Forged rb26 project please help

[Dan BNR]

Hi guys just wanting a little info

i have a bnr34 with a forged engine i built years ago bottom end finished havnt touched the head yet. Wanting to push around 680whp on 100octane and close to 800whp on e85 in New Zealand.

mods so far 

billet gears in oil pump

cp forged pistons

manley forged h beam rods

custom sump 9L

oil returns drilled will also run a head drain

oil restrictor

plazmaman 100mm intercooler on the way

looking into a pt6466 gen 2 not sure what a/r to run looking on the t51rmod website as i want to do the t51r mod also thoughts on this turbo? Most likely divided also

or is a 6466 over kill drop to a 6266?

i will be getting head ported may even have cnc porting. Unsure on cams duration and lift etc? 
 

looking at maybe a sinco top mount manifold unsure on gate size also? 
 

have thought about fueling yet
 

this will be a street car with a few track events

[r32-25t]

For 800whp you’ll need at least a 6466 and even that may not be enough and a step up to the 6870 might be required

[Dan BNR]

Seen a few people pushing some good numbers with the 6466 just dont want heaps of lag. Not sure which a/r to run

[Lithium]

On 12/07/2022 at 2:01 PM, Dan BNR said:

 

 

On 12/07/2022 at 10:06 AM, Dan BNR said:

i have a bnr34 with a forged engine i built years ago bottom end finished havnt touched the head yet. Wanting to push around 680whp on 100octane and close to 800whp on e85 in New Zealand.

i will be getting head ported may even have cnc porting. Unsure on cams duration and lift etc? 
 

looking at maybe a sinco top mount manifold unsure on gate size also? 
 

have thought about fueling yet

If I were you and were sticking with stock displacement, while wanting it to be nice and responsive while also being able to do near 500kw on pump, and 600kw area on E85 then I'd go a Sinco T4 divided manifold, 1.05a/r EFR8474 and if you're doing headwork then go the Kelford 182B (260deg, 10mm lift) cams - make sure the headwork suits high lift cams, including clearancing.   

My assumptions here are that  you're likely to be tuned on a Dynapack (virtually everyone here use hub dynos) and RBs and EFR8474s are a match made in heaven.  500kw on pump is a bit of a stretch, and the slightly shorter duration cams I've suggested won't make that any easier - but in all honesty that setup will still work very well... whichever fuel you run you'll also have the option of ramping the boost up in the higher rpm when natural torque drops off if you want it to carry power a bit better at the higher end.

I know someone with 520kw @ hubs with an EFR8474 on BP98 and various people who have gone over 600kw @ hubs also with 1.05a/r EFR8474s, and they drive insanely well - basically significantly more responsive under foot than a 6266, while making more power.

In terms of wastegate that comes down to what the minimum boost you need to run is, twin 40mm obviously is proven if you go separate wastegates - otherwise something in the 50mm area is probably a good idea.   The smaller the gate, the harder it is going to be to hold a lower boost level.  

[r32-25t]

On 12/7/2022 at 12:01 PM, Dan BNR said:

Seen a few people pushing some good numbers with the 6466 just dont want heaps of lag. Not sure which a/r to run

Those numbers are at the hubs, I’ve seen a few able to do 600kw at the hubs but none at the wheels. 
 

I’ve got a 6466 myself and on my 2.6 it was an awesome turbo. I am currently building a 2.8 and it will be going back on with a bigger rear on it and will see how it goes on that. On a 2.6 chasing the number you are I’d put a 1.0 divided rear on it 

[BK]

My 32 with the 6466

On 26/08/2021 at 9:55 PM, BK said:

R32 GTR

Nitto 2.8 stroker

Precision 6466 T4 divided 1.0 a/r

Haltech Elite 2500

BP ultimate 98 RON unleaded

456kw / 611hp at 22psi

A bit more on United E85 at 32psi

Full specs on build thread

On the other 32 we've gone the 6266 T4 with 0.84 a/r

[Dasmbo]

Just a suggestion i would 800 whp with h beam rods are taking them to about there maximum A beam rods are much stronger and rated to 1000whp which would give you a better safety margin. 

[Dan BNR]

Bare with me guys first time iv used a forum haha. Im definitely wanting to stick with a single not twins. 
Is this what you guys would recommend for a big single? T4 divided 1.06ar vband out. And of course the t51r mod 🤷‍♂️😂. Ill look into those 260 cams. 
never heard of A beam rods??? Thought H beam were the strongest?

[r32-25t]

I beams are stronger then h beams 

[BK]

Why the T51 mod ?

Anyway I beams all the way in both of our 32s, but arguably just or more important is the fasteners.

The 2.8 has ARP2000 3/8" rod bolts and 2.6 runs the highly recommended 7/16" bolts in ARP2000 which weren't a thing when we did the 2.8 on a 26 conrod (only RB30 at the time). Nitto and Spool now do 7/16" RB26 121.5mm capable conrods, so price not a concern -

ARP CA625+ 7/16" is the shit 👌

[joshuaho96]

On 7/12/2022 at 3:20 AM, Dan BNR said:

Bare with me guys first time iv used a forum haha. Im definitely wanting to stick with a single not twins. 
Is this what you guys would recommend for a big single? T4 divided 1.06ar vband out. And of course the t51r mod 🤷‍♂️😂. Ill look into those 260 cams. 
never heard of A beam rods??? Thought H beam were the strongest?

Pretty sure the T51R mod affects the compressor map and probably not in a positive way.

[Lithium]

On 12/07/2022 at 10:20 PM, Dan BNR said:

Bare with me guys first time iv used a forum haha. Im definitely wanting to stick with a single not twins. 
Is this what you guys would recommend for a big single? T4 divided 1.06ar vband out. And of course the t51r mod 🤷‍♂️😂. Ill look into those 260 cams. 

Don't think anyone has (or anyone in their right mind would) suggest going twins for this kind of situation.

The exhaust housing will very much depend on what turbo it is, not all 1.06 exhaust housings are equal - there can be a HUGE range of what they will support depending on the wheel sitting in the housing and the cross section of the volute.   In regards to the turbos being mentioned here the 1.00a/r hotside would probably be ideal for the 6466, or the 1.05 for the 8474.

Btw here is a dyno plot for a 1.05a/r EFR8474 on an RB26 with big cams and a ported head on BP98, 14psi and 21psi boost levels shown.

[Dan BNR]

As far as im aware the t51r mod doesn’t affect any performance, wanting to do this just for the sound. I had a brand new t51r spl that i got in a deal but i knew it was going to be a huge lag monster so iv sold that and now would like to try this t51 mod out. 
 

i see a few of you guys talking about rods etc. my block is complete and finished so ill be running the H beams.

 

figures i want i was supposed to say at hubs not wheels just as a round about figure. 
 

Would you guys recommend the pt6466? 
 

the 8474 in my eyes is a ugly looking turbo 🤦‍♂️😂 you may laugh at this but im pretty keen on a nice clean engine bay so id prefer to stick with something that looks kinda cool too haha but if its really worth it then ill sacrifice it.

 

pretty new to all this so i dont fully understand alot of this turbo flow rates etc and kind of teaching myself as i go. 
 

another reason i was more leaning towards a 6466 rather than a 6266 is i may look at a rb30 or 2.8 if the late future not 100% sure thoughts?

 

keep it basic Appreciate it guys

Edited July 13, 2022 by Dan BNR

[BK]

On 13/07/2022 at 2:55 PM, Dan BNR said:

Would you guys recommend the pt6466?

Didn't read my post above ? I run one and posted the results for you, so that would be a yes I recommend - will not disappoint.

[Lithium]

On 13/07/2022 at 5:25 PM, Dan BNR said:

 

Would you guys recommend the pt6466? 
 

the 8474 in my eyes is a ugly looking turbo 🤦‍♂️😂 you may laugh at this but im pretty keen on a nice clean engine bay so id prefer to stick with something that looks kinda cool too 

Never considered Precision turbos especially aesthetic lol.  The EFRs are definitely an eye sore as default but imho if you don't use the BCS, BOV (using a blank plate), internal gate and powder coat the compressor housing or something like that then they actually are one of the better looking housings but that's all additional cost on top of an already spendy turbo.

It is definitely a better unit for your needs otherwise but yeah, should have lead with the fact you are happy to compromise some performance for personal aesthetic tastes - the short answer is that until a few years ago the 6466 was the absolute best option for what you want from it now, and it's still up there... So absolutely worth it if there are other factors which make it appealing to you.   No one is going to see it as a silly choice!

[r32-25t]

Ok plain English 

put a 6466 with a divided 1.00 rear on it