Jump to content
SAU Community

Recommended Posts

Posting for a mate with an R31, he wants to know if anyone on the SAU site has done this conversion, cause he has just bought an R33 S2 GTR head to do the conversion.

He wants to know -

What power people have made and with what modifications?

What ECU did they use?

What CAMS were used (IF people have done the conversion what would they recomend also)

If anyone has used the N1 oil pump on the RB30 block?

And what size head gasket they used also?

Link to comment
https://www.sau.com.au/forums/topic/216424-whose-done-the-2630-na-conversion/
Share on other sites

  • Replies 61
  • Created
  • Last Reply

Top Posters In This Topic

Posting for a mate with an R31, he wants to know if anyone on the SAU site has done this conversion, cause he has just bought an R33 S2 GTR head to do the conversion.

He wants to know -

What power people have made and with what modifications?

What ECU did they use?

What CAMS were used (IF people have done the conversion what would they recomend also)

If anyone has used the N1 oil pump on the RB30 block?

And what size head gasket they used also?

1-Depends what mods - Nobody does a 26/30 coversion and keeps it stock.. the best of a 26/30 is extracted when modified..

2-Aftermaket seems the go with PFC being the most popular for the ability to tune and every corner store ebing able to tune one. If you do a big project.. you may aswell do it right and extract the most power out of it.. if not.. do a 25/30 and spend the diffrence on the project.

3-Stock ones will work - Modded ones will work too.. the head works as a normal RB26

4-Yes. You need a new cranck collar but an N1 pump is not essential.. Rb205det is enough..

5-Im assuming your going NA? The smallest possible and then shave the head/deck the block to up the compression ratio to something desirable..

have a look at the RB2*/30 thread in the turbo section of this forum..

  • 2 months later...

He's getting Mark at MRC to do the work.

Going to be interesting, NA screamer LOL.

Apparently an RB26 harmonic balancer is essential due to revs he's hoping to pull (7500ish).

Think he's aiming for 100 HP per litre.

lol - nothings as easy nowadays anymore

boss 'freshened' up his speedway car motor - by pulling it to bits, shaving the head 20thou (AGAIN!!!!), and then screwing it all back together (holden 253) - then tuning it BY EAR!!!!!

he now has no idea what compression he is running - its at about 15:1 on methanol

the 26 head is pretty good flow wise for a n/a - i would consider HKS step 1 or poncams to extract a decent midrange

powerfc def is a go, although you could keep the stock ecu and tune it with a safc neo and get pretty good

n1 oil pump is not needed, but if you can get your hands on one then you can be rest assured that it shouldnt cause any problems later on (a 25 turbo one should be sufficient)

an oil restrictor in the head would be a good idea aswell to keep as little oil in the head as possible (enough to lubricate everything, but not too much that at high revs everything blows into the pvc/catch can) - tomei do em and hks do aswell i think

He's getting Mark at MRC to do the work.

Going to be interesting, NA screamer LOL.

Apparently an RB26 harmonic balancer is essential due to revs he's hoping to pull (7500ish).

Think he's aiming for 100 HP per litre.

If its NA with cams.. he will be seeing more than 7500.

Make sure he Balances the bottom end.. and if knows it will be seeing more than 7500ish.. he may need new rods/shot peened

  • 3 weeks later...
Is it possible to use the turbo loom/injectors or ecu? or should i just go for the N/A ones?

A new stand alone ECU will have to be used as the air fuel ratio's, timing etc. will be completely diffrent

And why wouldnt you be able to use loom and injectors?

A new stand alone ECU will have to be used as the air fuel ratio's, timing etc. will be completely diffrent

And why wouldnt you be able to use loom and injectors?

So are turbo and non turbo looms the same?

It's a 25 turbo head, so you reckon turbo injectors will be fine on the N/A?

What do you recommend for a stand alone ecu to get? I'm not looking at spend the world for it

So are turbo and non turbo looms the same?

It's a 25 turbo head, so you reckon turbo injectors will be fine on the N/A?

What do you recommend for a stand alone ecu to get? I'm not looking at spend the world for it

RB25DET injectors are good fine for an NA application.. if you can squeeze more than 200kw out of them for a turbo application, they will be fine for a 150 odd kw NA project. You could use DE injectors if the engine has minimal mods.

ECU? How long is a piece of string? How much money are you willing to spend? What mods does the engine have? What tuners are available for you to use?

Have a search.. there are a few 25/30 threads around discussing what ECU's people can/are using. Im sure Skit or one of the other boys can shed more light on the situation than I have as to what ECU they are using.

If its a basic engine with simple mods SAFC is usually the simplest option.. these retail for $250 odd and are a basic air fuel ratio adjusting ECU's that are also cheap to tune.

Off the top of my head.. Z32 ecu's can be remapped and are also compatable with NVCS RB25 heads aswell.. this would be ok for a simple engine too.

  • 1 month later...

Heard the thing come into the blocks this arvo. Sounded like a v8 induction note or something crazy!

He got the car back. All up $16k or so for build, conversion, headers, electronics, new clutch etc.

The throttle response is mad when free reved!

Ok, it runs an adaptronic computer, MAP sensor.

25de pistons and stock rods, balanced rebuilt bottom end

12.2:1 comp ratio

ported head with stock valve train still.

Stock 5 speed still and brass button clutch.

$1000 worth of tuned length headers.

It's running 139RWKW @ 5700 at the moment, stock 26 cams are holding it back, and the rest of the exhaust.

So head needs to be machined to accept 280 deg cams with 10.8mm lift, once he save up some dough again.

The engine is so smooth at idle you could balance your loose change on it! (read needs some big cams).

Not to piss on your parade but the power seems a little low for the work done...

Being twin cam and four valve the cams shouldnt really be holding it back that much. Perhaps there is gains to be made with cam timing ajustment and more tuning?

If it has GTR heads you should be able to fit bigger than 10.8mm lift cams. 10.8mm is usually the limit for the RB20/25 heads...

I'm fairly sure you can get 11.5mm + lift to suit GTR head. This should work well with a high revving N/A motor.

It's still being run in so tune ain't aggressive.

I told him to definitely get cams, and adjustable gears too.

Wasn't a cheap exercise for him lol.

Yep 26 head is used in this one.

I'll post a couple o pics when I see him again.

im totally with Nosmo.. 140rwkw is pretty weak.. same work with less comp on a honda makes more than 150kw @ wheels with a much smaller engine..

somethings def not right there..

  • 2 weeks later...

As promised, the pics:

Enjoy

post-12712-1221993753_thumb.jpg

post-12712-1221993779_thumb.jpg

post-12712-1221993801_thumb.jpg

post-12712-1221993838_thumb.jpg

post-12712-1221993867_thumb.jpg

Drove it and the throttle response is awesome. Power drops off at 6500 though and gearbox is crap for shifting (needs an r33 one). Diff is also on the way...

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

    • For these last 7 years of ownership, I've always had to use a small scissor jack under one of the front tow hooks to raise the front just enough so my low-profile jack fits under to reach my subframe jack point. I'm beginning to get annoyed of always having to do this. Are there any lower low-profile jacks that fit under the gtr lip on a dropped car?
    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
×
×
  • Create New...