Project 24

[murrayis]

After reading quiete a few threads on the Internet about stroking a rb20 to make a rb24, I decided what the hell and embarked on building one for my 32. I thought i might post up here whats going on and any problems we will run into during the build for anyone else whos been thinking of undertaking this project.

I have most the parts gathered up now with only a couple to come. When i get some pics i will post them up and keep this thread updated as new items are added &/or removed.

Current Part's:

-Eagle H-beam Rods

-ARP 2000 Rod Bolts

-Ross Forged Pistons 83mm Bore

-ACL race bearings

-RB26 Standard crank

-Tomie 1.8mm Head Gasket 83mm Bore

-ARP Head studs

-HKS 264 Cam shafts

-HKS Adjustable Cam Gears

-SARD 650cc Injectors

-Greddy Oil Cooler

-GTR Intercooler 600x100x305

-Garrett GT2876R

-Stainless Low mount manifold

-Custom Dump & front pipe

Parts to come:

-ECU

-Fuel Rail

-Plennum

To current date we have stipped down my spare engine, had it sent out to Bryants Engineering in Brisbane to be bored and honed to suit 83mm bore and acid bathed and the Eagle rods are being re-bushed to match the ROSS pistons.

I am still trying to find/decide on which ecu to go for, i am thinking of giving Adaptronic a try i have heard many good things about them and what features they have for there price. If anyone knows a store who sells and stocks a aftermarket fuel rail for the rb20 please let me know. I am still deciding to go with a off the shelf plennum or getting one made.

Any feedback would be very much welcomed & coments appreciated and i know i will get alot of why not build a rb25 or 26, but i wanted something different.

Cheers

Cameron

Edited September 12, 2007 by murrayis

[R31Nismoid]

What do you have planned to get the head flowing?

Got any quotes as yet?

[murrayis]

Currently for the head we are looking at using 1mm oversize valves if not a lil larger, heads going to be totaly ported etc to suit the other mods. A local workshop in brisbane is building it for me, no real quotes as yet, its all been worked out between the shop and I.

We are looking for 450 - 500 rwhp but I know the turbo will be the limiting factor in the equation.

[Roy]

Good qork. Only comments are i have never heard of the ECU. Power Fc, well tested, works well and wont hinder performance.

Also, the turbo...would be good on a std RB20 but think its way to small for an RB24. Especially at the power you are chasing.

Oh, ok...also. Dont bother with a fuel rail or a plenum. Throw the std gear on there and see how it goes. Match port the inlet. At least that way if you throw a plenum on it at a later date you will KNOW if its actually helping/hurting and what its benefits are. When you are undertakign something like you are i think its important to keep a few known ingredients in the mix. That way if early results are not as expected you have a fair idea where to start the fault finding

[murrayis]

Yea i know the turbo is going to be a problem, but that can always be changed down the road where i dont want to and my workshop doesnt wanted to have to pull the engine apart to change things so thats the main focus to start with.

As for the Powerfc, its still a possibility, i have read paulr33's guide of using a rb26 unit on a rb20/24 so we will see, Also looking for coils, eigther spitfire or toyota smart coils or another make, not sure as yet.

ATM my rb20 has 235rwhp on 12psi, my target is 400hp but engine should be good for a fair bit more.

Thanks for your comments guys keep them comming

[R31Nismoid]

Currently for the head we are looking at using 1mm oversize valves if not a lil larger, heads going to be totaly ported etc to suit the other mods. A local workshop in brisbane is building it for me, no real quotes as yet, its all been worked out between the shop and I.

We are looking for 450 - 500 rwhp but I know the turbo will be the limiting factor in the equation.

The turbo wont even come in pissing range of 450rwhp dude

Closer to around 300-350rwhp would be more expected

You'll need to go much larger yet!

[murrayis]

lol i know i know.. i am open to donations

[Kaomech]

Very interested in seeing the progress man... if you have any direct links to resources for the build please share them too ...

I have been considering doing this myself to my rb20 but as the cars used daily its quite impossible at this time... but id like to know how responsive it would be in low range power band... im chasing 300rwkw from my RB20 Onevia... but something unique like rb24 would give it that extra appeal.

[dead32]

yo gimme your turbo and go buy a gt30 .86

[murrayis]

lol Ryan mines already got a .86 rear housing on it

An update:

I have finished all the pipework for the new turbo setup, inc water and oil lines see pics below

[Kaomech]

hows the lag with .86??? on the RB20

[Roy]

Dont get too carried away with talk about exhaust A/R. It pays ti understand what that really is. Its only a ratio, Cross sectional area of turbine nozzle to radius of the scroll

So if you have a tuebo with a 65mm turbine, and then a turbo with a 40mm turbine. They can both have the same A/R but the larger turbine means it will have also have a larger radius. So in order to maintain that A/R value you will need a larger corss sectional area. Larger cross sectional area the better the exhaust flow, but less velocity to spin the turbine.

So you really need to consider the wheels izes in conjunction with A/R etc to decide how laggy the turbo will be

[murrayis]

Very intereting,

the turbo is this one, maybe somsone with more nderstanding could translate for the rest of us

Garrett GT2876R

As for lag on a RB20, i dont know yet only just finished the install, and been flat out at work so havn't finished making the dump pipe as of yet, one more section to go. But i will let you know when i drive it, i previously had a cheapy highmount t04e on there and came on full boost 16psi at 5100rpm

Edited April 18, 2007 by murrayis

[Jago]

how much did the pistons set you back? if you don't mind me asking

[Roy]

Also, may pay to have your block checked thoroughly. 83mm is taking a lot of meat out of the block. Some Jap stroker kits use 81, 82, 83mm.

[murrayis]

how much did the pistons set you back? if you don't mind me asking

I'm nopt sure they where part of a package deal, because the dude building had them already from a previous deal which fell through, same with a couple of the other items

[murrayis]

how much did the pistons set you back? if you don't mind me asking

If i get a chance tomorrow i will go get some pics of the block there looks like there heaps of meat on the walls

[Dale FZ1]

Only comments are i have never heard of the ECU. Power Fc, well tested, works well and wont hinder performance.

I've been checking out the Adaptronic for a while now here: http://www.adaptronic.com.au/index.php

and it seems to be a good thing. Has the sort of features found on other units costing $$$ and there is an Adaptronic community for support. Should prove to be a good thing, I believe.

PFC is already a known quantity though.

I'd second other comments about the turbo too. At that planned power level you're going to need big mass airflow = big revs + big boost. What's the planned usage for the car?

Trying to work out your thread title too - what's water got to do with it?

Edited April 18, 2007 by Dale FZ1

[Kaomech]

So the way the wheels work what kind of lag would you expect to see from an A/R .82 on a HKS 3037 or the garrett twin GT3071R ...

[murrayis]

Yes the adaptronic do look like a pretty dam good ecu for its small price tag, I am also looking at getting a Garrett GT3040R rated at 650hp.

The cars main use... hmm i havent driven it since Mid December lol so pretty much just once a week driving, odd car show maybe the odd dyno comp