Rb26 vs Rb25

[Nissan2nr]

What are the main differences besides displacement. I heard the 26 motors are much strong internally and can take much more abuse than the 25's.

Is that true? I have heard that the rb25 is not much stronger than the sr, but the 26 is about as strong as a 2jz.

How much of this is bs.

I personally thing the 25's are just as strong as the 26's but I maybe wrong, can anyone help?

Thanx

[lofapoo]

Well, stock the 26 has two turbos as the 25 has one.

As for this bit...:

Quote »I have heard that the rb25 is not much stronger than the sr[/quote]

Tell you what. Get a magnum and shoot a SR, then shoot an RB. Tell me, do you still believe the RB is about as strong as the SR? RB is known to withstand 400HP (I'm sure it's way higher but I don't have any numbers right now) on stock internals, as the SR would need a rebuild to push 300 or so :p

[Yellow4g63]

What are the main differences besides displacement. I heard the 26 motors are much strong internally and can take much more abuse than the 25's.

Is that true? I have heard that the rb25 is not much stronger than the sr, but the 26 is about as strong as a 2jz.

How much of this is bs.

I personally thing the 25's are just as strong as the 26's but I maybe wrong, can anyone help?

Thanx

Isn't the record for 2JZ stock rods an crank 900hp? I haven't heard of any Stock RB26 goin that high. Maybe they have someone show me plz

[Nameless EJ6]

Hey, try that search button thing. :/

Yes, it's true: (RB26DETT > RB25DET) < 2JZ

[SeVa-S13]

I love my RB and all, but stock block vs. stock block, the 2JZ has us beat.

[BoostFab]

if i can recall, there were an article on Turbo Magazine a few months back illustrating a Skyline with rb26dett pushing 700+hp, with an HKS single turbo on stock bottom-end.

[Altiman94]

its all about tuning. Look at the ka24de stock bottom end running at 440-some hp

[Nameless EJ6]

its all about tuning. Look at the ka24de stock bottom end running at 440-some hp

I'm looking but having a hard time finding it.

It's not all about tuning.. if that were true, there wouldn't be such a large aftermarket of stronger/better internals to build engines with.

[NISMO_RB25]

scc had a 400hp turbo ka, but I think the guy was on his third motor. I have to agree that the 2jz is an awsome motor, but would you really want 900hp in your S13/S14?

[SeVa-S13]

... but would you really want 900hp in your S13/S14?

No. I'm scared of 300 right now.

Edit: Here's that sick KA. It's not just stock bottom end, it's a stock long block, with 115k miles. No cams, no headwork, no rebuild, just a good tune and a nicely matched turbo.

[NISMO_RB25]

that is pretty impressive for that motor. on second thought 400hp in just about anything is impressive

[Porschephile]

if i can recall, there were an article on Turbo Magazine a few months back illustrating a Skyline with rb26dett pushing 700+hp, with an HKS single turbo on stock bottom-end.

It was a stock R33 gtr w/ a T51R SPL. It made 710rwhp and 529rwtq.

The rb26 is much stronger than the 25, but the 2jz is stronger over all. Why try and push the "stock block" barrier and risk blowing up expensive stuff? To me, personally, I find that to be a little idiotic. 2jz, rb26, etc they are all expensive engines. I'd rather build it right the first time and know I can handle the power, rather than playing Russian roulette with a boost controller and large turbo to figure out how much power blows your engine! IMO, the people that do that are just cheap b@stards!

[PalmerWMD]

We have a lot of empricial input here to get a good sense of how much boost is safe with a given type of Mod(s).

Fred..

[dareo]

Please confirm or deny the RB25DET's weak pistons thing. I've read multiple places that the RB25DET can break pistons, ring lands i think, very easily. (like 300-400hp range) but replace the pistons and its good for a shload of HP.

RB26 has a better valvetrain, higher redline and possibly more advantages im leaving out here.

[NISMO_RB25]

Please confirm or deny the RB25DET's weak pistons thing. I've read multiple places that the RB25DET can break pistons, ring lands i think, very easily. (like 300-400hp range) but replace the pistons and its good for a shload of HP.

.

Here is an easy answer to that question. Search under fito:

He made 587HP @ 26psi on stock internals with his RB25 before breaking the rings.

That is more HP then I will ever need. At this point the only reason I would go RB26 is if I decide to go crazy and actually do AWD. I might even go AWD with the 25 and just use the 26 transmission. I haven't seen that done yet.

[Yellow4g63]

Here is an easy answer to that question. Search under fito:

He made 587HP @ 26psi on stock internals with his RB25 before breaking the rings.

That is more HP then I will ever need. At this point the only reason I would go RB26 is if I decide to go crazy and actually do AWD. I might even go AWD with the 25 and just use the 26 transmission. I haven't seen that done yet.

Didn't he break them cause of over boosting on pump gas vs C16?

[Siddhartha]

Ummmm, the SR can be taken to over 400 safely on pump gas and stock internals....

[NISMO_RB25]

Didn't he break them cause of over boosting on pump gas vs C16?

I am not sure, but it alteast proves that nearly 600 was achieved on stock internals with an RB25. That should be enought for most people, unless they are trying to build a dyno queen.

[eh?]

Fito did not realize the rb25 CR was 9:1. I'm sure if he knew he wouldn't have used pump gas DOH.JMS already did 601rwhp so there should be no question about the RB25's stock strength. This talk about the 25 not being about to handle 400hp is nonsense.

[Yellow4g63]

Fito did not realize the rb25 CR was 9:1. I'm sure if he knew he wouldn't have used pump gas DOH.JMS already did 601rwhp so there should be no question about the RB25's stock strength. This talk about the 25 not being about to handle 400hp is nonsense.

Yeah thats what I was thinking too.