Turbo Questions

[al_r33]

Hey guys,

I am interested in up grading my turbo! I know there is allot of skyline running round with these GT30r or the GT35r! I’m a big fan of this turbo but allot of people I have talked to that have them there not hitting boost until like 4800rpm and in a gtst you only basically have till 7000rpm! I want a turbo smaller than this that is capable of making 300rwkw if I want but something that will come on boost earlier and chop a skyline with a gt30r!

Any suggestions or info would be appreciated

Cheers

[carl h]

gt30r is teh win on the rb20, just add some cams and an agressive timing map and you can get spool earlier than 5k.

i need to add more fuel on spool up so it spools faster but man when it hits it hits hard and goes to 8 like no other.

[Cubes]

I was under the impression you lean and retard to get a turbo spooling slightly quicker?

Lean + retard = higher egt's.

[al_r33]

Well anyway i dont have an rb20 iv got a rb25 my thing is just f*cked! id prefer something else rahter than a Gt30r!

Any suggestions on somthing better?

cheers

[Cubes]

Grab a VG30 or similiar sized turbine housing, machine it up to suit a GT30 -12 CHRA with a .6 comp cover. + a set of cams and you will get very very close to 300rwkw. That should come on hard just before 4k.

The only way to really drop spool times more is to drop the head on a rb30 block.

[al_r33]

yer that sounds good! but how would this compare to a rb25 with a gt30r side by side obvoulsly the gt30r is capable of more horses but i want somthin that comes on boost earlier and will beat a rb25 with a gt30r!

[al_r33]

anyone?

[TTT]

I personally think that what you're requesting is stupid.

quick option - NOS

the only way to spin up a big turbo quickly is to have more exhaust gases.

to do this, apart from Nitrous, you need more capacity.

Sure cams will help and timing and tuning and the hey and the hoe..

but using a 3L bottom end as discussed in the 137 page thread up there (points to the top of the forum), you will be able to spin up this turbo with ease.

but you don't seem to have a proper goal in mind.

you jump from 300rwkw to beating an RB25 with the same turbo to having no lag..

so there's probably no helping ya..

Edited September 7, 2005 by GTST

[paulr33]

how much money do you have and what mods do you currently have

[thommo]

sounds like you really only want this for bragging rights over a mate.

you're gonna need more than just a big turbo if you want 300kw, check out the dyno results thread

[Dee 33]

Mate you're asking for more power with less lag.

The whole issue with more power and bigger turbos is that you get MORE lag. It's the payoff. You can't have both.

If there was a turbo that had more power and less lag then why would anyone even bother with a GT30R?

[al_r33]

the current mods i have are turbo back 3.5inch exhaust, fmic, avcr, Gtr fuel pump and a fully rebuilt engine with forged internals could go into detail about the rebuild but wont and my 555cc and pfc are on the way! yer i just want a good turbo and come's on boost early and produce round the 300rwkw! price is not an issue!

Edited September 7, 2005 by al_r33

[paulr33]

price not an issue?

ok do an rb30 bottom end

change and 740cc injectors

change to gt35r

get a suitable external wastegate

get a suitable manifold

4" exhaust

get some suspension work done probably a complete whileline works kit

get some 265 tyres or semi slicks

change to 040 fuel pump

probably want to look at fuel rail too

youll need a bigger airflow meter probably q45

your clutch will get fried as well so change clutch

probably want a good cold air intake with such a larger amount of air coming into the system

dont rev to 7000rpm with the rb30 bottom end more realistic would be 6000rpm as it wont make any more power and will have issues with the harmonic balancer

i am by no means an expert (far from it actually) so you would be better to speak to a tuner and work out a realistic goal

[predator]

you want everything...

if price is not an issue.. run a twin turbo setup

[Cubes]

Twinscrew.. lol

What you are asking is impossible.

[discopotato03]

Actually there is a couple of options in the GT30 turbine based range , just maybe not common or cheap .

There is a version of the HKS GT3037 which has a 52 trim compressor rather than the 56 trim comp version which is the same as the GT30R . The 52 trim version comes with a .50 ARR non port shrouded comp cover (housing) instead of the 56 trims .60ARR port shrouded comp cover .

52 trim CHRA no 700177-0006 , turbo no 700382-0009 or -0010

56 trim CHRA no 700177-0007 , turbo no 700382-0011 or -0012

Second option is the propper GT30 turbine version of the GT3071R CHRA no

700177-0023 . This uses the 56 trim GT35 71.1mm comp and has the same compressor flow capacity as the 48 trim version of the HKS GT3037 but with higher efficiency and less innertia to accelerate . The GT37 compressors in 3037's (48/52/56T) and GT30R (56T) are 76mm .

So two options , the 3037 52 trim and the GT3071R generally use the same type of comp cover so appear the same externally .

Your call , cheers A .

Edited September 7, 2005 by discopotato03