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Forged pistons on 25 rebuild

PHaT MR30

By PHaT MR30,
in Engines & Forced Induction

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PHaT MR30 Grand Master

PHaT MR30

Posted
Posted

what boost level is the limit that you should go before requiring forgies?

does this also taking into account how many revs the engine is going to do.

trying to draw up a budget for my engine rebuild and want to make it bullet proof but on a budget.

the particular form of induction i am hoping to use is good for 20 psi max, 1,000 cfm of flow and up to 680hp.

its gonna be $$$ everywhere i look, i then need to look at injectors what to get there, bigger fuel pump and on and on.

it will be fun though, and i wanna go on the dyno next year at MAS!

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tbeffect Enthusiast

tbeffect

Posted
Posted
slap a set of arias pistons with your GTR rods.

If you want, when im done i'll send you a estimate costing of everything based on what ive just had done to mine.

yours sounds similar

R31Nismoid, I'd be interested in that aswell if possible. I'm another one on the same path :P

japsky33 Enthusiast

japsky33

Posted
Posted

Hi Phat Mr30,

Theres no set limit where you will require forged pistons as a good tune will keep a motor intact until the power is to great for the rods.

If your looking at making over 300Kw at the wheels then you will also need to be changing the rods to forged items.

As for the headgaskets I have run myn at 22 psi for over a year and had no problems completley standard motor once again its the tune that plays a huge part..

The RB26 rods are stronger then 25's and The arias pistons are great for your application and cheap

Br,

JH

what boost level is the limit that you should go before requiring forgies?

does this also taking into account how many revs the engine is going to do.

trying to draw up a budget for my engine rebuild and want to make it bullet proof but on a budget.

the particular form of induction i am hoping to use is good for 20 psi max, 1,000 cfm of flow and up to 680hp.

its gonna be $$$ everywhere i look, i then need to look at injectors what to get there, bigger fuel pump and on and on.

it will be fun though, and i wanna go on the dyno next year at MAS!

nv033 Community Regular

nv033

Posted
Posted
If your looking at making over 300Kw at the wheels then you will also need to be changing the rods to forged items.

any particular reason for this?... i know it is a good idea...but do u know of the limits of a standard rb25 rod?.... do u know of someone possibly that spat one?...im interested in y u say this as it is ~$1500 extra especially if ur not going to be needing it? :(

japsky33 Enthusiast

japsky33

Posted
Posted

HI Nv033,

There’s no real way of saying what’s the limit of a standard RB25 because it depends on the driving conditions. Obviously excessive RPM all the time and high power outputs is going to cause an issue. I’m making just over 320rwkw and I’m not really keen to lean on the motor anymore with the standard rods that’s a personnel thing I don’t want to be buying a new block and rebuilding my motor just yet. If your willing to stretch it to the point of blowing and then purchasing the new rods and block that’s your decision. I know Martin Donnan has had a lot of experience with RB25's and he says anything over 300rwkw is pushing it as Steve-sst just said though he has not seen any problems at this power level except a rod bolt and I agree with going the ARP bolts. But I think everybody would agree that much over 320rwkw the 25's days are limited in standard form.

Personally I would decide what power output your looking for and what you want to use the car for occasional drag or drifting ? If its over the 320rwkw that you want then change to RB26 rods. Let me tell you the difference between 290- 320rwkw is not really noticeable on the road because you will still be sliding all over it. :D

So it’s your decision

BR,

JH

any particular reason for this?... i know it is a good idea...but do u know of the limits of a standard rb25 rod?.... do u know of someone possibly that spat one?...im interested in y u say this as it is ~$1500 extra especially if ur not going to be needing it?  :D
japsky33 Enthusiast

japsky33

Posted
Posted

WOW! :rofl: Thats sweet 9000 ? And it was still pulling all the way ?

thats very impressive..

:wassup:

JH

my factory RB25det rods looked in perfect condition when we pulled the motor down ... it was making 330rwkw and had a redline of 9000rpm which I used quite frequently, I've heard only good things about the venolia pistons
Lepperfish Mentor

Lepperfish

Posted
Posted

I got venolia pistons in my RB25 and have had no problems..

I got a rebuild kit from hi octane racing for just under 4k with venolia forged pistons, forged conrods, new nissan engine gasket kit, tomei head gasket..

I then added tomei adjustable exhaust cam, ARP rod bolts and head stud bolts..

BBQ Community Regular

BBQ

Posted
Posted
Can someone tell me the part number for the ARP rod bolts to use ??

 

If there is a difference between GTS-t rod - bolts and GTR rod - bolt, please advise.

 

Thanks in advance.

SR20 ARP bots are the same for RB series motors, They will work with GTS-T rods and GTR Rods. The only problem is they come in a pack of 4 so you have 2 bolts left over.

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