Project 24

[Roy]

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 ...

I would say it wont start to really pull until 5,200rpm. Because thats a large turbo for a 2L dont be afraid to go smaller on the exhaust side. Remember it has a large turbine wheel.

For instance i run about a 0.73 exhaust housing on my turbo and my wheel is a bit smaller. My setup is a bit of a fluke in that it works so well. So with a GT30 based turbine i would happily use a housing in the 0.6X range for the little RB20. The i would expect it to really pull at about 4,500-4,650rpm provided it is tuned and set up well.

[Kaomech]

Thanks for the help Roy i get ya now .63 would prob be the best option for it then i think 5k is a bit too laggy... lol 4-4.6k revs is ok but any more than that its kinda waiting too long fora street car/drift.

[murrayis]

Hey guys,

Just got the pics of the block after coming back from being machined out to 83mm Bore

Walls are still pretty thick so there doesnt look like any worries there. We are waiting for the Eagle rods to come back from being bushed to suit the 20mm pin, once they come back we can mock it up and check the compression, Most likely we will have to send the clock away again to be decked.

I have been also looking at paulr33 powerfc mod to use as the ecu for the build.

Cheers

Cameron

[murrayis]

The rods just arrived back from getting new bushes to suit the 20mm pin.

[zertek]

this is exciting for me!!! i just stuffed my rb20det... either warped head or the head gasket blew.... or what ever else could be the cause of my 3rd cylinder to be full of coolant. So im trying to decide to rebuild it to rb24 or get a 30det.....

Cant wait to see the results!!!

[murrayis]

Thats not good to hear dude, Rb30 will be very torque happy, rb24 is different thats why i went that path

The bottom end should be together in the next fortnight, so i will post some pics up when thats done, to date total cost of the engine is around the $6000 mark with ecu, plenum, fuel rail to come.

I have just fitted the new exhaust system to the car Greddy PEII cat back stainless system

Edited May 22, 2007 by murrayis

[zertek]

hmm... well i already have a jun copy plenum, wolf ecu etc.... so just curious. how much has the engine build alone cost you not including the other bits and peices like the ecu & plenum etc.

[murrayis]

Its hard to say how much its all cost as this project has been going since december, so i will try list the parts

Pistons $1500

Rods $750

HKS cams $880

HKS Cam G $320

N1 Oil pump $430

N1 W pump $350

Block-Head $400

Valves $1100

ARP Head $130

ARC bearings $170

Injectors $660

RB26 Crank $450

Tomie gasket $350

Rod rebush $321

Machining $360

Est Total without labour $8171.00

There just the rough prices of all the items to give you an idea of the build so far to date

Edited May 20, 2007 by murrayis

[skylinegtts]

what was the part number for the N1 water pump? is this the part number for the Rb20

thanks heaps

[zertek]

FAAAAAAAAAAAAAAAAAAAAAAR OUUUUUUUUUUT!!! THATS A BIT OF DOLLARS.... not even including the turbo? geeez loise... i didnt think i was lookin at that much... my power goal is in the low 300kw at wheels braket

[Rolls]

I guess you don't have to spend that much but if you want to do it once do it properly and have it reliable then big bucks it is.

[zertek]

yea... ill do as much as i can... my budget isnt as big as id like it to be though. this is a great thread, cant wait to see the power figures

[murrayis]

Not sure on the part numbers for the water pump as i havent seen it yet, and yea might as well do it properly the first time, because it will cost more if you blow a rod and have to start from the block up again.

[zertek]

true. I've started saving. I'll get what ever i can work out to be cheaper at the time out of either converting my 20 to a 24 or build a 30det... id be happy with either

Keep the updates coming... very interested in results!

[murrayis]

Well just an Update.

Engine progress has slowed down atm because we are waiting for rings for the pistons to arrive from Melbourne, Also getting some ACL race bearings.

But I am also looking at selling my turbo setup as its not going to be anywhere need large enough for the engine build, If anyone is interested it consists of

Garrett 2876R .86 Rear

Low mount manifold modded to suit this turbo

Custom Dump pipe

Braided oil feed line

Speedflow connections

Oil drain, Water feed and return lines

I am looking for between $2000 - $2200 for the lot in Brisbane

On another front i got a lil bored on the queens birthday weekend so i made myself a new guage setup, its a lil rough but doesnt matter as its goign to be covered when the interior gets done.

[STATUS]

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.

i have seen (turbo CRX) and heard quite a few good things about the adaptronic (as a budget alternative) too, i may try to get hold on one to have a play with. Let me know how you go.

[murrayis]

No problems, I know a few skylines up here my tuner has done and they run very nice and still get 450 - 500 k's to a tank with mild mods eg turbo, boost, cams, etc

[Arkhaeon]

Ive driven an RB24DET (stupidly expensive tomei RB24), and it definitely still feels like an RB20 to drive. Even with only 230rwkw (maxxing the turbo), it is still a nugget below 4000 (due to RB20-ness, not turbo lag). Rev limiter is set to 9000, but runs out of puff by 7500.

Im interested to see how this one drives. After spending $20,000 on his setup, my mate says he would have been much happier with stock RB25 with some basic bolt-ons.

[Oblivion]

i am thinking about doing this conversion, will be interested to hear how it goes.

[murrayis]

An update, Started designing a plenum for the engine, drew it up in cad and its currently at the laser cutters being cut out of 4mm alloy

Making it out of 4inch tube and some cut to size plate, pretty simple yet hopefully should be effective