR]

yes. it really depends on whos tuning it and how much timing they put in it. if evrythings up to spec(fuel system etc) 20-25pound should be fine. you can run more but it will ware out just like any engine

[rob82]

If you go decent size cams and de chamfer the head you should be fine for 20psi.

[RACESPEC]

24psi

CHeers

Tarek

RACESPEC

[NXTIME]

It will depend on the dyno settings

Highest I have seen was 680rwhp by TUFGTR at Summernats using a T88. TO4Z is a better turbo.

[WetGTR]

20 psi will get you there as I have done this on my GTR with a RB26 (400kw). Others have also acheived this, same turbo, boost, cams. A note on this is that head work is required to lower flow resrictions You can get this running 260 cams or more if you run larger cams. Running 25psi will get you 450-470 mark as R32-GTS got 468kw with 25psi running 272 cams.

This of course will all depend on your tuner, but the engine is capable. Even more so with a RB30 bottom end - very nice

[NissanFreak]

Thanks guys, the tuner I am using was recommended by SydneyKid, the cams are HKS 272 IN/EX.

[WetGTR]

272 cams, some nice lift say 10.2 or more, big exhaust system and fuel setup, I'd say 470-480awkw running 26psi and push the T04Z all the way!!! Check on R32-GTS results which was on Ultimate 98. Running Extreme is good for another 10-20kw on top so I don't see a problem. This is very similer to a setup I want

BTW running 9.0:1 CR is so very nice, don't forget about good quech.

cheers

Adam

[NissanFreak]

If the car makes 450awkw i will be cheering, i will be over the moon if it makes it on pump fuel and im told its safe. Just hope the OS Gearset holds up LOL