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Rb25 Setup Help For Over 500hp

GreeceS13

By GreeceS13,
in Engines & Forced Induction

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GreeceS13 Rising Star

GreeceS13

Posted
Posted (edited)

Hi guys,

I bought a rb25det engine with box for my S13!!

I am looking for over 500hp for drag strip and everyday car!

I will for the begining that I don't have much money to spend and I also want a safe motor!

Where is the limit of the stock pistons? How much horses can handle with good rich mapping (high 11 afrs?) ?

And where is the limit of the stock rods? How many rpm can handle and how can I avoid any damage of them with my driving?

Can I strengh the rod's limits with changing the bolts with arp? I read somewhere this but please confirm this to me :blush:

I will work with stock cams and head!

The parts I will order are:

Greddy style intake

Q45 throttle body

XS Power top mount manifold (I will increase it strengh with a "help bar" and some extra welds)

JUN Crank Collar

N1 oil pump

Tomei oil gallery ofrice (and I will block one oil feed and I will increase the flow of the oil return)

52mm koyo style cooler

I have fmic from my previous motor with core 600x300x76mm and if you think that it isn't enough I can put a same with 100mm core!

I am from Greece and the climate here is quite hot.

My exhaust is 3"! Enough?

I have walbro fuel pump and as I read I need a fuel pressure regulator because stock of rb can't control the big fuel pressure of the walbro!

555cc injectors and 300zx maf and remapping the stock ecu.

And I will try to buy a twin plate clutch kit instead to buy a single ACT even then I read that act can handle 500hp!

If I will buy a twin plate maybe I will buy

Also I bought a gasket kit to replace everything! Also head gasket I will leave the stock.. what limits it have? I read something for 1.2bar boost!

I don't know yet what turbo to use....!

Garret choices:

GT3076 I think that with this I couldn't go more than 520hp..

GT3582 Garret says 400-600hp according the housing...!

Greedy TD06 25!! At 1.15bar with absolutely stock motor got 500bhp!!

Anyone knows how much more can go with more boost?

Turbonetics GT-K 550!! I love the look of this turbo! :banana: 500-600hp rated!

Also any help with the garret turbos what horsepower you can think that can give with the same boost to compare and with what compressor housing? (1.1-1.2 bar)

Garret's are also cheaper choice!

Also please tell me your comments for my choices, tell me what else I will need and help as much as you can :banana:

Edited by GreeceS13
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https://www.sau.com.au/forums/topic/197729-rb25-setup-help-for-over-500hp/
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subzeroR33 Mentor

subzeroR33

Posted
Posted (edited)

I dont think 500hp will last long on stock internals, i hope thats a metal head gasket.

At least get forged rods and pistons, and balance the motor.

I would go with a GT35R or a GT3582. With a .82 housing, ur 3 inch will be fine.

You should get the power with standard cams, but i would definately get some minor head work done.

Edited by subzeroR33
tridentt150v Grand Master

tridentt150v

Posted
Posted

500hp at the crank is approx. 270-320rwkw, depending on drive train and friction etc, its way too variable to put a hard and fast figure on the conversion from chp to whp.

But a std motor will handle up to 300rwkw, but when you get to that level its a roll of the dice as to how long your motor will last.

But I don't care what you say, DA is correct, it'll cost you heaps..............its reality, you can't avoid it.

GreeceS13 Rising Star

GreeceS13

Posted
  • Author
Posted (edited)

Ok maybe it will cost and more... but I don't ask you tell me how much will cost!

I ask many questions... can anyone reply me please?

Please I need replies in all of my question... they are very important for me..!

Also I need ecu as my tunner said me that it cannot remapping the stock..!

Emanage choice is good? Can I have launch control for drag strip? Can it increase rev limiter (because a friend told me that it cannot)? Also I don't need 300zx maf right? Can I run with only the map sensor or it needs the stock maf?

Edited by GreeceS13
J3TR33 Community Regular

J3TR33

Posted
Posted

just buy a GTR with the amount of money u have to spend to get the power u need.

"I will for the begining that I don't have much money to spend and I also want a safe motor!"

If you dont have enuff money to spend why u telling people no to tell you about prices. They are being realistic and have obviously gone down this path before. If you dont have 10-15k to spend on the car then why bother even thinking of doing it.

To me it all sounds like a lil kid with a big dream, and then he wakes up with his pants wet.

SirRacer Experienced

SirRacer

Posted
Posted (edited)

Im not very good with crank horsepower as it doesnt mean shit to me, but personally i wouldnt bother opening up the engine so your going to save a bit of costs there. If it does go bang rebuild it with forged bits. Personally i dont think you will have any issues with it.

They run 9.1 comp ratio which is nice and high, so in my opinion run a gt3076 (.82) with upgraded injectors, pump etc and a good computer without an afm

A friend here is running 270kws at 14psi on a stock as a rock rb25 so its very doable.

Start off with running that turbo on the standard exhaust housing and i think that should get near your power goals without being that expensive.

Edited by SirRacer

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