The-31 Rb30Det, Restrictions? Power? Weak Points? This Build

[RB30TI]

Hey,

So I've Finally got around to building a RB30DET for THE-31 which is my Aus Spec R31 TI Which was bought new back I'n the day by my grand parents and handed down.

So what i acutely want to know with MY set up (not someone else's) is what power figures i would be looking at? What are my Restrictions? And what are my weak points?

Here is what i have.

Block:

- RB30E

- Bored 40Thou Over

- ACL Forged Pistons

- ACL Rods

- ACL Big & Small Bearings

- ACL Gasket/Seal Kit

- N1 Oil Pump

- STD Crank

- STD Water Pump

- Underdriven Harmonic Balancer

- STD Sump

Head:

- RB25DET

- Ported & Polished

- STD Valves

- Stronger Springs

- STD Lifters

- Tomei Poncams 256 In/Ex

- Works Adj Cam Gears

- Greddy Copy Plenum

- Q45 Throttle Body

- Stainless Hi Mount

- HKS Waste Gate

- GT35/40 With AR.70/ M24 Front Housing

- Split Fire Coil Packs

- MLS 4 Layer Head Gasket

- VRS Gaskets/Seals

Fuel:

- Bosch 044

- 2L Surg Tank

- Denso 880CC Inj

Also Have:

- RB25DET Gear Box

- Apexi Powrer FC

- 3in Exhaust

- 3in Stainless Dump Pipe

- 600x300 Front Mount

- B&M Oil Cooler Kit

- STD Clutch Fan (Do Have EL Thermos But Took Them Out)

What Do You's think?

Thank you for any positive feed back.

[zebra]

By the looks of that youre pretty much sorted.

On thing I can pick is using the ctandard con-rods which will limit you to around 7000rpm and be safe

and the N1 oil pump measn you wont be able to do rev limiter skids

Apart from that and it isnt a biggie is that stainless high mount manifolds like to crack, and the cheap ones tent to have boost control issues.

[R32Abuser]

As Zebra said, I think your limiting factor will be your pistons/rods (depending on how much boost and the fuel you want to run). IIRC the ACL "forged" pistons are not actually forged - I could very well be wrong, but I remember reading something along the lines of this in the RB30 thread...

Also to note - be wary of the condition of your valve-train (lifters mainly!). I may be having issues with my setup caused by ageing valvetrain or insufficient spring stiffness/seating pressure. At an absolute minimum get your head reco'd whilst its off and out of the car.

Edited October 10, 2011 by R32Abuser

[Gerg_R31]

Cp or Je pistons would be better then the acl stuff

[RB30TI]

Thanks For the input fella's.

Ive had the car running with the bottom end set up how it is for awhile now just With a RB30et running probably 200Rwkw. 

The piston are 8.5cr, the rods are ACL but not H-Beam or anything, i was fairly sure the pistons were forged??

The heads got new valves and stronger springs and was recod but the same can't be said for the lifters

Any idea of power figures?

[Harey]

I suppose the question is how hard do you want to run it? Turbo is capable of between 330-500rwkw

[bubba]

Two things I will mention, I just got some Reimax gears for my N1 pump, for AU$430 delivered it would be something to think about doing.

Get a decent sump just for safetys sake, I run an ASR 6.5L baffled/gated item.

Power? Probably looking at ~350rwkw?

[RB30TI]

I would be happy With 330-350 atw

[zebra]

the ACL pistons are made by ROSS, there is nothing wrong with them

[Gerg_R31]

Agree there is nothing wrong with the Ross, acl/mahle pistons, they will do the job, personally from what I've seen cp & je are equally the better quality piston

[Harey]

I would be happy With 330-350 atw

You could make that with a GTX3076 with a lot better response. Depends what you want out of the car.

[RB30TI]

I Would like a SAFE 330-350rwkw but more is always welcome just want to know what's the most I could get out of this set up safely.

[RB30TI]

And the car is only a streeter and on the strip from time to time but no track work intended

[felixy69]

Pretty much u gt it all

I would suggest upgrade gears....stock 5spd rb25 gears might be easy to break depends on how u drive !

But looking at ur self up .... I don't think u would go easy on it lol !

[GTRsean]

Maybe also a crank collar would be a good idea......

[zebra]

how did we miss that!? lol

[RB30TI]

I did buy a crank collar but never installed it, what is involved?

Stupid question but what does the crank collar actuly do? :S

[Gerg_R31]

Machining the snout of the crank and original oil pump drive, press fitting on, drilling and tapping 2 grub screws,

Gives more surface area to connect with on the oil pump

and yeah how did we miss that

[TiTAN]

another thing that may be an issue, the 3" exhaust is going to start to be a restriction if you push that turbo

[KiwiRS4T]

Do you have the VCT connected and running? Is that a Garrett 35/40 or a copy ( I thought Garrett woulkd be .63 rather than 70 exhaust).

Should make 350kw ok maybe more with a really good tune. 3.5 or 4in exhaust would be good.

What about a pic of your mint one owner car?!!