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Rb25Det Engine Rebuild

Billionaire_Project
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Billionaire_Project Explorer

Billionaire_Project

Posted
Posted

Hey guys, a mate and I are starting a rebuild on his 33. Last engine threw a rod via big end fail, 3 holes in the block and a severely damaged block drifting at QR. M

Want some thoughts on this package, main goals are 300+ kW, it will be a drift/ street car but more drift, he does like to rev it quite hard.

Specs now:

3076 turbs

Wold 3d V500

540 injectors

Front mount

Stainless manifold

Full 3 in exhaust

Split fire coils

Fuel pressure reg, surge tank

Rebuild part list so far ( please give comments and thoughts, nothing is bought yet)

All ports matched to gaskets

N1 pump

New water pump

ARP main and head studs

Cometic gaskets

Cp pistons

Eagle or Manley rods

Tomei Poncams 256

Adj ex gear

Baffled, and larger sump

Oil cooler

All ports will be gasket matched, oil return line and ports enlarged/ cleaned up. Crank balanced, all pistons & rod will be balanced. Block needs to be bored and honed, still unsure about wether it needs to be decked. Any othe suggestions?

Cheers

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https://www.sau.com.au/forums/topic/438239-rb25det-engine-rebuild/
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Ben C34 Grand Master

Ben C34

Posted
Posted

Why wouldn't you deck it? It would be at a machinist anyway, and hardly costs anythings to do.

The port matching to gasket is pretty much pointless, typically the gaskets are a reasonable amount larger than the ports, so you would just be doing this

___/\____ (gasket goes between slashes, makes more sense in my head than on the screen)

Hacking shit up and making it worse with a die grinder is easy, improving the flow characteristics of a port is really hard.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

If you are fitting an N1 pump and like to sit on the limiter read at least the last third of this thread:

http://www.skylinesaustralia.com/forums/topic/110680-oil-control-in-rbs-for-circuit-drag-or-drift/?&hl=sk+oil+control

boostn0199 Grand Master

boostn0199

Posted
Posted

Stay with stock pump or if you want just upgrade the gears in them, Im personally still using stock engine stock oil pump with 350kw last 3 years in my drift car and no problems so they can take the abuse.

Billionaire_Project Explorer

Billionaire_Project

Posted
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Posted

Will only deck the block if it needs it, can't see a reason to just deck it. More with the gasket porting is Exh, oil, water. The rb25 heads flow more then enough for what we require. However one of the engine builders recommend it so that's why I was asking here.

Stock pump was trashed and picked up a new n1 for almost free, still looking at changing gears in them. Definitely fitting a crank collar.

If you are fitting an N1 pump and like to sit on the limiter read at least the last third of this thread:

http://www.skylinesaustralia.com/forums/topic/110680-oil-control-in-rbs-for-circuit-drag-or-drift/?&hl=sk+oil+control

Yeah have spent the last couple of days reading that and plan to do sump vent, restrictors and possibly look at .cam cover baffles

Stay with stock pump or if you want just upgrade the gears in them, Im personally still using stock engine stock oil pump with 350kw last 3 years in my drift car and no problems so they can take the abuse.

Yeah we were thinking of just staying stock, everyone says they are fine at that power but then this is also just ticking the boxes for later, we aren't really doing much headwork yet. That might come later, most probably will.

internal or external gated?

are you planning to stay with 540cc injectors? seems small

Still tossing up going e85 so that will mean complete fuel system change. Also fairly happy to keep 540's in for the run in phase and if it becomes a problem upgrade then. Injectors aren't to bad to change after the fact, it's more bottom end we are focused on ATM.

Internally gated ATM, not sure weather it's worth changing to externally gated, have to do more research.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Still tossing up going e85 so that will mean complete fuel system change. Also fairly happy to keep 540's in for the run in phase and if it becomes a problem upgrade then. Injectors aren't to bad to change after the fact, it's more bottom end we are focused on ATM.

I'm getting 314AWKW at less than 90% duty on 98 petrol from my 550 Deatschwerks so you should be fine for now.

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