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But you can see why a RB20 makes more power than a RB26 right?
Different engine.. :bowdown1:The bottom end becomes irrelevant when a restriction is reached in the head tho..

Why do evos make good power only being a 2.0?
Subarus also! Little 1.6 turbo Hondas...
Because the heads do the numbers... Better design etc! Rb26's heads are poor!
Bang for book your better getting decent head :) than a stroker!
 

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Different engine.. :bowdown1:The bottom end becomes irrelevant when a restriction is reached in the head tho..

Why do evos make good power only being a 2.0?
Subarus also! Little 1.6 turbo Hondas...
Because the heads do the numbers... Better design etc! Rb26's heads are poor!
Bang for book your better getting decent head :) than a stroker!
So what your saying rich is for a rb30 to produce its full potential it needs a even better flowing head so it can flow its full potential? Makes sense perhaps that's why the differences are not so big as the heads aren't great even for the 2.6 are they?
 

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Quite frankly this is getting boring now I've backed everything up what I've said comparing rb26 to the nissan rb30. So all you people keep convincing your selfs the nissan rb30 is better than the 26 but until I see facts I won't believe it.

Please people I would like to be proven wrong because we should all be able to buy the best products for our money.

Surely rips have had a tuned rb26 in dyno'd the car just removed bottom end and fitted rb30 and re dyno'd?
I will add a few comments here, there are a lot of poor builds these days people knocking up engines in their sheds, without paying attention to various clearances, poor choice of components and a poor project design to start with. There is a lot to building an engine than slapping it all together and throwing a big single, big cams and big injectors. I know there are a lot of so called experts here and even some tuners are not advanced engine builders.

I would trust someone who has built Motorsport, endurance race engines, Le mans engine, F1 engines than someone becoming a RB specialist over night and banging out 1000bhp engines, as that figure is not really that impressive when all they do is slap a bunch of ready made parts and not really knowing the relationship between them all and how it will affect performance and drivability. I am not talking about anyone specific but it a general statement from what I have observed not only on this forum but elsewhere.

As for my thoughts on the RB30, it is a poor choice, why use a low spec block and then spend tens of thousands on components to fit into it or around it? I agree with Dan, why didn't Nissan use it? Why did Nissan create an N1 block and then an RRR block if the RB30 block is suppose to be all singing dancing block to use?
 

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So what your saying rich is for a rb30 to produce its full potential it needs a even better flowing head so it can flow its full potential? Makes sense perhaps that's why the differences are not so big as the heads aren't great even for the 2.6 are they?
FFS, the penny FINALLY drops.
 

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I will add a few comments here, there are a lot of poor builds these days people knocking up engines in their sheds, without paying attention to various clearances, poor choice of components and a poor project design to start with. There is a lot to building an engine than slapping it all together and throwing a big single, big cams and big injectors. I know there are a lot of so called experts here and even some tuners are not advanced engine builders.

I would trust someone who has built Motorsport, endurance race engines, Le mans engine, F1 engines than someone becoming a RB specialist over night and banging out 1000bhp engines, as that figure is not really that impressive when all they do is slap a bunch of ready made parts and not really knowing the relationship between them all and how it will affect performance and drivability. I am not talking about anyone specific but it a general statement from what I have observed not only on this forum but elsewhere.

As for my thoughts on the RB30, it is a poor choice, why use a low spec block and then spend tens of thousands on components to fit into it or around it? I agree with Dan, why didn't Nissan use it? Why did Nissan create an N1 block and then an RRR block if the RB30 block is suppose to be all singing dancing block to use?
You would be impressed with my 1.4 vauxhall, just over 160 bhp from 2 valves
Per cylinder and reving to 8750 rpm. Homebuilt with many tricks the pro builders in my class are not using, I also have close friends in Ilmor that help with its development. I have other friends with flow benches and engine dyno's in there garages, home built engines if you have the right equipment can beat those guys who spend many thousands more with supposed "Motorsport" companies.

Why Nissan didn't use the rb30 has been covered already, a 2.6 was needed to suit the class capacity limits, it is that simple.

You still have not explained why you think the rb30 is weaker
 

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As for my thoughts on the RB30, it is a poor choice, why use a low spec block and then spend tens of thousands on components to fit into it or around it? I agree with Dan, why didn't Nissan use it? Why did Nissan create an N1 block and then an RRR block if the RB30 block is suppose to be all singing dancing block to use?
What makes the RB30 a lower spec block? It'll run as much HP as a RB26 in standard form......and by the looks of some of the high powered ones getting around, a shedload in modified form as well.
Is 1800hp not enough?
It's already been well documented as to why Nissan didn't use it, purely a CC rating for Motorsport, if you have read the history of the R32 you will know that the car was originally designed to have the RB30 in it, but was reduced to the 26 to get under the Motorsport rules.
......it does make me laugh that the people bagging RB30's have never owned one, not many on here that have are :chuckle:
 

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The 2 comparisons I posted are quite clear that rich's rb26 made Conrad's rb30 quite laughable for the money he spent on it.The 2 with gt4094s spool within 200rpm of each other.

You think I'm just slagging of the rb30 well I'm not I would like to see a massive difference between the 2 because I would be the first person saving my money up to have one built.
You are not comparing apples with apples and when you do do back to back tests with nothing changed but the bottom end the difference is very significant I assure you.

Ok, lets put it a different way for you.

If I took out the RB32 from my GTR and did nothing but swap the bottom end for Rich's RB26 bottom end, would the engine make more power and would my car be quicker/faster?

YES or NO.
 

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You would be impressed with my 1.4 vauxhall, just over 160 bhp from 2 valves
Per cylinder and reving to 8750 rpm. Homebuilt with many tricks the pro builders in my class are not using, I also have close friends in Ilmor that help with its development. I have other friends with flow benches and engine dyno's in there garages, home built engines if you have the right equipment can beat those guys who spend many thousands more with supposed "Motorsport" companies.

Why Nissan didn't use the rb30 has been covered already, a 2.6 was needed to suit the class capacity limits, it is that simple.

You still have not explained why you think the rb30 is weaker
Forget group A, they went to a 2.8 in the Z tune, their flagship and last RB built car. Maybe they should have bought a skip load of seasoned RB30 blocks from Australia and NZ and used that instead? Man Nissan seriously F**cked up there! ;)
 

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Surely rips have had a tuned rb26 in dyno'd the car just removed bottom end and fitted rb30 and re dyno'd?
We sure have many times :) and with 100s and 100s of RBs built over more than 12 years you'd have thought we'd have gone back to 26/28s a long time ago if they were better wouldn't you...............................
 

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You would be impressed with my 1.4 vauxhall, just over 160 bhp from 2 valves
Per cylinder and reving to 8750 rpm. Homebuilt with many tricks the pro builders in my class are not using, I also have close friends in Ilmor that help with its development. I have other friends with flow benches and engine dyno's in there garages, home built engines if you have the right equipment can beat those guys who spend many thousands more with supposed "Motorsport" companies.

Why Nissan didn't use the rb30 has been covered already, a 2.6 was needed to suit the class capacity limits, it is that simple.

You still have not explained why you think the rb30 is weaker
I have a friend who works work in R&D at Renault Sport in Viry, big deal, that is not the point I am making.

Yes there are lots of so called useless motorsports companies out there who will fleece you just like your average tuner. You need to chose the right person based on their intimate working knowledge of building a high performance/race capable engine knowing all the little trick they have learnt from years of experience.
 

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What absolute nonsense, granted the N1 is stronger, but the stock RB26 blocks are stronger than the Australian RB30 blocks.
Come on now, no need for the BS mate :chuckle:

How do you know?

Have you tested them against each other?

Can you show me a stock RB26 block with no liners making 1800-1900hp?

I can show you a 1800-1900hp RB that uses a factory cast RB30 block with no liners.
 

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You are not comparing apples with apples and when you do do back to back tests with nothing changed but the bottom end the difference is very significant I assure you.

Ok, lets put it a different way for you.

If I took out the RB32 from my GTR and did nothing but swap the bottom end for Rich's RB26 bottom end, would the engine make more power and would my car be quicker/faster?

YES or NO.
Do you think my eagle rods would last a run rob?
 

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Come on now, no need for the BS mate :chuckle:

How do you know?

Have you tested them against each other?

Can you show me a stock RB26 block with no liners making 1800-1900hp?

I can show you a 1800-1900hp RB30 that uses a factory cast RB30 block with no liners.
How long does a 1800 bhp RB30 need to last? I guess if you get 5 mins of 7.5 seconds at a time worth of life out of them that is you satisfied considering you only drag them :) and at 200 $ per engine its pretty going right?

If I remember right the HKS drag R33 was N1 based, I think from memory 2.8? Still the RB26 family of blocks making over 1300 bhp and doing the qtr in what mid 7's?

I am sure you must be filling up the blocks with cement or epoxy or some sort to make it stronger. ;)
 

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Do you think my eagle rods would last a run rob?
Lol, no.

Please tell your new biggest fan he's still not quite getting the point.

The complete motor he continues to refer back to for comparison WAS NOT one of mine, just the bottom end which we all agree has very little to do with the way it performs or the power it makes.

Also please let him know if someone had a blown up 26 and wanted to go with a new HKS or similar 2.8 etc, a bit of head work, cams etc a suitable single turbo and supporting mods etc that it would be no more expensive to do a forged RB30 and that the RB30 engine would in fact be the better all round performer for a daily, track, a bit of drags etc......even you, having the results you have with your 26 know this is all correct.

Over and out, far bigger fish to fry.......
 

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I am sure you must be filling up the blocks with cement or epoxy or some sort to make it stronger. ;)
6.99 @ 193mph, no block filler, no liners, stock cradle, stock crank, 1400-1500hp/10,000rpm, motor did 3 years of competition level racing, winning 2 championships and it did this time at the end of the 3 years.

https://www.youtube.com/watch?v=5nCnPghFVNY

Oh, BTW that same motor is now in a street GTR in the UK.

And yes for some of the real big power blocks we use some filler.
 

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Lol, no.

Please tell your new biggest fan he's still not quite getting the point.

The complete motor he continues to refer back to for comparison WAS NOT one of mine, just the bottom end which we all agree has very little to do with the way it performs or the power it makes.

This comments makes me think what's the point of the rb 30 all together. Most people who buy the rb30 more than likely bolt them up to the head of there 2.6 so if there's no gains there's no point.

I understand the fact that if you have a completely wrecked engine and your thinking of buying a 2.8 stroker you could build a nitto rb32 anyway although nengun are doing some excellent deals on the tomei stroker kits at the moment.
 
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