Rb2530 Turbo Choice (again)

[Ruthr33]

Hey peoples, I'll keep it simple

Got a rb25 t67 kinugawa 18psi bp98

Made 350hp at hubs.

Took it to the track and had a drift. I lived my dream.

The car is sitting in the garage and there's a rb30 block next to it.

I've only driven it once it was nice.

I'm gonna put the rb30 in there now cause I like spinning spanners.

What I'm after is less lag and more wheel spin.

It's just for the street now and I want an animal.

I'm looking at Garrett gt3076 .82

I'm not after hp, just spinning tyres.

What about gtx range? Or .63

[Ke55pig]

Keep the t67 with a 30 bottom end it will be even more responsive.

I know my rb25 t67 all it does is spin wheels with basic 235 tyres

1 5000 on wheelspin

2 4500

3 4200

Thats jist footflat no clutching t67 are very agressive although i also made another 100 hp at 17 psi 450hp

[WMDC35]

As above really, power seems low, mine also makes 100+ more hp at 18 on 98e10.(10cm non antisurge)

Shouldn't be too laggy, anyway just 30 it with the T67

[Ke55pig]

T67 i consider slightly laggy but they make upfor it i have full boost about 4200 4000 in 3rd and 4th and as soon as tgat happens it just spins up

[hypergear]

T67 is restrictive on the turbine side. For a 3L you are better off going for a GT3582 or equivalent, alternatively the 25G comp with TD06H turbine inside 10 CM housing.

[Dose Pipe Sutututu]

I would go with something similar to a GTX3582 with a 1.06 housing.. that 3.0L will spool anything with a VCT head.

Look at 2JZ-GTE with VVT-i heads.. it will give you a good idea, those motors will happily spool up a GTX3582 1.06 rear around 4k rpm and produce very linear torque and linear power.

A T67 would be too small.

[Dose Pipe Sutututu]

oo yez.. found the dyno sheet i was talkng about:

E85, stock cams, stock many thing, 25psi on a 2JZ.. so a RB30/25 would be "close".

[Ke55pig]

Surely a t67 isnt to small for a 2530 they 3076s on 2530s

How many rpm sooner does a rb30 come on to a 25 ???

[Ruthr33]

From what I've read they spool 500rpm earlier on 3l.

So with the setup I have that would be a big enprovment.

Boosting 5000 1st 4500 second and 4200 third is like mine.

I think 3582 on 3l will be too much. I'm not after a drag car with peak power.

The way I'm looking at it is I made 350hp at the wheels with 2.5 and t67. If I were to up th cc to 3l and run a smaller turbo gt3076 .82, I could easily make 350hp but I'll be boosting at 3800 4000 in first. Am I on the rite track?

[Ke55pig]

1st in all cars are laggy but her wen are u ever in 1st i personally would keep the t67 the added torque and response from the 30 should get u what ure looking for

[Dale FZ1]

T67 is restrictive on the turbine side. For a 3L you are better off going for a GT3582 or equivalent, alternatively the 25G comp with TD06H turbine inside 10 CM housing.

Listen to Stao on this one.

I am running a TDO6H-25G 12cm on 30DET for track-only.

Had been running a GT3076 0.87 turbo.

Turbine restriction showed itself when tuning with the GT30, although it was a very sweet combination for road-only use. With Garrett I would go with a GT35 0.82

The TDO6H 12cm provides great linear delivery for track, but some stage I'm interested to slip on a 10cm housing. With that I'd expect 3-500rpm earlier for full boost, say 2900rpm for 17psi. The 12cm housing for road-only might not be the ideal match if you need mumbo in the 2000-3000rpm range. 12cm is more than adequate for response across 3500-7000 on track though.

For the money would also look closely at a BW 7670 especially if finances don't stretch to a proper split pulse with twin gates, fancy manifold etc.

[Ke55pig]

He is building it for the street and wants really gd response.

[Ke55pig]

My t67 comes on at 4100 in 4th on a 25 but makes peek power at 7800 at a flat 17 across the board .

My understanding was that it would come on around 3600 on 30 and behave well on the st.

This kinda annoys me as i had planned to use this settup eg put a 30 bottom end on.

Michelomore made 400 on a 2530 with a gtx3076 .8 i beleive

[tridentt150v]

The 3076 with a .82 housing is fine for a 25 but I'd be looking at a 1.06 on it if it was on a 30. But a 3582 is better all round imo.

[Dale FZ1]

It's all application dependent for what is best suited.

^^ Fully agree the GT3582 is more suited to the 3 litre than a GT30. Those 1.06 housings aren't so easy to acquire, and the bulkier housing impinges into the centre bearing area making hookup to oil/water lines more difficult.

Cheapest option by far is to run the existing TD06SDL2-25G (aka T67 25G)and see if he likes it. Dimensions suggest broadly similar capabilities to a GTX3076.

30DET with stock cams, VCT working, stock inlet manifold etc will belt out some decent mid range torque but tend to peak around/just under 6000rpm. Bigger turbine does not automatically equate to peaky or laggy performance. But it can extend the usable upper rpm without making it gutless right down low. That's why the TDO6H 10cm turbine spec was suggested. I would back it as a very good all rounder, with the 12cm more suited to track. There's enough in-car video in my 33 build thread to demonstrate that unit as progressive, not focused on peak power.

350rwhp was a figure mentioned earlier. If the preference is for Kinugawa product and that sort of hp and very quick/early spool to fry rubber, try a TDO6SL2-20G. Not big $$ to play around and trial. I reckon it would fall over with engine rpm, maybe 5500. I'd suggest similar in sizing and characteristics to a GT3071.

The BW 7670 shouldn't be ignored. Robust, priced competitively, and different specs available to tailor it to application.

Edited November 17, 2015 by Dale FZ1

[Ke55pig]

The t67 25g seemes to preform between the 3076 and the 3582.

Really depend on were he wants the power band sounds like down low for the street

[iruvyouskyrine]

25/30neo stock head stock cams, Hypergear SS2 .82 rear, E85.

340kw on 16psi with huge midrange is very very quick.

[Dose Pipe Sutututu]

The t67 25g seemes to preform between the 3076 and the 3582.

Really depend on were he wants the power band sounds like down low for the street

not sure if you noticed the above dyno graph I posted of a GTX3582 on a 3.0L 2JZ

but it's all in at 3500rpm with 25psi and look at the power delivery, also if you were to run a little less boost it would come on even earlier.

[Ke55pig]

2jz do seem to come on boost a bit sooner but that is gd response either way

[Ke55pig]

U got dyno sheet iruvuskyline ?