RB FAQ

[eh?]

Originally Posted by 951's 330i

Whats a good, almost direct turbo? See that some people say there are turbos that are direct bolt ons but then right after say will need some fitment issues resolved? I see most people using the HKS GT2530 turbo.

Is this a straight bolt on with this turbo? Is the lag really bad? Or should i look for another turbo instead?

Thanks all

gt2530? lag? on an rb? a little ass gt2530? Who the heck is using that?

[951's 330i]

Originally Posted by eh?

gt2530? lag? on an rb? a little ass gt2530? Who the heck is using that?

Saw it on skyaustrailia or skyline usa i think i forget, followed the link from here lol

[951's 330i]

By the way i forgot to mention i know nothing about the turbos lol

[eh?]

The hks website says the 2530 is good for 320ps which would be about the same as a stock rb25 turbo.
I wouldn't waste money on a direct replacement, you can probably find a cheaper turbo and have a new DP made for less than one of those.

[951's 330i]

Originally Posted by eh?

The hks website says the 2530 is good for 320ps which would be about the same as a stock rb25 turbo.
I wouldn't waste money on a direct replacement, you can probably find a cheaper turbo and have a new DP made for less than one of those.

Like say through turbonetics or just keep searching for one?

[eklips3]

i have a friend who runs a hks gt2535 on his Rb25 . there are no fitment issues , it bolts on just fine ( make sure you get the T3 Flange version because there is a T2 flange gt2535 as well ) all you have to do is modify the oil return line i believe. really easy just a few fittings and a steel braided line. otherwise the coolant lines bolt right up. if anything cut the lines a few inches from the banjo fitting and fit a rubber line.

the lag ? what lag ? haha . that turbo for responsiveness is crazy, once you hammer the gas you get instant response. the turbo is really good for low end to mid range power but once you get to the top end it lacks a little.

but all in all my buddy put down 340whp with that turbo and tuned with Power FC on 16psi

[eklips3]

Originally Posted by eh?

The hks website says the 2530 is good for 320ps which would be about the same as a stock rb25 turbo.
I wouldn't waste money on a direct replacement, you can probably find a cheaper turbo and have a new DP made for less than one of those.

Stock Rb25 turbo can only put out 280whp on safe boost range ( around 12psi)

[951's 330i]

Originally Posted by eklips3

i have a friend who runs a hks gt2535 on his Rb25 . there are no fitment issues , it bolts on just fine ( make sure you get the T3 Flange version because there is a T2 flange gt2535 as well ) all you have to do is modify the oil return line i believe. really easy just a few fittings and a steel braided line. otherwise the coolant lines bolt right up. if anything cut the lines a few inches from the banjo fitting and fit a rubber line.

the lag ? what lag ? haha . that turbo for responsiveness is crazy, once you hammer the gas you get instant response. the turbo is really good for low end to mid range power but once you get to the top end it lacks a little.

but all in all my buddy put down 340whp with that turbo and tuned with Power FC on 16psi

Is that with stock internals? Or injectors changed as well? Thanks for the info. I want to acheive 400whp. But i know i will need help on deciding on what i need to get. AS of right now, according to what the last owner said, its making around 230 to the wheels on stock turbo with stock internals, FMIC, Apexi SAFC and Apexi EBC. I think the psi was at .90 bar for the dyno run but yea

[951's 330i]

And what about the T-series turbo from Turbonetics? See im not to sure on how to tell what turbo is bigger then the one on it right now. Like all i can tell between their turbos is like what they say

For EX. T-series is rated at 450-1000hp while the 60 series is rated at 300-750. Thats the only way i can tell between the turbos and im sure those numbers are mainly acheived through tunning and supporting mods.

[eklips3]

his motor had forged internals,tomei headgasket, stock head, 750cc injectors , Power FC , thats it in a nutshell though.

a good condition Rb25 can still achieve the same numbers though, its just the amount of a beating it can take ... which is alot with stock internals with good compression.

about Turbo's from turbonetics i really dont know anything about that but if you research on how to understand Turbo A/R's then you can find just what your looking for.

go here ----> TurboByGarrett.com - Turbo Tech101 educate yourself and you will have a much better understanding with what you want.

[GSXRJJordan]

Originally Posted by eh?

gt2530? lag? on an rb? a little ass gt2530? Who the heck is using that?

Seriously, that's what I thought when I read that. That's like a GT28R lol.

Lag isn't even an issue with a GT3071!

Originally Posted by eklips3

Stock Rb25 turbo can only put out 280whp on safe boost range ( around 12psi)

With stock cams/intake manifold I believe that number is accurate - with some more modifications, I think (read: hope) the stock turbo can do 300whp, hopefully I'll be able to show that soon.

[eh?]

Originally Posted by eklips3

Stock Rb25 turbo can only put out 280whp on safe boost range ( around 12psi)

which is around 320PS . Though I've seen RB25 turbo's do more than 300whp/10psi with a standalone.

951's 330i And what about the T-series turbo from Turbonetics? See im not to sure on how to tell what turbo is bigger then the one on it right now. Like all i can tell between their turbos is like what they say

For EX. T-series is rated at 450-1000hp while the 60 series is rated at 300-750. Thats the only way i can tell between the turbos and im sure those numbers are mainly acheived through tunning and supporting mods.

A GT3076 will suit you fine or even a 50 trim garrett t3/t4 .

[johngriff]

From everything I have talked to steve about lag in the GT3X series of turbos, it all seems to be ignition related.

Steve is one of the best Ignition tuners I know, and response, drivability and tq results are always reflective of that.

Anyways, everything he has ever said is he can tune out ALL lag in those turbo and make them ultra responsive. I think people who complain that their GT3X series, ESPECIALLY ON AN RB, is laggy, probably has a S*** tune. That is the only thing I can think of, especially after seeing steve turn out car after car with a GT3X series and gobs of response.

So yeah, if you bolt up a GT3X series with an AFC, its going to suck.. lol

[GSXRJJordan]

Originally Posted by johngriff

From everything I have talked to steve about lag in the GT3X series of turbos, it all seems to be ignition related.

Steve is one of the best Ignition tuners I know, and response, drivability and tq results are always reflective of that.

Anyways, everything he has ever said is he can tune out ALL lag in those turbo and make them ultra responsive. I think people who complain that their GT3X series, ESPECIALLY ON AN RB, is laggy, probably has a S*** tune. That is the only thing I can think of, especially after seeing steve turn out car after car with a GT3X series and gobs of response.

So yeah, if you bolt up a GT3X series with an AFC, its going to suck.. lol

I'm having Luke (BLU808) make me a twin-scroll mani some time after SEMA, and will be bolting up a GT3582 and having Steve tune it, because his skills are legit as f*ck - his SR response was nice with 'blowzilla', and unbelievable with the GT3071.

[deep in silvia]

*Rb Plugs Are The Same As 300zx Na Plugs

*NA Z32 clutch works with DET flywheel

Kagren/ O riles Parts numbers
*power steering belt #Gates k030334
*Alternator Belt: Gates K040335
*A/C Belt: Gates K040378

*The RB25 has Side feed injectors, there for you can use the SR injectors on a RB25

*Z32 fuel filter (for the fuel pumps higher flow)

*Starter NAPA part number RAY2444514

[Sideways_blksr20]

Hello guys
I just finished my rb20 swap Into my s13 an starts right away the only problem is that the idle neve goes down even after thecar gets warm
any help would be appr iated thanks

[eklips3]

Originally Posted by Sideways_blksr20

Hello guys
I just finished my rb20 swap Into my s13 an starts right away the only problem is that the idle neve goes down even after thecar gets warm
any help would be appr iated thanks

adjust your idle air control valve , tighten it to lower rpms , loosen it to raise rpms .

if that dosent work then it might be your air regulator.

[Sideways_blksr20]

Air regulator is that the maf ?

[Sideways_blksr20]

I tried to look for the idle screw and I can't find it .

[eklips3]

no not the maf. you can find the air regulator by following the vacuum hose that comes off the charge pipe where the blow off valve is , its a pretty think hose , you cant miss it. you follow it and right by the fuel rail there is a sensor that the thick hose runs to. that my friend is the air regulator.

and for the idle air control valve , its on the top back of the intake manifold. it has a brown clip. the adjuster screw is right there

[Sideways_blksr20]

yeah but my concern is that the idle doesnt change even when the car is warm,and if i adjust the idle screw i am afraid that it wont start after.

[Sideways_blksr20]

Originally Posted by eklips3

no not the maf. you can find the air regulator by following the vacuum hose that comes off the charge pipe where the blow off valve is , its a pretty think hose , you cant miss it. you follow it and right by the fuel rail there is a sensor that the thick hose runs to. that my friend is the air regulator.

and for the idle air control valve , its on the top back of the intake manifold. it has a brown clip. the adjuster screw is right there

my rb20 didnt come with a blow off i think because it came from a cefiro

[Sideways_blksr20]

ok i found the idle screw and i tighten all the way ,the idle went down a bit but still high .

how do i fix the air regulator?thanks

[eklips3]

Originally Posted by Sideways_blksr20

ok i found the idle screw and i tighten all the way ,the idle went down a bit but still high .

how do i fix the air regulator?thanks

replace it with a new one. and i dont know what your getting at with the blow off ... all RB20 came with a blow off .. in fact all turbo motors do. i was getting at the vacuum pipe thats beside the blow off valve.

what you can try actually is using sea foam on your intake manifold. sea foam did wonders for my car , made it run sooo smooth. just might get your idle issue.

[eh?]

Adjust your tps to spec. See the FSM.
See if you have a vacuum leak too.
Also make sure your air regulator is getting power.

[Sideways_blksr20]

I solved the problem .i was missing a little spring inside the acc .thanks guys

[eklips3]

nice , good job my friend

[repda916]

what would be a good first upgrade for a Stock rb20?
Alos can i use Sr inner cooling pipping and radiator or no?

[eklips3]

Originally Posted by repda916

what would be a good first upgrade for a Stock rb20?
Alos can i use Sr inner cooling pipping and radiator or no?

rb25 turbo , front mount intercooler , full exhaust and boost controller.

SR intercooler piping does not work , you need custom intercooler piping if you have S chassis car. if you have skyline it comes in a kit from greddy . and for the SR radiator no it does not work , you need a rad that has the outlet and inlet on the passenger side of the car if your car is USDM.

[ProjNightshade]

I saw earlier in the thread that the S1 MAF is the same as J30, but what if you have an S2 RB? what us maf can I use?