Jump to content
SAU Community

Na Rb26/30 Built .....help Need

docaam

By docaam,
in Engines & Forced Induction

 Share

Recommended Posts

docaam Rookie

docaam

Posted
  • Author
Posted

I'm running 25DE pistons that have been shaved, also had the block shaved and the head leveled I think from memory. When it was all said and done the compression ratio was over 12:1 which is so border line having to run race fuel (something higher than 98 - 100 octane at least anyway) that on a hot day here in Australia it would ping. I now run a 1.8mm steel multi layer drag style head gasket which has brought the compression just under 12:1.

I have spent almost 9 months in Dubai and it's not just hot, it's F**KING HOT!!! So here are a few little things that I see that might be a drama from the time that I have owned my 26/30, the carbs while they would make any RB lover moist in the crutch hearing them at 8000rpm+ probably aren't going to work very well with the humidity and the temperature that is in Dubai even when it get's 'cold' (less hot), you will also need someone that knows how to tune carbs and knows skyline motors well, because if something goes wrong it's going to go wrong in a big way, believe me and it gets expensive after a while.

Not trying to put a downer on anything, all the power to you for making a wicked N/a motor, I just don't think it's going to work very well where you are unfortunately.

Hey Silhouette in which engine you were running these DE pistons?

Finally just got rid of my RB25DET motor and starting this next month. For anyone below is one of the features done on my car

http://www.crankandpiston.com/on-the-road/1972-datsun-s30-rb-z-al-ain-uae/

Coming to the thread and I honestly appreciate the inputs from the guys both in favor and against this, its just this project is now a powerplant project.

After checking with people here for the carbs it was advised to leave it for the time being built the engine run it on ITBs (stock 26 or aftermarket) and then do carbs at later stage once engine is all done and running.

Now again two options and need some option and feedback, I am sorry to ask so many questions but not that good in these technicalities

Option 1

Rb26 or RB26/30

Positive points:

Better engine, higher redline and comes with ITBs so less fabrication.

I have mixed feedback, some guys said better just take a 26 engine and just change the piston remove the turbo and run it. Is it doable? got quotes from Nitto and JE they can make custom pistons to increase the compression to 10.5/11. Should I be looking to change anything else in the engine to convert from TT to NA?

Can add a RB30 block better stroke but revving will be lower/

Option 2

Rb25DE head (neo or non neo) with RB 30 Block

Positive points:

Cheaper to set it up (cost 550$ for both engines), compression might be better.

Only thing needed here might be aftermarket ITBs or RB26 ITBs custom fit on this. Only thing saw people going against is that it revs low and 26 head is better then 25

So whats the suggestion guys for both the options? if changing pistons and rods in option 1 can make it run fine then I am more inclined towards it

docaam Rookie

docaam

Posted
  • Author
Posted

Out of luck I went roaming in the scrap yeard to see if by any chance they have some those rare ones RB26DE and found this

RB2530.jpg
image.jpg

Engine came from Japan and was told a fresh import, Seems like series one RB25 head mated to RB30 block very rare to see that done in Japan.

Major upgraded parts I can see were:

Tmoei Cams and Cam gear

Longtube aftermarket headers (huge not sure will fit in S30)

Very neatly done wiring and hooked up on HKS Fcon along with ECU

Greddy intake manifold and a bigger throttlebody

Auto gearbox

Couldn't check anything else but seems like a neat unit there, guy was asking 2500$ for it which is tempting and might come down a bit without intake manifold and gearbox and maybe headers.

Will it be a good idea just to use this and install ITBs/Carbs on it?

  • 7 years later...

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      But first....while I was there, I also swapped across the centre console box for the other style where the AV inputs don't intrude into the (very limited !) space.  Part# was 96926-4GA0A, 284H3-4GA0B, 284H3-4GA0A. (I've already swapped the top 12v socket for a USB bulkhead in this pic, it fit the hole without modification:) Comparison of the 2: Basically to do the console you need to remove the DS and PS side console trim (they slide up and back, held in by clips only) Then remove the back half of the console top trim with the cupholders, pops up, all clips again but be careful at the front as it is pretty flimsy. Then slide the shifter boot down, remove the spring clip, loose it forever somewhere in the car the pull the shift knob off. Remove the tiny plastic piece on DS near "P" and use something thin and long (most screwdrivers won't fit) to push down the interlock and put the shifter down in D for space. There is one screw at the front, then the shifter surround and ashtray lift up. There are 3 or 4 plugs underneath and it is off. Next is the rear cover of the centre console; you need to open the console lid, pop off the trim covering the lid hinge and undo the 2rd screw from the driver's side (the rest all need to come out later so you can do them all now and remove the lid) Then the rear cover unclips (6 clips), start at the top with a trim tool pulling backwards. Once it is off there are 2 screws facing rearwards to remove (need a short phillips for these) and you are done with the rear of the console. There are 4 plugs at the A/V box to unclip Then there are 2 screws at the front of the console, and 2 clips (pull up and back) and the console will come out.
×
×
  • Create New...