Is The Rb20 Det 2.4 Liter Upgrade Worth It?

[niZmO_Man]

I heard you can use the diesel crank (RD28)

[Ben C34]

Seeing as Yoshi is planning on using a nismo clutch plate with stock pressure plate and is worried about a few hundred bucks of higher registration costs, something tells me he won't be building an engine anytime soon .

[MJTru]

Thats intresting. Rd20 I just got rid of one out of a laurel. Kml. I was woundering the same thing. But now its gone.

As for me mate i woulf do a rb26 swap the sky is the limit then. See for me after you pay to get them 3 numbers (what ever that is) lol. The 26 would be right there. So why stop. Plus I would figure just looking at videos that the race shops there have all kinds of gurus that deal with rb26 more than 25 or 20 for that matter. Funny cause I have had both motors and found that I like a 20 better than a 25 from a stock stand point. The 25 for me I broke ring landings at 24psi. Was lacking a bit of fuel tho. Who cares though. Lol. I took it to its limit to find the weakness. Next was a rb20 in a gts4 body. Same thing took it to lits limits and damaged the con rod bears on number one cylinder. These motor were all stock. And the rb20 was doing 26psi. Lacking fueling again. I feel all the failures upon wear down and looking back at the logs had nothing to do with fuel. Me personally I liked the 20 dont know why but I just do. I guess it might have been the 4wd platform.

Get a rb26 trust me. Live life with no regrets. Lol;)

[iruvyouskyrine]

But then he would regret not getting a Neo.....

[Dose Pipe Sutututu]

Seeing as Yoshi is planning on using a new nismo clutch plate with an used stock pressure plate and is worried about a few hundred bucks of higher registration costs, something tells me he won't be building an engine anytime soon .

FYP

[bcozican]

costs is up to you ....no one can tell you how much to spend and on what ... so take that out of the equation really as you are askign about performance

I know you said 2.4L but i'll give you reference using 2.2L

I've had rb20 up to 380 hp, fully built everything rb 2.2 from 400hp to 550hp (didnt last long up there) and rb25 from 450hp to 550hp

the rb22 didnt even come close to the rb25 in terms of performance with exactly the same mods - extra displacement and vct

so I either suggest keeping your rb20 and have about 360hp or go rb25

[AngryRB]

how long did the RB25 last at 450hp plus just out of interest and was it track or street?

Edited March 31, 2015 by AngryRB

[bcozican]

how long did the RB25 last at 450hp plus just out of interest and was it track or street?

Ive been through 2 rb25's in 3 years (one just recently) ... about 18 months each Id say about 20+ish events each comps and prac's. 90% of time tuned at 500hp and 550nm

Track car - 95% drift and that is literally belting the crap out of them .. hard on limiter etc etc - prob push them a little too hard

Both times = bottom end bearings went

^^ as per my build thread rb25's have a few things done to them but not forged just cleaned up and good bolt ons and is on e85

Edited March 31, 2015 by bcozican

[yoshiii335]

Thats intresting. Rd20 I just got rid of one out of a laurel. Kml. I was woundering the same thing. But now its gone.

As for me mate i woulf do a rb26 swap the sky is the limit then. See for me after you pay to get them 3 numbers (what ever that is) lol. The 26 would be right there. So why stop. Plus I would figure just looking at videos that the race shops there have all kinds of gurus that deal with rb26 more than 25 or 20 for that matter. Funny cause I have had both motors and found that I like a 20 better than a 25 from a stock stand point. The 25 for me I broke ring landings at 24psi. Was lacking a bit of fuel tho. Who cares though. Lol. I took it to its limit to find the weakness. Next was a rb20 in a gts4 body. Same thing took it to lits limits and damaged the con rod bears on number one cylinder. These motor were all stock. And the rb20 was doing 26psi. Lacking fueling again. I feel all the failures upon wear down and looking back at the logs had nothing to do with fuel. Me personally I liked the 20 dont know why but I just do. I guess it might have been the 4wd platform.

Get a rb26 trust me. Live life with no regrets. Lol;)

26 psi? Did you have it tuned? Or did you just slap a big turbo on there? stock turbo? RB25 turbo?

Hmm, 26 wouldnt be bad but the average price for them are about 2500 american dollars and up. All of the yanks are getting them and they are being sold to the states alot now, the 25 year rule for cars are in effect for the R32 GTRS now. Prices for the car have shot up here at many places.

[yoshiii335]

costs is up to you ....no one can tell you how much to spend and on what ... so take that out of the equation really as you are askign about performance

I know you said 2.4L but i'll give you reference using 2.2L

I've had rb20 up to 380 hp, fully built everything rb 2.2 from 400hp to 550hp (didnt last long up there) and rb25 from 450hp to 550hp

the rb22 didnt even come close to the rb25 in terms of performance with exactly the same mods - extra displacement and vct

so I either suggest keeping your rb20 and have about 360hp or go rb25

How did your rb20 drive and feel at those speeds? Responsive? Pig?

[XKLABA]

I think you won't do it.

Neo rb25 is better, vct is what you want.

Lol, i keep reading this but am yet to see proof

RB26 FTW

[XKLABA]

IIRC isn't the RB24 kit just a RB26 crank with 4AGZE pistons and rods ?

[Ben C34]

Lol, i keep reading this but am yet to see proof

RB26 FTW

Yeah, I just like to stir the pot ??

Trent at chequred recently tuned a neo with 26 throttle bodies on it. Was pretty sweet.

Edited April 1, 2015 by Ben C34

[Ben C34]

Half way down, would love to see the Dyno chart.

http://www.sau.com.au/forums/topic/452371-rb25det-neo-tuning-advice/#entry7500111

[yoshiii335]

I have discovered 3rd gear in my car. I have discovered how well I can build up speed before going into 4th when on the street and high way. I am learning each day how to drive and use the car. I am understanding how to use the rpms better and how the rb20 likes to rev.

I dont know what hp I am at with my current mods, but my turbo seems to be fighting hard and doing well.

I have the EVC 5 and I have it set to 13.9 as the cut off. It cuts off at the psi, but somehow if I floor it, I always hit 15.7 psi. I am wondering if I have a freak turbo or if what I am experincing is normal.

I am learning how to drive into my upper rpms without going into boost. I am hitting bost around 2.5, 6 now and whenever I hit 4000 rpm (when boosting) my car just takes off and I am holding on.

So I am wondering what it will be like with a rb 25 turbo, the EVC, and later bigger fuel pump and injectors(if I get it tuned with the rb25 turbo before I get a bigger turbo.

[yoshiii335]

IIRC isn't the RB24 kit just a RB26 crank with 4AGZE pistons and rods ?

The shop that suggested a Rb24 kit mentioned that they would use a RB26 crank.

[XKLABA]

Yeah, I just like to stir the pot

Trent at chequred recently tuned a neo with 26 throttle bodies on it. Was pretty sweet.

I've got a 26/30 that is pretty sweet, what does that prove

How much of a 26 do you need to use to catch a 26, I'd try a whole 26 next time

[XKLABA]

Half way down, would love to see the Dyno chart.

http://www.sau.com.au/forums/topic/452371-rb25det-neo-tuning-advice/#entry7500111

Me to, and a genuine list of mods cause it looks like a lot of custom work from the out side

[iruvyouskyrine]

IIRC isn't the RB24 kit just a RB26 crank with 4AGZE pistons and rods ?

yep.

[Ben C34]

I have discovered 3rd gear in my car. I have discovered how well I can build up speed before going into 4th when on the street and high way. I am learning each day how to drive and use the car. I am understanding how to use the rpms better and how the rb20 likes to rev.

I dont know what hp I am at with my current mods, but my turbo seems to be fighting hard and doing well.

I have the EVC 5 and I have it set to 13.9 as the cut off. It cuts off at the psi, but somehow if I floor it, I always hit 15.7 psi. I am wondering if I have a freak turbo or if what I am experincing is normal.

I am learning how to drive into my upper rpms without going into boost. I am hitting bost around 2.5, 6 now and whenever I hit 4000 rpm (when boosting) my car just takes off and I am holding on.

So I am wondering what it will be like with a rb 25 turbo, the EVC, and later bigger fuel pump and injectors(if I get it tuned with the rb25 turbo before I get a bigger turbo.

Hmm. Don't know what to say to that....