Trying to decide RB20 or RB25. Please post track times and dyno numbers....

[RB20s13coupe]

Im trying to decide wether to go with the 20 or 25 in my s13 coupe. I'm pretty sure the 20 is the best bang for the buck. I plan on doing a few mods, but keeping the bottom end stock. Im lookin for 11's or 12's in the quarter, so I would assume thats around 300- 375 wheel hp. Its not going to be a track car or a drifter or anything, just gonna terrorize the streets with it. haha. Post some numbers and mods please!

-Matt

[jrd450r]

I was in a similar delima as you but ended up going with the 25, heres why: I had originally bought everything to swap an SR20 into my 240 except for the actual motor set, then i looked more into the RB's and was kind of dissapointed of the way the a built SR20 drove in a friends car. So i looked into the RB series, the price of the rb20 immediatly caught my attention, but as I looked into it more I noticed it wasnt going to meet my expectations. So i looked on more and ruled out the RB26 due to extremly high cost. I looked more into the 25 and found that its easy to make 300rwhp and not hard to make atleast 100 more. With the 20 your about limited to 300 with bolt ons and not building the motor, im not saying you cant go over 300 on stock internals but you need to remember this motor comes from the R32 which is an older car so these motors tend to have alot more miles on them. You can get the 25 out of an R32 also, but they are also in the r33 and r34, so i would reccomend trying to find one out of the r33 since its not that old and the r34 motors are more expensive, they are the "NEO" motors with VVL, variable valve technology, kinda like v-tec. With the 25 you can look into the 12's in the 1/4 mile with bolt ons, with the rb20 its going to take more than some bolt ons to get you there that fast. So if the RB20 price is catching your eye its becuase its for a reason, in the end your better off going with the 25 IMO. Its more money upfront but less in the end.
Modified by jrd450r at 2:11 PM 2/2/2007

[Sil240]

What are you power goals??What kinda driving you gonna be doing?How much $$ you looking to spend?How much work you looking to do?

It all depends on YOUR needs and wants. And Bank account. :-)

[nissanman04]

the 20 is not a great engine for drag, looking at your situation i'd opt for the 25.

[Yellow4g63]

they are the "NEO" motors with VVT, variable valve technology, kinda like v-tec. So if the RB20 price is catching your eye its becuase its for a reason, in the end your better off going with the 25 IMO. Its more money upfront but less in the end.

VVT is not like Vtec lol. Nissans VVL is like VTEC. And costing more upfront and less later??? With the RB it's going to cost more all the time. The 20 get you in a little cheaper but mods still suck for either 20/25/26. You sound like your on a budget so I'll say go with the SR20. Parts are every are cheaper than the RB motors. If you want something different I suggest that you go looking into the Neo VVL head swap for the SR20's. Thats Vtec for you, not like that S15's either thats not "Vtec" either.

[Joe]

all RB25's came with VVT too BTW. VVL was only NEO.

[Yellow4g63]

http://www.3rdgearvtec.net/And...t.wmv

In car Neo VVL working. listen and you can hear the cross over from low cam to high cam.

[jrd450r]

VVT is not like Vtec lol. Nissans VVL is like VTEC. And costing more upfront and less later??? With the RB it's going to cost more all the time. The 20 get you in a little cheaper but mods still suck for either 20/25/26. You sound like your on a budget so I'll say go with the SR20. Parts are every are cheaper than the RB motors. If you want something different I suggest that you go looking into the Neo VVL head swap for the SR20's. Thats Vtec for you, not like that S15's either thats not "Vtec" either.

My bad with the vvt/vvl, VVL is what i ment, thats why i said it was like vtec. And the fact of the costing more up front, im saying that if he wants 300-350hp eventually, it is cheaper to achieve those numbers with the RB25 than with the RB20 since the RB20 may require bottem end work and new pistons and everything else that needs to be upgraded to handle that power. Sorry I understand it was kind of a confusing post but its true.

[Yellow4g63]

My bad with the vvt/vvl, VVL is what i ment, thats why i said it was like vtec. And the fact of the costing more up front, im saying that if he wants 300-350hp eventually, it is cheaper to achieve those numbers with the RB25 than with the RB20 since the RB20 may require bottem end work and new pistons and everything else that needs to be upgraded to handle that power. Sorry I understand it was kind of a confusing post but its true.

Miss info again. RB25DET's have the VVT which is just cam timing on the intake. VVL is more like the Honda Vtec, the cams have 3 lobes per rocker arm. Not sure why you think the RB20 can't do 300-350hp with out internal work either? My daily driver is a NX2000 with a SR20VE lol thats why I know so much about VVL.

[Yellow4g63]

VVL cam non VVL cam as in the RB20/25/26.

Ohh I should post track times. I ran a 13.7@99mph in my RB20 hatchback. Mods were 3" downpipe/nocat/3"exhaust, Filter, boost to 12psi 1st to 2nd gear then 10psi the rest of the way. 255lph pump, Stock sideheater, J30lsd and base map RB20 PFC.http://www.3rdgearvtec.net/And...k.wmv Old crappy vid. Never went back to the track after the FMIC and intakemanifold someone hit my S13 before then and I have been on the lazy path to getting my S14 running. That damn VVL NX2000 is taking up alot of my time.

[RB20s13coupe]

Well, I really dont want to jump on the band wagon and go with the SR20. I'm thinkin the RB20 because its cheap, it sounds awesome, and its different. I was plannin on gettin a set of cams, valve springs and can gears ($900-1,000) One of those ebay intake manifolds ($500), a set of used GTR 440's ($100), a tubular exhaust manifold ($150), new turbo... maybe 60-1 ($650-750), external gate ($150), ebay FMIC w/piping ($250), and a home made down pipe w/ 3" ebay exhaust ($200) I already have a 255 pump and a AFC2.... so Im not going to just bolt it in and hope for 400hp to the wheels..... Im on somewhat of a budget, but not going to sacrifice power to save a bunch of money.

I've read in the sticky posts on this thread that the RB20 will bolt up to the stock KA mounts and driveshaft? is that a typo?

[RB20s13coupe]

Yes! dude thats it Im definitely goin with the RB20, That sound is soo f'n awesome!

VVL cam non VVL cam as in the RB20/25/26.

Ohh I should post track times. I ran a 13.7@99mph in my RB20 hatchback. Mods were 3" downpipe/nocat/3"exhaust, Filter, boost to 12psi 1st to 2nd gear then 10psi the rest of the way. 255lph pump, Stock sideheater, J30lsd and base map RB20 PFC.http://www.3rdgearvtec.net/And...k.wmv Old crappy vid. Never went back to the track after the FMIC and intakemanifold someone hit my S13 before then and I have been on the lazy path to getting my S14 running. That damn VVL NX2000 is taking up alot of my time.

[Bwana]

I've read in the sticky posts on this thread that the RB20 will bolt up to the stock KA mounts and driveshaft? is that a typo?

IIRC you can use the same mounts, but requires a r32 xmember swap.

[Carl H]

as i said in another thread t3/t4 57trim + injector + z32 maf + 16-18psi = 300-350whp.

[RB20s13coupe]

Thats what I figured, just what Im lookin for! Thanks guys!

as i said in another thread t3/t4 57trim + injector + z32 maf + 16-18psi = 300-350whp.

[240z4u]

do some searching on the forum before you decide to go with a 150 exhaust manifold. They tend to crack etc..

good luck

[RB20s13coupe]

Yea I've heard that too, so I planned on welding on some supports, then wrapping it in exhaust wrap, so that will keep the temps down, and prevent cracking.

[craz4240]

Actually sometimes header wrap accelerates manifold cracking.

[Joe]

way to bring back a 5 month old thread

[Yellow4g63]

way to bring back a 5 month old thread

owned

[craz4240]

Who me???:OHeheheh

[nizmo zilvia]

Damn! It is 5 months old and read it all!!! DARN YOU!!! Oh well... good read? hehe.

[PhillyDaKid-S13]

as i said in another thread t3/t4 57trim + injector + z32 maf + 16-18psi = 300-350whp.

hmmmm......u talkin about the 20 or 25 carl?

[Rach20]

I have an rb20, I just ran track for my first time and made [email protected] that you may need to do some extra modifications if you want to be running 12 and under. I am at 16 psi right now and that may be the best i can do maybe if I try, high 12's. If you get the rb20 you could always upgrade your turbo to a rb25. It's basically bolt on, but then again they are ceramic turbos, so too much boost and they will blow up. Just like my turbo, I cannot run any higher or it will blow. I have 234hp to the wheels but I also have open end differential so when I go down the track I have one wheel spinning and thats not good. More traction is always better. I have checked many of the s13 rb20 dyno sheets and it looks like most of them are under 300hp with stock internals. But with a cam upgrade, turbo upgrade, and also injectors you could make close to 400hp. My whole motor set cost me $1,300 But then you will need a driveline, clutch, fuel pump, intercooloer and piping, possible transmission if it doesnt come with it. All in all it was totally worth it for me to get the 20 but if you have extra cash laying around then by all means do the 25. But there is some custom work involved such as transmission mounts. ~~Rach20
Modified by Rach20 at 5:04 PM 7/23/2007