Whats The Best Pistons And Rods To Use For Rb 25/30 Conversion

[lcxu105]

Hi all just wanted to know what rods and pistons everyone is using and what power level they are making to decide what to use for my own set up. Will be using a 25 neo head that has been ported and currently makes 381 hp on a rb25 neo engine with 14psi of boost from the std factory turbo and factory inlet. When i build the new engine it will run a custom hi-mount exhaust manifold and Greedy inlet manifold on 18psi boost.

Thanks Dave

[NYTSKY]

If you are making 380hp it is not with the standard turbo especially at 14psi.

[KiwiRS4T]

Read the RB30 PDF - there is a good discussion on rods and pistons. I suspect the most popular numerically is stock.

[lcxu105]

Turbo is hi flowed by hyper gear and has been fitted with steel wheel to run hi boost. Car is going in next week if rain buggers off to get re-tuned.

[lcxu105]

Well i'm still waiting to get some feed back on what pistons and rods to run. want to build an engine that will make 500@ wheels.

[Adriano]

500hp? You can do it with stock internals, pretty much any aftermarket pistons and rods will be up to the task(Just remember you need different pistons for a neo 25/30 to a normal 25/30) I used ACl VL flat top rb30 forged pistons for the last neo30 build, cant remember what the CR ended up, but around 8.8:1 from memory.

Edited March 28, 2014 by Adriano

[lcxu105]

did some serching on the net and from what i have found, CP pistons and just about any h beam rod with good rod bolts and some quality berring will do the job just fine. So what would be an ideal C/R 8-5-1, 9-1 ???

[KiwiRS4T]

Stock rods with better bolts will be fine for will be fine for 500hp but if you are planning on 800hp down the track may as well go fully forged and balanced. You want the higher CR but be careful... the CP 9:1 pistons will give you a much higher CR with the Neo head so you may want to get the nominal 8.5:1 pistons for your car.

[lcxu105]

Here is the old dyno sheet with 265KW or 355hp@rw 14 psi in top end bleeding back from 18 psi