RB26DETT head or RB-25DET engine???

[Sil8ty]

Just helping a mate out here with an engine or head swap on the RB-30ET...Not sure which way he wants to go, and money i dont think will be an issue.. He has burnt a valve out i think and is now wanting to upgrade..

He is undecided to either go a complete RB-25DET engine/g-box swap in the car, or doing the RB-26DETT head on the RB-30 Turbo engine...

If using the RB-25DET we will use the Hi-Flow Turbo of the engine now..

Any advise out there??? Please...

[Sydneykid]

There is no substitute for capacity.

[hungry6]

Should ask him how much hp would he be comfortable with? and then see.

a good completed rb25 is slots straigh in is gonna be lots cheaper, than a bolt on rb26 head onto a rb30 bottom and then u still got the unknown factor of the old rb30 bottom end holding together with the new re-power.

[Sil8ty]

Yeah i hear you all!!! What sort have power have people seen with the std RB-30 engine with the RB26 head??

Just trying to compare this to the RB-25det swap? Which i am in more favour of... As the

RB-25DET are a stronger engine standard right???

Sorry for all the q's just trying to figure out the best way to go, before i commit to this guy... : )

[Sydneykid]

Yeah i hear you all!!! What sort have power have people seen with the std RB-30 engine with the RB26 head??

Never done a standard internals RB30 with an RB26 head, sort of like feeding strawberries to cops. Have done a standard internals RB30 with an RB25DE head, it made 475 bhp on the engine dyno. It's still going strong after 4 years. The average power absolutely kills an RB25 or RB26 with the same maximum power. That's what an RB30DET is all about, higher AVERAGE power for less money. :aroused:

[Sil8ty]

Thanks for that.. I think we will be doing the complete RB-26 engine swap, with RB25 sump and 5speed box.. Can get all this for around the $6,500.oo mark, also with loom, computer A/F meters etc.. This i think would be the way to go.. As we eventually want around the 300kW mark at the wheels.. In a VL this should be a pretty good combo...

With this in mind, you think there is an easier way of doing this, as i have heard the std RB-30 bottom ends aren't strong enough for this power in std form.

Appreciate all your feed back guys...

[Sydneykid]

With this in mind, you think there is an easier way of doing this, as i have heard the std RB-30 bottom ends aren't strong enough for this power in std form.

We have several standard internal RB30's that disprove that, the 475 bhp example for a start. It would make a little over 300 rwkw on the chassis dyno, it has never been on one as it was tuned on the engine dyno. We are certainly not alone, check out RIPS standard internals RB30 in their drag car.

[Scooby]

Never done a standard internals RB30 with an RB26 head, sort of like feeding  strawberries to cops.  Have done a standard internals RB30 with an RB25DE head, it made 475 bhp on the engine dyno.  It's still going strong after 4 years.  The  average power absolutely kills an RB25 or RB26 with the same maximum power.  That's what an RB30DET is all about, higher AVERAGE power for less money. :aroused:

I don't see Sydneykid's point. I'm a pig and I quite like strawberries.

Seriously what's a ballpark $ figure to cost effectively build an RB 26 or 25/30 like the one mentioned above and install it into an R32 GTR - if that's feasible? Are there any major compromises or big issues in doing this eg engine height or gearbox compatibility? Does it retain the twin turbo setup?

I know there's a sticky on the site but it's very, very diverse.

Seems like a great conversion and I can't understand why more people don't do it, although it may become apparent in the answer to the above.

[Sydneykid]

I don't see Sydneykid's point. I'm a pig and I quite like strawberries.  

Seriously what's a ballpark $ figure to cost effectively build an RB 26 or 25/30 like the one mentioned above and install it into an R32 GTR - if that's feasible?  Are there any major compromises or big issues in doing this eg engine height or  gearbox compatibility?  Does it retain the twin turbo setup?

I know there's a sticky on the site but it's very, very diverse.  

Seems like a great conversion and I can't understand why more people don't do it, although it may become apparent in the answer to the above.

It doesn't matter whether you like strawberries on not, the fact is, if you were a pig, they would be wasted on you. :nowigetit

For a rebuilt standard internals RB30 for ~475 bhp you are looking at $1,200 to $1,500. There are plenty of posts (not just from me) giving detailed costings, do a search. RIPS in NZ make and sell a 4wd sump adaptor for retail consumption, they can be found on Skylines Downunder. Gearbox bolts up, as does the clutch. No problem with height using an RB26 head, the RB30 block is not as much taller as the cross over pipe is on an RB20/25. You can have as many turbos as you like.

It is a good conversion, not for everyone though. There are plenty around, we have built 11 X RB31's in the last 18 months. The RB30 thread is a good indication of the interest.

Hope that helps

[Scooby]

It doesn't matter whether you like strawberries on not, the fact is, if you were a pig, they would be wasted on you.   :nowigetit  

Hope that helps  

Yes I am familiar with the saying, just my dry sense of humour that prompted the comment I made. Thanks for the info.