38 replies to this topic

[SiKnEsS]

from peoples personal experience/research what is the maximum safe amount of boost can be handled by a rb25, also wat sort of power increase can be expected, cheers

[mr-squiggle]

mate of mine is running 12... he has turbo-back exhaust, and a pod filter... but on the first night of running it we needed to put differnt plugs in, because it wasnt able to fire properaly

[sinister]

The stock turbos won't take a whole lot of boost, that is your weakest link. $1500 or so for a decent turbo, then your injectors will want to start crying for help so there is another good $800 or so, you will also then need a new ECU and tune so add another $1500+ as well as another fuel pump to keep up with the fuel delivery so another $250. By this time you've probably got all the supporting mods to have enough power that the internals won't want to last too long on high boost, but you will have a substantial power figure compared to standard.

You can't really say what boost the motor will take as the stock turbo is the limit not the motor. The amount of boost on other turbos depends on the tune, how well the motor has been looked after and even the size of the turbo. A smaller turbo has to work harder to create say 20psi which means hotter intake temps, a larger turbo will do 20psi with better intake temps which means less chance of detonation which means longer engine life.

[gtp_vlbt1]

14 psi on pump fuel

stock injectors, stock timing, turbo will run out of puff above this boost level, also dont be a fool run a FMIC asap if you want to keep it safe

with the spark plugs get a decent set of platinums gap down to 0.8mm,

[SiKnEsS]

thanks, ive got a hybrid fmic kit on order already, and also some other goodies, expecting bout 350-400 rwhp wen its all done

[sinister]

You got a kit on order for a car you don't own? :?

[SiKnEsS]

ive already put a deposit on the car, just waiting for time to fly down and get it

[UDLOOZ]

What do you do for work dude??^^^ You seem to spend alot of coin on cars..or you are gonna spend alot of coin????

[SiKnEsS]

im a diesel fitter/ light vehicle mechanic/ and a qualified window tinter, but working as a 4x4 mechanic atm, i own a house, a unit, and two cars and i do spend alot because i can, and much more to come :weedman:

[sinister]

And you can't forget about a Skyline and buy a 315hp 180?

[NJA82]

You better have a fair few "other goodies" in there my freind if you are expecting 350-400rwHP. Thats quite a bit of power and i would say would be on the edge of the stock internals.

[SiKnEsS]

who said i was gona run stock internals? and matt im not buying your car cause everyone knows it round here, ive copped enuf shit from havin my lux and it gets me 2 fired up

[SiKnEsS]

i just wanted 2 know wat stock internals would handle while all is done and im driving a stoka

[UDLOOZ]

ive seen heaps of skylines on e-bay for sale.... some are packing some good mods too...so so cheap.. like 14k for this awesome r33..

[sinister]

Yea but that is coz it's a hilux!

[SiKnEsS]

a fast hilux but, and because i had street cred before i owed it, i want to build sumthing from stock, without anyone knowing wats in it

[SLAPPA]

ha ha ha ha

[NJA82]

Well said ^^ if 350-400rwHP is your goal man, maybe look at a HKS GTRS , they have very good response on the RB25 and make very high numbers.

[gtp_vlbt1]

GT35/40r will make the power you need

for your combo you'll need

at least and not limited to

550 cc injectors (unless you wanna run big numbers get 740cc)
FMIC
ZORST
decent aftermarket management (autronic so you ditch the afm and ray hall can tune it for ya )

or apexi powerfc

decent fmic, something thats not cheap rubbish
GT35/40r, decent turbo manifold if you wanna spend the extra dollars

while your changing the turbo ditch all the crap oem oil and water lines and use

Teflon, stainless braided hose, -8 hose is good for this, (you dont have to worry about blocked water or oil lines in this case)
available from enzed just take the old ones in and get them made to fit +100mm on them so you can flex them a bit

many ppl have at least 300rwkw on a stock bottom end (these are up to the task as long as its tuned propery), when it goes bang just get a RB30 from a wrecker ditch the head and keep the block, bolt up the Rb25det head and your now laughing


depending how much you wanna spend, you can make a cheap RB2530 with ACL pistons rings and acl gasket kit if done yourself for about 3k all up

[SiKnEsS]

SLAPPA said:

ha ha ha ha

wat r u laughing for slappa? ure the one u got axed by a stock 4 banger lancer lol, or do i have 2 refresh ure memory lol :butthead: