Ideas; For rebuilding RB25 GTST

[RTA 13B]

This my boss's car.

Budget $4000.

There will be no labour costs we will be doing the rebuild ourselves.

Engine's max boost(dual stage) will be 20psi.

What I want to find out is...

1)Recommended pistons and rings.

2) " crank big and main bearings.

3) " metal head gaskets.

4) " after market coil packs.

In saying recommended, I want to know from those that have tried different brands and how those brands stood up.

We are in Sydney and mainly interested in import parts or local as long as we can get them local by end of August at the latest.

Again much appreciated.

[Morgs]

Why does it need to be rebuilt - as in what went wrong the first time?

This will impact many things in the build

20psi with what turbo? Boost is only a figure and it needs to be dealt with as a relative measure

About the only thing you've listed that is independant of that rule are the coil packs - standard Nissan is usually fine - but splitfire coils are available ~$600 last time I heard off nengun.com

Alot of RB25s are running the arias piston/ring kit which can be had ~$1250.

TOMEI is a popular head gasket - from what I've heard ~$500 but best to get a better price on it from nengun or similar.

[RTA 13B]

The turbo is based on the factory exhaust housing only. The impeller will be a twin bladed turbine same will be done to the compressor turbine. The compressor turbine will also be 5mm bigger in diameter.

The engine is getting a rebuild at 88,000km. Clock was probably wound back. Engine bearings are failing. Engine near impossible to crank by hand. Struggles to run. The oil level had been neglected to the bottom line on the dipstick. How ever after having spoken to Shops in Sydney, they have informed us that the factory sump has no baffle system. When the level is very low, and the car is accelerated hard the oil flows to the back of the sump and away from the pick up.

Also my boss wants to start from scratch with this engine.

What about injectors?

For a high flowed factory turbo, how much cc rate for injectors?

Aftermarket computers? Apexi?Microtech?Haltech? What would you choose to use on this system?

As for the budget the computer price can go on top of the $4k.

[Trust33]

Dude look at nengun or similar and write down prices and the like.

Example:

*Apexi/pfc:$XXX.XX

*Nismo 555cc injectors(or whatever u need):$XXX.XX

RaRaRa!!!

You will soon work out the cost involved.And base the build arround your hp target.There is realy no need for overkill when the costs are pushing the build budjet.It will depend on what you want to achive for the car.

Second hand/Reco parts might be the go if he wants the extra not so needed parts that come with a rebuild to cut the costs.

If you look arround on the forums you will find allot of people are asking the same questions.

[paulr33]

get rid of the dual stage crap. run one boost level and tune for that. if your going to pull the engine apart and fix stuff why not do the rb30 bottom end. you'll be doing half the work anyway and for an extra $2000 odd youll have a twin cam 3 litre instead, will make much more power everywherne, come on boost quicker and make more torque all over, something bolting a hiflow on wont do

hiflow turbo $2000

apexi powefc $1400 tuned

cold air intake $250

fuel pump $200

injectors 550c (or nissan s15 480cc) injectors = $800 odd

heavy duty clutch $1000

electronic boost controller (or actuator spring change) = $250

pineapple kit to stop diff hopping or "axle tramp" = $150

[RTA 13B]

I'll post this up for those who are interested.

After stripping down the engine found the following;

1) Pistons 1, 2, 3, 4 all had their middle bridge between the compression rings broken on the turbo side. = sweet stuff all compression.

2) First main end cap bearing on the verge of failing.

3) Turbo tubines/shaft very difficult to turn by hand, like someone had it lubricated with silicone.

The last two problems come down to lack of maintenance by my boss's brother. Not regularly checking oil levels.

The oil level(when the problems started) was on the bottom line

:lol:

All is fixed now and the turbo high flowed, car goes like a bullet.