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Rb25/30det

cruzin33

By cruzin33,
in South Australia

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cruzin33 Veteran

cruzin33

Posted
Posted

Im still in the air with the rb25/30 combo iv hade a look at the rb30 topic but with 300pages its a c**t to find what i need.

Will regency look at the numbers on the block?

What mods will i need to do to the engine mounts as the rb25/30 with stock plenum sits higher?

Can i still use a strut brace?

Will the rb25det cam cover fit, if not what will need to be done?

What is the best clutch to use for the torque of the rb25/30 with around 270kws?

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cruzin33 Veteran

cruzin33

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Well i wana build the motor strong so in the future i can go for a lot more hp i have a limit around the 10grand mark and thats for the internals and to be built by a pro so it must be able to be handle around 500hp-600hp witch i know is alot but thats why im only going for a strong build not power first up. Im still not sure to push the 25 to the limits and build the rb25/30 myself on the side as a slow project as i have the bottom end and soon bout to get my hands on the rb25de top.

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KISIN Veteran

KISIN

Posted
Posted
Well i wana build the motor strong so in the future i can go for a lot more hp i have a limit around the 10grand mark and thats for the internals and to be built by a pro so it must be able to be handle around 500hp-600hp witch i know is alot but thats why im only going for a strong build not power first up. Im still not sure to push the 25 to the limits and build the rb25/30 myself on the side as a slow project as i have the bottom end and soon bout to get my hands on the rb25de top.

Just go the 26 head, you know you want to :D

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Bl4cK32 Grand Master

Bl4cK32

Posted
Posted
Well i wana build the motor strong so in the future i can go for a lot more hp i have a limit around the 10grand mark and thats for the internals and to be built by a pro so it must be able to be handle around 500hp-600hp witch i know is alot but thats why im only going for a strong build not power first up. Im still not sure to push the 25 to the limits and build the rb25/30 myself on the side as a slow project as i have the bottom end and soon bout to get my hands on the rb25de top.

sky30's was around 300rwkw and it had a std bottom end.

Spend 5k on the motor, and the rest on accesories to get the power down. Clutch, gearbox, diff, shockers, bushes all turn to shit after a while with a fair whack of torque behind them. Tyres shred so be prepared for uber sticky / uber expensive rubber

10k on a motor means jack when u blow a box, then clutch, then...

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Cubes Grand Master

Cubes

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Posted

500-600hp on the std bottom end is a walk in the park for the RB30.

Good tune and rev limit of 7000rpm and they are fine.

If you want more rev's then you grab the spool rods and CP pistons combo for 2k and your set.

Machine it up, balance, king bearings a few bottom end tweaks and your looking at around 3k.

So 5k for the bottom end is all you realistically need.

The head could no doubt do with a valve grind and new valve stem seals. That's not overly expensive.

If you are really serious have the buckets machined to allow for greater than 9mm lift cams and drop a set of suitable valve springs in to it.

By the time you have some one remove/install, build the bottom end, sort the head, put it all back together, good clutch and tune you will be looking at 10k easily.

Then consider a decent diff, 1.3k installed + turbo 1.8k + other required turbo bits $600 + injectors $800 + fuel pump $300 + exhaust manifold if you want over ~490hp at the fly - $1000, Thats up to another $5800.

Then you loose your license. :D

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