Rb30 Conversion

[SLAPS]

RB30 can be done with stock bits for 3k. - PM sent.

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a garrett gt30/40 with .82 external gate exhausting housing, cubes uses the same turb on his rb25/30 i think but is interl gate

No Cubes uses the 6bladed .6 port shrouded GT3076 .82 IW.

The GT3040's are good but they are a tad lazy. The power delivery feels like it lags a bit then comes on with a rush. The 76 however is linear and much more tractable.

The larger 82mm compressor paired with the GT30 .82 rear doesn't offer any more power compared to the GT3076 unless your running better than 98ron pump fuel. The hot side becomes a restriction.

Or.. GT3040 with the 1.06 rear can push close to 340-350rwkw on pump fuel with cams etc. BUT with the additional lag you may as well drop on the GT35r .82 and push just that little bit more. Where does it end.

Back in the day when the GT3076 was a 7blade (not current 6blade) the GT3040 was definitely the way to go. Hell even the Gt3071 was a better option than the GT3076 7blade variant.

[SkyHi_33]

pm replied, thanks heaps!

seriously though, unless you have access to internal & external micrometers, plasti-gauge, torque wrenches, etc or understand the importance of sequences, preparation for initial fire up and absolute cleanliness.......don't even think about assembling your own motor.

I do have a variety of tools on my disposal and as mentioned before have helped with rebuilds so i know what is required, its gonna be harder doing it myeslf i know, but we all gotta start somewhere. As far as machining and balancing etc. is concerned, that is the only part where i will have to pay a professional as I wouldn't want to attempt it myself.

After all the reason for starting this thread is seeing who here has done it so in case i do get stuck i have a bit of reference and first hand experience to help me through it. And it helps others who are thinking of going down the same path and i know there are a few on here.

[mr_rbman]

Rb30det is a great choice, u wont regret it.

[SkyHi_33]

I hope not

Now its a waiting game till someone comes round and buys my bike so i can fund this.

Pricing up forged rods and pistons I've found cheapest prices to be around $1200 + piston rings. Not sure on brand of rods (from US) but acl pistons...

Acl race bearings rod and main just under $200

Sucks its a long weekend so cant ring up anyone else but that's what i got so far. Decent prices?

Edited April 12, 2009 by tx3_90

[ovrtym33]

I hope not

Now its a waiting game till someone comes round and buys my bike so i can fund this.

Pricing up forged rods and pistons I've found cheapest prices to be around $1200 + piston rings. Not sure on brand of rods (from US) but acl pistons...

Acl race bearings rod and main just under $200

Sucks its a long weekend so cant ring up anyone else but that's what i got so far. Decent prices?

in the latest fats fours and roataries mag there is a rb25/30 build up feature part1

[cruzin33]

No need for forged pistons and rods if your only aiming for 250kw to 300kw

[Mowbuss]

better safe then sorry though. Why go to all the trouble of building a motor, then cut corners on things like that and have pistons asplode on ya. BOOM

[cruzin33]

True, but his Budget is $2,500 - $3,000 a rb30 bottom end can take 500-600hp with a stock bottom end.

[SLED]

No need for forged pistons and rods if your only aiming for 250kw to 300kw

agree on the rods.......disagree on the pistons

detonation even at 200kw can kill stock ring lands.......then again, severe detonation can kill forgies as well

[Krishy]

all this talk on here now makes me wanna rebuild my dud 25 with a 25/30 setup....the bottom end is gone so should be able to slap on a 30 bottom and as long as other things are fine should be a decent setup.....but i believe that there is more to that than it being as easy as 123

[cruzin33]

Good info

http://users.tpg.com.au/cobra30/twincam.htm

[Madaz]

http://users.tpg.com.au/cobra30/twincam.htm

http://www.ripsltd.com/index2.html

RB30 Stock internal bottom ends start at NZD$4,000 rwd or $5,000 4wd (suit up to 600hp and 7200 rpm)

$4000nzd = 3,243.59 AUD and shipping fron NZ is about 400-450

EDIT

http://www.skylinesaustralia.com/forums/R3...ion-t15420.html

bottom of first post has a download

Good info

http://users.tpg.com.au/cobra30/twincam.htm

3rd post 1st link

[SkyHi_33]

Yeah it is possible to achieve 600hp with a stock bottom end but id rather do it safely and reliably, do it once and do it right. If there is a slight balance issue when pushing those figures, I'm certain a forged bottom end would be able to compensate much better.

As far as forged rods are concerned, I've contacted this guy over e-mail and he told me he sells em on ebay. Here is a link for those who are interested... http://cgi.ebay.com.au/ws/eBayISAPI.dll?Vi...em=400023741957

Not a bad deal bit I've never heard of that brand, claims that they're good for 1000hp at 10,000rpm with upgraded rod bolts.

all this talk on here now makes me wanna rebuild my dud 25 with a 25/30 setup....the bottom end is gone so should be able to slap on a 30 bottom and as long as other things are fine should be a decent setup.....but i believe that there is more to that than it being as easy as 123

do it its not that easy, but have a good read through the links Steve put up.. pretty much everything you need to know is covered.

Edited April 13, 2009 by tx3_90

[Damo_R34]

600hp is ~450kw, but i guess its better to be safe than sorry. If you get a reputable workshop to do the balancing, i dare say there wouldn't be any balance issues?

[scandyflick]

rb30s have balance issues. get a decent harmonic balancer ($$$, but dont skimp), have the rotating assembly (crank, fly) balanced by a pro shop, and enjoy.

[Luke_ENR34]

I'll be going a ATI Harmonic balancer. Apparently good for 1000hp

[SkyHi_33]

600hp is ~450kw, but i guess its better to be safe than sorry. If you get a reputable workshop to do the balancing, i dare say there wouldn't be any balance issues?

450kw at the engine... take around 18% power loss through drivetrain and you're at roughly 370kw at the wheels which is still fairly safe for my application in theory. As mentioned rb30's tend to have a balance issues so that's another thing where money is gonna be an issue.

I'll be going a ATI Harmonic balancer. Apparently good for 1000hp

Do you know how much these usually retail at? Ive had a look on their website but no pricing for import motors.

[scandyflick]

try searching for a local car, vl.

[Madaz]

Try 600hp atw

[Luke_ENR34]

Have a look at this thread and Pm the organiser. http://www.skylinesaustralia.com/forums/Ac...html&hl=ati

He was saying on the last page he has a local supplier to get them from now, but never again at the prices in the thread. Also note u may need to remove your A/C.

I'm currently getting 044 fuel pumps off him with no drama's so far.