Top RB20 Club... do you have over 260rwkw?

[Roy]

LOL...you wont go near maxing out 550cc injectors. Unless the thing had a GT30 compressor wheel when it was rebuilt.

Also external gates are cool, but dont mean more power per say, it can if there is a large restriction in the exhaust housing, it can help with stable boost, so can perhaps stop psi from trailing off at high rpm.

[Chris32]

LOL...you wont go near maxing out 550cc injectors. Unless the thing had a GT30 compressor wheel when it was rebuilt.  

Also external gates are cool, but dont mean more power per say, it can if there is a large restriction in the exhaust housing, it can help with stable boost, so can perhaps stop psi from trailing off at high rpm.

Yeah, I don't reckon you'd need more than 550cc injectors on a stockish RB20

I have seen somewhere on the net a RB20, bored and stroked to 2.4L, with a Greddy T88-33D turbo, making near 700PS. It was used in a RWD slick equiped R32 drag car, from memory it ran low 10's. That used 720cc injectors I think, but I may be mistaken

550cc injectors would be the go for a RB20 if you want to make over 280rwkw, up to that I reckon the GTR 440's should be fine. No need for over 700cc injectors unless you are chasing 600+ HP I reckon

[dangerous_daveo]

Id even say 550s are too big for whats still a street car... My mate has a 1GGTE (2L 6cyl twin cam turbo) he has whats pretty much a t66 on there now, and 550cc injectors which might hit 40% duty cycle on a good day, the thing has about 350rwhp. Different engine, but not that much different.

[pitchd]

we'll see when we get it and get the td06 on... 280kw is the aim with that turbo... 550 fc injectors for budget then go for some 740's later on just to leave room incase i wanna upgrade

- adz

[Cubes]

If you go for the larger injectors spend the money on a set of Nismo injectors as they have multiple pintles to ensure the fuel is atomized correctly.

[Wazz]

i wanted to 1jz my s13.. but its to much ****ing around so the RB IT IS rb20det s13.. 180-190rwkw stock boost exhaust pod filter.. and rb25 turbo

fmic is goin on soon along with a new clutch(mine just shit itself)

[RNS11Z]

Adpsi - r32 from bris made 380rwhp recently on pump fuel 20+psi. Built motor how ever

[Sydneykid]

I was talking to a friend in Japan last week about RB20's and he was at a HKS drag meet last year where an RB20 powered R32GTST did a 9.9 at 139 mph on radials. It was a 2.4 litre with a T51 ball bearing turbo, not drastically lightened, road registered of course. Punch those numbers into the drag calculator and it says 575 to 600 bhp. That's pretty damn impressive.

PS; he has pictures and will find out which workshop it was from.

[rbs13]

Adpsi - r32 from bris made 380rwhp recently on pump fuel 20+psi. Built motor how ever

what turbo is he running? i heard it was an apexi but not totally sure?

[Roy]

Hey Chris, or any other 2530/RB20 owners, can you guys post up the rwkw figures at the following rpm ranges:)

Sydneykid - RB25 High Flow

rwkw-rpm

180 7,750

190 7,500

200 7,250

225 7,000

200 6,500

175 6,000

160 5,500

154 5,250

150 5,000

145 4,750

142 4,500

Average Power (4,750rpm to 7,750rpm) - 178rwkw

Roy - TD06-20G , 10cm

rwkw-rpm

165 7,750

175 7,500

180 7,250

195 7,000

205 6,500

209 6,000

222 5,500

216 5,250

198 5,000

174 4,750

132 4,500

Boost comes on strong at 4,500rpm, hits 17psi at 4,700rpm (approx)

Average Power (4,750rpm to 7,750rpm) - 193rwkw

I guessed the last few power figures ie 7,7500 & 7,750rpm so could bve a little less:(

Just trying to get a feel for how they hit boost/drive. Obviously a drive of each others cars woudl highlight strengths/weaknesses...sadly thats not really going to happen.

[jnr32r]

This is mine from March last year, this is with a HKS 2535 @ 18psi. AFR between 11.4 - 12.0

will attempt GTR cams again in a few weeks and then another tune. we'll see what happens...

rwkw-rpm

175 7,250

184 7,000

200 6,500

208 6,000

200 5,500

192 5,250

188 5,000

182 4,750

175 4,500

Average Power (4,750rpm to 7,250rpm) - 191rwkw

[dangerous_daveo]

Im noticing a comon thing, everyone says the RB20 love revs, but after 6000rpm they die off. Is this because of the cams correct?

Also if its not toooo hard is it posible for everyone to post boost at all those levels, or even just where boost starts, hits on hard, and full boost please?

[Roy]

Edited my earlier post. Yeh RB20s love to rev based on the mechanics/dynamics of the engine based on the stroked, piston/rod weight etc etc.

The airflow, cams etc means that whilst they can rev hard, they do lose some top end power

And thise 2535 results look good, i would of perhaps expected a bit more in the way of peak power aroud 5,750-6,000rpm though?

[Ahh32]

Well i am finally going to rebuild my engine properly. RB2?. will either be a 23 or 24 depends if i can find some RB26 bits in time or not.

will be using tomei pistons and 1.0mm head gasket.

hi-flowed RB25 turbo (SK comments convinced me)

Going for 240-260rwkws

Date of start is the 01 of March, this year

ohh ditching my four puck for a carbon clutch too.

any suggestions or tips.

IS there a good tuner to re-map the stock ecu in QLD. my guy pissed off up north.

P.S> i have everything else to support my power levels.

[DRFT32]

hey guys

got a question about a power figure.....

RB20DET

Bottom End

balanced crank

weight matched rods and pistons

Arias 20 thou oversize pistons

all new bearings

Top End

all new valves 1mm oversize

ported and polished head

polished exhaust manifold

match ported manifolds

adjustable cam gears

rest of car

FMIC

3" zorst turbo back

Rebuild VG30 turbo

sard adjustable fuel reg

GTR fuel pump

k and n flat panel with CAI

ecu re-chip

1 BAR of boost

and has anyone does these sort of mods on their RB20 ??

if so what rwkw did you get

i am about 2 weeks away from that list on my 32

[Cubes]

My tip would be to pick up an R32 RB25DE head use turbo valve springs and check the valve seat tension, R32 RB25DE bottom end (r33det if you want the oil squirters) forged pistons and rebuild that.

Possibly even use the GTR Rods and crank in that? 2.6ltr maybe 87mm pistons to bring it out close to 2.7ltrs.

Work out the price for both and decide.

The reason for the R32 RB25DE head is that you are able to use all the stock Rb20DET bits and bolt it on. You will only need the R32 RB25DE inlet manifold (which looks exactly the same as the RB20DET one but internally is larger). Bolt the rb20det plenum on the inlet manifold, use the rb20det center coil cover and you will have a motor that looks identical to a RB20DET.

Unless the head is pulled off the new hybrid rb25 there is no way you can tell it is a 2.5 or 2.6ltr depending on the crank and rods you use.

And remember, when you purchase a new block it has no engine number on it.

[Ahh32]

1. i had a RB25de in it before. swapped it.

2. i don't want a RB25 or 25/30

3. RB24 will go harder sound better and cause i just wanna.

4. i am not a big fan of sheep

[dangerous_daveo]

1. i had a RB25de in it before. swapped it.

2. i don't want a RB25 or 25/30

3. RB24 will go harder sound better and cause i just wanna.

4. i am not a big fan of sheep

You gota admit tho a nice peice of lamb with a nice sauce on it isnt too bad!

[Cubes]

any suggestions or tips.

You asked I replied....

Why do you worry about being a sheep?

The motor will be more reliable make more power everywhere, the turbo will be pumping cooler air as less boost does = cooler a charge.

If you know how to read compressor maps you will know exactly what I am talking about.

The Rb25 head over the rb20 head requires some where around 5-6psi less boost for the same or similiar airflow.

lol... It makes me laugh when people think doing some thing should be ignored because it would be considered sheepish.

Who cares.

When I built up the RB30 it wasn't to be 'Different' it was because it gave me the driveability characteristics that I wanted, lots of mid range and the potential for awesome top end with a decent set of cams.

The RB20 even with another 300cc's really doesn't float my boat, but then again, I could keep telling my self 'its different' when i'm waiting for that 250rwkw turbo to spool up hit hard and break in to uncontrollable wheelspin at 5000rpm.

As I said.. You asked for a suggestions.

No need to get all cowish over it.

[Roy]

The RB20 even with another 300cc's really doesn't float my boat, but then again, I could keep telling my self 'its different' when i'm waiting for that 250rwkw turbo to spool up hit hard and break in to uncontrollable wheelspin at 5000rpm.

Im bringing my car over the first wek of Feb, fingers crossed with a re-tune and new exhaust ill be pushing out close to 240-250rwkws:) Maybe we dont need the 300cc, but hopefully we dont have wild wheelspin either:)...and fingers crossed it lives and the old $600 RB20 provides plenty of fun:)