Jump to content
SAU Community

Recommended Posts

Can someone tell me what valve sizes in RB26 and.......sorry SK :)

No Problems, valve details follow;

RB26 Valve Specs

--------------Head-------Stem------Length------Tip

Intake-----34.65mm----6.00mm----102.40mm----3.5mm

Exhaust----30.15mm----6.91mm----101.55mm----3.5mm

:P

I got my block last week and after removing the head gasket noticed that there was a '2' stamped on each of the pistons and next to each cylinder on the deck.  Is this an indication that the cylinders have been bored?  The hone in the cylinders is pretty good considering the engine has 200,000k on it

These numbers are grades or tolerances. Nissan has 5 grades for the RB30. I guess this is one reason for thier reliability.

  • 2 weeks later...

Dropped the RB30DET in last night.. ohhh it looks sooo damn sexy.. hopefully we can get it running tonight!!!

Im pretty excited :mad: shame I have to run it in and cant hammer it straight away :mad:

how different will the rb30det sound and how different will it be to drive?

ohhh RB30DET :(

sounds very tough. Mine is quiter than Joels rb20det on idle, but my exhaust is still very restrictive...

Driving..well very diferent. Coming from the rb20 backround its a bigger step than going from the rb25 like yourself. More torque on take off.....ie wheelspin off boost

OMG. You guys have no idea how awesome a RB30DET is. i can now drive everywhere in 5th gear unless i go under 30ks an hour.. then i gotta go down to 4th.....

I am just stoaked. this thing is unbelievable.

what max power can you get outta standard rb25det injectors with a rb30det ?

Interestingly I have seen more power than when they were in the RB25DET. I believe it is because the rpm to make that power is lower, so the injectors can be open longer. An example, if I made 225 rwkw with the RB25 it would be at say 6,250 rpm. That means there is about 5/1000th's of second for each injector to be open. But if I could make say 270 rwkw with the RB30 at 5,100 rpm, then the injector could be open for 6/1000th's of second. This 1/1000th of a second longer time open means 20% more fuel, so that's why you can get 20% more power.

Obviously engine efficiency makes a difference, but I suspect that probably adds to the advantage because a fresh (run in) RB30 is proably going to be more efficient than an RB25 with the usual K's on it.

I have only one real world experience where we got 475 bhp out of the RB30 on the engine dyno. I have never seen more than the equivalent of 390 bhp out of an RB25 with the same injectors.

That should stir up some comments I am sure. :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Thanks guys,  Yeah I should at least have them dynoed, at least then I know what I've got as a starting point.  The springs on these are hard as rocks. I vaguely remember Russman saying he was going to sell the shocks to me with the rocks fitted, as he was keeping the softer springs for his new setup.  I didn't click at the time but of course that was to let me know the shock/spring wouldn't be matched.  I also remember pricing up new springs around 2014-15, but, house, money etc. it never happened. So that was another reason to have them rebuilt. I have rebuilt the forks on many motorcycles so I think I could handle the seals on these easily enough, but getting the valving right would be a rabbit hole I cbf exploring.  Duncan, interesting to hear RP was tuning these back then. I might give them a call.  In the mean time I have been busy fitting sway bars. The Whiteline rear sway bar I purchased 15 years ago finally got fitted, along with the Whiteline front bar that showed up last week. Just waiting on new links for the front sway bar to finish that off.  And my spare set of advan AVS VS5's should be back from the powder coaters in a Pearl White finish sometime this week, with a set of Hankook RS4's lined up for fitting.  And then I just have all the suspension bushes to do. A comprehensive kit is on the way... Lots to do before the Ararat hill climb. Cheers guys 🍻   
    • Nice car! I’m glad folks in the US have gotten past the FnF and are buying real cool cars like the 260RS I was with a bunch of mates in Portland about a year ago and spotted a green Stagea (just a regular 2.5T AWD) parked about 2 blocks away and they were like “a what?” So I made a bet with them for a round of beers and said “ok one of you run down there and tell me if the steering wheel is on the correct side” 5 mins later the American comes trudging back up the hill and goes “he’s right guys. Ok what beer do you want?”
    • Should replace OR drop the tank, give it's good clean. Might be worth replacing that entire fuel level/pump/cradle thing with this: https://frenchysperformancegarage.com/products/fpg-s13-180sx-r32gtst-single-pump-hanger-kit-billet-hat-6-v3-fpg-089?gQT=2  
    • Thank you so much for the help
    • Yes it is ATF. I quote @Duncan "it takes a good synthentic auto trans fluid like Castrol Transmax Z" It's not a diff. It's a transfer case. Totally different thing. Yes, fluid will come out the sender hole. No you do not really need to drain it. Just pull the old, quickly poke the new, clean up and top up. But realistically, you should probably take the opportunity to change it anyway.
×
×
  • Create New...