Rebuilding Rb25det, Suggestions?

[S1R33]

I currently have an R33 RB25DET, it looks like it has leaned out on the sixth cylinder, so rebuild is required. I am looking at rebuilding the engine with Arias forged pistons 20thou oversized & might as well get a metal head gasket at the same time.

Now at the moment i got the standard turbo running 10 pounds, front mount, 3'' turbo back exhaust with custom screamer pipe, ebc, splitfire coil packs etc. I am looking for more power when im doing the rebuild so at the moment my list is;

Rebuild with Arias Forged Pistons & Metal Head Gasket

Apexi PowerFC

Nismo 740cc injectors

Bosch 040 fuel pump

Nismo fuel pressure reg

I am undecided on the turbo though, i was looking at either the Garrett 3071R or the Garret GT30R from sliding performance but i wanted some suggestions on a turbo to get. The car is a daily driver and reasonable boost response is required. I also may get some Tomei poncams depending on the turbo but i want to use the standard manifold and have an internally wastegated turbo. I was also looking at a HKS GT-RS but due to it costing 4000 i don't think it is possible at the moment.

[GTshortie]

How much power are you chasing?

740cc injectors would be a overkill for a daily driven car (petrol) UNLESS you after 300+rwkw. 550cc should be right. remember its a 6cyl not a 4cyl like Silvias/Wrx's

for the money of HKS GT-RS the GCG Highflow (half the price) seem to be producing similar results without the price tag.

my 2cents

[S1R33]

How much power are you chasing?

740cc injectors would be a overkill for a daily driven car (petrol) UNLESS you after 300+rwkw. 550cc should be right. remember its a 6cyl not a 4cyl like Silvias/Wrx's

for the money of HKS GT-RS the GCG Highflow (half the price) seem to be producing similar results without the price tag.

my 2cents

250rwkw daily driver with the ability to boost it up to hopefully 280rwkw to 300rwkw, i want to run 12s and in darwin with the heat you need alot of power. Has anyone run a GT3071R or GT30R on an RB25 and do they know approx what it makes boost at & what it is capable of power wise. I also don't mind spending a little bit more money to get get good parts, i don't to get a turbo and run it at close to max performance all the time.

Edited September 21, 2006 by S1R33

[al_r33]

Yer im in the same process as you but my only last decision is the turbo and im leaning towards to Gt30r from Slide as its Internally gated & will bolt on to std manifold and should see around the 310rwkw with the correct motor! Anyone using a gt30r internal gated turbo?

[blind_elk]

I have some ACL 40thou forged pistons if you're interested.

[S1R33]

I have some ACL 40thou forged pistons if you're interested.

whats the difference & how much.

[S1R33]

How laggy will this turbo be, i have been told 1 bar boost at 3750rpm without cams, and if i got poncams how mcuh quicker would it spool.

Garrett GT30R 500hp T3 Internally Gated Turbo

Included :

GT30R 500 Hp Dual Ball Bearing turbo with 0.82 exhaust (optional 0.5 and 0.6 front cover) with internal wastegate

Wastegate (Adj actuator kit) with dual diaphram (reduces lag)

Wastegate housing kit

CNC Machined braket

Turbine:

84 trim 60mm GT30

Compressor:

76.2mm 56T compressor

Exhaust housings:

T3 inlet, T3 5 Bolt discharge 0.82 A/r, 3 bolt dump pipe flange

[al_r33]

I rekon it is the perfect turbo for me & it shouldnt be too lagy with cams & a good tune! So thats what im opting for! But if anyone has one on there car let me know how it performs

[Munna1]

How laggy will this turbo be, i have been told 1 bar boost at 3750rpm without cams, and if i got poncams how mcuh quicker would it spool.

Garrett GT30R 500hp T3 Internally Gated Turbo

Included :

GT30R 500 Hp Dual Ball Bearing turbo with 0.82 exhaust (optional 0.5 and 0.6 front cover) with internal wastegate

Wastegate (Adj actuator kit) with dual diaphram (reduces lag)

Wastegate housing kit

CNC Machined braket

Turbine:

84 trim 60mm GT30

Compressor:

76.2mm 56T compressor

Exhaust housings:

T3 inlet, T3 5 Bolt discharge 0.82 A/r, 3 bolt dump pipe flange

Sounds like it bolts onto the stock manifold which is good. does it come with water and oil lines? do you need a custom dump pipe?

Have you thought about the HKS PRO-S kit comes with everything needed to bolt in place 300+rwkw is possible with cams and its probably less laggy.

cheers

[Moanie]

there is also the vg30 turbo thats good for 300rwkws plus, and is meant to be a perfect match for the rb25! worth checking out maybe?

[Abo Bob]

The problem with the HKS GT2835 ProS kit is that it only comes with the 0.63 rear housing which sucks balls on an RB25. You need the 0.87 or whatever the middle one is.

[GunMetalR33]

I have a GT30 with a VG30 housing on the back of it. Not too lagy and great top end. What is the ar on the VG30 housings?

[al_r33]

the GT30r bolt onto the Stock manifold, But the Dump will need modified slightly & bradied Oil & water lines are required!

Gunmetalr33 when do you see full boost & how much power are you making?

Cheers

Alan

[GunMetalR33]

Making 255-260rwkw at 18 psi without cams. get to 18psi between 3000 and 3500 rpm...

VG30 Zaust housing ar anyone?

the GT30r bolt onto the Stock manifold, But the Dump will need modified slightly & bradied Oil & water lines are required!

Gunmetalr33 when do you see full boost & how much power are you making?

Cheers

Alan

[Moanie]

i believe the exhaust housing ar for the vg30 could be 0.82 or 0.83?

[GunMetalR33]

thanks mate!

What is the r33 rb25det zaust housing ar then??

Edited September 21, 2006 by GunMetalR33

[Moanie]

OOPS MY BAD!! I meant 0.63!!

[Moanie]

unfortunately i don't know stock!! never really looked into it! lol!

[al_r33]

i thought the ar for a rb25 was 0.63 but im probably wrong! This turbo i am geting has a 0.82 or 0.83ar

[Moanie]

i think for an rb25 with a fairly decent sized turbo, getting 0.82/83 ar is a perfect match... anything less and it won't pull so well.. anything more and you start to run into lag territory! and we all know lag is